bugtraq - RE: Critical phpwiki c99shell exploit

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Date: Thu, 12 Apr 2007 12:50:50 -0700
From: "Ryan Neufeld" <it@...powersystems.com>
To: "'Gadi Evron'" <ge@...uxbox.org>, <rurban@...ay.at>
Cc: <bugtraq@...urityfocus.com>
Subject: RE: Critical phpwiki c99shell exploit

On that note you might as well deny php5 too

--Ryan Neufeld

IT Systems Manager

it@...powersystems.com

MagPower Systems Inc.

Ph: (640)940-3232

Fax: (640)940-3233


-----Original Message-----
From: Gadi Evron [mailto:ge@...uxbox.org] 
Sent: Thursday, April 12, 2007 9:50 AM
To: rurban@...ay.at
Cc: bugtraq@...urityfocus.com
Subject: Re: Critical phpwiki c99shell exploit

On 12 Apr 2007 rurban@...ay.at wrote:
> Via the Phpwiki 1.3.x UpLoad feature some hackers from russia uploaded a
php3 or php4 file,
> install a backdoor at port 8081 and have access to your whole disc and
overtake the server.
> 
> A url in the file is http://ccteam.ru/releases/c99shell
> 
> The uploaded file has a php, php3 or php4 extension and looks like a gif
to the mime magic.
> So apache usually accepts it.
> 
> To fix this phpwiki issue at first move the lib/plugin/UpLoad.php file out
of this directory.
> 
> You can fix it by adding those two lines to your list of disallowed
extensions:
>   php3
>   php4
> Currently only "php" is disallowed.
> 

This is a good best practice, but it doesn't hold water long
range. Further, where do you disallow these extensions? In the
application?

Mostly what the bad guys would do is upload, say.. .jpg, and then rename
it.

	Gadi.

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