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Java: Fix Local Temp File/Dir Incorrect Guard Logic
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Resolves #8032 (comment)
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@JLLeitschuh
JLLeitschuh committed Apr 6, 2022
1 parent 879b8a1 commit e65d4c0
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Showing 6 changed files with 58 additions and 39 deletions.
10 changes: 5 additions & 5 deletions java/ql/lib/semmle/code/java/os/OSCheck.qll
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Original file line number Diff line number Diff line change
Expand Up @@ -112,23 +112,23 @@ private predicate isOsFromApacheCommons(FieldAccess fa, string fieldNamePattern)
}

private class IsWindowsFromApacheCommons extends IsWindowsGuard instanceof FieldAccess {
IsWindowsFromApacheCommons() { isOsFromApacheCommons(this, "IS_OS_WINDOWS") }
IsWindowsFromApacheCommons() { isOsFromApacheCommons(this, "IS\\_OS\\_WINDOWS") }
}

private class IsSpecificWindowsVariantFromApacheCommons extends IsSpecificWindowsVariant instanceof FieldAccess {
IsSpecificWindowsVariantFromApacheCommons() { isOsFromApacheCommons(this, "IS_OS_WINDOWS_%") }
IsSpecificWindowsVariantFromApacheCommons() { isOsFromApacheCommons(this, "IS\\_OS\\_WINDOWS\\_%") }
}

private class IsUnixFromApacheCommons extends IsUnixGuard instanceof FieldAccess {
IsUnixFromApacheCommons() { isOsFromApacheCommons(this, "IS_OS_UNIX") }
IsUnixFromApacheCommons() { isOsFromApacheCommons(this, "IS\\_OS\\_UNIX") }
}

private class IsSpecificUnixVariantFromApacheCommons extends IsSpecificUnixVariant instanceof FieldAccess {
IsSpecificUnixVariantFromApacheCommons() {
isOsFromApacheCommons(this,
[
"IS_OS_AIX", "IS_OS_HP_UX", "IS_OS_IRIX", "IS_OS_LINUX", "IS_OS_MAC%", "IS_OS_FREE_BSD",
"IS_OS_OPEN_BSD", "IS_OS_NET_BSD", "IS_OS_SOLARIS", "IS_OS_SUN_OS", "IS_OS_ZOS"
"IS\\_OS\\_AIX", "IS\\_OS\\_HP\\_UX", "IS\\_OS\\_IRIX", "IS\\_OS\\_LINUX", "IS\\_OS\\_MAC%", "IS\\_OS\\_FREE\\_BSD",
"IS\\_OS\\_OPEN\\_BSD", "IS\\_OS\\_NET\\_BSD", "IS\\_OS\\_SOLARIS", "IS\\_OS\\_SUN\\_OS", "IS\\_OS\\_ZOS"
])
}
}
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26 changes: 11 additions & 15 deletions java/ql/src/Security/CWE/CWE-200/TempDirLocalInformationDisclosure.ql
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Original file line number Diff line number Diff line change
Expand Up @@ -105,23 +105,21 @@ private class FileCreateTempFileSink extends FileCreationSink {
}

/**
* A guard that holds when the program is definitely running under some version of Windows.
* A santizier that holds when the program is definitely running under some version of Windows.
*/
abstract private class WindowsOsBarrierGuard extends DataFlow::BarrierGuard { }
abstract private class WindowsOsSanitizer extends DataFlow::Node { }

private class IsNotUnixBarrierGuard extends WindowsOsBarrierGuard instanceof IsUnixGuard {
override predicate checks(Expr e, boolean branch) {
this.controls(e.getBasicBlock(), branch.booleanNot())
}
private class IsNotUnixSanitizer extends WindowsOsSanitizer {
IsNotUnixSanitizer() { any(IsUnixGuard guard).controls(this.asExpr().getBasicBlock(), false) }
}

private class IsWindowsBarrierGuard extends WindowsOsBarrierGuard instanceof IsWindowsGuard {
override predicate checks(Expr e, boolean branch) { this.controls(e.getBasicBlock(), branch) }
private class IsWindowsSanitizer extends WindowsOsSanitizer {
IsWindowsSanitizer() { any(IsWindowsGuard guard).controls(this.asExpr().getBasicBlock(), true) }
}

private class IsSpecificWindowsBarrierGuard extends WindowsOsBarrierGuard instanceof IsSpecificWindowsVariant {
override predicate checks(Expr e, boolean branch) {
branch = true and this.controls(e.getBasicBlock(), branch)
private class IsSpecificWindowsSanitizer extends WindowsOsSanitizer {
IsSpecificWindowsSanitizer() {
any(IsSpecificWindowsVariant guard).controls(this.asExpr().getBasicBlock(), true)
}
}

