The remote host is missing an update to tiff announced via advisory DSA 2256-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%202256-1

Tavis Ormandy discovered that the Tag Image File Format (TIFF) library is vulnerable to a buffer overflow triggered by a crafted OJPEG file which allows for a crash and potentially execution of arbitrary code. The oldstable distribution (lenny) is not affected by this problem. For the stable distribution (squeeze), this problem has been fixed in version 3.9.4-5+squeeze2. For the testing distribution (wheezy) and unstable distribution (sid), this problem has been fixed in version 3.9.5-1. We recommend that you upgrade your tiff packages.