The remote host is missing an update to libwmf announced via advisory USN-769-1.

The problem can be corrected by upgrading your system to the following package versions: Ubuntu 6.06 LTS: libwmf0.2-7 0.2.8.3-3.1ubuntu0.2 Ubuntu 8.04 LTS: libwmf0.2-7 0.2.8.4-6ubuntu0.8.04.1 Ubuntu 8.10: libwmf0.2-7 0.2.8.4-6ubuntu0.8.10.1 Ubuntu 9.04: libwmf0.2-7 0.2.8.4-6ubuntu1.1 In general, a standard system upgrade is sufficient to effect the necessary changes. https://secure1.securityspace.com/smysecure/catid.html?in=USN-769-1

Tavis Ormandy discovered that libwmf incorrectly used memory after it had been freed when using its embedded GD library. If a user or automated system were tricked into opening a crafted WMF file, an attacker could cause a denial of service or execute arbitrary code with privileges of the user invoking the program.