bratax has discovered a vulnerability in Microsoft HTML Help Workshop, which can be exploited by malicious people to compromise a user's system.
The vulnerability is caused due to a boundary error within the handling of a ".hhp" file that contains an overly long string in the e.g. "Contents file" or "Index file" field. This can be exploited to cause a stack-based buffer overflow and allows arbitrary code execution when a malicious ".hhp" file is opened.
NOTE: A working exploit is publicly available.
The vulnerability is confirmed in version 4.74.8702.0. Other versions may also be affected.
Solution: Do not open untrusted ".hhp" files.
Provided and/or discovered by: bratax
Original Advisory: http://users.pandora.be/bratax/advisories/b008.html
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Subject: Microsoft HTML Help Workshop ".hhp" Parsing Buffer Overflow
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