The remote host is missing an update to libfishsound announced via advisory DSA 1584-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201584-1

It was discovered that libfishsound, a simple programming interface that wraps Xiph.Org audio codecs, didn't correctly handle negative values in a particular header field. This could allow malicious files to execute arbitrary code. For the stable distribution (etch), this problem has been fixed in version 0.7.0-2etch1. For the unstable distribution (sid), this problem has been fixed in version 0.7.0-2.2. We recommend that you upgrade your libfishsound package.