From: Secunia Security Advisories (sec-advsecunia.com)
Date: Wed Dec 03 2003 - 06:26:12 CST

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TITLE:
Yahoo! Messenger "yauto.dll" Buffer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA10342

VERIFY ADVISORY:
http://www.secunia.com/advisories/10342/

CRITICAL:
Highly critical

IMPACT:
System access

WHERE:
From remote

SOFTWARE:
Yahoo! Messenger 5.x

DESCRIPTION:
A vulnerability has been reported in Yahoo! Messenger, which can be
exploited by malicious people to compromise a vulnerable system.

The vulnerability is caused due to a boundary error in the ActiveX
component "yauto.dll" in the "Open()" function. This can be exploited
to cause a buffer overflow by supplying an overly long argument to
the vulnerable function via a malicious web page.

Successful exploitation may allow a malicious web site to execute
arbitrary code on a user's system.

The vulnerability has been reported in versions 5.6.0.1347 and prior.

SOLUTION:
Remove the vulnerable ActiveX component.

Secunia furthermore recommends that running of ActiveX controls and
Active Scripting support are disabled and only allowed on a site per
site basis.

REPORTED BY / CREDITS:
Tri Huynh

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