The remote host is missing an update to squirrelmail announced via advisory DSA 1241-1. Martijn Brinkers discovered cross-site scripting vulnerabilities in the the mailto parameter of webmail.php, the session and delete_draft parameters of compose.php and through a shortcoming in the magicHTML filter. An attacker could abuse these to execute malicious JavaScript in the user's webmail session. Also, a workaround was made for Internet Explorer <= 5: IE will attempt to guess the MIME type of attachments based on content, not the MIME header sent. Attachments could fake to be an 'harmless' JPEG, while they were in fact HTML that Internet Explorer would render.

For the stable distribution (sarge) these problems have been fixed in version 2:1.4.4-10. For the upcoming stable distribution (etch) these problems have been fixed in version 2:1.4.9a-1. For the unstable distribution (sid) these problems have been fixed in version 2:1.4.9a-1. We recommend that you upgrade your squirrelmail package. https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201241-1