Peter Winter-Smith of NGSSoftware has discovered a high risk vulnerability in one of the dependencies of HTML Help, the InfoTech Storage System parser. This flaw can permit arbitrary code execution through a number of applications including HTML Help, Internet Explorer and Outlook/Outlook Express when parsing certain file-types. Research has proven this vulnerability to be trivially exploitable on Windows XP SP2 despite certain inbuild protective mechanisms which XPSP2 includes. This issue has been resolved in the Microsoft bulletin MS05-026, which may be downloaded from: http://www.microsoft.com/technet/security/Bulletin/MS05-026.mspx NGSSoftware are going to withhold details of this flaw for three months. Full details will be published on the 15th September 2005. This three month window will allow users of Microsoft Windows the time needed to apply the patch before the details are released to the general public. This reflects NGSSoftware's approach to responsible disclosure. NGSSoftware Insight Security Research http://www.ngssoftware.com http://www.databasesecurity.com/ http://www.nextgenss.com/ +44(0)208 401 0070
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