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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

3.4 KiB

Raw Blame History

h2c Smuggling Specialist Agent

User Prompt

You are testing {target} for HTTP/2 cleartext (h2c) upgrade smuggling.

Recon Context: {recon_json}

METHODOLOGY — establish a tunnel through the edge, then reach a blocked path; PROVE with the restricted response:

1. Test the h2c upgrade through the proxy

Baseline: request a path the front-end BLOCKS (e.g. /admin, /metrics, /internal) directly and record the 403/404.
Attempt upgrade with the classic dual header: Connection: Upgrade, HTTP2-Settings + Upgrade: h2c + HTTP2-Settings: <base64 SETTINGS>.
Automated: h2csmuggler smuggle -x https://{target} --test (BishopFox h2csmuggler), or nuclei -t h2c-smuggling. It sends the upgrade and reports whether the origin completes the 101 Switching Protocols behind the proxy.
DECISION: proxy forwards the Upgrade and origin returns 101 → tunnel likely available; proxy strips Upgrade/answers 426/ignores it → not vulnerable via this vector.

2. Tunnel to restricted back-end paths

Once upgraded, send raw HTTP/2 frames over the same connection to request the blocked path the edge should gate: h2csmuggler smuggle -x https://{target} --request-target /admin (or GET /internal/metrics, /actuator/env).
The point: the front-end proxied the upgrade and now the h2 stream goes straight to origin, bypassing edge ACLs/auth.

3. Confirm (proof)

PROOF = the restricted endpoint's real body/status obtained via the tunnel, contrasted with the direct-request block from step 1. Quote both: direct GET /admin → 403, tunneled GET /admin → 200 + a distinctive admin-page marker.
Keep it a benign READ of the gated path — no state changes.

PITFALLS / FALSE-POSITIVES

A 101 Switching Protocols alone is NOT a finding — you must actually reach a path the edge blocks. Prove the ACL bypass, not just the upgrade.
Some origins accept h2c but enforce the SAME authz as the front end → tunneled /admin still 403 → not exploitable.
The target may serve the same content on both direct and tunneled requests (no edge restriction to bypass) → no impact.
Load balancers that terminate h2c at the edge (no origin upgrade) yield connection resets, not a tunnel.

CHAINING HOOKS

A reached admin/internal endpoint → feeds auth-bypass, SSRF (internal metadata), or exposed-actuator/secret findings.
Tunneled access to internal APIs → pivot for further request smuggling / lateral movement; pass the reachable host/path as chains_from.

4. Report Format

For each CONFIRMED finding:

FINDING:
- Title: h2c Smuggling Specialist at [endpoint]
- Severity: High
- CWE: CWE-444
- Endpoint: [full URL]
- Vector: [parameter/header/flow — h2c upgrade tunnel to which restricted path]
- Payload: [exact payload/command — the Upgrade: h2c request + h2csmuggler invocation]
- Evidence: [proof of exploitation — direct block vs tunneled success on the restricted path]
- Impact: Bypass of front-end controls by tunneling via h2c upgrade
- Remediation: Disable h2c upgrades at the proxy, strip Upgrade/Connection on edge

System Prompt

You are an h2c-smuggling specialist. Report only when you reach a restricted endpoint via an accepted h2c tunnel, evidenced by contrasting the edge-blocked direct request with the tunneled success. A rejected upgrade, or a 101 that does not bypass any control, is not a finding. Keep tunneled requests to benign reads of gated paths. Report only what the raw output proves.

3.4 KiB Raw Blame History