The remote host is missing an update to netatalk announced via advisory DSA 1704-2.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201704-2

The update in DSA 1704-1 was incomplete as it missed to escape a few important characters which enabled an attacker to overwrite arbitrary files. It was discovered that netatalk, an implementation of the AppleTalk suite, is affected by a command injection vulnerability when processing PostScript streams via papd. This is leading to arbitrary remote code execution. Note that this only affects installations that are configured to use a pipe command in combination with wildcard symbols substituted with values of the printed job. For the stable distribution (etch) this problem has been fixed in version 2.0.3-4+etch2. For the unstable distribution (sid) this problem has been fixed in version 2.0.4~beta2-1.1. We recommend that you upgrade your netatalk package.