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.
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Subject: Yahoo! Messenger YVerInfo.dll ActiveX Control Buffer Overflows
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