Expand Down Expand Up @@ -155,10 +153,8 @@ private class TempDirSystemGetPropertyToCreateConfig extends TaintTracking::Conf
exists(FilesSanitizingCreationMethodAccess sanitisingMethodAccess |
sanitizer.asExpr() = sanitisingMethodAccess.getArgument(0)
)
}

override predicate isSanitizerGuard(DataFlow::BarrierGuard guard) {
guard instanceof WindowsOsBarrierGuard
or
sanitizer instanceof WindowsOsSanitizer
}
}

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1 change: 0 additions & 1 deletion java/ql/src/Security/CWE/CWE-200/TempDirUtils.qll
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Original file line number Diff line number Diff line change
Expand Up @@ -58,7 +58,6 @@ private predicate isTaintPropagatingFileTransformation(Expr expSource, Expr expr
* For example, `taintedFile.getCanonicalFile()` is itself tainted.
*/
predicate isAdditionalFileTaintStep(DataFlow::Node node1, DataFlow::Node node2) {
isFileConstructorArgument(node1.asExpr(), node2.asExpr(), _) or
isTaintPropagatingFileTransformation(node1.asExpr(), node2.asExpr())
}

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4 changes: 4 additions & 0 deletions java/ql/src/change-notes/2022-04-06-local-temp-file-or-directory-bugfix.md
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@@ -0,0 +1,4 @@
---
category: minorAnalysis
---
* Fixed "Local information disclosure in a temporary directory" (`java/local-temp-file-or-directory-information-disclosure`) to resolve false-negatives when OS isn't properly used as logical guard.
34 changes: 16 additions & 18 deletions ...test/query-tests/security/CWE-200/semmle/tests/TempDirLocalInformationDisclosure.expected
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Original file line number Diff line number Diff line change
@@ -1,38 +1,26 @@
edges
| Files.java:10:24:10:69 | new File(...) : File | Files.java:14:37:14:43 | baseDir : File |
| Files.java:10:24:10:69 | new File(...) : File | Files.java:15:17:15:23 | tempDir |
| Files.java:10:33:10:68 | getProperty(...) : String | Files.java:10:24:10:69 | new File(...) : File |
| Files.java:10:33:10:68 | getProperty(...) : String | Files.java:14:37:14:43 | baseDir : File |
| Files.java:10:33:10:68 | getProperty(...) : String | Files.java:15:17:15:23 | tempDir |
| Files.java:14:28:14:64 | new File(...) : File | Files.java:15:17:15:23 | tempDir |
| Files.java:14:37:14:43 | baseDir : File | Files.java:14:28:14:64 | new File(...) : File |
| Test.java:36:24:36:69 | new File(...) : File | Test.java:39:63:39:69 | tempDir |
| Test.java:36:33:36:68 | getProperty(...) : String | Test.java:36:24:36:69 | new File(...) : File |
| Test.java:36:33:36:68 | getProperty(...) : String | Test.java:39:63:39:69 | tempDir |
| Test.java:50:29:50:94 | new File(...) : File | Test.java:53:63:53:74 | tempDirChild |
| Test.java:50:38:50:83 | new File(...) : File | Test.java:50:29:50:94 | new File(...) : File |
| Test.java:50:38:50:83 | new File(...) : File | Test.java:53:63:53:74 | tempDirChild |
| Test.java:50:47:50:82 | getProperty(...) : String | Test.java:50:38:50:83 | new File(...) : File |
| Test.java:50:47:50:82 | getProperty(...) : String | Test.java:53:63:53:74 | tempDirChild |
| Test.java:61:24:61:69 | new File(...) : File | Test.java:64:63:64:69 | tempDir |
| Test.java:61:33:61:68 | getProperty(...) : String | Test.java:61:24:61:69 | new File(...) : File |
| Test.java:61:33:61:68 | getProperty(...) : String | Test.java:64:63:64:69 | tempDir |
| Test.java:75:24:75:69 | new File(...) : File | Test.java:78:63:78:69 | tempDir |
| Test.java:75:33:75:68 | getProperty(...) : String | Test.java:75:24:75:69 | new File(...) : File |
| Test.java:75:33:75:68 | getProperty(...) : String | Test.java:78:63:78:69 | tempDir |
| Test.java:110:29:110:84 | new File(...) : File | Test.java:113:9:113:20 | tempDirChild |
| Test.java:110:38:110:73 | getProperty(...) : String | Test.java:110:29:110:84 | new File(...) : File |
| Test.java:110:38:110:73 | getProperty(...) : String | Test.java:113:9:113:20 | tempDirChild |
| Test.java:134:29:134:84 | new File(...) : File | Test.java:137:9:137:20 | tempDirChild |
| Test.java:134:38:134:73 | getProperty(...) : String | Test.java:134:29:134:84 | new File(...) : File |
