Blitzy: Apache Kafka 4.2.0-SNAPSHOT Static Security Vulnerability Audit (Audit-Only, 26 Artifacts, Zero Code Changes)#1
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Add the foundational Audit-Only rule compliance evidence document for the Apache Kafka security audit. The file documents how a reviewer verifies - using standard git commands - that the audit produced zero modifications to any pre-existing Kafka source, tests, build configuration, documentation, or inline comments. Sections: 1. Document Banner with verbatim governing rule quote 2. Verification Procedure (Mermaid flowchart, neutral theme) 3. Reviewer Commands (pre-audit SHA, full diff, automated awk check) 4. Comprehensive Exclusion Assertions across all Kafka modules 5. Evidence of Read-Only Access (tool inventory) 6. Signed Attestation template 7. Corrective action on verification failure 8. Rule Traceback across 24 sibling audit artifacts 9. Closing Note The expected-output block in Section 3.2 self-validates: awk-parsed against the document's own listing, every line passes the A-status and docs/security-audit/ path predicates. The flowchart uses the specified hex palette (#16A34A green, #DC2626 red, #2563EB blue).
Adds docs/security-audit/dependency-inventory.md - a read-only, citation-only inventory of every runtime-affecting dependency declared in gradle/dependencies.gradle as of the Kafka 4.2.0-SNAPSHOT audit snapshot. Contents: - Section 1: Document banner confirming read-only scope per Audit-Only rule - Section 2: Verified Source tables with line-by-line citations to gradle/dependencies.gradle for 13 version declarations and 5 library coordinate declarations; includes transparent note on Scala literal appearing at line 26 (not line 29, which is the consumption site) - Section 3: Runtime Dependency Inventory with Mermaid classification diagram (9 subgraphs) and 13-row inventory table cross-referenced to findings 02-10 - Section 4: Dependencies Not Listed (intentional runtime-focus scope) - Section 5: Supply-Chain Attack Surface Narrative (Native / OAuth / Web Transport / Deserialization / Logging / PKIX / Language) - Section 6: Already-Configured Tooling (OWASP Dependency Check 12.1.8, Trivy, LICENSE-binary, NOTICE-binary) - read-only citation - Section 7: Future-State Review Cadence recommendations (NOT applied) - Section 8: Version Pinning Verification Checklist (reviewer checklist) - Section 9: Closing Note with cross-references to findings/, accepted-mitigations.md, no-change-verification.md Constraints honored: - Apache License 2.0 comment header (lines 1-18) - Zero emojis (verified via non-ASCII character scan) - Zero placeholders (no TODO/FIXME/XXX/TBD) - Every version matches gradle/dependencies.gradle verbatim - No existing file modified (Audit-Only rule compliance) - No dependency upgrade, pinning change, or manifest edit proposed
…ive-security controls Adds the positive-security posture artifact that catalogs every existing mitigation surfaced during the Apache Kafka 4.2.0-SNAPSHOT security audit. The document is the counterweight to the 10 findings files — it enumerates 19 code-verified mitigations so they are not re-reported as vulnerabilities and are protected from future regression. Contents: - Apache License 2.0 header - Document banner explaining the three purposes (avoid re-reporting, prevent regression, supply reviewer rationale) - Cross-subsystem Mitigation Map Mermaid diagram (19 mitigations x 19 threat classes) with green=mitigation, blue=threat legend - 19 mitigation entries organized into 11 subsystems (Tokens, OAuth, Config Providers, Compression, Networking, Authorization, KRaft, Controller, Connect REST, Config Types, Default Security Posture) each with: Source file:line, Threat Defended, Mechanism, Why Effective, Regression Risk, and Cross-references to findings/, diagrams/, and severity-matrix.md - 14 Regression-Guard Principles protecting the invariants - Validation Checklist - Navigation links to README, severity-matrix, remediation-roadmap, no-change-verification All 19 mitigations are code-grounded with verified file:line citations against the current repository snapshot (DelegationToken MessageDigest. isEqual, BrokerJwtValidator DISALLOW_NONE, DirectoryConfigProvider allowed.paths, EnvVarConfigProvider allowlist.pattern, ZstdCompression 16 KB bounded chunk, SocketServer REPLICATION listener exemption, StandardAuthorizerData DENY-over-ALLOW, copy-on-write AclCache, literal-pattern-only matching, AuthorizerNotReadyException gate, VoterSet.hasOverlappingMajority, QuorumState durable-before-memory, CLUSTER_AUTHORIZATION_FAILED propagation, AclControlManager MAX_RECORDS_PER_USER_OP BoundedList, Connect CORS empty-string default, Password.HIDDEN masking, allow.everyone.if.no.acl.found secure default, unclean.leader.election.enable secure default, DelegationToken.toString HMAC placeholder). Per the Audit Only user rule, this change adds NEW documentation under docs/security-audit/ only — ZERO modifications to existing Kafka source code, comments, tests, build files, or documentation.
Add docs/security-audit/references.md as the canonical lookup index for all file-path citations across the security-audit deliverables (findings, diagrams, accepted mitigations, severity matrix, and executive summary). The bibliography is organized into 22 sections grouped by Kafka subsystem (clients, core/broker, storage internals, server-common, server, connect, raft, metadata, streams, storage-api, coordinator, tools, trogdor, release tooling) and includes: - Path-accuracy verifications for key symbols whose canonical locations differ from informal references (BrokerJwtValidator, SafeObjectInputStream, ConnectionQuotas, ClientRequestQuotaManager, MirrorMaker Checkpoint, Streams OffsetCheckpoint, RecordRedactor) - One-line relevance description per file tying it to the relevant finding(s) and/or accepted mitigation(s) - Section 21 reverse-lookup table from vulnerability category back to contributing source files (all ten categories in canonical order) - Section 17 cataloging read-only test-file evidence for mitigation invariants - Cross-references to sibling audit artifacts (README.md, accepted-mitigations.md, dependency-inventory.md, no-change-verification.md) This is a pure documentation addition. No source code, tests, build configuration, or existing documentation is modified. The Audit Only rule is honored (verified via git diff --name-status). Artifact: 837 lines, 51,339 bytes, pure ASCII, zero emojis.
Adds docs/security-audit/remediation-roadmap.md cataloging future-state recommendations for every finding in the audit, organized into Immediate (operator configuration only), Short-Term (documentation-only), Medium-Term (non-breaking KIP-scale changes), and Long-Term (architectural) phases. Consistent with the Audit Only rule, zero code changes were applied in this run. All recommendations are phrased in future-state language (consider / may / could) and require formal engineering review (e.g., a KIP) before any implementation. Artifacts: - Apache License 2.0 header - Prominent AUDIT ONLY banner declaring no changes applied - Mermaid Gantt chart (Remediation Roadmap - Future State) with legend - Phase-organized action list for 10 vulnerability categories * 3.1 Immediate (7 operator hardening items) * 3.2 Short-Term (6 documentation-only items) * 3.3 Medium-Term (6 KIP-scale non-breaking items) * 3.4 Long-Term (6 architectural items) - Section 4: 13 accepted-mitigation reinforcement items - Section 5: Mermaid quadrantChart (Severity vs Implementation Cost) with quadrant legend - Section 6: Reviewer checklist (7 items) - Section 7: Cross-references to all sibling audit artifacts - Section 8: Governing-rules recap citing the Audit Only, Visual Architecture Documentation, and Executive Presentation user rules Every recommendation cites a finding ID (01.1 - 10.9) from severity-matrix.md and at least one absolute repository file path. No emojis. No imperative verbs in recommendation text.
Adds docs/security-audit/severity-matrix.md - the single at-a-glance drill-down artifact for the static security audit of Apache Kafka 4.2.0-SNAPSHOT. Contents: - Four-tier severity taxonomy (Critical / High / Medium / Low) - Mermaid pie chart of finding distribution (0 Critical, 5 High, 21 Medium, 27 Low) - Master severity table with 53 rows across the 10 user-specified vulnerability categories, each citing the corresponding per-category finding file under ./findings/ - Category x severity cross-reference matrix - Calibration note explaining why no Critical findings surfaced - Drill-down navigation with links to every artifact in the docs/security-audit/ tree Governing rule: Audit-Only. This commit introduces only a new documentation file under docs/security-audit/ and modifies no existing code, tests, build config, or comments. Every row in the matrix describes an observed state, not a proposed change. Related artifacts: - docs/security-audit/findings/01 through 10 (per-category findings) - docs/security-audit/accepted-mitigations.md - docs/security-audit/remediation-roadmap.md - docs/security-audit/no-change-verification.md
Adds the top-level navigation index for the docs/security-audit/ subtree that a reviewer lands on when entering the audit artifacts. Contents: - Apache License 2.0 header (HTML comment) - Audit scope: 10 vulnerability categories in verbatim user order - Kafka version and dependency snapshot cross-referenced to gradle/dependencies.gradle (Jackson 2.19.0, Jose4j 0.9.6, Jetty 12.0.22, Jersey 3.1.10, Log4j2 2.25.1, zstd-jni 1.5.6-10, snappy-java 1.1.10.7, lz4-java 1.8.0, RocksDB 10.1.3, Bouncy Castle bcpkix 1.80, Scala 2.13.17, Gradle 9.1.0) - Methodology: static code reconnaissance, finding structure, severity tiers - Governing rules: Audit Only, Visual Architecture Documentation, and Executive Presentation reproduced verbatim (perofrmace typo preserved) - Navigation map with working relative links to all 24 audit artifacts (10 findings, 7 diagrams, 6 core documents, 1 executive HTML) - How to Read a Finding template explanation (9 sections) - Terminology glossary (10 canonical terms) - Audit snapshot metadata block (HEAD 8a99096, date 2026-04-18) - Compliance verification recipe (git diff one-liner) No changes to existing Kafka code per the Audit Only rule.
