Security Review Skill

Systematic workflow for security review and vulnerability analysis.

When to Use

• Reviewing code for security vulnerabilities
• Designing authentication/authorization systems
• Establishing sensitive data handling practices
• Pre-deployment security checklist verification

The Process

Phase 1: Security Scope Assessment

Codebase Analysis:

1. Identify authentication/authorization code
2. Map external input handling points
3. Trace sensitive data flow
4. Check external API integration points

Attack Surface Definition:

• User input: forms, URL params, headers
• File uploads: type, size, storage location
• API endpoints: public/private, auth requirements
• Database: query generation methods

Phase 2: OWASP Top 10 Check

Perform systematic check against OWASP Top 10 (2021):

• A01: Broken Access Control
• A02: Cryptographic Failures
• A03: Injection
• A04: Insecure Design
• A05: Security Misconfiguration
• A06: Vulnerable Components
• A07: Authentication Failures
• A08: Data Integrity Failures
• A09: Logging Failures
• A10: SSRF

For detailed checklist, code patterns, and search queries: Read OWASP-CHECKLIST.md in this skill directory.

Phase 3: Vulnerability Report

Severity Classification:

Level	Description	Response Time
🔴 Critical	Immediately exploitable, severe impact	Within 24h
🟠 High	Exploitable, significant impact	Within 1 week
🟡 Medium	Conditional exploit, limited impact	Within 1 month
🟢 Low	Hard to exploit, minimal impact	Next release

Phase 4: Security Design Recommendations

Provide recommendations for:

• Authentication design (JWT, session management)
• Authorization model (RBAC, ABAC)
• Data encryption strategies
• Secure coding practices

Key Principles

1. Zero Trust: Never trust any input
2. Defense in Depth: Multi-layer defense
3. Least Privilege: Minimum required permissions
4. Fail Secure: Safe state on failure
5. Security by Design: Consider security from design phase

Detailed Reference

For OWASP checklist, vulnerable code patterns, search queries, and report templates: Read OWASP-CHECKLIST.md in this skill directory.

Completion

취약점 리포트(Severity 분류 + 권고 사항)가 전달되면 완료.

Troubleshooting

Too many findings to prioritize: Focus on Critical/High first. If >20 Critical findings, the codebase likely needs a dedicated security sprint rather than a review. False positives from pattern matching: Verify each finding with actual data flow analysis. A SQL query using parameterized binding is safe even if grep finds SELECT near user input. Team pushes back on security fixes: Quantify risk with severity + exploitability. "This allows unauthenticated admin access" is more actionable than "A01 violation found."