Perseus Audit (Phase 2)

Overview

This skill executes the Vulnerability Analysis Phase of the Perseus framework. It performs deep-dive white-box analysis on the components identified during the Scan phase.

Goal: Prove the potential for exploitation by finding source-to-sink paths lacking proper defense.

Methodology:

1. Launch 5 Agents in Parallel: Injection, XSS, Auth, Authz, SSRF.
2. Negative Analysis Loop: Trace Source -> Sanitizers -> Sink -> Verdict.
3. Exploit Queue: Generate actionable vulnerabilities for verification.

Confidence Scoring (Required)

Assign confidence to every finding:

Prioritize exploit queue in this order:

1. High + Critical/High severity
2. Medium + Critical/High severity
3. Remaining findings

Execution Instructions

Launch these 5 agents simultaneously using a single message with multiple Task tool calls:

1. Injection Analyst:
   • "Trace untrusted input to SQL/Command sinks. Verify if sanitization matches sink context. Flag string concatenation in queries."
2. XSS Specialist:
   • "Trace input to browser sinks (innerHTML, eval). Verify context-aware escaping. Flag raw HTML rendering."
3. Auth Specialist:
   • "Analyze login/session logic. Check for bypasses, weak tokens, and missing MFA. Verify state/nonce in OAuth."
4. Authz Specialist:
   • "Analyze permission checks (RBAC/ABAC). Check for IDOR and Privilege Escalation. Verify every protected route has a guard."
5. SSRF Specialist:
   • "Trace input to outbound request sinks. Verify URL validation and allowlists. Check for local network access."

Analysis Methodology (The "Negative Analysis" Loop)

For each agent, enforce this loop:

1. Trace Source: Identify where untrusted data enters (from Scan phase).
2. Trace Flow: Follow variables through functions, middleware, and transforms.
3. Identify Sink: Where does the data end up? (DB, Screen, Log, Shell).
4. Verify Defense:
   • Is there validation? (e.g., zod.parse)
   • Is there sanitization? (e.g., escapeHtml)
   • Is it parameterized? (e.g., Prepared Statements)
5. Verdict:
   • VULNERABLE: Path exists + Defense missing/mismatched. -> Add to Exploit Queue
   • SAFE: Defense is robust. -> Document as Secure

Output Requirements

Each agent must produce a specialized report in deliverables/:

• injection_analysis.md
• xss_analysis.md
• auth_analysis.md
• authz_analysis.md
• ssrf_analysis.md

For each finding include:

• Finding ID
• Source -> Sink Path
• Missing or Mismatched Defense
• Preconditions
• Confidence: High | Medium | Low
• Exploit Candidate: Yes | No (and reason)

Next Step: Proceed to perseus:exploit to verify findings with Proof-of-Concept.