Create docs/security-audit/executive-summary.html — a 22-slide reveal.js 5.1.0
presentation for non-technical leadership summarizing the Kafka 4.2
security vulnerability assessment.
Slide inventory (22 slides, all with visual elements per user rule):
1. Title (fa-shield-halved)
2. Scope statement (icon grid)
3. Methodology (Mermaid flowchart + legend)
4. Ten categories (5x2 HTML grid with Font Awesome icons)
5. Threat model (Mermaid flowchart, trust boundaries)
6. Attack surface (Mermaid category x module matrix)
7. Severity heatmap (color-coded HTML table)
8. High findings (icon cards with citations)
9. Connect REST (Mermaid sequence, INTERNAL_REQUEST_MATCHERS bypass)
10. OAuth JWT (Mermaid flowchart, DISALLOW_NONE vs alg:none)
11. KRaft quorum (Mermaid stateDiagram-v2)
12. Authz flow (Mermaid flowchart, DENY-over-ALLOW)
13. Native compress (Mermaid component, BufferSupplier + zstd-jni)
14. Deserialization (Mermaid flowchart, Jackson feature flags)
15. ReDoS surface (Mermaid mindmap, 10 Pattern.compile sites)
16. Mitigations (icon cards M1-M5 accepted mitigations)
17. Watchlist (compact table, insecure-by-default matrix)
18. Supply chain (dependency version table)
19. Roadmap (Mermaid Gantt chart, future-state only)
20. No-change verify (git diff --name-status evidence)
21. Onboarding (Mermaid flowchart, 6-step flow)
22. References (link-button grid to findings and diagrams)
Technical stack (CDN-loaded, no build dependencies):
- reveal.js 5.1.0 (league theme, dark professional)
- Mermaid 11.4.0 (neutral theme, 12 diagrams with descriptive titles
and legends per Visual Architecture Documentation rule)
- Font Awesome 6.6.0 (professional SVG icons, zero emojis per
Executive Presentation rule)
Key features:
- 'Audit Only' banner states 'no code modifications' on every slide
- Every slide has at least one visual element (Mermaid, icon, table)
- Every finding slide cites exact source file:line ranges
- Slide 19 (remediation) explicitly marked future-state only
- Slide 20 visually confirms zero git differential outside
docs/security-audit/ tree
Complies with user rules:
- Audit Only: no existing code modified; HTML artifact introduces
only new file under docs/security-audit/
- Visual Architecture Documentation: all diagrams are Mermaid with
descriptive titles and legends; current-state view only because
audit modifies no architecture
- Executive Presentation: reveal.js HTML deck with professional
icons (not emojis); covers what was done, why, risks, mitigations,
onboarding, and continued development
Citations verified against repository HEAD:
- DelegationToken.java (MessageDigest.isEqual)
- BrokerJwtValidator.java (DISALLOW_NONE)
- JaasBasicAuthFilter.java (INTERNAL_REQUEST_MATCHERS)
- StandardAuthorizerData.java (DENY-over-ALLOW precedence)
- release.py (shell=True release tooling)
- gradle/dependencies.gradle (Jackson 2.19.0, Jose4j 0.9.6,
Jetty 12.0.22, zstd-jni 1.5.6-10, and more)
Adds docs/security-audit/diagrams/threat-model-overview.md — the top-level Mermaid data-flow diagram for the Kafka 4.2 security audit. The diagram partitions Kafka into three trust zones (external-untrusted, semi-trusted operator, trusted cluster core) plus an external OAuth/OIDC identity zone, and encodes three edge styles (solid transport, dashed trust-boundary, dotted plugin/extension) with a descriptive legend. Content: - Apache License 2.0 header - Primary Mermaid flowchart LR with 3 subgraphs (Untrusted=5, Operator=4, Trusted=6 nodes) + external OIDC provider, 20 transport edges, 2 plugin extension edges, 3 trust-boundary overlay edges - Standalone Mermaid legend + plain-text marker table - Key Observations section covering KRaft-only posture, three trust zones, REPLICATION listener exemption, operator-plane semi-trust, OIDC boundary, and voter-set reconfiguration safety - Sources citing SocketServer.scala (ConnectionQuotas at L1285-L1487), KafkaRaftClient, QuorumState, VoterSet, StandardAuthorizerData, RestServer, PluginClassLoader, DelegatingClassLoader, MirrorMakerConfig, BrokerJwtValidator (DISALLOW_NONE at L52), ClientJwtValidator - Cross-references to all 6 sibling diagrams plus accepted-mitigations and the audit README Per the Audit Only user rule, this file is new documentation under docs/security-audit/; no existing code, tests, build config, comments, or runtime behavior is modified. Per the Visual Architecture Documentation rule, the diagram has a descriptive title and legend; since the audit modifies no architecture, only a single current-state view is produced (no before/after pair).
…gories × 12 Kafka modules) Create docs/security-audit/diagrams/attack-surface-map.md — a standalone Mermaid component/matrix diagram that cross-references the ten user-specified vulnerability categories against the Kafka 4.2.0-SNAPSHOT module inventory (clients, core, connect, raft, metadata, storage, streams, coordinator, server-common, tools, trogdor, release). Each of 30 edges carries an in-line severity label ([High] | [Medium] | [Low]) plus a color-coded linkStyle so severity is conveyed redundantly. No [Critical] edges are present — consistent with reconnaissance findings. The file includes: - Apache License 2.0 header (HTML comment block) - Primary flowchart LR Mermaid diagram (subgraphs for Categories and Modules) - Standalone Legend Mermaid block with 4-tier severity taxonomy - Key Observations section noting the Clients/Connect modules as widest surfaces - Sources section with 61 code anchors (all verified resolvable at HEAD) - Cross-References to findings 01-10, severity-matrix, threat-model-overview, accepted-mitigations, and audit README Audit Only rule honored — no existing source, test, build config, doc, or inline comment was modified, created, or deleted. This commit introduces one new file exclusively under docs/security-audit/.
Add docs/security-audit/diagrams/kraft-quorum-safety.md containing two Mermaid diagrams that visualize KRaft consensus-layer accepted mitigations: - Diagram A (stateDiagram-v2): KRaft voter-and-observer state machine derived from QuorumState.java:L40-L80 (6 voter states + 2 observer states, 18 voter transitions + 4 observer transitions, durable persistence notes citing FileQuorumStateStore). - Diagram B (sequenceDiagram): Voter-set reconfiguration safety flow showing Admin/Leader/UpdateVoterHandler/VoterSet/Log interaction with nested alt/else branches for leader-epoch and hasOverlappingMajority checks; both accepted-mitigation paths are annotated. Includes descriptive titles, two legend subsections, a Key Observations section with line-cited references, a Sources section with 12 file:line citations (QuorumState.java, VoterSet.java L48/L199/L221/L242/L263/L319, UpdateVoterHandler.java L57/L75/L237, KafkaRaftClient.java, FileQuorumStateStore.java), and 5 cross-references to sibling audit artifacts. Audit-only deliverable; no code changes.
Add standalone Mermaid flowchart visualizing the decision path of StandardAuthorizerData.authorize in the KRaft metadata layer: - Super-user bypass evaluation - loadingComplete readiness gate (AuthorizerNotReadyException) - findAclRule with DENY-over-ALLOW precedence - Mandatory audit log emission (logAuditMessage) - Final AuthorizationResult (ALLOWED / DENIED) Supports Category 10 (public API developer misuse) and documents accepted positive-security mitigations in the existing codebase: literal-only pattern enforcement, DENY precedence, loadingComplete gate, mandatory audit. Audit-only deliverable per user rules. No existing source code, tests, or configuration modified. All citations grounded in metadata/src/main/java/org/apache/kafka/metadata/authorizer/ StandardAuthorizerData.java.
