🛡️ Sentinel: [CRITICAL] Fix predictable temporary file path vulnerability#74
🛡️ Sentinel: [CRITICAL] Fix predictable temporary file path vulnerability#74
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…lity in apt.sh Replaced hardcoded `/tmp/yq` path with a securely generated directory using `mktemp -d` and proper `trap` cleanup inside a subshell. Also created `.jules/sentinel.md` to document the symlink attack vulnerability. Co-authored-by: kidchenko <5432753+kidchenko@users.noreply.github.com>
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📝 WalkthroughWalkthroughAdds security documentation for a symlink-attack vulnerability in the yq installation script caused by hardcoded Changes
Estimated code review effort🎯 3 (Moderate) | ⏱️ ~20 minutes Poem
🚥 Pre-merge checks | ✅ 3✅ Passed checks (3 passed)
✏️ Tip: You can configure your own custom pre-merge checks in the settings. ✨ Finishing Touches📝 Generate docstrings
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Actionable comments posted: 1
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Inline comments:
In @.jules/sentinel.md:
- Around line 1-4: Change the first line to a top-level H1 (prefix with "# ")
and insert a blank line after it, then reflow/wrap the subsequent lines so they
respect the configured line-length rule and markdown heading-level/spacing
rules; specifically update the heading "2024-05-24 - [Predictable Temporary File
Paths (Symlink Attack)]" to H1 with a blank line, and wrap the Vulnerability,
Learning, and Prevention paragraphs so each is under the H1 and fits the
linter's max line length while preserving the original content and the suggested
mktemp/trap guidance.
🪄 Autofix (Beta)
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
ℹ️ Review info
⚙️ Run configuration
Configuration used: defaults
Review profile: CHILL
Plan: Pro
Run ID: efbd5025-f001-494d-b05c-40543f46ba80
📒 Files selected for processing (2)
.jules/sentinel.mdtools/os_installers/apt.sh
| ## 2024-05-24 - [Predictable Temporary File Paths (Symlink Attack)] | ||
| **Vulnerability:** The script `tools/os_installers/apt.sh` used a hardcoded, predictable temporary file path (`/tmp/yq`) when downloading an executable binary. | ||
| **Learning:** Hardcoding paths in shared directories like `/tmp` makes the system vulnerable to symlink attacks (local privilege escalation or denial of service). An attacker could pre-create a symbolic link at `/tmp/yq` pointing to a sensitive file (e.g., `/etc/passwd`), causing the script running with elevated privileges (e.g., `sudo`) to overwrite or modify the target file. | ||
| **Prevention:** Always use securely generated random directories like `mktemp -d` instead of hardcoded paths in shared directories. When creating secure temporary directories in shell scripts with `mktemp -d`, wrap the logic in a subshell `(...)` and pair it with a local trap (e.g., `trap 'rm -rf "$TMP_DIR"' EXIT`) to ensure automatic cleanup upon exit without affecting or overriding global script traps. No newline at end of file |
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Fix markdownlint failures in heading level/spacing and long lines.
Line 1 should be an H1 with a blank line below, and Lines 2-4 should be wrapped to satisfy the configured line-length rule.
📝 Proposed lint-compliant rewrite
-## 2024-05-24 - [Predictable Temporary File Paths (Symlink Attack)]
-**Vulnerability:** The script `tools/os_installers/apt.sh` used a hardcoded, predictable temporary file path (`/tmp/yq`) when downloading an executable binary.
-**Learning:** Hardcoding paths in shared directories like `/tmp` makes the system vulnerable to symlink attacks (local privilege escalation or denial of service). An attacker could pre-create a symbolic link at `/tmp/yq` pointing to a sensitive file (e.g., `/etc/passwd`), causing the script running with elevated privileges (e.g., `sudo`) to overwrite or modify the target file.
-**Prevention:** Always use securely generated random directories like `mktemp -d` instead of hardcoded paths in shared directories. When creating secure temporary directories in shell scripts with `mktemp -d`, wrap the logic in a subshell `(...)` and pair it with a local trap (e.g., `trap 'rm -rf "$TMP_DIR"' EXIT`) to ensure automatic cleanup upon exit without affecting or overriding global script traps.
