Microsoft Outlook Express MHTML URL Handler File Rendering Vulnerability

Microsoft Outlook Express introduced a URL handler called MHTML (MIME Encapsulation of Aggregate HTML). This allows Internet Explorer to pass MHTML files to Outlook Express for rendering.

The MHTML URL handler does not validate the file type it is rendering. This could allow a file type that is normally considered to be a "safe file type", such as a .txt file, to be opened and have any script contained within rendered. This script would then be rendered in the Local Computer Zone.


 

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