The remote host is missing an update to imlib2 announced via advisory DSA 628-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20628-1

Pavel Kankovsky discovered that several overflows found in the libXpm library were also present in imlib and imlib2, imaging libraries for X11. An attacker could create a carefully crafted image file in such a way that it could cause an application linked with imlib or imlib2 to execute arbitrary code when the file was opened by a victim. The Common Vulnerabilities and Exposures project identifies the following problems: CVE-2004-1025 Multiple heap-based buffer overflows. No such code is present in imlib2. CVE-2004-1026 Multiple integer overflows in the imlib library. For the stable distribution (woody) these problems have been fixed in version 1.0.5-2woody2. For the unstable distribution (sid) these problems will be fixed soon. We recommend that you upgrade your imlib2 packages.