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TITLE:
Pidgin MSN File Transfer Filename Processing Vulnerability

SECUNIA ADVISORY ID:
SA30881

VERIFY ADVISORY:
http://secunia.com/advisories/30881/

CRITICAL:
Moderately critical

IMPACT:
DoS, System access

WHERE:
>From remote

SOFTWARE:
Pidgin 2.x
http://secunia.com/product/14677/

DESCRIPTION:
Juan Pablo Lopez Yacubian has discovered a vulnerability in Pidgin,
which potentially can be exploited by malicious people to compromise
a user's system.

The vulnerability is caused due to an use-after-free error within the
"msn_slplink_process_msg()" function in
libpurple/protocols/msnp9/slplink.c while processing MSN P2P file
transfer requests. This can be exploited to dereference previously
freed memory by tricking a user into accepting a file having a
specially crafted filename.

Successful exploitation may allow execution of arbitrary code.

The vulnerability is confirmed in versions 2.4.1 and 2.4.2. Other
versions may also be affected.

SOLUTION:
Do not accept file transfer requests from untrusted people.

PROVIDED AND/OR DISCOVERED BY:
Juan Pablo Lopez Yacubian

ORIGINAL ADVISORY:
http://archives.neohapsis.com/archives/bugtraq/2008-06/0225.html

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

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