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TITLE:
Yahoo! Messenger AudioConf ActiveX Control Buffer Overflow

SECUNIA ADVISORY ID:
SA24742

VERIFY ADVISORY:
https://secunia.com/advisories/24742/

CRITICAL:
Highly critical

IMPACT:
System access

WHERE:
>From remote

SOFTWARE:
Yahoo! Messenger 8.x
https://secunia.com/product/12122/
Yahoo! Messenger 7.x
https://secunia.com/product/5956/
Yahoo! Messenger 6.x
https://secunia.com/product/4448/
Yahoo! Messenger 5.x
https://secunia.com/product/1639/

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

The vulnerability is caused due to a boundary error within the
AudioConf ActiveX control (yacscom.dll) component of Yahoo!
Messenger. This can be exploited to cause a stack-based buffer
overflow by setting the "socksHostname" and "hostName" properties to
an overly large string and then calling the
"createAndJoinConference()" method.

Successful exploitation allows execution of arbitrary code when a
user visits a malicious web site.

The vulnerability is reported in version 8.x. Other versions may also
be affected.

SOLUTION:
Update to the latest version.
https://messenger.yahoo.com

Set the kill-bit on the affected ActiveX control.

PROVIDED AND/OR DISCOVERED BY:
Discovered by Peter Vreugdenhil and reported via ZDI.

ORIGINAL ADVISORY:
Yahoo!:
https://messenger.yahoo.com/security_update.php?id=031207

ZDI:
https://www.zerodayinitiative.com/advisories/ZDI-07-012.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.

Subscribe:
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Definitions: (Criticality, Where etc.)
https://secunia.com/about_secunia_advisories/


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