shinnai has discovered some vulnerabilities in PowerPoint Viewer OCX, which can be exploited by malicious people to compromise a user's system.
The vulnerabilities are caused due to boundary errors within the PowerPoint Viewer ActiveX control (PowerPointViewer.ocx). These can be exploited to cause stack-based buffer overflows via overly long arguments passed to certain methods (e.g. "HttpDownloadFile()" or "OpenWebFile()").
Successful exploitation may allow execution of arbitrary code when a user visits a malicious website.
The vulnerabilities are confirmed in version 188.8.131.52. Other versions may also be affected.
Solution: Set the kill-bit for the affected ActiveX control.
Provided and/or discovered by: shinnai
Original Advisory: http://moaxb.blogspot.com/2007/05/moaxb-01-powerpointviewerocx-31.html
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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
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Subject: PowerPoint Viewer OCX ActiveX Control Buffer Overflow Vulnerabilities
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