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Insecure Library Loading
Highly critical

Sina UC BROWSER2UC.dll ActiveX Control Buffer Overflows

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Release Date:  2007-01-09    Last Update:  2007-01-17    Views:  8,022

Secunia Advisory SA23638

Where:

From remote

Impact:

System access

Solution Status:

Unpatched

Software:

CVE Reference(s):

Description


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

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: Sina UC BROWSER2UC.dll ActiveX Control Buffer Overflows

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