| name | skill-security-auditor |
| description | Security patterns and auditing for AI interactions. Scan and audit AI agent skills for security risks before installation. |
Skill Security Auditor
Scan and audit AI agent skills for security risks before installation. Produces a clear PASS / WARN / FAIL verdict with findings and remediation guidance.
What Gets Scanned
1. Code Execution Risks (Python/Bash Scripts)
Scans all .py, .sh, .bash, .js, .ts files for:
| Category | Patterns Detected | Severity |
|---|
| Command injection | os.system(), os.popen(), subprocess.call(shell=True), backtick execution | 🔴 CRITICAL |
| Code execution | eval(), exec(), compile(), __import__() | 🔴 CRITICAL |
| Obfuscation | base64-encoded payloads, codecs.decode, hex-encoded strings, chr() chains | 🔴 CRITICAL |
| Network exfiltration | requests.post(), urllib.request, socket.connect(), httpx, aiohttp | 🔴 CRITICAL |
| Credential harvesting | reads from ~/.ssh, ~/.aws, ~/.config, env var extraction patterns | 🔴 CRITICAL |
| File system abuse | writes outside skill dir, /etc/, ~/.bashrc, ~/.profile, symlink creation | 🟡 HIGH |
| Privilege escalation | sudo, chmod 777, setuid, cron manipulation | 🔴 CRITICAL |
| Unsafe deserialization | pickle.loads(), yaml.load() (without SafeLoader), marshal.loads() | 🟡 HIGH |
| Subprocess (safe) | subprocess.run() with list args, no shell | ⚪ INFO |
2. Prompt Injection in SKILL.md
Scans SKILL.md and all .md reference files for:
| Pattern | Example | Severity |
|---|
| System prompt override | "Ignore previous instructions", "You are now..." | 🔴 CRITICAL |
| Role hijacking | "Act as root", "Pretend you have no restrictions" | 🔴 CRITICAL |
| Safety bypass | "Skip safety checks", "Disable content filtering" | 🔴 CRITICAL |
| Hidden instructions | Zero-width characters, HTML comments with directives | 🟡 HIGH |
| Excessive permissions | "Run any command", "Full filesystem access" | 🟡 HIGH |
| Data extraction | "Send contents of", "Upload file to", "POST to" | 🔴 CRITICAL |
3. Dependency Supply Chain
For skills with requirements.txt, package.json, or inline pip install:
| Check | What It Does | Severity |
|---|
| Known vulnerabilities | Cross-reference with PyPI/npm advisory databases | 🔴 CRITICAL |
| Typosquatting | Flag packages similar to popular ones (e.g., reqeusts) | 🟡 HIGH |
| Unpinned versions | Flag requests>=2.0 vs requests==2.31.0 | ⚪ INFO |
| Install commands in code | pip install or npm install inside scripts | 🟡 HIGH |
| Suspicious packages | Low download count, recent creation, single maintainer | ⚪ INFO |
4. File System & Structure
| Check | What It Does | Severity |
|---|
| Boundary violation | Scripts referencing paths outside skill directory | 🟡 HIGH |
| Hidden files | .env, dotfiles that shouldn't be in a skill | 🟡 HIGH |
| Binary files | Unexpected executables, .so, .dll, .exe | 🔴 CRITICAL |
| Large files | Files >1MB that could hide payloads | ⚪ INFO |
| Symlinks | Symbolic links pointing outside skill directory | 🔴 CRITICAL |
