Sowhat has reported two vulnerabilities in Sina UC, which can be exploited by malicious people to compromise a user's system.
1) A boundary error in the BRWOSSRE2UC.dll ActiveX Control when handling the "SendChatRoomOpt()" method can be exploited to cause a stack-based buffer overflow by passing an overly long string (greater than 5000 bytes) as the first argument.
2) A boundary error in the BRWOSSRE2UC.dll ActiveX Control when handling the "SendDownLoadFile()" method can be exploited to cause a stack-based buffer overflow by passing an overly long string as the astrDownDir argument.
Successful exploitation allows execution of arbitrary code when a user e.g. visits a malicious website.
The vulnerability is reported in UC2006. Other versions may also be affected.
Solution: Set the killbit for the affected ActiveX control.
Provided and/or discovered by: Sowhat, Nevis Labs
Original Advisory: http://secway.org/advisory/ad20070109EN.txt
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Subject: Sina UC BROWSER2UC.dll ActiveX Control Buffer Overflows
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