🛡️ Sentinel: [CRITICAL] Fix Insecure Temporary File Vulnerability#72
🛡️ Sentinel: [CRITICAL] Fix Insecure Temporary File Vulnerability#72
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Replaced the hardcoded, predictable temporary file path (`/tmp/yq`) in `tools/os_installers/apt.sh` with a securely generated temporary directory using `mktemp -d`. This prevents local privilege escalation (LPE) and symlink (TOCTOU) attacks when downloading and executing the `yq` binary with `sudo`. Also added a trap to ensure automatic cleanup upon script exit. Co-authored-by: kidchenko <5432753+kidchenko@users.noreply.github.com>
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📝 WalkthroughWalkthroughAdded security documentation for a local privilege escalation vulnerability in installation scripts. Updated the apt installer to use securely generated temporary directories via Changes
Estimated code review effort🎯 2 (Simple) | ⏱️ ~12 minutes Poem
🚥 Pre-merge checks | ✅ 3✅ Passed checks (3 passed)
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🧪 Generate unit tests (beta)
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Actionable comments posted: 1
🧹 Nitpick comments (1)
tools/os_installers/apt.sh (1)
207-211: Consider using similar secure temp directory pattern for other downloads.The Go and lsd installers download files directly to the current working directory. While this is less risky than
/tmp(since the current directory isn't world-writable), using the samemktemp -dpattern would provide defense-in-depth. This is a lower priority since these downloads don't use predictable paths in shared directories.🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@tools/os_installers/apt.sh` around lines 207 - 211, Create and use a secure temporary directory for the Go download instead of writing into the current directory: call mktemp -d to produce a tempdir, download the "go${GO_VERSION}.linux-amd64.tar.gz" into that tempdir (use the GO_VERSION symbol to build the filename), run sudo tar -C /usr/local -xzf against the file in the tempdir, then remove the tempdir (cleanup) after extraction; apply the same mktemp -d pattern to the lsd installer download logic so both wget/rm operations use an isolated temporary directory rather than the repository working directory.
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Inline comments:
In @.jules/sentinel.md:
- Around line 1-4: Change the first line to a top-level heading by replacing "##
2024-05-24 - [Local Privilege Escalation in Installation Scripts]" with "#
2024-05-24 - [Local Privilege Escalation in Installation Scripts]" and add a
blank line immediately after the heading; then wrap or reflow the subsequent
lines describing the vulnerability, learning, and prevention (the lines
mentioning "/tmp/yq", "mktemp -d", and the trap example) so no line exceeds 80
characters and ensure code snippets are fenced as a markdown code block.
---
Nitpick comments:
In `@tools/os_installers/apt.sh`:
- Around line 207-211: Create and use a secure temporary directory for the Go
download instead of writing into the current directory: call mktemp -d to
produce a tempdir, download the "go${GO_VERSION}.linux-amd64.tar.gz" into that
tempdir (use the GO_VERSION symbol to build the filename), run sudo tar -C
/usr/local -xzf against the file in the tempdir, then remove the tempdir
(cleanup) after extraction; apply the same mktemp -d pattern to the lsd
installer download logic so both wget/rm operations use an isolated temporary
directory rather than the repository working directory.
🪄 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: a739cc88-41d8-493d-a116-44ce06b03667
📒 Files selected for processing (2)
.jules/sentinel.mdtools/os_installers/apt.sh
| ## 2024-05-24 - [Local Privilege Escalation in Installation Scripts] | ||
| **Vulnerability:** Predictable temporary file paths (`/tmp/yq`) used during downloading executables, which were then processed with `sudo`. | ||
| **Learning:** Hardcoding shared temporary directories (`/tmp`) allows local attackers to pre-create files or symlinks (TOCTOU attacks). This is especially critical when combined with `sudo` execution. | ||
| **Prevention:** Always use securely generated, random temporary directories created by `mktemp -d` and paired with an `EXIT` trap for automated cleanup (e.g., `YQ_TMP_DIR=$(mktemp -d); trap "rm -rf '$YQ_TMP_DIR'" EXIT`). |
There was a problem hiding this comment.
Fix markdown lint failures to pass CI.
The static analysis flagged several formatting issues:
- Line 1: First line should be a top-level heading (
#instead of##) - Line 1: Missing blank line after heading
- Lines 2-4: Line length exceeds 80 characters
📝 Proposed fix for markdown formatting
-## 2024-05-24 - [Local Privilege Escalation in Installation Scripts]
-**Vulnerability:** Predictable temporary file paths (`/tmp/yq`) used during downloading executables, which were then processed with `sudo`.