| Test.java:134:38:134:73 | getProperty(...) : String | Test.java:137:9:137:20 | tempDirChild |
| Test.java:158:29:158:88 | new File(...) : File | Test.java:159:21:159:32 | tempDirChild : File |
| Test.java:158:38:158:73 | getProperty(...) : String | Test.java:158:29:158:88 | new File(...) : File |
| Test.java:158:38:158:73 | getProperty(...) : String | Test.java:159:21:159:32 | tempDirChild : File |
| Test.java:159:21:159:32 | tempDirChild : File | Test.java:159:21:159:41 | toPath(...) |
| Test.java:187:29:187:88 | new File(...) : File | Test.java:188:21:188:32 | tempDirChild : File |
| Test.java:187:38:187:73 | getProperty(...) : String | Test.java:187:29:187:88 | new File(...) : File |
| Test.java:187:38:187:73 | getProperty(...) : String | Test.java:188:21:188:32 | tempDirChild : File |
| Test.java:188:21:188:32 | tempDirChild : File | Test.java:188:21:188:41 | toPath(...) |
| Test.java:204:29:204:104 | new File(...) : File | Test.java:204:29:204:113 | toPath(...) : Path |
| Test.java:204:29:204:113 | toPath(...) : Path | Test.java:207:33:207:44 | tempDirChild |
Expand All @@ -42,28 +30,28 @@ edges
| Test.java:216:38:216:73 | getProperty(...) : String | Test.java:216:29:216:102 | new File(...) : File |
| Test.java:228:29:228:100 | new File(...) : File | Test.java:231:26:231:37 | tempDirChild : File |
| Test.java:228:38:228:73 | getProperty(...) : String | Test.java:228:29:228:100 | new File(...) : File |
| Test.java:228:38:228:73 | getProperty(...) : String | Test.java:231:26:231:37 | tempDirChild : File |
| Test.java:231:26:231:37 | tempDirChild : File | Test.java:231:26:231:46 | toPath(...) |
| Test.java:249:29:249:101 | new File(...) : File | Test.java:252:31:252:42 | tempDirChild : File |
| Test.java:249:38:249:73 | getProperty(...) : String | Test.java:249:29:249:101 | new File(...) : File |
| Test.java:249:38:249:73 | getProperty(...) : String | Test.java:252:31:252:42 | tempDirChild : File |
| Test.java:252:31:252:42 | tempDirChild : File | Test.java:252:31:252:51 | toPath(...) |
| Test.java:260:29:260:109 | new File(...) : File | Test.java:263:33:263:44 | tempDirChild : File |
| Test.java:260:38:260:73 | getProperty(...) : String | Test.java:260:29:260:109 | new File(...) : File |
| Test.java:260:38:260:73 | getProperty(...) : String | Test.java:263:33:263:44 | tempDirChild : File |
| Test.java:263:33:263:44 | tempDirChild : File | Test.java:263:33:263:53 | toPath(...) |
| Test.java:294:29:294:101 | new File(...) : File | Test.java:298:35:298:46 | tempDirChild : File |
| Test.java:294:38:294:73 | getProperty(...) : String | Test.java:294:29:294:101 | new File(...) : File |
| Test.java:294:38:294:73 | getProperty(...) : String | Test.java:298:35:298:46 | tempDirChild : File |
| Test.java:298:35:298:46 | tempDirChild : File | Test.java:298:35:298:55 | toPath(...) |
| Test.java:313:29:313:101 | new File(...) : File | Test.java:316:35:316:46 | tempDirChild : File |
| Test.java:313:38:313:73 | getProperty(...) : String | Test.java:313:29:313:101 | new File(...) : File |
| Test.java:313:38:313:73 | getProperty(...) : String | Test.java:316:35:316:46 | tempDirChild : File |
| Test.java:316:35:316:46 | tempDirChild : File | Test.java:316:35:316:55 | toPath(...) |
| Test.java:322:29:322:101 | new File(...) : File | Test.java:326:35:326:46 | tempDirChild : File |
| Test.java:322:38:322:73 | getProperty(...) : String | Test.java:322:29:322:101 | new File(...) : File |
| Test.java:322:38:322:73 | getProperty(...) : String | Test.java:326:35:326:46 | tempDirChild : File |
| Test.java:326:35:326:46 | tempDirChild : File | Test.java:326:35:326:55 | toPath(...) |
| Test.java:350:29:350:101 | new File(...) : File | Test.java:355:35:355:46 | tempDirChild : File |
| Test.java:350:38:350:73 | getProperty(...) : String | Test.java:350:29:350:101 | new File(...) : File |
| Test.java:355:35:355:46 | tempDirChild : File | Test.java:355:35:355:55 | toPath(...) |
| Test.java:361:29:361:101 | new File(...) : File | Test.java:366:35:366:46 | tempDirChild : File |
| Test.java:361:38:361:73 | getProperty(...) : String | Test.java:361:29:361:101 | new File(...) : File |
| Test.java:366:35:366:46 | tempDirChild : File | Test.java:366:35:366:55 | toPath(...) |
nodes
| Files.java:10:24:10:69 | new File(...) : File | semmle.label | new File(...) : File |
