Vulnerability Note VU#124460
Microsoft HTML Help Workshop buffer overflow
OverviewA buffer overflow in Microsoft HTML Help Workshop may allow a remote attacker to execute arbitrary code on a vulnerable system.
I. DescriptionMicrosoft HTML Help provides a standard help system for the Windows operating system. HTML Help Workshop is a component of the software development kit for HTML Help. A lack of validation on the Contents file field within HTML Help Workshop Project files headers may allow a stack-based buffer overflow to occur. Note that Microsoft HTML Help Workshop is not installed by default on any version of Microsoft Windows.
Exploit code for this vulnerability is publicly available.
II. ImpactBy persuading a user to access a specially crafted HTML Help Workshop Project files (.hhp), a remote attacker may be able to execute arbitrary code.
III. SolutionWe are unaware of a practical solution to this problem, however we suggest the following workaround to reduce the chances of exploitation:
Do not access HTML Help Workshop Project files from untrusted sources
Exploitation occurs if a user has the HTML Help SDK installed and accesses a specially crafted HTML Help Workshop Project file. By only accessing Help Workshop Project files from known and trusted sources, the chances of exploitation are reduced.
Systems Affected
References
http://www.cert.org/tech_tips/securing_browser/
http://users.pandora.be/bratax/advisories/b008.html
http://secunia.com/advisories/18740/
http://eagle.blacksecurity.org/stuff/unl0ck/adv/55k700106.txt.
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/htmlhelp/html/vsconHH1Start.asp
http://archives.neohapsis.com/archives/ntbugtraq/2005-q2/0056.html
Credit
This vulnerability was reported by bratax.
This document was written by Jeff Gennari.
Other Information
| Date Public: | 2006-02-06 |
| Date First Published: | 2006-02-13 |
| Date Last Updated: | 2006-02-14 |
| CERT Advisory: | |
| CVE-ID(s): | CVE-2006-0564 |
| NVD-ID(s): | CVE-2006-0564 |
| US-CERT Technical Alerts: | |
| Metric: | 17.08 |
| Document Revision: | 51 |
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