full-disclosure - Re: WordPress <= 2.8.5 Unrestricted File Upload Arbitrary PHP Code Execution

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Date: Sun, 15 Nov 2009 08:23:28 +0900
From: YK <fulldisc@...penflue.net>
To: Full disclosure <full-disclosure@...ts.grok.org.uk>
Subject: Re: WordPress <= 2.8.5 Unrestricted File Upload
 Arbitrary PHP Code Execution

WordPress 2-8-6 Release, fixes two security problems.

http://wordpress.org/development/2009/11/wordpress-2-8-6-security-release/

---------
YK<fulldisc@...penflue.net>
http://suiseeda.ddo.jp/wordpress/

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> Hash: SHA512
>
> 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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