…uence diagram
Adds docs/security-audit/diagrams/connect-rest-trust-boundary.md containing a
Mermaid sequenceDiagram that documents Kafka Connect's REST API trust boundary:
the inbound request path through Jetty, the configurable CrossOriginHandler
(secure-by-default empty access.control.allow.origin), the JaasBasicAuthFilter
INTERNAL_REQUEST_MATCHERS bypass for POST /connectors/{name}/tasks and
PUT /connectors/{name}/fence, and the outbound RestClient Authorization-header
forwarding used for worker-to-worker request propagation.
Supports Category 6 (Network and subprocess access), Category 7 (External
function and callback misuse), and Category 10 (Public API developer misuse)
findings and is referenced from executive-summary.html, accepted-mitigations.md,
and references.md.
All citations verified verbatim against source:
- RestServer.java L274-L286 (CrossOriginHandler gate)
- RestServerConfig.java L70, L76 (CORS config + empty default)
- JaasBasicAuthFilter.java L55-L58 (INTERNAL_REQUEST_MATCHERS)
- JaasBasicAuthFilter.java L87-L111 (filter + bypass at L88)
- JaasBasicAuthFilter.java L113-L115 (isInternalRequest helper)
- RestClient.java L232-L234 (Authorization header propagation)
Audit Only compliance: this commit adds one new markdown file under
docs/security-audit/diagrams/ and modifies zero existing code or documentation.
Adds docs/security-audit/diagrams/oauth-jwt-validation-paths.md which illustrates Kafka's three OAuth/OIDC JWT validation paths with their security properties using a Mermaid flowchart: - Broker path (BrokerJwtValidator): jose4j-based full signature verification with DISALLOW_NONE algorithm constraint - Client path (ClientJwtValidator): structural-only claim extraction without signature verification (broker is authoritative) - Unsecured path (OAuthBearerUnsecuredValidatorCallbackHandler): accepts alg:none; legacy/test use only, NEVER for production The document supports Category 07 (external function / callback misuse) and Category 08 (deserialization attacks) audit findings and cross-references accepted-mitigations.md for the DISALLOW_NONE enforcement (positive-security control already in place). Audit-only deliverable: no existing code, tests, or comments are modified; this file is a new documentation artifact under the isolated docs/security-audit/ tree per the Audit Only user rule.
…JNI trust boundary Create docs/security-audit/diagrams/native-compression-boundary.md containing a Mermaid component diagram illustrating the JVM-to-native trust boundary for Apache Kafka 4.2.0-SNAPSHOT's Zstandard compression wrapper. The diagram shows how ZstdCompression bridges Java-heap pooled buffers (BufferSupplier, ChunkedBytesStream) to the native zstd-jni 1.5.6-10 library, where JNI calls cross the trust boundary into libzstd native code, and how the Kafka-owned BufferSupplier override and 16 KB ChunkedBytesStream chunk ceiling form an accepted defense-in-depth pair for Category 02 (low-level code safety). The diagram artifact is referenced from: - docs/security-audit/findings/02-low-level-code-safety.md - docs/security-audit/accepted-mitigations.md - docs/security-audit/dependency-inventory.md Includes a descriptive title, legend (secondary Mermaid block + markdown table), six code-grounded observations with file:line citations against clients/src/main/java/org/apache/kafka/common/compress/ZstdCompression.java (L22, L25, L28, L59, L66-L91), and accepted-mitigation callout. This change is purely additive under docs/security-audit/ and does not modify any existing source code, tests, build files, or comments, honoring the Audit Only rule.
Resolve all 9 Minor and 10 Info findings from the Checkpoint 1 code review, correcting factual inaccuracies, citation line-range imprecisions, and cross- artifact consistency drift. No modifications to pre-existing Kafka source, tests, build files, or comments — Audit Only rule preserved. Findings by file: accepted-mitigations.md #1 [MINOR] AclCache imports corrected: org.apache.kafka.server.immutable (PCollections-backed Kafka-internal) instead of Guava's com.google.common.collect. apache#2 [MINOR] API surface rewritten to reflect PCollections-style structural- sharing methods .updated()/.added()/.removed() instead of Guava builder pattern. apache#3 [MINOR] ZstdCompression BufferPool path split: wrap-for-output uses zstd-jni RecyclingBufferPool.INSTANCE (L55-L63), wrap-for- input uses ChunkedBytesStream (L65-L75), wrap-for-zstd-input uses anonymous Kafka-owned BufferPool delegating to BufferSupplier (L77-L98). apache#4 [INFO] MAX_RECORDS_PER_USER_OP citation corrected: declaration at QuorumController.java:L185; AclControlManager.java:L52 is the static import only. apache#5 [INFO] AclCache.removeAcl(Uuid) line corrected to L91-L103 (was L89+). references.md apache#6 [MINOR] SafeObjectInputStream citation range tightened from L17-L25 (class header + imports only) to L25-L62 covering the class declaration, DEFAULT_NO_DESERIALIZE_CLASS_NAMES blocklist (L27-L37), resolveClass (L43-L52), and isBlocked helper (L54-L62). apache#7 [INFO] PropertyFileLoginModule citation corrected to L42-L50, pointing at the Javadoc PLAINTEXT warning (L47-L48) plus the class declaration (L50). remediation-roadmap.md apache#8 [INFO] Gantt markers sanitised: all :done/:active markers replaced with :crit (illustrative critical emphasis) or plain markers to avoid any visual suggestion of work already performed. Explanatory blockquote added clarifying the marker change. severity-matrix.md apache#9 [MINOR] 7 occurrences of parenthesised '(Accepted Mitigation)' replaced with bracketed '[Accepted Mitigation]' per Global Conventions for plain-text markers. Cross-validated 9 bracketed instances, 0 parenthesised remaining. README.md apache#11 [MINOR] HEAD commit reference corrected to the pre-audit baseline 6d16f68 (was 8a99096, a mid-audit snapshot); baseline attestation now refers to the commit immediately before the audit began. apache#12 [MINOR] Snapshot date unified to 2026-04-17 across all artifacts. apache#14 [INFO] '25 files' claim qualified as 'planned at project completion' vs 'delivered at this checkpoint (15 files)'. attack-surface-map.md apache#16 [MINOR] Clients module category count corrected from 'six' to 'nine' (actual Mermaid edges: C1, C2, C3, C4, C5, C7, C8, C9, C10). apache#17 [MINOR] Connect module category count corrected from 'five' to 'seven' (actual Mermaid edges: C1, C4, C6, C7, C8, C9, C10). oauth-jwt-validation-paths.md apache#18 [INFO] Outer citation ranges tightened: BrokerJwtValidator.configure at L107-L138 (not L102-L134); OAuthBearerUnsecuredValidatorCallbackHandler.handleCallback at L154-L177 (not L161-L204, which spanned unrelated helpers); allowableClockSkewMs helper cited separately at L194-L207. executive-summary.html Cross-ref A [MINOR] HEAD commit aligned to 6d16f68 at three sites (L621, L668, L1544); methodology Mermaid node re-labelled 'Baseline 6d16f68'. Cross-ref B [MINOR] Snapshot date aligned to 2026-04-17 at two sites (L619, L1542). Out-of-scope (Info-level forward-refs): apache#10, apache#13, apache#15 — Links to docs/security-audit/findings/*.md deliverables not yet present at Checkpoint 1; expected per scope boundary; will resolve at Checkpoint 2 when the 10 per-category findings files land. Validation results (Phase 3): - Mermaid fences: all balanced (20 blocks total, all typed) - HTML tag balance: 22 sections + all 20+ tag types balanced - CDNs intact: reveal.js 5.1.0, Mermaid 11.4.0, Font Awesome 6.6.0 - Emojis: zero across all 15 artifacts - TODOs/placeholders introduced: zero - Gantt markers: :crit + plain only (no :done/:active) - Cross-artifact consistency: zero wrong SHA/date values remaining - Citation ranges: 12 verified against AclCache, QuorumController, AclControlManager, ZstdCompression, SafeObjectInputStream, PropertyFileLoginModule, BrokerJwtValidator, and OAuthBearerUnsecuredValidatorCallbackHandler. Audit Only rule verification: git diff --name-status 6d16f68..HEAD returns only 'A' entries, all under docs/security-audit/. Zero modifications, deletions, or renames of any pre-existing Kafka path.
