Write custom Semgrep rules to identify organization-specific logic flaws, improper cryptography usage, or missing authorization checks during source code review. This skill focuses on moving beyond default rulesets to locate complex vulnerabilities.
한국어 요약은 준비 중입니다. 원문 설명을 표시하고 있습니다.
설치 방법 보기설치하기 전에 에이전트에게 전달되는 지시 내용을 확인할 수 있습니다.
# Concept: Semgrep syntax rules:
- id: simple-eval-detection
pattern: eval(...)
message: "Avoid using eval() as it can lead to code injection."
languages: [javascript, python]
severity: ERROR
# rules:
- id: python-exec-with-variable
pattern: exec($X)
message: "Using exec() on variable $X is dangerous."
languages: [python]
severity: WARNING
# rules:
- id: missing-auth-check-flask
patterns:
- pattern-inside: |
@app.route(...)
def $FUNC(...):
...
- pattern: return $RENDER(...)
- pattern-not-inside: |
@login_required
def $FUNC(...):
...
- pattern-not-inside: |
if current_user.is_authenticated:
...
message: "Flask route missing @login_required or explicit authentication check."
languages: [python]
severity: ERROR
# # semgrep --config custom-rules.yml src/
flowchart TD
A[Identify Pattern ] --> B{Write Rule ]}
B -->|Yes| C[Test Rule ]
B -->|No| D[Refine Scope ]
C --> E[Execute Scan ]
Semgrep Custom Rule Writing — Assessment Report
============================================================
Target: [Target identifier]
Assessor: [Operator name]
Date: [Assessment date]
Scope: [Authorized scope]
MITRE ATT&CK: [Relevant technique IDs]
Findings Summary:
[Finding 1]: [Severity] — [Brief description]
[Finding 2]: [Severity] — [Brief description]
Detailed Results:
Phase 1: [Phase name]
- Result: [Outcome]
- Evidence: [Screenshot/log reference]
- Impact: [Business impact assessment]
Phase 2: [Phase name]
- Result: [Outcome]
- Evidence: [Screenshot/log reference]
- Impact: [Business impact assessment]
Risk Rating: [Critical/High/Medium/Low/Informational]
Recommendations:
1. [Immediate remediation step]
2. [Long-term hardening measure]
3. [Monitoring/detection improvement]
| Company/Platform | Total Paid | Highest Single | Year |
|---|---|---|---|
| Google VRP | $17.1M | $250,000 (CVE-2025-4609 Chrome sandbox escape) | 2025 |
| Microsoft | $16.6M | (Not disclosed) | 2024 |
| Google VRP | $11.8M | $100,115 (Chrome MiraclePtr Bypass) | 2024 |
| HackerOne (all programs) | $81M | $100,050 (crypto firm) | 2025 |
| Meta/Facebook | $2.3M | up to $300K (mobile code execution) | 2024 |
| Crypto.com (HackerOne) | $2M program | $2M max | 2024 |
| 1Password (Bugcrowd) | $1M max | $1M (highest Bugcrowd ever) | 2024 |
| Samsung | $1M max | $1M (critical mobile flaws) | 2025 |
Key Takeaway: Google alone paid $17.1M in 2025 — a 40% increase YoY. Microsoft paid $16.6M. The industry is paying more, not less. Average critical bounty on HackerOne: $3,700 (2023).
For cross-cutting methodology applicable to all vulnerability classes, see:
_shared/references/elite-chaining-strategy.md— Exploit chaining methodology and high-payout chain patterns_shared/references/elite-report-writing.md— HackerOne-optimized report writing, CWE quick reference_shared/references/real-world-bounties.md— Verified disclosed bounties by vulnerability class
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Exploit pervasive logical flaws in Multi-Factor Authentication (MFA/2FA) implementations to bypass the secondary authentication challenge entirely. Techniques include response manipulation, referal spoofing, token reuse, and predictable backup codes.
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401/403 bypass playbook. Use when encountering access-denied responses on admin panels, API endpoints, or restricted paths. Covers path manipulation, HTTP method tampering, header injection, protocol downgrade, and automated bypass tools.
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Complete PortSwigger deep-dive with exact payloads for every lab variant including zero-day techniques
한국어 요약은 준비 중입니다. 원문 설명을 표시하고 있습니다.
Active Directory ACL abuse playbook. Use when exploiting misconfigured AD permissions including GenericAll, WriteDACL, DCSync rights, shadow credentials, LAPS reading, GPO abuse, and BloodHound-guided attack paths.
한국어 요약은 준비 중입니다. 원문 설명을 표시하고 있습니다.
Execute AS-REP Roasting to extract and crack the NTLM hashes of Active Directory user accounts that have the "Do not require Kerberos preauthentication" flag explicitly enabled. This attack generates a recoverable Ticket Granting Ticket (TGT) without requiring the attacker to authenticate first.
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AD Certificate Services attack playbook. Use when targeting misconfigured AD CS for privilege escalation via ESC1-ESC13 template abuse, NTLM relay to enrollment, CA officer abuse, and certificate-based persistence.
한국어 요약은 준비 중입니다. 원문 설명을 표시하고 있습니다.