| Files.java:10:33:10:68 | getProperty(...) : String | semmle.label | getProperty(...) : String |
Expand Down Expand Up @@ -133,6 +121,14 @@ nodes
| Test.java:322:38:322:73 | getProperty(...) : String | semmle.label | getProperty(...) : String |
| Test.java:326:35:326:46 | tempDirChild : File | semmle.label | tempDirChild : File |
| Test.java:326:35:326:55 | toPath(...) | semmle.label | toPath(...) |
| Test.java:350:29:350:101 | new File(...) : File | semmle.label | new File(...) : File |
| Test.java:350:38:350:73 | getProperty(...) : String | semmle.label | getProperty(...) : String |
| Test.java:355:35:355:46 | tempDirChild : File | semmle.label | tempDirChild : File |
| Test.java:355:35:355:55 | toPath(...) | semmle.label | toPath(...) |
| Test.java:361:29:361:101 | new File(...) : File | semmle.label | new File(...) : File |
| Test.java:361:38:361:73 | getProperty(...) : String | semmle.label | getProperty(...) : String |
| Test.java:366:35:366:46 | tempDirChild : File | semmle.label | tempDirChild : File |
| Test.java:366:35:366:55 | toPath(...) | semmle.label | toPath(...) |
subpaths
#select
| Files.java:10:33:10:68 | getProperty(...) | Files.java:10:33:10:68 | getProperty(...) : String | Files.java:15:17:15:23 | tempDir | Local information disclosure vulnerability from $@ due to use of file or directory readable by other local users. | Files.java:10:33:10:68 | getProperty(...) | system temp directory |
Expand All @@ -155,3 +151,5 @@ subpaths
| Test.java:294:38:294:73 | getProperty(...) | Test.java:294:38:294:73 | getProperty(...) : String | Test.java:298:35:298:55 | toPath(...) | Local information disclosure vulnerability from $@ due to use of file or directory readable by other local users. | Test.java:294:38:294:73 | getProperty(...) | system temp directory |
| Test.java:313:38:313:73 | getProperty(...) | Test.java:313:38:313:73 | getProperty(...) : String | Test.java:316:35:316:55 | toPath(...) | Local information disclosure vulnerability from $@ due to use of file or directory readable by other local users. | Test.java:313:38:313:73 | getProperty(...) | system temp directory |
| Test.java:322:38:322:73 | getProperty(...) | Test.java:322:38:322:73 | getProperty(...) : String | Test.java:326:35:326:55 | toPath(...) | Local information disclosure vulnerability from $@ due to use of file or directory readable by other local users. | Test.java:322:38:322:73 | getProperty(...) | system temp directory |
| Test.java:350:38:350:73 | getProperty(...) | Test.java:350:38:350:73 | getProperty(...) : String | Test.java:355:35:355:55 | toPath(...) | Local information disclosure vulnerability from $@ due to use of file or directory readable by other local users. | Test.java:350:38:350:73 | getProperty(...) | system temp directory |
| Test.java:361:38:361:73 | getProperty(...) | Test.java:361:38:361:73 | getProperty(...) : String | Test.java:366:35:366:55 | toPath(...) | Local information disclosure vulnerability from $@ due to use of file or directory readable by other local users. | Test.java:361:38:361:73 | getProperty(...) | system temp directory |
22 changes: 22 additions & 0 deletions java/ql/test/query-tests/security/CWE-200/semmle/tests/Test.java
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Original file line number Diff line number Diff line change
Expand Up @@ -344,4 +344,26 @@ void safeBecauseInvertedFileSeperatorCheck() throws IOException {
Files.createDirectory(tempDirChild.toPath());
}
}

void vulnerableBecauseFileSeparatorCheckElseCase() throws IOException {
// GIVEN:
File tempDirChild = new File(System.getProperty("java.io.tmpdir"), "/child-create-directory");

if (File.separatorChar == '\\') {
Files.createDirectory(tempDirChild.toPath()); // Safe
} else {
Files.createDirectory(tempDirChild.toPath()); // Vulnerable
}
}

void vulnerableBecauseInvertedFileSeperatorCheckElseCase() throws IOException {
// GIVEN:
File tempDirChild = new File(System.getProperty("java.io.tmpdir"), "/child-create-directory");

if (File.separatorChar != '/') {
Files.createDirectory(tempDirChild.toPath()); // Safe
} else {
Files.createDirectory(tempDirChild.toPath()); // Vulnerable
}
}
}

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