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BaaRai
750f4eb091
Implements #109. Skills ship the chain-1 workflow (session file injection through upload_progress filename + app LFI -> RCE, CVE-2026-109618/109619) with hard gates: authorized targets only, program zero-day policy checked before any live attempt (patches landed 2026-10-21 for 8.2-8.5), passive detection before exploitation, lab-first practice via the vendored docker lab, chains 2/3 (UAF, serializer mismatch) marked lab-only, one-shot verification with a marker. Upstream PoCs vendored under scripts/poc/php2shell with attribution and the MIT notice (upstream declares MIT in its README).
82 lines
2.9 KiB
Markdown
82 lines
2.9 KiB
Markdown
# php2shell — CVE-2026-109618 / CVE-2026-109619 Research
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Independent security research on the critical PHP session.upload_progress vulnerabilities (CVSS v4.0 9.2).
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**Author:** Qi Deng ([@ikow](https://github.com/ikow))
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**Date:** 2026-10-21
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**Full writeup:** [qideng.substack.com](https://qideng.substack.com/)
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## Overview
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Two critical pre-auth RCE vulnerabilities in PHP core's `session.upload_progress` handler, affecting PHP 5.4.0 through 8.5.x. This repository contains verification POCs and lab setup for authorized security testing.
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### Verified Attack Chains
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| Chain | Type | Conditions | Verified |
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|-------|------|-----------|----------|
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| Session File Injection + LFI | Logic bug | `upload_progress=On` (default) + app LFI | ✅ RCE |
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| var_destroy UAF → Handler Overwrite | Memory corruption | `unserialize()` + `/proc/self/mem` | ✅ ASAN + RCE |
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| Handler Mismatch → `__destruct` | Deserialization | Cross-dir handler mismatch + POP gadget | ✅ RCE |
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### Key Findings
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1. **Session fixation** via POST body bypasses `session.use_only_cookies` ([PR #22113](https://github.com/php/php-src/pull/22113))
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2. **Unvalidated filename** in upload_progress stored raw in session files
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3. **`var_destroy` `__destruct` reentry UAF** — ASAN-confirmed heap-use-after-free
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4. **`PS(serializer)` not reset in RSHUTDOWN** — cross-request serializer leak in FPM
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5. **`__destruct` fires on decode FAILURE** — object injection via handler mismatch + trailing data
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## Repository Structure
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```
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poc/
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verify_session_injection.py — Verify filename injection into session files
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verify_uaf_asan.php — Trigger ASAN heap-use-after-free (var_destroy)
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verify_handler_mismatch.py — Verify handler mismatch → object deserialization
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lab/
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docker-compose.yml — PHP 8.2.34 FPM + nginx lab environment
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Dockerfile — Vulnerable PHP build
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php.ini — Lab configuration
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setup.sh — One-click lab setup
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docs/
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ANALYSIS.md — Full technical analysis
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```
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## Quick Start
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```bash
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# Start the lab
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cd lab && ./setup.sh
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# Verify session injection
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python3 poc/verify_session_injection.py --target http://127.0.0.1:18080
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# Verify UAF (requires ASAN build)
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docker exec php-asan-lab php poc/verify_uaf_asan.php
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# Verify handler mismatch
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python3 poc/verify_handler_mismatch.py --target http://127.0.0.1:18080
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```
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## Affected Versions
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- PHP 5.4.0 — 8.5.11 (all versions with `session.upload_progress`)
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- Fixed in: 8.2.35, 8.3.36, 8.4.27, 8.5.12 (scheduled 2026-10-21)
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- PHP 5.x, 7.x, 8.0, 8.1: **end-of-life, no official fix**
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## Mitigation
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```ini
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; Immediate mitigation (does NOT fix all attack paths)
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session.upload_progress.enabled = Off
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session.use_only_cookies = On
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```
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## Disclaimer
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This research is for authorized security testing and educational purposes only. Do not use against systems you do not own or have explicit authorization to test.
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## License
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MIT
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