Yahoo! Chat and Messenger Stack and Heap Overflows - Advisories

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Yahoo! Chat and Messenger Stack and Heap Overflows

Secunia Advisory:	SA9760
Release Date:	2003-09-17

Critical:	Highly critical
Impact:	System access
Where:	From remote
Solution Status:	Vendor Patch

Software:	Yahoo! Chat Yahoo! Messenger 5.x

	Want to know the next time vulnerabilities are fixed in this product? - Companies can be alerted via email and SMS!

Description: Two vulnerabilities have been identified in Yahoo! Chat and Messenger possibly allowing malicious people to execute arbitrary code through HTML documents. The problem is that the "TargetName" parameter isn't properly verified in Yahoo! Webcam Viewer Wrapper ActiveX control. This can be exploited to cause both a stack and a heap based overflow which possibly could lead to execution of arbitrary code. Another problem has been identified in the handling of the "AppId" parameter in the YInstStarter ActiveX control. This may be exploited to cause a heap overflow which could lead to execution of arbitrary code. Solution: Remove all Yahoo! ActiveX controls and reinstall the software from Yahoo!. The following page will try to detect if you are vulnerable and upgrade your ActiveX control's. http://messenger.yahoo.com/messenger/security/ Secunia recommend that you deactive ActiveX and Active Scripting. ActiveX and Active Scripting should only be allowed on a site per site basis. Provided and/or discovered by: Cesar Cerrudo Original Advisory: http://messenger.yahoo.com/messenger/security/ (Page trying to detect if you need the update)



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.

8 Related Secunia Security Advisories

1. Yahoo! Messenger AudioConf ActiveX Control Buffer Overflow

2. Yahoo! Messenger YMailAttach ActiveX Control Buffer Overflow

3. Yahoo! Messenger Audio Setup Wizard Privilege Escalation

4. Yahoo! Messenger Filename Buffer Overflow Vulnerability

5. Yahoo! Messenger IMVironment Cross-Site Scripting Vulnerability

6. Yahoo! Messenger "yauto.dll" Buffer Overflow Vulnerability

7. Yahoo! Messenger File Transfer Denial of Service Vulnerability

8. Yahoo! Chat and Messenger Hostname Buffer Overflow Vulnerability

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