eEye Digital Security has been reported a vulnerability in Microsoft Windows DirectShow, which can be exploited by malicious people to compromise a user's system.
The vulnerability is caused due to a validation error in QUARTZ.DLL when decoding AVI movie files. This can be exploited to write a null byte to an arbitrary memory location e.g. the header of the heap block.
Successful exploitation allows arbitrary code execution, but requires that the user open a malicious AVI file with specially crafted value in the length field of the "strn" element.
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Subject: Microsoft Windows DirectShow AVI Handling Vulnerability
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