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An Improper Validation of Specified Quantity in Input...

Moderate severity Unreviewed Published Oct 13, 2023 to the GitHub Advisory Database • Updated Apr 4, 2024

Package

No package listedSuggest a package

Affected versions

Unknown

Patched versions

Unknown

Description

An Improper Validation of Specified Quantity in Input vulnerability in the Layer-2 control protocols daemon (l2cpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker who sends specific LLDP packets to cause a Denial of Service(DoS).

This issue occurs when specific LLDP packets are received and telemetry polling is being done on the device. The impact of the l2cpd crash is reinitialization of STP protocols (RSTP, MSTP or VSTP), and MVRP and ERP. Also, if any services depend on LLDP state (like PoE or VoIP device recognition), then these will also be affected.

This issue affects:

Juniper Networks Junos OS

  • All versions prior to 20.4R3-S8;
  • 21.1 version 21.1R1 and later versions;
  • 21.2 versions prior to 21.2R3-S5;
  • 21.3 versions prior to 21.3R3-S4;
  • 21.4 versions prior to 21.4R3-S3;
  • 22.1 versions prior to 22.1R3-S2;
  • 22.2 versions prior to 22.2R3;
  • 22.3 versions prior to 22.3R2-S2;
  • 22.4 versions prior to 22.4R2;

Juniper Networks Junos OS Evolved

  • All versions prior to 20.4R3-S8-EVO;
  • 21.1 version 21.1R1-EVO and later versions;
  • 21.2 versions prior to 21.2R3-S5-EVO;
  • 21.3 versions prior to 21.3R3-S4-EVO;
  • 21.4 versions prior to 21.4R3-S3-EVO;
  • 22.1 versions prior to 22.1R3-S2-EVO;
  • 22.2 versions prior to 22.2R3-EVO;
  • 22.3 versions prior to 22.3R2-S2-EVO;
  • 22.4 versions prior to 22.4R1-S1-EVO;

References

Published by the National Vulnerability Database Oct 12, 2023
Published to the GitHub Advisory Database Oct 13, 2023
Last updated Apr 4, 2024

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Adjacent
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS score

0.044%
(14th percentile)

Weaknesses

CVE ID

CVE-2023-36839

GHSA ID

GHSA-wr6j-q48c-hx4c

Source code

No known source code

Dependabot alerts are not supported on this advisory because it does not have a package from a supported ecosystem with an affected and fixed version.

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