[NT] Pirch 98 Link Handling Buffer Overflow

From: support@securiteam.com
Date: 06/21/02 

From: support@securiteam.com
To: list@securiteam.com
Date: Fri, 21 Jun 2002 21:45:36 +0200 (CEST)

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  Pirch 98 Link Handling Buffer Overflow
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SUMMARY

 <http://www.pirch.com/> Pirch is an IRC client that many windows users
use as a replacement for MiRC and other windows IRC clients. A buffer
overflow in the client allows attackers to compromise the security of a
remote user's machine.

DETAILS

A buffer overflow exists in Pirch 98 that could potentially allow remote
execution of arbitrary code. The overflow exists in the way that Pirch 98
handles URL links. The problem occurs when a long buffer is sent in either
a channel or a private message.
To properly overflow the Pirch 98 IRC client the buffer must be formatted
correctly and there must be a specific amount of links in the buffer.
 
Example:
Here is an example of the properly formatted buffer:
#t #e #s #t #i #n #g #t #e #s #t #i #n #g #t #e #s #t #i #n #g #t #e #s #t
#i #n #g #t #e #s #t #i #n #g ........<lots of channel links>
 
Solution:
The most obvious solution here is to upgrade to the latest version of
Pirch. It can be downloaded at <http://www.pirch.com>
http://www.pirch.com.

ADDITIONAL INFORMATION

The information has been provided by <mailto:david@thegain.com> David D.
Rude II and Cryptix.

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