🛡️ Sentinel: [CRITICAL] Fix predictable and insecure temporary file paths#67
🛡️ Sentinel: [CRITICAL] Fix predictable and insecure temporary file paths#67
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…aths Installation scripts (tools/os_installers/apt.sh) downloaded files to predictable locations (/tmp/yq) or the current working directory, which risks symlink attacks and overwriting existing files, especially when running as `sudo`. Updated logic to use securely generated temporary directories (`mktemp -d`). Co-authored-by: kidchenko <5432753+kidchenko@users.noreply.github.com>
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📝 WalkthroughWalkthroughThe PR addresses a security vulnerability in the installation script by replacing fixed temporary file paths with securely generated random directories. Downloads for Go, yq, lsd, and Composer dependencies are now staged in temporary directories created via Changes
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Actionable comments posted: 1
🧹 Nitpick comments (1)
tools/os_installers/apt.sh (1)
259-270: Consider using a trap to ensure temp directory cleanup on error.The cleanup on line 269 runs unconditionally at block end, which is good. However, if an error occurs between
mktemp -dandrm -rf(e.g., checksum mismatch followed byset -eexit on a later command), the temp directory may remain. This is a minor robustness improvement.♻️ Optional: Use trap for guaranteed cleanup
if ! command -v composer &> /dev/null; then TMP_DIR=$(mktemp -d) + trap 'rm -rf "${TMP_DIR}"' EXIT EXPECTED_CHECKSUM="$(php -r 'copy("https://composer.github.io/installer.sig", "php://stdout");')" php -r "copy('https://getcomposer.org/installer', '${TMP_DIR}/composer-setup.php');" ACTUAL_CHECKSUM="$(php -r "echo hash_file('sha384', '${TMP_DIR}/composer-setup.php');")" if [ "$EXPECTED_CHECKSUM" = "$ACTUAL_CHECKSUM" ]; then sudo php "${TMP_DIR}/composer-setup.php" --quiet --install-dir=/usr/local/bin --filename=composer else >&2 echo 'ERROR: Invalid installer checksum for Composer' fi rm -rf "${TMP_DIR}" + trap - EXIT fiNote: Since
set -eis enabled and the current cleanup happens unconditionally before thefi, this is only a concern if future modifications introduce early exits. The current implementation is acceptable.🤖 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 259 - 270, Wrap TMP_DIR creation and removal with a trap so the temporary directory created by TMP_DIR=$(mktemp -d) is removed even if the script exits early; specifically, after TMP_DIR is assigned (and before downloading composer-setup.php with php -r), register a trap that runs rm -rf "${TMP_DIR}" on EXIT, and ensure any later explicit rm -rf "${TMP_DIR}" is safe (no-op if already removed) and the trap is cleaned up if necessary; this ensures the composer-setup.php download and the checksum check (ACTUAL_CHECKSUM/hash_file and EXPECTED_CHECKSUM) cannot leak the temp dir on errors.
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Inline comments:
In @.jules/sentinel.md:
- Around line 1-4: Change the top-level heading to a single '#' in
.jules/sentinel.md, add a blank line immediately after that heading, and
wrap/reflow the long lines in the body (the lines mentioning the vulnerability,
learning, and prevention) so no line exceeds 80 characters; ensure the three
sections ("Vulnerability:", "Learning:", "Prevention:") remain intact and
readable after rewrapping.
---
Nitpick comments:
In `@tools/os_installers/apt.sh`:
- Around line 259-270: Wrap TMP_DIR creation and removal with a trap so the
temporary directory created by TMP_DIR=$(mktemp -d) is removed even if the
script exits early; specifically, after TMP_DIR is assigned (and before
downloading composer-setup.php with php -r), register a trap that runs rm -rf
"${TMP_DIR}" on EXIT, and ensure any later explicit rm -rf "${TMP_DIR}" is safe
(no-op if already removed) and the trap is cleaned up if necessary; this ensures
the composer-setup.php download and the checksum check
(ACTUAL_CHECKSUM/hash_file and EXPECTED_CHECKSUM) cannot leak the temp dir on
errors.
ℹ️ Review info
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📒 Files selected for processing (2)
.jules/sentinel.mdtools/os_installers/apt.sh
| ## 2024-05-24 - [CRITICAL] Fix predictable and insecure temporary file paths | ||
| **Vulnerability:** Installation scripts (`tools/os_installers/apt.sh`) downloaded files to predictable locations (`/tmp/yq`) or the current working directory, which risks symlink attacks and overwriting existing files, especially when running as `sudo`. | ||
| **Learning:** Using elevated privileges with predictable paths or working directories can lead to local privilege escalation. | ||
| **Prevention:** Always use securely generated random directories like `mktemp -d` to prevent local privilege escalation and symlink attacks. |
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Fix markdown linting errors to pass CI.
