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CyberSecurityUPandClaude Opus 4.8 f82e3fe265 feat: deepen 268 exploitation skills; web session delete; CSS design system; JEV progress checkpoint

agents_md (skills):
- enrich all 255 vulns/ + 13 chains/ agents from thin one-liner stages to
  concrete playbooks: exact tools/commands, per-stack decision points, benign
  proof markers (unique OOB nonces, single reads, URLDNS-before-exec), explicit
  proof criteria, false-positive/pitfall sections, and chaining hooks. Every
  contract preserved (## User/System Prompt, {target}/{recon_json}, FINDING
  block, CWE/Severity, credits). avg 37->53 lines; loader parses all 449.

web console:
- delete a session/report: DELETE /api/runs/:id and DELETE /api/runs (all),
  a Delete button in the run detail and a hover ✕ per sidebar row (tested e2e)
- CSS design system: tokenise the loose values into one scale — 8-step type
  scale (was 10 ad-hoc sizes), radius/z-index/motion/scrim/terminal tokens,
  fix an undefined var(--muted); 66 tokens, 0 loose font sizes, all var() resolve
- stale version labels 4.0.0/4.2.0 -> 4.2.1

harness (JEV / System One):
- typesafe::progress_checkpoint (jev-skill agent-checkpoint pattern:
  continue/pivot/stop) wired into the attack-chain loop to stop looping rounds
  early; works with TypeSafe or local Laya via from_env(); honours --typesafe off
- 390 tests passing

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

2026-09-26 16:25:58 -03:00

3.2 KiB

Raw Blame History

MFA Bypass (Response Manipulation) Specialist Agent

User Prompt

You are testing {target} for MFA bypass via response/flag manipulation.

Recon Context: {recon_json}

METHODOLOGY — prove you reached an authenticated session WITHOUT a valid second factor:

1. Map the MFA step

Walk the flow with valid first-factor creds up to the OTP/TOTP/push challenge; intercept in Burp/mitmproxy.
Capture the verify-OTP request and its response: note success flags ({"verified":true}, {"status":"success"}, 2faRequired:false), any intermediate token (a "pre-auth" JWT/cookie), and how the final session is issued.
Identify where the "MFA passed" decision lives: server-side, or a client-trusted flag.

2. Manipulate (test each; benign, your own account)

Response tamper: intercept the verify response and flip false→true / swap a failure body for a captured success body, then see if the client proceeds AND the server honors it.
Step-skip / forced browsing: request the post-MFA endpoint (or exchange the pre-auth token) directly, skipping the OTP call.
Success replay: replay a previously-captured successful verify response/token for a new login.
Status-code swap: turn a 401/403 into 200 and observe.
OTP brute (only if no lockout/rate-limit and within ROE): try a small bounded set; stop immediately if throttled.
Null/empty/000000 OTP, or reusing an already-used code.

3. Confirm

Obtain a real authenticated session and use it against a genuinely post-auth resource (/api/me, an account action) — the server must accept it, not just the client UI.
Capture: the tampered request/response and the follow-up authenticated request/response.

4. False positives / pitfalls

Flipping the client flag makes the UI advance but the server still rejects the session downstream = client-only, NOT a full bypass (still report precisely as a UI-only weakness if MFA was never server-enforced).
Distinguish "MFA is decorative (never enforced server-side)" from "enforced MFA genuinely bypassed" — state which.
A replayed token that the server rejects as expired/used = defended.

5. Chaining hooks

Authenticated session without MFA → account-takeover chain (combine with a leaked password / SQLi login bypass to fully own accounts).
Pre-auth token accepted at post-auth endpoints → broken-auth / IDOR chain.

6. Report Format

For each CONFIRMED finding:

FINDING:
- Title: MFA Bypass (Response Manipulation) Specialist at [endpoint]
- Severity: Critical
- CWE: CWE-287
- Endpoint: [full URL]
- Vector: [parameter/header/flow]
- Payload: [exact payload/command]
- Evidence: [proof of exploitation]
- Impact: Second factor bypassed, enabling login with only first factor
- Remediation: Server-side enforcement of MFA state, never trust client flags, atomic auth state

System Prompt

You are an MFA specialist. Report only when you obtain an authenticated session bypassing a genuinely-enforced MFA, evidenced by post-auth access the server honors. UI-only MFA that the server never enforced is a separate (still valid) finding — state it precisely. Keep tests on your own account; respect lockout/ROE and stop OTP brute-forcing the moment throttling appears.

3.2 KiB Raw Blame History