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Insecure Library Loading
Moderately critical

Yahoo! Messenger YVerInfo.dll ActiveX Control Buffer Overflows

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Release Date:  2007-08-30    Last Update:  2007-09-04    Views:  23,952

Secunia Advisory SA26579

Where:

From remote

Impact:

System access

Solution Status:

Vendor Patch

CVE Reference(s):

Description


Some vulnerabilities have been reported in Yahoo! Messenger, which can be exploited by malicious people to compromise a user's system.

The vulnerabilities are caused due to boundary errors within the YVerInfo.GetInfo.1 and YVerInfo.GetInfo2.1 ActiveX controls (YVerInfo.dll) when handling the "fvCom()" and "info()" methods. These can be exploited to cause stack-based buffer overflows by passing specially-crafted, overly long arguments to the affected methods.

Successful exploitation allows execution of arbitrary code, but requires a malicious web page is in a domain that contains a ".yahoo." substring in the subdomain of the TLD (e.g. via a cross-site scripting vulnerability or by manipulating the DNS resolution).

The vulnerabilities are reported in YVerInfo.dll versions prior to 2007.8.27.1 included in Yahoo! Messenger 8.1 downloaded before 2007-08-29.


Solution:
Update to version 8.1.0.419.

Further details available to Secunia VIM customers

Provided and/or discovered by:
Discovered by an anonymous person and reported via iDefense Labs.

Original Advisory:
Yahoo:
http://messenger.yahoo.com/security_update.php?id=082907

iDefense Labs:
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=591

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 YVerInfo.dll ActiveX Control Buffer Overflows

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