The static analysis flagged several issues:
- Line 1: Should be a top-level heading (
#instead of##) per MD041 - Line 1: Needs a blank line after the heading per MD022
- Lines 2-4: Line length exceeds 80 characters per MD013
📝 Proposed fix for markdown linting
-## 2024-05-24 - [CRITICAL] Fix predictable and insecure temporary file paths
-**Vulnerability:** Installation scripts (`tools/os_installers/apt.sh`) downloaded files to predictable locations (`/tmp/yq`) or the current working directory, which risks symlink attacks and overwriting existing files, especially when running as `sudo`.
-**Learning:** Using elevated privileges with predictable paths or working directories can lead to local privilege escalation.
-**Prevention:** Always use securely generated random directories like `mktemp -d` to prevent local privilege escalation and symlink attacks.
+# Sentinel Security Notes
+
+## 2024-05-24 - [CRITICAL] Fix predictable and insecure temporary file paths
+
+**Vulnerability:** Installation scripts (`tools/os_installers/apt.sh`)
+downloaded files to predictable locations (`/tmp/yq`) or the current working
+directory, which risks symlink attacks and overwriting existing files,
+especially when running as `sudo`.
+
+**Learning:** Using elevated privileges with predictable paths or working
+directories can lead to local privilege escalation.
+
+**Prevention:** Always use securely generated random directories like
+`mktemp -d` to prevent local privilege escalation and symlink attacks.📝 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 - [CRITICAL] Fix predictable and insecure temporary file paths | |
| **Vulnerability:** Installation scripts (`tools/os_installers/apt.sh`) downloaded files to predictable locations (`/tmp/yq`) or the current working directory, which risks symlink attacks and overwriting existing files, especially when running as `sudo`. | |
| **Learning:** Using elevated privileges with predictable paths or working directories can lead to local privilege escalation. | |
| **Prevention:** Always use securely generated random directories like `mktemp -d` to prevent local privilege escalation and symlink attacks. | |
| # Sentinel Security Notes | |
| ## 2024-05-24 - [CRITICAL] Fix predictable and insecure temporary file paths | |
| **Vulnerability:** Installation scripts (`tools/os_installers/apt.sh`) | |
| downloaded files to predictable locations (`/tmp/yq`) or the current working | |
| directory, which risks symlink attacks and overwriting existing files, | |
| especially when running as `sudo`. | |
| **Learning:** Using elevated privileges with predictable paths or working | |
| directories can lead to local privilege escalation. | |
| **Prevention:** Always use securely generated random directories like | |
| `mktemp -d` to prevent local privilege escalation and symlink attacks. |
🧰 Tools
🪛 GitHub Check: Lint Documentation
[failure] 4-4: Line length
.jules/sentinel.md:4:81 MD013/line-length Line length [Expected: 80; Actual: 140] 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: 125] 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: 253] 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 - [CRITICAL] Fix..."] 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 - [CRITICAL] Fix predictable and insecure temporary file paths"] 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 top-level heading to a
single '#' in .jules/sentinel.md, add a blank line immediately after that
heading, and wrap/reflow the long lines in the body (the lines mentioning the
vulnerability, learning, and prevention) so no line exceeds 80 characters;
ensure the three sections ("Vulnerability:", "Learning:", "Prevention:") remain
intact and readable after rewrapping.
1 participant
🚨 Severity: CRITICAL
💡 Vulnerability: Installation scripts downloaded files to predictable locations (
/tmp/yq) or the current working directory, which risks symlink attacks and overwriting existing files, especially when running assudo.🎯 Impact: Local privilege escalation. A malicious user could create a symlink at
/tmp/yqpointing to a critical system file, whichsudo mvwould then overwrite. Downloading to the current directory risks overwriting attacker-controlled files.🔧 Fix: Used
mktemp -dto create a securely generated temporary directory with restrictive permissions (0700) to safely download, extract, and move artifacts.✅ Verification: Ran
./build.shto ensure script validation passes. Visually inspectedtools/os_installers/apt.shto confirm proper usage ofmktemp -dand subsequent removal.PR created automatically by Jules for task 8874931659919427575 started by @kidchenko
Summary by CodeRabbit
Bug Fixes
Documentation