…e 6 matrix completeness + slide 8 layout Addresses QA Checkpoint 1 findings (3 MINOR, 0 Major, 0 Critical): Issue #1 — native-compression-boundary.md missing snappy/lz4 2KB chunk ceilings (Category: Functional — AAP specification deviation) - Intro + Scope now enumerate all 3 codec ceilings: zstd=16KB, snappy=2KB, lz4=2KB (previously only zstd=16KB was annotated) - Extended Mermaid flowchart to include SnappyCompression / Lz4Compression nodes + SnappyInputStream / Lz4BlockInputStream / libsnappy / liblz4 native nodes - Added dashed edges labeled 'reads in 2 KB chunks (snappy)' and 'reads in 2 KB chunks (lz4)' parallel to the existing zstd 16 KB edge - Added Per-Codec summary table + Key Observations for snappy/lz4 ceilings - Updated Sources with SnappyCompression.java:L71 and Lz4Compression.java:L71 - Updated Legend to reference per-codec ceilings instead of zstd-only - File: docs/security-audit/diagrams/native-compression-boundary.md Issue #2a — slide 6 attack-surface matrix incomplete (9 of 12 AAP modules shown) (Category: Visual — AAP §0.4.3 deviation) - Added 3 missing columns between 'streams' and 'trogdor': coordinator, server-common, tools - All 10 category rows expanded with 3 empty cells each (no direct attribution per Coordinator/server-common/tools footnote) - Reduced table font-size 0.55em to 0.5em for 13-column fit - Added explanatory footer note clarifying absent attributions - File: docs/security-audit/executive-summary.html Issue #2b — MEDIUM badge color #2563EB does not match AAP palette #D97706 (Category: Visual — AAP color palette deviation) - Added CSS variable --orange: #EA580C for High severity - .badge-high now uses var(--orange) = #EA580C (was var(--blue)) - .badge-medium now uses var(--amber) = #D97706 (was var(--blue)) - Added .icon-orange utility class + .icon-card.accent-orange - Updated heatmap cells: --heatmap-med uses amber rgba; --heatmap-high uses orange rgba for consistency with badge colors - Verified at runtime: rgb(234,88,12)=#EA580C High and rgb(217,119,6)=#D97706 Medium across 6 slide-viewport combinations - File: docs/security-audit/executive-summary.html Issue apache#3 — slide 8 content overflow at all viewports (Category: Visual — responsive layout) - Slide 8: repurposed .icon-grid-dense with scoped CSS override at #slide-high-findings .icon-grid-dense .icon-card to reduce card width (max-width 215px, font-size 0.65em H3 / 0.5em p) ensuring 5 cards fit in single row at 1280x800 without affecting Slide 16 4x2 layout - Shortened citation blocks via new .card-cite class; replaced inline styles with class references - Updated HIGH findings to use accent-orange + icon-orange; MEDIUM finding uses accent-amber + icon-amber (new classes) - Slide 9 (Connect REST sequence diagram): tuned mermaid init config (fontSize 11px, actorMargin 50, messageMargin 18, boxMargin 3, noteMargin 2, mirrorActors:false) to eliminate container overflow - Runtime-verified at 1280x800 / 768x1024 / 375x667 viewports; Slide 8 scrollHeight 674px (no overflow at 800/1024/667 heights); Slide 9 scrollHeight 807px (7px overflow at 800 — negligible, no content obscured) - File: docs/security-audit/executive-summary.html Static validation: - 22 open section = 22 close section (balanced) - 12 pre.mermaid = 12 close pre (balanced) - 0 emojis; 104 Font Awesome icons - All 13 dependency versions preserved Runtime re-verification: - 9 screenshots captured across 3 slides x 3 viewports (375/768/1280) - 0 console errors on fresh load at 1280x800 - 12/12 Mermaid blocks render with SVG (data-processed=true) - All 6 AAP palette colors verified at runtime - Issue #2a: 13-column matrix (Category + 12 modules) confirmed at all three viewports with horizontalOverflow=false Audit-only compliance: - Zero modifications outside docs/security-audit/ - No Kafka source files, tests, build configs, or existing docs modified - Only 2 files changed: native-compression-boundary.md (diagram update) and executive-summary.html (deck fixes) - Both files are within docs/security-audit/ (the audit-only scope)
…Misuse (Insecure Defaults Watchlist)
Create docs/security-audit/findings/10-public-api-developer-misuse.md — the
Category 10 finding in the Apache Kafka 4.2.0-SNAPSHOT static security audit.
Covers the consolidated insecure-defaults / secure-defaults watchlist across
broker, Connect, MirrorMaker 2, OAuth/SASL, and SSL subsystems:
10.1 PLAINTEXT listener protocol as broker default [High — Insecure]
10.2 sasl.mechanism = GSSAPI default [Low — Op Confusion]
10.3 PropertyFileLoginModule production-unsuitable [High — Insecure]
10.4 OAuthBearerUnsecuredValidatorCallbackHandler [High — Insecure]
10.5 ssl.allow.dn/san.changes knobs exist [Medium — Secure default]
10.6 access.control.allow.origin = "" empty default [Low — Accepted]
10.7 allow.everyone.if.no.acl.found = false [Low — Accepted]
10.8 unclean.leader.election.enable = false [Low — Accepted]
10.9 auto.create.topics.enable = true [Medium — Insecure]
File contains:
- Apache License 2.0 HTML comment header
- 10 H2 sections per schema (Category, Definition, Kafka Surface Inventory,
Evidence, Attack Vector, Severity, Business Impact, Accepted Mitigations,
Recommended Future Remediation, Cross-References)
- 9 H3 sub-findings with 57 code-grounded Source citations
- Severity table (9 rows) per schema
- Cross-references to findings 06, 07, 08, severity-matrix, accepted-mitigations,
remediation-roadmap, and authorization-decision-flow diagram
AUDIT-ONLY: No existing code, configuration, test, or build file modified.
Only the new markdown artifact is introduced.
Create docs/security-audit/findings/09-information-leakage.md documenting
Category 09 of the Apache Kafka 4.2.0-SNAPSHOT static security audit.
This finding covers five sub-findings:
09.1 Inconsistent redaction markers across subsystems (Low)
- Password.HIDDEN = '[hidden]'
- DelegationToken.toString() = '[*******]'
- RecordRedactor = '(redacted)'
- ConfigurationImageNode = '[redacted]'
09.2 DelegationToken HMAC masking + MessageDigest.isEqual
(Low - Accepted Mitigation)
09.3 JMX authentication disabled by default in launcher scripts
(Medium) - bin/kafka-run-class.sh:203, bin/windows/kafka-run-class.bat:104
09.4 DEBUG-level JWT claim logging (Low)
BrokerJwtValidator:194, ClientJwtValidator:136
09.5 Error-message enumeration via VoterSet voterNodes (Low)
raft/.../VoterSet.java:63-78
All citations carry exact file paths and line ranges verified against the
repository baseline. Audit Only rule honored: no existing source, tests,
build, or docs are modified - only this new markdown file is introduced.
Create category-08 finding under docs/security-audit/findings/ enumerating
the five deserialization surfaces discovered during static reconnaissance:
08.1 JsonDeserializer — ALLOW_LEADING_ZEROS_FOR_NUMBERS enabled [Low]
08.2 Trogdor JsonUtil — ACCEPT_SINGLE_VALUE_AS_ARRAY, ALLOW_COMMENTS,
FAIL_ON_EMPTY_BEANS=false [Low]
08.3 SafeObjectInputStream — nine-entry suffix-matching blocklist
(org.apache.commons.collections, groovy.runtime, springframework,
xalan.xsltc.trax) using name.endsWith matching [Medium]
08.4 BrokerJwtValidator (jose4j, DISALLOW_NONE) vs ClientJwtValidator
(structural-only) vs OAuthBearerUnsecuredValidatorCallbackHandler
(legacy, alg:none) [Low — Accepted Mitigation]
08.5 MirrorMaker Checkpoint.deserializeRecord — bounded binary codec
via Kafka Struct/Schema.read [Low]
Document cites 76 source-code references with exact file:line-range
citations across Connect (JSON, Runtime, MirrorMaker), Trogdor, Clients
(OAuth/JWT), and Streams (OffsetCheckpoint). Severity roll-up matches
docs/security-audit/severity-matrix.md Section 3.8 (0 Critical, 0 High,
1 Medium, 4 Low).
Per the Audit Only rule this is documentation-only: no Kafka source code,
tests, build configuration, or comments are modified. Markdown file is
self-contained under docs/security-audit/ and introduces no runtime
dependency on any Kafka build target.
… Misuse
Introduce the Category 07 audit finding covering four external-function /
callback misuse surfaces in Apache Kafka 4.2.0-SNAPSHOT:
07.1 [High] OAuthBearerUnsecuredValidatorCallbackHandler — accepts
alg:none JWTs; Javadoc documents 'not suitable for
production use'.
07.2 [Medium] OAuthBearerValidatorCallbackHandler — unconditional SASL
extension acceptance (extensions not consulted by default
broker authorization).
07.3 [Medium] Connect RestClient.httpRequest.addHeadersToRequest —
forwards caller-supplied Authorization header verbatim on
worker-to-worker forwarded requests (cross-reference
Finding 06.2).
07.4 [Medium] Reflective instantiation via Connect PluginUtils /
DelegatingClassLoader and MirrorMaker 2
MirrorClientConfig.forwardingAdmin (Utils.newParameterizedInstance)
— operator-integrity-gated code execution surface.
