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[SA13879] Kazaa Lite K++ K-Sig Directory Traversal Weakness

From: Secunia Security Advisories (sec-advsecunia.com)
Date: Tue Jan 18 2005 - 09:05:27 CST

TITLE:
Kazaa Lite K++ K-Sig Directory Traversal Weakness

SECUNIA ADVISORY ID:
SA13879

VERIFY ADVISORY:
http://secunia.com/advisories/13879/

CRITICAL:
Not critical

IMPACT:
Manipulation of data, DoS

WHERE:
From remote

SOFTWARE:
Kazaa Lite K++ 2.x
http://secunia.com/product/4538/

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

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