Two vulnerabilities have been reported in MIMEsweeper for Web, which can be exploited by malicious people to cause a DoS (Denial of Service) and conduct cross-site scripting attacks.

1) Input passed via the URL when attempting to access blocked web sites (as defined by the MIMEsweeper policy) isn't properly sanitised before being returned to the user via an error page. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an arbitrary blocked web site.

Example:
http://[blocked web site]/[code]

2) An error in the scanning functionality can be exploited to crash the Web Policy Engine service via a specially crafted, encrypted RAR archive.

Solution
Update to version 5.1.15.
Further details available in Customer Area

Provided and/or discovered by
1) Erez Metula
2) Reported by the vendor.

Changelog
Further details available in Customer Area

Original Advisory
Clearswift:
http://download.mimesweeper.com/www/TechnicalDocumentation/WebReadMeHotfix5115.htm

Deep Links
Links available in Customer Area