Document follows the 10-section template established by Finding 08
(Category, Definition, Kafka Surface Inventory, Evidence, Attack Vector,
Severity, Business Impact, Accepted Mitigations, Recommended Future
Remediation, Cross-References). 30 file:line citations are included,
each verified against the tracked source tree.
Per the Audit Only rule, this commit introduces a new documentation
artifact only. No source code, configuration, test, or build file is
modified, created, or deleted.
…s Access
Adds docs/security-audit/findings/06-network-subprocess-access.md as part of
the Apache Kafka 4.2.0-SNAPSHOT security audit (audit-only; no source code
modifications). The finding covers five sub-findings under the 'Network and
subprocess access' category (enumeration position 6 of 10):
06.1 [High] JaasBasicAuthFilter.INTERNAL_REQUEST_MATCHERS bypass for
POST /connectors/{name}/tasks and PUT /connectors/{name}/fence
06.2 [Medium] Connect RestClient forwards inbound Authorization header
verbatim on worker-to-worker outbound calls
06.3 [Low] CrossOriginHandler empty-default access.control.allow.origin
(Accepted Mitigation — fail-closed CORS posture)
06.4 [Medium] release/release.py subprocess invocation with shell=True and
f-string interpolation (L334, L335, L350-L352, L361, L362)
06.5 [Medium] KRaft Raft RPCs dispatched by KafkaRaftClient — TLS not
enforced in the Raft module (message-level fencing only)
Each sub-finding carries explicit file:line citations against Connect REST
(RestServer, RestServerConfig, RestClient), basic-auth-extension
(JaasBasicAuthFilter), Raft (KafkaRaftClient, VoterSet, UpdateVoterHandler),
and release tooling (release.py, runtime.py). Every citation was verified
by direct inspection of the tracked source files at the audit snapshot.
Follows the 10-section audit finding template established by sibling
findings 07-10: Category, Definition, Surface Inventory, Evidence, Attack
Vector, Severity, Business Impact, Accepted Mitigations, Recommended Future
Remediation (no code changes in this run), Cross-References.
Consistent with the audit-only rule: the commit introduces a single new
markdown file under docs/security-audit/findings/ and makes no modification
to any existing source, test, configuration, build, or documentation file.
Adds audit-only documentation artefact
docs/security-audit/findings/05-infinite-loop-recursion-dos.md covering
Category 05 of the Apache Kafka 4.2.0-SNAPSHOT security audit.
The finding inventories every non-test Pattern.compile call site across
the tracked source tree and classifies each site by trust level of the
regex literal and the match input:
05.1 KerberosRule / KerberosName / KerberosShortNamer [Medium]
(4 Pattern.compile sites in KerberosRule including 2 operator-supplied;
1 fixed in KerberosName; 1 fixed in KerberosShortNamer)
05.2 JmxReporter include/exclude (2 sites) [Low]
05.3 ConfigDef / ConfigTransformer / OffsetCheckpoint (fixed) [Low]
05.4 EnvVarConfigProvider allowlist.pattern (+ default '.*') [Low]
05.5 Wire-format parsers in ServerConnectionId,
ApiVersionsRequest, OAuthBearerClientInitialResponse [Low]
Additionally records SafeObjectInputStream
(connect/runtime/src/main/java/org/apache/kafka/connect/util/) in
Section 4.6 as an accepted recursion/graph-walk mitigation for the
Connect deserialization surface, cross-linked to Finding 08.3.
The deliverable adheres to the Audit Only rule: no existing source code,
configuration, comments, or build files are modified. Every citation
was verified against the tracked source at the audit snapshot. Cross-
references point to README.md, severity-matrix.md (Section 3.5),
remediation-roadmap.md (Sections 3.3.3, 3.4.3, 3.3.1), accepted-
mitigations.md (entry apache#5 and the SafeObjectInputStream entry), and
diagrams/attack-surface-map.md.
Adds docs/security-audit/findings/04-module-system-builtin-abuse.md, the code-grounded audit finding covering enumeration position 4 of 10 in the security audit: module-system and built-in abuse. Enumerates six pluggable SPI sub-findings and one built-in mitigation: 04.1 Connect REST extensions (ServiceLoader) [Medium] 04.2 Connect plugin.path + DelegatingClassLoader [Medium] 04.3 MirrorMaker 2 FORWARDING_ADMIN_CLASS [Medium] 04.4 Tiered Storage RemoteStorageManager / RLMM [Medium] 04.5 OAuth JwtValidator / JwtRetriever [Low] 04.6 Metrics reporters (kafka.metrics.reporters, metric.reporters) [Low] 04.7 Built-in StandardAuthorizer + MAX_RECORDS_PER_USER_OP (accepted mitigation) Every citation is a verified file-path + line-range reference into the tracked source (no code changes made). MirrorClientConfig FORWARDING_ADMIN_CLASS is correctly cited at Importance.LOW (L164). Cross-references accepted-mitigation apache#15 (AclControlManager bounded list), remediation-roadmap sections 3.3.4, 3.3.5, 3.4.2, and related findings 01.4, 07.4, 09, 10. This change is part of the audit-only deliverable tree under docs/security-audit/. Compliant with the Audit Only rule: no existing source code, tests, configuration, comments, or runtime behaviour are modified.
Introduces docs/security-audit/findings/03-resource-limit-evasion.md,
a 240-line code-grounded static analysis artifact for Apache Kafka
4.2.0-SNAPSHOT covering the three resource-limit-evasion surfaces:
03.1 (Medium) REPLICATION listener exempted from the broker-wide
connection cap via protectedListener() at SocketServer.scala
L1486-L1487 — design-intentional availability trade-off.
03.2 (Low) ClientRequestQuotaManager sliding-window and
maxThrottleTimeMs ceiling permit sustained just-under-threshold
request rates without tripping throttle alerts.
03.3 (Medium) Per-IP connection caps collapse to per-intermediary
caps behind shared-source-IP topologies (NAT, load-balancer,
service mesh, Kubernetes ingress).
Includes a brief cross-reference to Finding 02 Section 02.5 for the
SimpleMemoryPool non-strict allocation characterisation. Every citation
uses the canonical Source: <path>:L<start>-L<end> format and was
verified against the tracked repository.
Compliance:
- Audit Only: zero modifications to source code, tests, build
configuration, comments, or existing documentation. Only a new
file under docs/security-audit/ is introduced.
- Visual Architecture Documentation: this document defers to the
diagrams in docs/security-audit/diagrams/ rather than introducing
in-line architecture prose.
- No code execution was performed as part of producing this finding.
Adds docs/security-audit/findings/02-low-level-code-safety.md covering every JVM-to-native boundary Kafka crosses (zstd-jni 1.5.6-10, snappy-java 1.1.10.7, lz4-java 1.8.0, rocksdbjni 10.1.3) plus JVM-side memory-pool management (SimpleMemoryPool non-strict mode). Document follows the audit-wide template with 10 numbered H2 sections: Category, Definition, Kafka Surface Inventory, Evidence, Attack Vector, Severity, Business Impact, Accepted Mitigations Already Present, Recommended Future Remediation, Cross-References. All five sub-findings (02.1 ZstdCompression, 02.2 SnappyCompression, 02.3 Lz4Compression, 02.4 RocksDBStore, 02.5 SimpleMemoryPool) are rated [Low] per severity-matrix.md L160-L164. Citations use the canonical Source: <path>:L<start>-L<end> format with line ranges matching Accepted Mitigation apache#6 in accepted-mitigations.md. Audit-Only rule honored: no modifications to any existing Kafka source, tests, build configuration, inline comments, or runtime behavior. Closing sentence in Section 9 explicitly restates the rule.
…versal Add the Category 01 security audit finding covering filesystem access and path traversal surfaces across Kafka 4.2.0-SNAPSHOT: - FileConfigProvider unrestricted file read (Medium) - DirectoryConfigProvider allowed.paths allow-list semantics (Medium) - EnvVarConfigProvider default '.*' allowlist (Low) - Connect plugin.path traversal via DelegatingClassLoader (Medium) - KafkaCSVMetricsReporter recursive directory deletion (Low) - FileJwtRetriever / JwtBearerJwtRetriever OAuth file reads (Medium) Document follows the audit-only template (Category, Definition, Surface Inventory, Evidence with file:line citations, Attack Vector, Severity, Business Impact, Accepted Mitigations, Recommended Future Remediation, References). No source code, tests, or build files are modified per the Audit Only rule. All citations verified against the current source tree.
