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Insecure Library Loading
Extremely critical

Yahoo! Messenger Two ActiveX Controls Buffer Overflows

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Release Date:  2007-06-07    Last Update:  2007-06-13    Views:  38,353

Secunia Advisory SA25547

Where:

From remote

Impact:

System access

Solution Status:

Vendor Patch

CVE Reference(s):

Description


Danny has discovered two vulnerabilities in Yahoo! Messenger, which can be exploited by malicious people to compromise a user's system.

1) A boundary error within the Yahoo! Webcam Upload (ywcupl.dll) ActiveX control can be exploited to cause a stack-based buffer overflow by assigning an overly long string to the "Server" property and then calling the "Send()" method.

2) A boundary error within the Yahoo! Webcam Viewer (ywcvwr.dll) ActiveX control can be exploited to cause a stack-based buffer overflow by assigning an overly long string to the "Server" property and then calling the "Receive()" method.

Successful exploitation of the vulnerabilities allows execution of arbitrary code.

The vulnerabilities are confirmed in version 8.1.0.249. Other versions may also be affected.


Solution:
Update to the latest version.

Further details available to Secunia VIM customers

Provided and/or discovered by:
Danny

Also independently discovered by:
Greg Linares, eEye Digital Security.

Original Advisory:
Yahoo:
http://messenger.yahoo.com/security_update.php?id=060707

Full-Disclosure:
http://lists.grok.org.uk/pipermail/full-disclosure/2007-June/063817.html
http://lists.grok.org.uk/pipermail/full-disclosure/2007-June/063819.html

eEye Digital Security:
http://research.eeye.com/html/advisories/published/AD20070608.html

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Yahoo! Messenger Two ActiveX Controls Buffer Overflows

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