The remote host is missing an update to gdm announced via advisory DSA 1040-1. A vulnerability has been identified in gdm, a display manager for X, that could allow a local attacker to gain elevated privileges by exploiting a race condition in the handling of the .ICEauthority file. The old stable distribution (woody) is not affected by this problem.
For the stable distribution (sarge) this problem has been fixed in version 18.104.22.168-1sarge2. For the unstable distribution (sid) this problem will be fixed in version 2.14.1-1. We recommend that you upgrade your gdm package. https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201040-1