skill-08-security-audit

Security Audit

When to Use

• Evaluating unknown smart contracts before interaction
• Detecting rug pull and honeypot patterns
• Monitoring for active exploits and protocol incidents
• Reviewing contract code for common vulnerabilities
• Pre-deployment security checklist

Prerequisites

• MCP: blockchain-rpc-server, defi-protocol-server
• Knowledge base: knowledge-base/security/

Workflow

1. Automated Rug Pull Checks

Run before any token swap or liquidity add:

Check	Red Flag
Ownership	owner() can mint unlimited tokens
Liquidity	LP not locked or unlock imminent
Honeypot	Sell simulation reverts
Hidden fees	Transfer tax > 10% or modifiable
Proxy	Unverified implementation, no timelock
Blacklist	isBlacklisted or pause on transfers

Use eth_call simulation: attempt buy → approve → sell in single trace.

2. Vulnerability Patterns

Scan for OWASP Smart Contract Top 10:

1. Reentrancy — external calls before state updates
2. Access control — missing onlyOwner on critical functions
3. Oracle manipulation — spot price without TWAP
4. Flash loan attacks — single-block price dependency
5. Integer issues — unchecked math (pre-0.8.0)
6. Delegatecall — untrusted implementation in proxy
7. Front-running — no slippage/deadline protection

See knowledge-base/security/common-vulnerabilities/ for patterns.

3. Exploit Monitoring

• Monitor Rekt News, DeFiLlama hacks dashboard
• Check contract against known exploit DB
• Verify protocol TVL hasn't dropped > 20% in 24h

4. Code Review Checklist

• Uses Solidity ≥ 0.8.0 with overflow checks
• External calls use checks-effects-interactions
• No selfdestruct or delegatecall to user input
• Timelock on admin functions (> 24h for DeFi)
• Events emitted for state changes
• Formal verification or audit report available

Verdict Format

RISK: LOW | MEDIUM | HIGH | CRITICAL
FINDINGS: [list with severity]
RECOMMENDATION: PROCEED | CAUTION | BLOCK

Block interaction when RISK = CRITICAL or honeypot detected.

References

• knowledge-base/security/audit-patterns/
• knowledge-base/security/exploit-db/