|Title||Cumulative Patch for Outlook Express (330994)|
|Summary||MHTML stands for MIME Encapsulation of Aggregate HTML. MHTML is an Internet standard that defines the MIME (Multipurpose Internet Mail Extensions) structure used to send HTML content in e-mail message bodies. The MHTML URL Handler in Windows is part of Outlook Express and provides a URL type that can be used on the local machine. This URL type (MHTML://) allows MHTML documents to be launched from a command line- from Start/Run- using Windows Explorer or from within Internet Explorer. A vulnerability exists in the MHTML URL Handler that allows any file that can be rendered as text to be opened and rendered as part of a page in Internet Explorer. As a result- it would be possible to construct a URL that referred to a text file that was stored on the local computer and have that file render as HTML. If the text file contained script- that script would execute when the file was accessed. Since the file would reside on the local computer- it would be rendered in the Local Computer Security Zone. Files that are opened within the Local Computer Zone are subject to fewer restrictions than files opened in other security zones.|
List of Patches
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