-**Learning:** Hardcoding shared temporary directories (`/tmp`) allows local attackers to pre-create files or symlinks (TOCTOU attacks). This is especially critical when combined with `sudo` execution.
-**Prevention:** Always use securely generated, random temporary directories created by `mktemp -d` and paired with an `EXIT` trap for automated cleanup (e.g., `YQ_TMP_DIR=$(mktemp -d); trap "rm -rf '$YQ_TMP_DIR'" EXIT`).
+# Sentinel Security Notes
+
+## 2024-05-24 - Local Privilege Escalation in Installation Scripts
+
+**Vulnerability:** Predictable temporary file paths (`/tmp/yq`) used during
+downloading executables, which were then processed with `sudo`.
+
+**Learning:** Hardcoding shared temporary directories (`/tmp`) allows local
+attackers to pre-create files or symlinks (TOCTOU attacks). This is especially
+critical when combined with `sudo` execution.
+
+**Prevention:** Always use securely generated, random temporary directories
+created by `mktemp -d` and paired with an `EXIT` trap for automated cleanup:
+
+```bash
+YQ_TMP_DIR=$(mktemp -d)
+trap "rm -rf '$YQ_TMP_DIR'" EXIT
+```📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| ## 2024-05-24 - [Local Privilege Escalation in Installation Scripts] | |
| **Vulnerability:** Predictable temporary file paths (`/tmp/yq`) used during downloading executables, which were then processed with `sudo`. | |
| **Learning:** Hardcoding shared temporary directories (`/tmp`) allows local attackers to pre-create files or symlinks (TOCTOU attacks). This is especially critical when combined with `sudo` execution. | |
| **Prevention:** Always use securely generated, random temporary directories created by `mktemp -d` and paired with an `EXIT` trap for automated cleanup (e.g., `YQ_TMP_DIR=$(mktemp -d); trap "rm -rf '$YQ_TMP_DIR'" EXIT`). | |
| # Sentinel Security Notes | |
| ## 2024-05-24 - Local Privilege Escalation in Installation Scripts | |
| **Vulnerability:** Predictable temporary file paths (`/tmp/yq`) used during | |
| downloading executables, which were then processed with `sudo`. | |
| **Learning:** Hardcoding shared temporary directories (`/tmp`) allows local | |
| attackers to pre-create files or symlinks (TOCTOU attacks). This is especially | |
| critical when combined with `sudo` execution. | |
| **Prevention:** Always use securely generated, random temporary directories | |
| created by `mktemp -d` and paired with an `EXIT` trap for automated cleanup: | |
🧰 Tools
🪛 GitHub Check: Lint Documentation
[failure] 4-4: Line length
.jules/sentinel.md:4:81 MD013/line-length Line length [Expected: 80; Actual: 220] 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: 200] 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: 139] 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 - [Local Privile..."] 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 - [Local Privilege Escalation in Installation Scripts]"] 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
heading by replacing "## 2024-05-24 - [Local Privilege Escalation in
Installation Scripts]" with "# 2024-05-24 - [Local Privilege Escalation in
Installation Scripts]" and add a blank line immediately after the heading; then
wrap or reflow the subsequent lines describing the vulnerability, learning, and
prevention (the lines mentioning "/tmp/yq", "mktemp -d", and the trap example)
so no line exceeds 80 characters and ensure code snippets are fenced as a
markdown code block.
1 participant
🚨 Severity: CRITICAL
💡 Vulnerability: Insecure Temporary File (CWE-377). The installation script used a predictable path (
/tmp/yq) to download an executable, which was subsequently moved withsudoprivileges. A local attacker could pre-create this file or symlink to escalate privileges or overwrite arbitrary system files (TOCTOU attack).🎯 Impact: Local Privilege Escalation (LPE) or arbitrary file overwrite by any local user during the execution of the
apt.shinstallation script.🔧 Fix: Replaced the hardcoded
/tmp/yqpath with a securely generated, restricted temporary directory usingmktemp -d. Implemented anEXITtrap to guarantee cleanup of the temporary directory when the script finishes.✅ Verification: Verified that
tools/os_installers/apt.shsecurely creates a directory withmktemp -dand utilizes theEXITtrap. The updated syntax was successfully validated viashellcheck(run through./build.sh lint).PR created automatically by Jules for task 2902433558536863833 started by @kidchenko
Summary by CodeRabbit
Release Notes
Bug Fixes
Documentation