A component in Microsoft Outlook Express 6 and Windows Mail in Windows Vista does not properly handle certain HTTP headers when processing MHTML protocol URLs, which allows remote attackers to obtain sensitive information from other Internet Explorer domains, aka "URL Parsing Cross Domain Information Disclosure Vulnerability."

A component in Microsoft Outlook Express 6 and Windows Mail in Windows Vista does not properly handle certain HTTP headers when processing MHTML protocol URLs, which allows remote attackers to obtain sensitive information from other Internet Explorer domains, aka "URL Parsing Cross Domain Information Disclosure Vulnerability."

Internet Explorer is vulnerable in handling MHTML (MIME Encapsulation of Aggregate HTML) protocol, which allows an arbitrary script execution. When Internet Explorer accesses a website with the MHTML protocol, Internet Explorer processes the contents as MHTML data, ignoring their actual content types. This behavior may result in executing the scripts embedded in the contents. The MHTML protocol handler is included in the Outlook Express component, and Microsoft provides the fix of the vulnerability for this component.