security-audit

Agent Skill: Security audit patterns for PHP/OWASP. Use when conducting security assessments, identifying vulnerabilities (XXE, SQL injection, XSS), or CVSS scoring. By Netresearch.

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Install this agent skill to your Project

npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/security/security-audit

SKILL.md

Security Audit Skill

Security audits, vulnerability assessment, and secure coding patterns aligned with OWASP.

Expertise Areas

Vulnerabilities: XXE, SQL injection, XSS, CSRF, auth flaws, insecure deserialization
Risk Scoring: CVSS v3.1 methodology
Secure Coding: Input validation, output encoding, cryptography, session management

Reference Files

references/xxe-prevention.md - XXE detection and prevention
references/owasp-top10.md - OWASP Top 10 patterns
references/cvss-scoring.md - CVSS scoring methodology
references/api-key-encryption.md - API key encryption at rest (sodium)
references/secure-php.md - PHP-specific security patterns
references/secure-config.md - Secure configuration checklists

Quick Patterns

XML parsing (prevent XXE):

php

$doc->loadXML($input, LIBXML_NONET | LIBXML_NOENT | LIBXML_DTDLOAD);

SQL (prevent injection):

php

$stmt = $pdo->prepare('SELECT * FROM users WHERE id = ?');
$stmt->execute([$id]);

Output (prevent XSS):

php

echo htmlspecialchars($input, ENT_QUOTES | ENT_HTML5, 'UTF-8');

API keys (encrypt at rest):

php

$nonce = random_bytes(SODIUM_CRYPTO_SECRETBOX_NONCEBYTES);
$encrypted = 'enc:' . base64_encode($nonce . sodium_crypto_secretbox($apiKey, $nonce, $key));

Security Checklist

bcrypt/Argon2 for passwords, CSRF tokens on state changes
All input validated server-side, parameterized SQL
XML external entities disabled, file uploads restricted
Context-appropriate output encoding, CSP configured
API keys encrypted at rest (sodium_crypto_secretbox)
TLS 1.2+, secrets not in VCS, audit logging

Verification

bash

./scripts/security-audit.sh /path/to/project

Contributing: https://github.com/netresearch/security-audit-skill