Re: [Full-disclosure] WordPress <= 2.8.5 Unrestricted File Upload Arbitrary PHP Code Execution

[Moritz Naumann <security@xxxxxxxxxxxxxxxxxx>]

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Milan Berger wrote:
> Hi there,
> 
>> IV. PROOF OF CONCEPT
>> -------------------------
>> Browser is enough to replicate this issue. Simply log in to your  
>> wordpress blog as a low privileged
>> user or admin. Create a new post and use the media file upload
>> feature to upload a file:
>>
>> test-image.php.jpg
>>
>> containing the following code:
>>
>> <?php
>>      phpinfo();
>> ?>
>>
>> After the upload you should receive a positive response saying:
>>
>> test-vuln.php.jpg
>> image/jpeg
>> 2009-11-11
>>
>> and it should be possible to request the uploaded file via a link:
>> http://link-to-our-wp-unsecured-blog.com/wp-content/uploads/2009/11/test-vuln.php.jpg
> 
> tried this with lighttpd and wordpress 2.8.5 and PHP 5.2.11-pl0-gentoo
> with Suhosin-Patch 0.9.7
> Shows a broken image no code executed.

This is specific to Apaches' Add* directives, when combined with the PHP
SAPI / Apache module:
http://httpd.apache.org/docs/2.2/mod/mod_mime.html#multipleext
http://isc.sans.org/diary.html?storyid=6139

It's been like that for years, but many Linux distros still ship with
default configurations which bear this issue.
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