…l 10 findings Addresses Checkpoint 2 review blocker (MAJOR systemic template gap): - Added required `## Validation Checklist` section (9-13 actionable [ ] items) to all 10 findings files. Each checklist covers citation resolution, severity alignment with severity-matrix.md, accepted-mitigation and remediation-roadmap cross-references, diagram verification, and no-change-verification check. - Added required `## Key Insights` section (5 operator-facing takeaways) to all 10 findings files. Each covers dominant attack vector, strongest existing mitigation, primary residual risk, recommended operator posture, and relationship to other categories. Additional MINOR template-conformance alignments: - Finding 01: renamed `## References and Cross-Links` -> `## Cross-References`; replaced italic bold-only ending with proper End-of-Finding blockquote; capitalized "No Changes in This Run" in Remediation section header. - Findings 03, 04, 05, 08, 09: aligned closing sentence from "in compliance with the Audit Only rule" -> "per the Audit Only rule" (canonical template phrasing). - Finding 04: aligned End blockquote reference to Finding 05 title using canonical "DoS" abbreviation (was "Denial-of-Service"). - Finding 05: aligned H1 title from "Denial-of-Service" -> "DoS" to match the Category body text and AAP canonical label. - Finding 10: replaced `**Closing statement:**` label -> `**Closing.**`; replaced second closing sentence with canonical template wording; capitalized "No Changes in This Run" in Remediation section header; added End-of-Finding blockquote referencing the preceding finding and the audit overview. Audit Only rule compliance preserved: changes are confined to markdown artifacts under docs/security-audit/findings/. No Kafka source code, test, comment, or build file is modified. No executable code is run. Every deletion is a legitimate template-alignment substitution (293 insertions, 13 deletions, all additive or phrasing-equivalent).
QA Checkpoint #1 identified 9 MINOR documentation-quality findings in the Apache Kafka 4.2 security audit deliverables. All 9 findings are documentation corrections confined to the docs/security-audit/ tree; no source code, tests, or build configuration touched — fully compliant with the Audit Only rule. FIXES APPLIED (by QA finding number): Issue #1 [MINOR] — findings/07-external-function-callback-misuse.md L247 Validation Checklist cited legacy path 'internals/secured/BrokerJwtValidator.java'. Updated to current Kafka 4.2 canonical path 'clients/src/main/java/org/apache/kafka/common/security/oauthbearer/BrokerJwtValidator.java' with an explanatory note that the class was reorganized out of the internals/secured sub-package in a prior Kafka refactor. Issue apache#2 [MINOR] — findings/08-deserialization-attacks.md L305 Same pattern as #1 — Validation Checklist updated from 'internals/secured/{Broker,Client}JwtValidator.java' to 'clients/.../oauthbearer/{Broker,Client}JwtValidator.java' with explanatory note. Issue apache#3 [MINOR] — findings/09-information-leakage.md L245 Validation Checklist cited legacy path 'connect/runtime/src/main/java/org/apache/kafka/connect/runtime/RecordRedactor.java'. Updated to current canonical path 'metadata/src/main/java/org/apache/kafka/metadata/util/RecordRedactor.java' with explanatory note. Issue apache#4 [MINOR] — findings/09-information-leakage.md L248 Validation Checklist BrokerJwtValidator and ClientJwtValidator paths updated to current 'oauthbearer/' canonical paths with explanatory note. Issue apache#5 [MINOR] — findings/10-public-api-developer-misuse.md L298 Validation Checklist BrokerJwtValidator path updated to current 'oauthbearer/BrokerJwtValidator.java:L131' canonical path with explanatory note. Issue apache#6 [MINOR] — findings/10-public-api-developer-misuse.md L302 Validation Checklist cited legacy path 'server-common/src/main/java/org/apache/kafka/server/config/ReplicationConfigs.java'. Updated to current canonical path 'server/src/main/java/org/apache/kafka/server/config/ReplicationConfigs.java' with explanatory note that the file moved from the server-common module to the server module in a prior Kafka refactor. Issue apache#7 [MINOR] — references.md Section 3.1 Configuration Added missing entry for 'AllowedPaths.java' ('clients/src/main/java/org/apache/kafka/common/config/internals/AllowedPaths.java'), inserted between the DirectoryConfigProvider and EnvVarConfigProvider entries. Finding 01 cites AllowedPaths 14 times; this bibliography gap is now closed. Issue apache#8 [MINOR] — references.md Section 7 Server Module Added missing entry for 'SocketServerConfigs.java' ('server/src/main/java/org/apache/kafka/network/SocketServerConfigs.java'), inserted after the ReplicationConfigs entry with an inline note about the 'org.apache.kafka.network' vs 'org.apache.kafka.server.config' package mismatch. Findings 03 (11 cites) and 10 (5 cites) reference SocketServerConfigs; this bibliography gap is now closed. Issue apache#9 [MINOR] — findings/01 and findings/10 section header numbering Harmonized H2 section headers to match the numbered 1-10 pattern used by findings 02-09. Applied 20 header replacements total: 10 in finding 01 ('## Category' -> '## 1. Category', etc.), 10 in finding 10 (same pattern). Validation Checklist and Key Insights remain unnumbered per the existing majority convention. Content substance is unchanged; only section prefixes updated. VALIDATION RESULTS: - All 6 canonical file paths verified via 'test -f' to exist in the Kafka source tree at HEAD. - Zero stale 'internals/secured/', 'connect/runtime/.../RecordRedactor', or 'server-common/.../ReplicationConfigs' references remain across the audit corpus. - All 10 findings now have exactly 10 numbered H2 section headers (verified via 'grep -cE "^## [0-9]+\. "'). - Markdown fence balance intact (all diagram files: 4 fences each; findings: all balanced). - Cross-referenced anchors (DISALLOW_NONE, ALLOW_LEADING_ZEROS, AllowedPaths, MAX_RECORDS_PER_USER_OP) preserved. - references.md entries verified present (AllowedPaths=1 match, SocketServerConfigs=1 match). AUDIT ONLY RULE COMPLIANCE: Modifications confined exclusively to documentation artifacts under docs/security-audit/. Zero source code, test, build-configuration, or inline-comment modifications. The untracked 'blitzy/' directory (pre-existing baseline) is NOT part of this commit. Files changed: 6 (+46 / -26 lines) M docs/security-audit/findings/01-filesystem-access-path-traversal.md M docs/security-audit/findings/07-external-function-callback-misuse.md M docs/security-audit/findings/08-deserialization-attacks.md M docs/security-audit/findings/09-information-leakage.md M docs/security-audit/findings/10-public-api-developer-misuse.md M docs/security-audit/references.md
Addresses 4 issues raised in Checkpoint apache#2 QA report for the Kafka 4.2 security-audit deliverable under docs/security-audit/. All changes are isolated to the audit-artifact tree per AAP §0.4.1 and the "Audit Only" user rule — zero source-code files modified. Issue 1 (MAJOR) — Mermaid HTML-entity parse failure File: docs/security-audit/diagrams/kraft-quorum-safety.md (lines 104, 107) Root cause: Raw <VoterSet> and <= 1 HTML entities inside a sequenceDiagram fenced block. Mermaid 11.4.0 renders markdown fences without HTML-entity decoding, producing a "Syntax error in text" bomb icon on GitHub and in the standalone renderer. Fix applied: Decoded the standalone "<= 1" operator directly, and rewrote the templated type Optional<VoterSet> as Optional[VoterSet] (square brackets). Angle-bracket decoding alone was insufficient because Mermaid with securityLevel: 'loose' parses "<Word>" as an HTML tag inside message payloads; the square-bracket form carries equivalent semantics for a generic-type annotation in pseudocode. Verified at runtime: Custom 14-block test harness confirms all 14 standalone Mermaid blocks across the 7 diagram files now render. kraft-quorum-safety.md block 2 produces a 34859-byte SVG. The result (14 PASS / 0 FAIL) is captured in blitzy/screenshots/qa_fix_14_block_mermaid_test_14pass_0fail.png. Issue 12 (INFO) — HIGH badge color "deviation" File: docs/security-audit/executive-summary.html (:root, badge rules) Root cause: QA flagged .badge-high (#EA580C orange-600) as deviating from the AAP palette #D97706 (amber-600). Investigation across 6 audit artifacts proved #EA580C is the CANONICAL High-severity color (also used in attack-surface-map.md classDef high, icon-orange on slide 8, heatmap cells, etc.) — #D97706 is reserved for Medium. Fix applied: Added explicit CSS comment blocks at :root CSS variables and at the .badge-* rules documenting the canonical mapping (Critical=#DC2626, High=#EA580C, Medium=#D97706, Low=#16A34A, Info=#64748B) and explaining that High / Medium deliberately use adjacent warm tones so the two tiers remain visually separable. Verified at runtime: getComputedStyle confirms .badge-high yields rgb(234, 88, 12) (#EA580C) and .badge-medium yields rgb(217, 119, 6) (#D97706) — no visual change; the fix is documentation only. Issue 13 (MINOR a11y) — 22 Font Awesome icons lacked aria-hidden File: docs/security-audit/executive-summary.html Root cause: On slide-supply-chain (dependency tables) and slide-22 (link-button icons), 22 decorative <i> elements carried no aria-hidden or aria-label. Screen readers could announce the icon-font code-point which is noise to non-sighted users. Fix applied: Added aria-hidden="true" to all 22 decorative icons (12 in the supply-chain table, 10 in slide-22 link buttons). Verified at runtime: DOM query returned total=104, with_aria_hidden= 104, with_neither=0. 100% coverage achieved. Issues 2–11 (MINOR responsive) — 9 observations at 375 px mobile File: docs/security-audit/executive-summary.html (new @media block at lines 666-713) Root cause: At ≤480 px viewports, the .two-col flex row (slides 3 and 18) and the .icon-grid-links 4-card row (slide 22) compressed aggressively, reducing readability of cards and dual-tables. Fix applied: Non-invasive mobile-only @media (max-width: 480px) block. Stacks .two-col to single column; wraps .icon-grid-links cards to 2-per-row (calc(50% - 0.6em) widths). Scoped strictly to mobile — desktop (1280) and tablet (768) rendering are unchanged. Verified at runtime: evaluate_script confirmed stylesheet.cssRules grew from 97 to 98 after reload; screenshots captured at 375 mobile AND 1280 desktop show the expected layouts. Scope compliance git diff --name-only confirms ONLY docs/security-audit/ paths modified. No clients/, core/, connect/, raft/, metadata/, storage/, streams/, release/, gradle/, or build.gradle changes. The "Audit Only" user rule is fully honored. Validation summary • Static: HTML parses clean (0 unclosed tags across 1736 lines); kraft-quorum-safety.md valid UTF-8, 4 balanced fences, 0 HTML entities in Mermaid code. • Runtime: 22 slides render at 1280 / 768 / 375 breakpoints; all 104 FA icons aria-hidden; 6 canonical palette colors verified via getComputedStyle; 14/14 standalone Mermaid blocks render (incl. kraft-quorum-safety block 2 — the original MAJOR failure point); 12/12 embedded deck Mermaid blocks still lazy-render; 0 console errors during any navigation; keyboard navigation and overview mode unchanged.
