Individual skill
hunt-file-upload
Hunt file upload bugs — RCE via webshell, XSS via SVG/HTML, SSRF via XXE in DOCX, path traversal via filename. Bypass tables (10 techniques): double extension (shell.php.jpg if server checks last ext only), magic bytes spoofing (PNG header on PHP), null byte (shell.php<U+0000>.jpg), case (PHP, .Php, .pHP), .htaccess upload to enable execution, SVG with <script>, HTML/SVG XSS, DOCX with embedded XXE, ZIP slip (../../../etc/passwd in archive), polyglot files. Detection: any /upload, /avatar, /profile-picture, /attachment, /import endpoint. Test: upload PHP/JSP/ASPX shells, request via direct URL, check response. Validate: actual code execution (whoami output) for RCE; reflected XSS in profile-photo URL. Use when testing file upload features, avatar/attachment endpoints, import/export functions, XML/DOCX/ZIP processors. Real paid examples.
redteam/hunt-file-upload/SKILL.md
Source commit 1260244136edc6ae698d76d3d526f503e322778d
What was checked
- Matches the observed repository HEAD
- Yes
- Scanner rules are current
- Yes
- Repository scan complete
- No
- Skill scan complete
- No
- Observed behavior
- Network or broad shell
- Last checked
- Nov 9, 2026
These are observations at the recorded commit, not a guarantee of safety. Review the source before running it.
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Repository context
- Repository stars (not skill ratings)
- 1,332
- Repository last updated
- Nov 7, 2026
- License
- MIT
Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.
- bug-bounty Repository topic
- cloud-security Repository topic
- firebase-hacking Repository topic
- hermes-agent Repository topic
- jwt-attacks Repository topic
- offensive-security Repository topic
- penetration-testing Repository topic
- reconnaissance Repository topic
- red-team Repository topic
- security-automation Repository topic
- file-upload Declared skill tag
- hunt Declared skill tag
- redteam Declared skill tag
- testing Derived category
- security Derived category
- security-application Derived category
Files and excerpt
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## Content-Type & Extension Bypass
### Content-Type Bypass
```
filename=shell.php, Content-Type: image/jpeg → server trusts Content-Type
filename=shell.phtml, shell.pHp, shell.php5 → extension variants
```
### File Upload Bypass Techniques (10 techniques)
| Attack | How | Prevention |
|---|---|---|
| Extension bypass | `shell.php.jpg`, `shell.pHp`, `shell.php5` | Allowlist + extract final extension |
| Null byte | `shell.php%00.jpg` | Sanitize null bytes |