The remote host is missing an update to horde3 announced via advisory DSA 909-1. Daniel Schreckling discovered that the MIME viewer in horde3, a web application suite, does not always sanitise its input leaving a possibility to force the return of malicious code that could be executed on the vicitims machine. The old stable distribution (woody) does not contain horde3 packages.

For the stable distribution (sarge) these problems have been fixed in version 3.0.4-4sarge2. For the unstable distribution (sid) these problems have been fixed in version 3.0.7-1. We recommend that you upgrade your horde3 package. https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20909-1