triage-validation – skill Viết lách & Nội dung cho agent AI

TRIAGE & VALIDATION

One wrong answer = STOP this finding. Kill the finding. Move on to the next test class.

> Scope of "STOP" in this skill: This skill's gates kill INDIVIDUAL FINDINGS that fail validation. They do NOT authorize stopping the engagement. Killing a finding via the 7-Question Gate just means *that finding* doesn't get submitted — every other test class in the engagement is still pending. See redteam-mindset "DO NOT STOP primary directive" for the coverage-axis rule.

> "N/A hurts your validity ratio. Informative is neutral. Only submit what passes all 7 questions."

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THE 7-QUESTION GATE

Ask IN ORDER. One wrong answer = STOP immediately.

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Q1: Can an attacker use this RIGHT NOW, step by step?

Complete this template:

1. Setup:   I need [own account / another user's ID / no account]
2. Request: [exact HTTP method, URL, headers, body — copy-paste ready]
3. Result:  I can [read / modify / delete] [exact data shown in response]
4. Impact:  The real-world consequence is [account takeover / PII read / money stolen]
5. Cost:    Time: [X minutes], Capital: [$0 / $X subscription required]

If you CANNOT write step 2 as a real HTTP request → KILL IT.

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Q2: Is the impact on the program's accepted impact list?

Go to the program page. Find "Vulnerability Types" or "Out of Scope."

Common tiers:

• Critical: Any-user ATO without interaction, RCE, SQLi with data exfil, admin auth bypass
• High: Mass PII exfil, privilege escalation, internal SSRF with data, stored XSS all users
• Medium: IDOR on specific user non-critical data, XSS on sensitive page requiring click
• Low: Non-sensitive info disclosure, clickjacking with PoC

If your bug maps to a listed exclusion → KILL IT.

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Q3: Is the root cause in an in-scope asset?

Confirm:

• Vulnerable domain is on the in-scope list (not *.internal.target.com)
• It's a production asset (not staging/dev unless explicitly in scope)
• It's not a third-party service the company just uses (not Stripe, Salesforce, Google Auth)

If out-of-scope → KILL IT.

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Q4: Does it require privileged access that an attacker can't realistically get?

• "Admin can do X" = centralization risk = KILL IT (on 99% of programs)
• "Non-admin can do X that only admin should do" = valid
• "Requires physical access / MFA device" = usually invalid
• "Requires compromised victim account to work" = questionable, low severity at best

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Q5: Is this already known or accepted behavior?

Search:

1. Program's HackerOne/Bugcrowd disclosed reports: Ctrl+F endpoint name + bug class

2. GitHub issues on target repo: is:issue label:security ENDPOINT_NAME

3. Changelog/CHANGELOG.md — does it mention this behavior?

4. API docs / design docs — is it documented as intended?

If acknowledged/design decision → KILL IT.

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Q6: Can you prove impact beyond "technically possible"?

• XSS → show actual cookie theft or session hijack, not just alert(1) or alert(document.domain)
• SSRF → hit an internal endpoint that returns data, not just DNS ping
• SQLi → show actual data exfil from a real table, not just error message
• IDOR → show actual other-user's data in response, not just a 200 status code

If you can only show "technically possible" → DOWNGRADE severity, not kill.

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Q7: Is this a known-invalid bug class?

Check the NEVER SUBMIT list below. If it's on this list without a chain → KILL IT.

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4 PRE-SUBMISSION GATES

Run in sequence. ALL 4 must PASS.

Gate 0: Reality Check (30 seconds)

[ ] Bug is REAL — confirmed with actual HTTP requests, not code reading alone
[ ] Bug is IN SCOPE — checked program scope page explicitly
[ ] Reproducible from scratch — can reproduce starting from fresh session
[ ] Evidence ready — screenshot, response body, or video

Gate 1: Impact Validation (2 minutes)

[ ] Can answer: "What can attacker DO that they couldn't before?"
[ ] Answer is more than "see non-sensitive data" (unless program pays for info disclosure)
[ ] Real victim: another user's data, company's data, financial loss
[ ] Not relying on victim doing something unlikely

Gate 2: Deduplication Check (5 minutes)

[ ] Searched HackerOne Hacktivity for this program + similar bug title/endpoint
[ ] Searched GitHub issues for target repo
[ ] Read most recent 5 disclosed reports for this program
[ ] Not a "known issue" in their changelog or public docs
[ ] Google: "TARGET_NAME ENDPOINT_NAME bug bounty"

Gate 3: Report Quality (10 minutes)

[ ] Title: [Bug Class] in [Endpoint] allows [actor] to [impact]
[ ] Steps to Reproduce: copy-pasteable HTTP request
[ ] Evidence: screenshot/video of actual impact (not just 200 status)
[ ] Severity: matches CVSS 3.1 score AND program's severity definitions
[ ] Remediation: 1-2 sentences of concrete fix
[ ] NEVER used "could potentially" or "may allow"

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NEVER SUBMIT LIST

Submitting these destroys your validity ratio.

