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Creates a secure temporary directory (`mktemp -d`) for downloading utilities like Go, yq, and lsd instead of using the current working directory or predictable paths like `/tmp/yq`, preventing symlink attacks and unintended file overwriting. Co-authored-by: kidchenko <5432753+kidchenko@users.noreply.github.com>
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📝 WalkthroughWalkthroughAdded security documentation for download-path vulnerabilities in shell scripts, and refactored an OS installer script to download artifacts into secure temporary directories instead of predictable paths, applying 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)
212-215: Downloads now staged in secure temp directory.The security fix is correct. Note that the explicit
rmon line 215 is technically redundant since the EXIT trap will clean up$TMP_DIRentirely. The same applies to lines 249, 265, and 268. This "belt-and-suspenders" approach is harmless and can be left as-is for explicit cleanup, or simplified by removing the individualrmcalls.♻️ Optional: Remove redundant cleanup calls
wget "https://go.dev/dl/go${GO_VERSION}.linux-amd64.tar.gz" -O "$TMP_DIR/go${GO_VERSION}.linux-amd64.tar.gz" sudo rm -rf /usr/local/go sudo tar -C /usr/local -xzf "$TMP_DIR/go${GO_VERSION}.linux-amd64.tar.gz" - rm "$TMP_DIR/go${GO_VERSION}.linux-amd64.tar.gz" echo "NOTE: Add 'export PATH=\$PATH:/usr/local/go/bin' to your shell profile" fiSimilar changes can be applied for lsd (line 249) and composer (lines 265, 268).
🤖 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 212 - 215, The explicit per-download rm calls (e.g., removing "$TMP_DIR/go${GO_VERSION}.linux-amd64.tar.gz" after the wget/tar sequence that uses TMP_DIR) are redundant because the EXIT trap already cleans up $TMP_DIR; either remove those individual rm lines (the rm after the go tarball and the similar rm calls for lsd and composer) to simplify the script, or keep them if you prefer explicit inline cleanup—locate the wget/tar/rm sequences that reference "$TMP_DIR" (e.g., the go download block using GO_VERSION and "$TMP_DIR/go${GO_VERSION}.linux-amd64.tar.gz" and the lsd/composer download blocks) and delete the standalone rm commands there.
🤖 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: Add a top-level heading at the top of the file by turning the
existing heading "2024-05-18 - [Secure Temp Downloads in Setup Scripts]" into a
H1 (prefix it accordingly), insert a blank line immediately after that H1, and
reflow lines 2–4 so no line exceeds 80 characters (break long sentences and keep
command examples as fenced code blocks or indented code blocks) to satisfy
MD041, MD022 and MD013 lint rules; ensure any inline commands or paths remain
properly escaped/monospaced in the markdown.
---
Nitpick comments:
In `@tools/os_installers/apt.sh`:
- Around line 212-215: The explicit per-download rm calls (e.g., removing
"$TMP_DIR/go${GO_VERSION}.linux-amd64.tar.gz" after the wget/tar sequence that
uses TMP_DIR) are redundant because the EXIT trap already cleans up $TMP_DIR;
either remove those individual rm lines (the rm after the go tarball and the
similar rm calls for lsd and composer) to simplify the script, or keep them if
you prefer explicit inline cleanup—locate the wget/tar/rm sequences that
reference "$TMP_DIR" (e.g., the go download block using GO_VERSION and
"$TMP_DIR/go${GO_VERSION}.linux-amd64.tar.gz" and the lsd/composer download
blocks) and delete the standalone rm commands there.
🪄 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: f793e4bd-d2a4-4786-9ade-f2bc755410c4
📒 Files selected for processing (2)
.jules/sentinel.mdtools/os_installers/apt.sh
| ## 2024-05-18 - [Secure Temp Downloads in Setup Scripts] | ||
| **Vulnerability:** Shell scripts downloading binaries directly to the current working directory (`wget ... -O file`) or predictable locations like `/tmp/yq` instead of secure temporary directories. | ||
| **Learning:** This is a recurring pattern in OS installer scripts (`apt.sh`) that exposes users to symlink attacks or overwriting unintended files, especially dangerous when using `sudo mv` afterwards. | ||
| **Prevention:** Always use securely generated isolated temporary directories for script downloads: `TMP_DIR=$(mktemp -d)` paired with `trap 'rm -rf "$TMP_DIR"' EXIT`. Never hardcode `/tmp/` paths or download indiscriminately to the current working directory. |
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Fix markdown linting errors to pass CI.
The documentation content is accurate, but CI is failing due to markdown lint violations:
- MD041: File should start with a top-level heading (
#) - MD022: Heading needs a blank line after it
- MD013: Lines 2-4 exceed 80 characters
📝 Proposed fix for lint compliance
+# Security Learnings
+
## 2024-05-18 - [Secure Temp Downloads in Setup Scripts]
-**Vulnerability:** Shell scripts downloading binaries directly to the current working directory (`wget ... -O file`) or predictable locations like `/tmp/yq` instead of secure temporary directories.
-**Learning:** This is a recurring pattern in OS installer scripts (`apt.sh`) that exposes users to symlink attacks or overwriting unintended files, especially dangerous when using `sudo mv` afterwards.
