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Kazaa Lite K++ K-Sig Directory Traversal Weakness Advisory Available in Danish 

Secunia Advisory: SA13879  
Release Date: 2005-01-18

Critical:
Not critical
Impact: Manipulation of data
DoS
Where: From remote
Solution Status: Unpatched

Software:Kazaa Lite K++ 2.x

This advisory is currently marked as unpatched!
- Companies can be alerted when a patch is released!


Description:
Rafel Ivgi has discovered a weakness in Kazaa Lite K++, which can be exploited by malicious people to create or overwrite files on a user's system.

The included K-Sig KL Extension (KSig.exe) installs a "sig2dat://" URI handler. The weakness is caused due to an input validation error when processing the "File:" argument of "sig2dat://" URIs. This can be exploited via a directory traversal attack to create or overwrite .dat files in arbitrary locations on a user's system by e.g. tricking the user into visiting a malicious web site or follow a specially crafted link.

An error within the handling of the "Length" value was also reported, which crashes the K-Sig KL Extension with an EConvertError exception when processing an overly large value.

The weakness has been confirmed in Kazaa Lite K++ 2.4.3 with K-Sig 1.2.3 (Build 5). Other versions may also be affected.

Solution:
Remove the association for the "sig2dat://" URI handler. This may impact the functionality.

Provided and/or discovered by:
Rafel Ivgi

Original Advisory:
http://theinsider.deep-ice.com/texts/advisory70.txt



Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.

Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.


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