Missing CSP / HSTS / security headers
Missing SPF / DKIM / DMARC
GraphQL introspection alone (no auth bypass, no IDOR demonstrated)
Banner / version disclosure without working CVE exploit
Clickjacking on non-sensitive pages (no sensitive action PoC)
Tabnabbing
CSV injection (no actual code execution shown)
CORS wildcard (*) without credential exfil proof of concept
Logout CSRF
Self-XSS (only exploits own account)
Open redirect alone (no ATO or OAuth theft chain)
OAuth client_secret in mobile app (known, expected)
SSRF DNS callback only (no internal service access or data)
Host header injection alone (no password reset poisoning PoC)
Rate limit on non-critical forms (search, contact, login with Cloudflare)
Session not invalidated on logout
Concurrent sessions
Internal IP in error message
Mixed content
SSL weak ciphers
Missing HttpOnly / Secure cookie flags alone
Broken external links
Autocomplete on password fields
Pre-account takeover (usually — very specific conditions required)

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CONDITIONALLY VALID — CHAIN REQUIRED

Build the chain first, prove it works end to end, THEN report.

| Standalone Finding | Chain Required | Valid Result |

|---|---|---|

| Open redirect | + OAuth redirect_uri → auth code theft | ATO (Critical) |

| Clickjacking | + sensitive action + working PoC | Medium |

| CORS wildcard | + credentialed request exfils user PII | High |

| CSRF | + sensitive action (transfer funds, change email, delete account) | High |

| Rate limit bypass | + OTP/reset token brute force succeeds | Medium/High |

| SSRF DNS-only | + internal service access + data returned | Medium |

| Host header injection | + password reset email uses injected host | High |

| Prompt injection | + reads other user's data (IDOR) | High |

| S3 bucket listing | + JS bundles contain API keys or OAuth secrets | Medium/High |

| Self-XSS | + CSRF to trigger it on victim without their knowledge | Medium |

| Subdomain takeover | + OAuth redirect_uri registered at that subdomain | Critical |

| GraphQL introspection | + auth bypass mutation or IDOR on node() | High |

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CVSS 3.1 QUICK REFERENCE

Common Score Examples

| Finding | Score | Severity | Vector |

|---|---|---|---|

| IDOR read PII, any user, auth required | 6.5 | Medium | AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |

| IDOR write/delete, any user | 7.5 | High | AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |

| Auth bypass → admin panel | 9.8 | Critical | AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |

| Stored XSS → cookie theft, stored | 8.5 | High | AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N |

| SQLi → full DB dump | 9.1 | Critical | AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |

| SSRF → cloud metadata | 9.1 | Critical | AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N |

| Race → double spend | 7.5 | High | AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N |

| GraphQL auth bypass | 8.1 | High | AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |

| JWT none algorithm | 9.1 | Critical | AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |

> UI for stored XSS is a judgment call. Stored XSS that fires on page view is a long-standing CVSS gray area — NVD/FIRST frequently score it UI:R (which drops the stored-XSS row above to ~7.6). The UI:N above models "no extra action beyond normal page use"; if your triager expects UI:R, defend the choice or re-score before copying the number into a report.

Metric Quick Guide

| What you have | Metric | Value |

|---|---|---|

| Exploitable over internet | AV | Network (N) |

| No special timing or race | AC | Low (L) |

| Free account needed | PR | Low (L) |

| No login needed | PR | None (N) |

| Admin needed | PR | High (H) |

| No victim action | UI | None (N) |

| Victim must click | UI | Required (R) |

| Reads all data | C | High (H) |

| Reads some data | C | Low (L) |

| Modifies all data | I | High (H) |

| Crashes service | A | High (H) |

| Affects only app | S | Unchanged (U) |

| Affects browser/OS/cloud | S | Changed (C) |

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KILL FAST RULES

The goal is to QUICKLY disqualify bad leads so you hunt real bugs:

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