The remote host is missing an update to libsndfile announced via advisory DSA 1742-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201742-1

Alan Rad Pop discovered that libsndfile, a library to read and write sampled audio data, is prone to an integer overflow. This causes a heap-based buffer overflow when processing crafted CAF description chunks possibly leading to arbitrary code execution. For the oldstable distribution (etch) this problem has been fixed in version 1.0.16-2+etch1. For the stable distribution (lenny) this problem has been fixed in version 1.0.17-4+lenny1. For the unstable distribution (sid) this problem has been fixed in version 1.0.19-1. We recommend that you upgrade your libsndfile packages.