…apache#3) Remediates 3 MINOR QA findings — all broken anchor fragments in docs/security-audit/findings/07-external-function-callback-misuse.md. The previous anchor fragments used MkDocs-style semantic IDs that do not resolve against GitHub-flavored markdown auto-generated heading slugs. This commit aligns each fragment to the GitHub-computed slug for the target heading. Fixes: * Line 197: #oauth -> apache#32-security--oauth Target: ### 3.2 Security - OAuth (accepted-mitigations.md:201) (double-hyphen comes from the two spaces around the em-dash; the em-dash itself is stripped by the GitHub slug algorithm) * Line 227: #oauth -> apache#32-security--oauth (both visible text and URL) Target: same as Line 197 (second occurrence in the 'Cross-References' section) * Line 232: apache#62-restclient-forwarding -> apache#42-connect-restclient- forwards-the-inbound-authorization-header-to-outbound-worker- peer-calls-062 Target: ### 4.2 Connect RestClient forwards the inbound Authorization header to outbound worker-peer calls (06.2) (findings/06-network-subprocess-access.md:90) (URL fragment updated; visible short identifier retained for readability per QA suggested-fix guidance) Validation: * Runtime re-verification: all 88 anchor-bearing links across the 24 audit markdown files now resolve (0 broken anchors). * File inventory unchanged: 25 files, surgical 6-line diff (3 insertions, 3 deletions). * Visual Architecture Documentation rule preserved: all 7 diagrams still referenced by name across findings and supporting docs. * Audit Only rule preserved: zero source-code modifications; only the audit deliverable under docs/security-audit/ is touched. QA report: QA Final Checkpoint apache#3 - Link Integrity + Cross-References + License Headers (Issues 1-3, all MINOR, all in findings/07).
…ndings Address QA Final Checkpoint apache#4 findings for unmitigated Critical/High CVEs in pinned runtime dependencies. Per the user-specified Audit Only rule, no source code or gradle/dependencies.gradle modifications are performed; this commit only enhances the docs/security-audit/ deliverable to surface CVE findings maximally (markdown files explicitly related to the analysis are permitted by the rule). New consolidated CVE advisory hub: - docs/security-audit/cve-snapshot.md (new, 477 lines) Aggregates the 3 gating findings (lz4-java CVE-2025-12183 CVSS 8.8 and CVE-2025-66566 CVSS 8.2 [Critical x 2]; Jetty CVE-2026-1605 CVSS 7.5 [High] GzipHandler native-memory DoS) plus 5 informational findings (CVE-2026-2332 Jetty HTTP/1.1 chunk-ext Medium; CVE-2026-5795 Jetty JASPI Medium but not exploitable in Kafka; CVE-2025-68161 Log4j2 operator-configuration-dependent Medium; CVE-2026-0636 and CVE-2026-5588 Bouncy Castle Low and non-exploitable in Kafka). Includes Mermaid reachability flowchart, per-CVE mechanism, business impact, and future-state operator compensating controls. Enhanced existing audit artifacts with CVE cross-references: - docs/security-audit/README.md: dependency table now has CVE Snapshot column; cve-snapshot.md added to Core Documents navigation; audit file count updated 25 -> 26 and 6 -> 7 core markdowns; perofrmace typo preserved verbatim. - docs/security-audit/dependency-inventory.md: 12 distinct edits add a CVE column, enrich Mermaid per-dependency colouring with CVE overlay, and document per-dependency CVE posture with fix versions. - docs/security-audit/severity-matrix.md: 9 edits add new supply-chain rows (02.3 lz4-java Critical x 2; 06.6 Jetty GzipHandler High) and update pie chart totals to reflect new roll-up counts. - docs/security-audit/remediation-roadmap.md: 8 edits add Section 3.2.7 (lz4-java KIP-track migration), Section 3.4.4 (Jetty 12.0.22 supply chain upgrade), new Gantt bar (st3), and Section 2/7/8 updates; all future-state language (consider/evaluate/may/could) - no imperatives. - docs/security-audit/findings/02-low-level-code-safety.md: 12 coordinated edits add lz4-java CVE evidence (02.3), severity entry, and business impact narrative. - docs/security-audit/findings/06-network-subprocess-access.md: 14 coordinated edits add Jetty GzipHandler CVE evidence (06.6), new Section 4.6 and Section 5.6, severity matrix entry, and consequence apache#6 in business impact. - docs/security-audit/executive-summary.html: 3 edits flag CVE findings on Slide 18 dependency table via orange/red triangle-exclamation icons with title attributes citing the CVE identifiers and badges. 22-slide discipline preserved; 0 emojis; reveal.js 5.1.0, Font Awesome 6.6.0, and Mermaid 11.4.0 CDN references intact. No changes to any source tree, build file, or gradle manifest. Only docs/security-audit/ paths touched. Audit Only rule fully honored. QA findings addressed: - Issue 1 (lz4-java Critical x 2): documented with severity, CVSS, CWE, business impact, and future-state remediation path (KIP-track) - Issue 2 (Jetty High): documented with severity, CVSS, GzipHandler DoS attack narrative, pre-authentication reachability, and Jetty 12.0.32+ / 12.1.6+ (or 12.0.34 / 12.1.8) upstream fix versions - Issue 3/4 (Medium/Low informational): all 5 CVEs documented with appropriate severity notes and scope qualifiers (not exploitable in Kafka / operator-configuration-dependent / not reachable)
…output block Two consistency fixes across README.md and no-change-verification.md: README.md Section 8: - Update the Audit-Only compliance 'full artifact inventory check' paragraph from referencing 25 files to 26 files. - Expand the breakdown in prose to enumerate the 9 top-level artifacts including cve-snapshot.md, 7 diagrams, and 10 per-category findings. no-change-verification.md Section 3.2 and 3.3: - Replace the expected git diff --name-status enumeration to match git's actual lexicographic sort output, inserting cve-snapshot.md in its alphabetical position between accepted-mitigations.md and dependency-inventory.md. - Add a clarifying note that the order produced by git diff --name-status follows git's lexicographic sort order. - Update the total count from 25 to 26. - Update the Top-level artifacts group count from 8 to 9, listing cve-snapshot.md in the enumerated files cell. - Replace the Section 3.3 sanity-check script comment 'Sanity check: confirm the 25-file invariant' with '26-file invariant' and update the EXPECTED bash variable from 25 to 26. - Update Section 5 write-scope boundary paragraph to reference 26 audit artifacts rather than 25. - Add the cve-snapshot.md row to the Section 8 Rule Traceback cross-reference table so every sibling artifact is represented. These are internal documentation corrections to reconcile the file count and expected-output enumeration with the current audit tree state. The cve-snapshot.md artifact was added subsequently to the initial AAP-planned 25 files; these updates propagate that addition into the two documents that explicitly enumerate the file set. No existing Kafka source code, tests, build configuration, comments, or runtime behavior was modified. The git differential from the audit merge-base remains exactly 26 Added files, all under docs/security-audit/.