+# 2024-05-24 - [Predictable Temporary File Paths (Symlink Attack)]
+
+**Vulnerability:** The script `tools/os_installers/apt.sh` used a hardcoded,
+predictable temporary file path (`/tmp/yq`) when downloading an executable
+binary.
+
+**Learning:** Hardcoding paths in shared directories like `/tmp` makes the
+system vulnerable to symlink attacks (local privilege escalation or denial of
+service). An attacker could pre-create a symbolic link at `/tmp/yq` pointing to
+a sensitive file (e.g., `/etc/passwd`), causing the script running with elevated
+privileges (e.g., `sudo`) to overwrite or modify the target file.
+
+**Prevention:** Always use securely generated random directories like
+`mktemp -d` instead of hardcoded paths in shared directories. When creating
+secure temporary directories in shell scripts with `mktemp -d`, wrap the logic
+in a subshell `(...)` and pair it with a local trap
+(e.g., `trap 'rm -rf "$TMP_DIR"' EXIT`) to ensure automatic cleanup upon exit
+without affecting or overriding global script traps.🧰 Tools
🪛 GitHub Check: Lint Documentation
[failure] 4-4: Line length
.jules/sentinel.md:4:81 MD013/line-length Line length [Expected: 80; Actual: 407] https://github.com/DavidAnson/markdownlint/blob/v0.34.0/doc/md013.md
[failure] 3-3: Line length
.jules/sentinel.md:3:81 MD013/line-length Line length [Expected: 80; Actual: 379] https://github.com/DavidAnson/markdownlint/blob/v0.34.0/doc/md013.md
[failure] 2-2: Line length
.jules/sentinel.md:2:81 MD013/line-length Line length [Expected: 80; Actual: 159] https://github.com/DavidAnson/markdownlint/blob/v0.34.0/doc/md013.md
[failure] 1-1: First line in a file should be a top-level heading
.jules/sentinel.md:1 MD041/first-line-heading/first-line-h1 First line in a file should be a top-level heading [Context: "## 2024-05-24 - [Predictable T..."] https://github.com/DavidAnson/markdownlint/blob/v0.34.0/doc/md041.md
[failure] 1-1: Headings should be surrounded by blank lines
.jules/sentinel.md:1 MD022/blanks-around-headings Headings should be surrounded by blank lines [Expected: 1; Actual: 0; Below] [Context: "## 2024-05-24 - [Predictable Temporary File Paths (Symlink Attack)]"] https://github.com/DavidAnson/markdownlint/blob/v0.34.0/doc/md022.md
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.
In @.jules/sentinel.md around lines 1 - 4, Change the first line to a top-level
H1 (prefix with "# ") and insert a blank line after it, then reflow/wrap the
subsequent lines so they respect the configured line-length rule and markdown
heading-level/spacing rules; specifically update the heading "2024-05-24 -
[Predictable Temporary File Paths (Symlink Attack)]" to H1 with a blank line,
and wrap the Vulnerability, Learning, and Prevention paragraphs so each is under
the H1 and fits the linter's max line length while preserving the original
content and the suggested mktemp/trap guidance.
1 participant
🚨 Severity: CRITICAL
💡 Vulnerability: Predictable Temporary File Path (Symlink Attack). The
tools/os_installers/apt.shscript used a hardcoded, predictable temporary file path (/tmp/yq) when downloading theyqbinary. Hardcoding paths in shared directories like/tmpmakes the system vulnerable to symlink attacks.🎯 Impact: An attacker could pre-create a symbolic link at
/tmp/yqpointing to a sensitive file (e.g.,/etc/passwd). When the script runs with elevated privileges (sudo mv ...), it could overwrite or modify the target file, leading to local privilege escalation or a denial of service.🔧 Fix: Replaced the hardcoded
/tmp/yqpath with a securely generated random directory usingmktemp -d. The download and move logic is wrapped in a subshell(...)and paired with a localtrap 'rm -rf "$TMP_DIR"' EXITto ensure automatic cleanup upon exit without affecting global script traps. Also recorded this finding in.jules/sentinel.md.✅ Verification:
tools/os_installers/apt.shto ensure/tmp/yqis no longer used and is replaced bymktemp -d../build.sh syntaxand./build.sh lintto verify the script is valid..jules/sentinel.mdfor the documented learning.PR created automatically by Jules for task 6281568317492694477 started by @kidchenko
Summary by CodeRabbit
Bug Fixes
Documentation