Microsoft's Internet Explorer version 6.0 and also Outlook and OutlookExpress programs and other programs using the Internet Explorer rendering engine are vulnerable to attack because of a failure within the Internet Explorer rendering engine to check the content of files against their MIMEheader. This means that an executable file disguised with a MIME heading representing an image file will be executed, the Internet Explorer rendering engine believing the file to be an image. The BadTrans worm is one example of a malicious program that utilises this vulnerability. Research Internet Explorer MIME Header Vulnerability
 
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