Code Vuln Audit Agent Skill

code-vuln-audit

A code security scanning tool with three core scanning capabilities:

• Dependency Vulnerability Scanning — Automatically detects known vulnerabilities in npm / pip dependencies
• Secret Leak Detection — Discovers hardcoded secrets, tokens, and passwords via regex matching + Shannon entropy analysis
• OWASP Pattern Detection — Identifies common security anti-patterns such as SQL injection, XSS, command injection, and insecure deserialization

Quick Start

# Scan the current directory (all checks)
python3 scripts/security_scan.py .

# Scan dependencies only
python3 scripts/security_scan.py --mode deps .

# Detect secret leaks only
python3 scripts/security_scan.py --mode secrets /path/to/project

# Detect OWASP security patterns only
python3 scripts/security_scan.py --mode owasp .

# Output report in JSON format
python3 scripts/security_scan.py --format json --output report.json .

# Only show findings at high severity and above
python3 scripts/security_scan.py --severity high .

Scan Module Details

1. Dependency Vulnerability Scanning (deps)

Automatically detects the project type and invokes the appropriate tool:

| Project Type | Detection File | Tool Used |

|---|---|---|

| Node.js | package.json + package-lock.json | npm audit |

| Python | requirements.txt / pyproject.toml / Pipfile | pip-audit |

If the corresponding audit tool is not installed, a helpful message is displayed instead of an error.

2. Secret Leak Detection (secrets)

Detection is performed in two ways:

Regex Matching: Covers common secret formats

| Secret Type | Example Pattern |

|---|---|

| AWS Access Key | 20-character string starting with AKIA |

| GitHub Token | Starts with ghp_ or github_pat_ |

| Slack Token | Starts with xoxb- or xoxp- |

| Stripe Key | Starts with sk_live_ or pk_live_ |

| Private Key File | -----BEGIN PRIVATE KEY----- |

| Generic API Key | Format like api_key = "..." |

| Credentials in URL | https://user:pass@host |

| JWT Token | eyJ... format |

Shannon Entropy Analysis: Computes information entropy for string constants in code (threshold > 4.5 and length >= 20) to discover secrets in non-standard formats.

3. OWASP Pattern Detection (owasp)

Covers statically detectable security patterns from the OWASP Top 10:

| OWASP Category | Detection Patterns |

|---|---|

| A02: Cryptographic Failures | Weak hashes (MD5/SHA1), weak ciphers (DES/RC4) |

| A03: Injection | SQL injection, command injection (os.system / subprocess shell / eval / exec), XSS (innerHTML / document.write / dangerouslySetInnerHTML / v-html) |

| A04: Insecure Design | Path traversal |

| A05: Security Misconfiguration | Debug mode enabled, CORS wildcard, binding to 0.0.0.0 |

| A08: Integrity Failures | Insecure deserialization (pickle / yaml.load / marshal / unserialize) |

| A10: SSRF | User input passed directly to HTTP requests |

Supported languages: Python, JavaScript/TypeScript, Java, PHP, Ruby, Go, and more.

Parameters

| Parameter | Description | Default |

|---|---|---|

| TARGET | Directory to scan | Current directory |

| --mode MODE | Scan mode: all, deps, secrets, owasp | all |

| --format FORMAT | Output format: text, json | text |

| --output FILE | Output file path | stdout |

| --severity LEVEL | Minimum reporting level: low, medium, high, critical | low |

| --exclude-dir DIR | Additional directories to exclude (repeatable) | - |

| --max-file-kb SIZE | Maximum file size to scan in KB | 512 |

| -h, --help | Show help | - |

Output Format

Text Output (default)

=== Security Scan Report ===
Target: /path/to/project
Modules: deps, secrets, owasp

[CRITICAL] AWS Access Key ID
  File: src/config.py:15
  Code: AWS_KEY = "AKIAIOSFODNN7EXAMPLE"

[HIGH] SQL Injection (f-string)
  File: src/db.py:42
  Code: cursor.execute(f"SELECT * FROM users WHERE id={user_id}")

--- Summary ---
Critical: 1 | High: 1 | Medium: 0 | Low: 0
Total findings: 2

JSON Output

{
  "target": "/path/to/project",
  "scan_time": "2026-04-14T10:30:00",
  "findings": [
    {
      "scanner": "secrets",
      "name": "AWS Access Key ID",
      "severity": "critical",
      "file": "src/config.py",
      "line": 15,
      "snippet": "AWS_KEY = \"AKIAIOSFODNN7EXAMPLE\"",
      "category": "secret-pattern"
    }
  ],
  "summary": {"critical": 1, "high": 0, "medium": 0, "low": 0, "total": 1}
}

Exit Codes

| Exit Code | Meaning |

|---|---|

| 0 | No findings |

| 1 | Findings present (at least one security issue) |

| 2 | Scanner internal error |

Prerequisites

• Python 3.7+ (uses standard library only)
• Dependency scanning requires the corresponding tools: npm (for Node.js projects), pip-audit (for Python projects)
• If an audit tool is missing, that module will be skipped with a notice — other modules continue to run normally