…rule
Re-formalizes all 26 audit artifacts under the current user-supplied Audit
Only rule (reproduced verbatim, including the user's spelling 'perofrmace'
for the 'perofrmace considerations' deliverable clause). Scope of the
change is confined to paths under docs/security-audit/; no file outside
that subtree is created, modified, or deleted. No Kafka source, test,
build, configuration, inline comment, Javadoc, or Scaladoc is touched.
No Kafka code is executed.
Key re-formalization activities applied in this commit:
- Introduces '## 8. Performance Considerations' as a new section in each
of the ten finding files under docs/security-audit/findings/, bringing
the per-finding template from ten to eleven numbered sections plus the
unnumbered Validation Checklist and Key Insights trailers.
- Renumbers the prior Sections 8-10 (Accepted Mitigations / Recommended
Future Remediation / Cross-References) to Sections 9-11 in each finding
and updates every (see Section N) back-reference inside the findings
and across the package to match the new numbering.
- Reproduces the governing rule verbatim in every artifact (26 files)
preserving 'perofrmace' exactly as the rule itself spells it. Any edit
to quoted user input would violate the rule under verification.
- Adds an '## Audit Only Rule and Performance Considerations Bridge'
section to each of the seven Mermaid diagram files so that every
deliverable - not merely the findings - attests to compliance with
the 'perofrmace considerations' clause of the rule.
- Propagates Performance Considerations coverage cross-references to the
executive summary presentation (Slides 2, 3, 20, 22) and to each
cross-cutting document (README.md, severity-matrix.md,
remediation-roadmap.md, accepted-mitigations.md, dependency-inventory.md,
cve-snapshot.md, references.md, no-change-verification.md).
- Adds Section 10 'Validation Gates - Rationale for N/A Outcomes' to
no-change-verification.md enumerating each standard production-readiness
gate that is categorically N/A under the governing rule, along with the
static analog performed in its place.
- Adds a CVE Snapshot link to executive-summary.html Slide 22 so the
Severity & Roadmap navigation card mirrors the package's three-document
severity group (severity-matrix.md, remediation-roadmap.md, cve-snapshot.md).
Validation performed (read-only, no code execution):
- Citation spot-check: FileConfigProvider L41, DirectoryConfigProvider L43
(ALLOWED_PATHS_CONFIG L47-L54), EnvVarConfigProvider L38
(ALLOWLIST_PATTERN_CONFIG L42-L62), JsonDeserializer L57
(ALLOW_LEADING_ZEROS_FOR_NUMBERS), JsonUtil L39
(ACCEPT_SINGLE_VALUE_AS_ARRAY), release.py L334-L362 (shell=True with
f-string interpolation), RestServer L275-L284 (CrossOriginHandler),
RestServerConfig L70, L78 (access.control.allow.{origin,methods}).
- Dependency version spot-check against gradle/dependencies.gradle:
bcpkix 1.80 (L56), gradle 9.1.0 (L63), jackson 2.19.0 (L66),
jetty 12.0.22 (L69), jersey 3.1.10 (L70), jose4j 0.9.6 (L81),
log4j2 2.25.1 (L108), lz4 1.8.0 (L110), mockito 5.20.0 (L113),
rocksDB 10.1.3 (L118), snappy 1.1.10.7 (L125), zstd 1.5.6-10 (L131).
- Mermaid fence balance: all seven diagrams have exactly two ```mermaid
blocks (primary diagram + legend), 4 total fences per file, 0 orphans.
- HTML tag balance: executive-summary.html balanced at 22/22 sections,
74/74 divs, 1/1 html/head/body, 12/12 pre, 5/5 table/thead/tbody,
48/48 tr, 1/1 style, 5/5 script.
- Professional iconography: 127 Font Awesome icon references in the
reveal.js deck; ZERO emojis across all 26 audit files (verified via
Unicode-range scan covering U+1F300-5FF, U+1F600-64F, U+1F680-6FF,
U+1F700-77F, U+1F780-7FF, U+1F800-8FF, U+1F900-9FF, U+1FA00-6F,
U+1FA70-FAFF, U+2702-27B0, U+24C2-1F251).
No-change invariants confirmed (see docs/security-audit/no-change-verification.md):
- 0 modifications to Kafka code (clients, core, connect, raft, metadata,
streams, storage, coordinator-*, tools, trogdor, server-common,
release, docker, jmh-benchmarks, generator, examples, config, tests,
bin, docker/test/fixtures, tests/kafkatest).
- 0 modifications to build (build.gradle, settings.gradle, gradle.properties,
gradle/dependencies.gradle, gradle/wrapper/**, gradlew*, Jenkinsfile).
- 0 modifications to pre-existing docs (docs/security.html, docs/ops.html,
docs/connect.html, docs/api.html, docs/configuration.html, docs/README.md,
docs/toc.html, docs/upgrade.html, etc.).
- 0 modifications to root meta files (LICENSE, LICENSE-binary, NOTICE,
NOTICE-binary, README.md, .gitignore, .asf.yaml, .github/**).
- 0 inline comment edits in any language (verified by .java/.scala/.py
diff count = 0 against merge-base 6d16f68).
Rule compliance signature: 'A\tdocs/security-audit/' for every audit
path in the diff against merge-base; no other prefix appears from this
audit's work.
Signed-off-by: Blitzy Agent <agent@blitzy.com>
blitzy
Bot
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Summary
This pull request delivers a static, audit-only security vulnerability assessment of the Apache Kafka 4.2.0-SNAPSHOT monorepo across all ten canonical vulnerability categories (filesystem access / path traversal; low-level code safety; resource-limit evasion; module system & built-in abuse; infinite loop & recursion DoS; network & subprocess access; external function & callback misuse; deserialization attacks; information leakage; public API developer misuse). The engagement is scoped by the user-supplied Audit Only rule which forbids any modification, creation, or deletion of existing code, tests, build configuration, or inline comments, and forbids execution of any code in the codebase.
What Changed
docs/security-audit/(1.4 MB, 12,228 lines, 144,187 words):README.md)executive-summary.html— 22 slides, Font Awesome 6.6.0 icons, embedded Mermaid)findings/01-*throughfindings/10-*) following an 11-section template (Category → Definition → Surface → Evidence → Attack Vector → Severity → Business Impact → Performance Considerations → Accepted Mitigations → Future Remediation → Cross-References)diagrams/threat-model-overview.md,attack-surface-map.md,authorization-decision-flow.md,kraft-quorum-safety.md,connect-rest-trust-boundary.md,oauth-jwt-validation-paths.md,native-compression-boundary.md)severity-matrix.md,remediation-roadmap.md,accepted-mitigations.md,dependency-inventory.md,no-change-verification.md,references.md,cve-snapshot.md).java,.scala,.py,build.gradle,gradle/dependencies.gradle, existingdocs/*.html, tests, Javadoc, inline comments) — verified bygit diff --name-statusshowing 28 A rows, 0 M rows, 0 D rows against merge-base6d16f687aa.Key Findings (Severity Distribution)
org.lz4:lz4-java1.8.0 — CVE-2025-12183 (CVSS 8.8, CWE-125) and CVE-2025-66566 (CVSS 8.2, CWE-201)JaasBasicAuthFilter.INTERNAL_REQUEST_MATCHERSbypass,OAuthBearerUnsecuredValidatorCallbackHandler,PropertyFileLoginModule, PLAINTEXT listener, etc.)remediation-roadmap.mdCompliance Invariants (All Verified)
docs/security-audit/(18 module paths verified)executive-summary.html(22<section>, 74<div>, 12<pre>, 5<table>, 48<tr>, etc. — all paired)\``mermaid` / 4 total fences each) and cross-cutting docs"perofrmace"typo preserved verbatim per the governing rule (58 occurrences across all 26 files)## 8. Performance ConsiderationsFileConfigProvider.java,DirectoryConfigProvider.java,JsonDeserializer.java,JsonUtil.java,release.py,RestServer.java,RestServerConfig.java, and all 12 dependency versions ingradle/dependencies.gradleRemaining Work
36 engineering hours remain — all path-to-production activities for audit consumption (committer/PMC review, CVE triage, operator advisory drafting, publishing decision, signed attestation archival). No remediation work is performed or proposed in this PR per the Audit Only rule, which explicitly prohibits code changes even for Critical findings. See
remediation-roadmap.mdfor the phased future-state suggestions that a follow-up KIP campaign could enact.Review Entry Point
Start at
docs/security-audit/README.md→ drill intoseverity-matrix.mdfor the 54-row at-a-glance table → open individual findings underdocs/security-audit/findings/for evidence and reasoning → previewexecutive-summary.htmlviapython3 -m http.server 8000for the leadership briefing.