Jacques Copeau has reported a vulnerability in Simple Machines Forum, which can be exploited by malicious users to conduct cross-site scripting attacks.
The vulnerability is caused due to insecure handling of uploaded BMP image files. This can be exploited to execute arbitrary HTML and script code in a user's Internet Explorer session in the context of an affected site by uploading malformed BMP files, which are interpreted by the user's browser as having a "text/html" MIME type.
The vulnerability is reported in version 1.1.8. Other versions may also be affected.
Solution: Update to version 1.1.9.
Provided and/or discovered by: Jacques Copeau
Original Advisory: http://archives.neohapsis.com/archives/fulldisclosure/2009-05/0256.html
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Subject: Simple Machines Forum BMP Uploads Cross-Site Scripting
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