TITLE:
Microsoft HTML Help Workshop ".hhp" Parsing Buffer Overflow

SECUNIA ADVISORY ID:
SA18740

VERIFY ADVISORY:
http://secunia.com/advisories/18740/

CRITICAL:
Moderately critical

IMPACT:
System access

WHERE:
>From remote

SOFTWARE:
Microsoft HTML Help Workshop 4.x
http://secunia.com/product/6967/

DESCRIPTION:
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
"Contents 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: An exploit is publicly available.

The vulnerability has been 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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