-**Prevention:** Always use securely generated isolated temporary directories for script downloads: `TMP_DIR=$(mktemp -d)` paired with `trap 'rm -rf "$TMP_DIR"' EXIT`. Never hardcode `/tmp/` paths or download indiscriminately to the current working directory.
+
+**Vulnerability:** Shell scripts downloading binaries directly to the current
+working directory (`wget ... -O file`) or predictable locations like `/tmp/yq`
+instead of secure temporary directories.
+
+**Learning:** This is a recurring pattern in OS installer scripts (`apt.sh`)
+that exposes users to symlink attacks or overwriting unintended files,
+especially dangerous when using `sudo mv` afterward.
+
+**Prevention:** Always use securely generated isolated temporary directories
+for script downloads: `TMP_DIR=$(mktemp -d)` paired with
+`trap 'rm -rf "$TMP_DIR"' EXIT`. Never hardcode `/tmp/` paths or download
+indiscriminately to the current working directory.📝 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.
| ## 2024-05-18 - [Secure Temp Downloads in Setup Scripts] | |
| **Vulnerability:** Shell scripts downloading binaries directly to the current working directory (`wget ... -O file`) or predictable locations like `/tmp/yq` instead of secure temporary directories. | |
| **Learning:** This is a recurring pattern in OS installer scripts (`apt.sh`) that exposes users to symlink attacks or overwriting unintended files, especially dangerous when using `sudo mv` afterwards. | |
| **Prevention:** Always use securely generated isolated temporary directories for script downloads: `TMP_DIR=$(mktemp -d)` paired with `trap 'rm -rf "$TMP_DIR"' EXIT`. Never hardcode `/tmp/` paths or download indiscriminately to the current working directory. | |
| # Security Learnings | |
| ## 2024-05-18 - [Secure Temp Downloads in Setup Scripts] | |
| **Vulnerability:** Shell scripts downloading binaries directly to the current | |
| working directory (`wget ... -O file`) or predictable locations like `/tmp/yq` | |
| instead of secure temporary directories. | |
| **Learning:** This is a recurring pattern in OS installer scripts (`apt.sh`) | |
| that exposes users to symlink attacks or overwriting unintended files, | |
| especially dangerous when using `sudo mv` afterward. | |
| **Prevention:** Always use securely generated isolated temporary directories | |
| for script downloads: `TMP_DIR=$(mktemp -d)` paired with | |
| `trap 'rm -rf "$TMP_DIR"' EXIT`. Never hardcode `/tmp/` paths or download | |
| indiscriminately to the current working directory. |
🧰 Tools
🪛 GitHub Check: Lint Documentation
[failure] 4-4: Line length
.jules/sentinel.md:4:81 MD013/line-length Line length [Expected: 80; Actual: 258] 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: 201] 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: 197] 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: "## 2024-05-18 - [Secure Temp D..."] 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: "## 2024-05-18 - [Secure Temp Downloads in Setup Scripts]"] https://github.com/DavidAnson/markdownlint/blob/v0.34.0/doc/md022.md
🪛 LanguageTool
[locale-violation] ~3-~3: In American English, ‘afterward’ is the preferred variant. ‘Afterwards’ is more commonly used in British English and other dialects.
Context: ...pecially dangerous when using sudo mv afterwards. Prevention: Always use securely ge...
(AFTERWARDS_US)
🤖 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, Add a top-level heading at the top of
the file by turning the existing heading "2024-05-18 - [Secure Temp Downloads in
Setup Scripts]" into a H1 (prefix it accordingly), insert a blank line
immediately after that H1, and reflow lines 2–4 so no line exceeds 80 characters
(break long sentences and keep command examples as fenced code blocks or
indented code blocks) to satisfy MD041, MD022 and MD013 lint rules; ensure any
inline commands or paths remain properly escaped/monospaced in the markdown.
1 participant
🚨 Severity: HIGH
💡 Vulnerability: Predictable temporary file paths and downloading binaries to the current working directory. The
tools/os_installers/apt.shscript downloaded files to locations like/tmp/yqor directly to.before usingsudo dpkg -iorsudo mvon them. This creates a Time-of-Check to Time-of-Use (TOCTOU) vulnerability where a malicious user could pre-create a symlink at/tmp/yqpointing to a sensitive system file, or trick the script into overwriting local files, leading to privilege escalation whensudois executed.🎯 Impact: Local privilege escalation or denial of service by overwriting system binaries or arbitrary files owned by
root.🔧 Fix: Introduced a secure, isolated temporary directory using
TMP_DIR=$(mktemp -d)at the start of the script. All vulnerable downloads (go,yq,lsd,composer) have been updated to target this secure directory. AnEXITtrap was added to ensure the temporary directory is cleanly removed when the script finishes.✅ Verification: Run
./build.sh syntaxto verify bash syntax. The script now safely downloads and cleans up artifacts without relying on shared, predictable directories. Also added a learning to.jules/sentinel.md.PR created automatically by Jules for task 2822382016456990647 started by @kidchenko
Summary by CodeRabbit
Release Notes
Bug Fixes
Documentation