hunt-file-upload SKILL.md skillC
hunt-file-upload from adriannoes/awesome-agentic-ai is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add adriannoes/awesome-agentic-ai/hunt-file-upload@git:20260611.ff4cc7cPins git:20260611.ff4cc7c in mdr.lock. Pin the fingerprint instead.
- Audit grade
- C, 15 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- adriannoes/awesome-agentic-ai
- Path
cursor-claude-codex/skills/bug-hunter/skills/hunt-file-upload/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260611.ff4cc7c, committed Jun 11, 2026
- Size
- 4,707 bytes
- Repository stars
- 69
- License
- MIT
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\0.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…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
## 9. FILE UPLOAD ### 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 | | Double extension | `shell.jpg.php` | Only allow single extension | | MIME spoof | Content-Type: image/jpeg with .php body | Validate magic bytes, not MIME header | | Magic bytes prefix | Prepend `GIF89a;` to PHP code | Parse whole file, not just header | | Polyglot | Valid as JPEG and PHP | Process as image lib, reject if invalid | | SVG JavaScript | `<svg onload="...">` | Sanitize SVG or disallow entirely | | XXE in DOCX | Malicious XML in Office ZIP | Disable external entities | | ZIP slip | `../../../etc/passwd` in archive | Validate extracted paths | | Filename injection | `; rm -rf /` in filename | Sanitize + use UUID names | ### Magic Bytes Reference | Type | Hex | |---|---| | JPEG | `FF D8 FF` | …
Read the whole file at its exact version.
How to install
mdr add adriannoes/awesome-agentic-ai/hunt-file-upload@sha256:fbf6057321153d8fThe line at the top of this page pins the label git:20260611.ff4cc7c, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_o3jjlddaijydztbk)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Jun 11, 2026.
Audit of the latest version
- fail: No link to a raw IP address (matched: http://169.254.169.254)
- fail: No script tag (matched: <script)
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (4707 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
Starting a new one? Use a template for SKILL.md on mdpantry, which passes every one of these checks and says what to change in it.
Source
adriannoes/awesome-agentic-ai · 69 stars · license MIT · pushed 2026-10-10 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_o3jjlddaijydztbk GET https://markdownregistry.com/api/v1/resolve?ref=adriannoes/awesome-agentic-ai/hunt-file-upload GET https://markdownregistry.com/api/v1/blob/fbf6057321153d8fc8228ee2555ec988e6b709b4c717a85bc2a7a199f2cdec61
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
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