The remote host is missing an update to lpr announced via advisory DSA 267-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20267-1

A buffer overflow has been discovered in lpr, a BSD lpr/lpd line printer spooling system. This problem can be exploited by a local user to gain root privileges, even if the printer system is set up properly. For the stable distribution (woody) this problem has been fixed in version 2000.05.07-4.3. For the old stable distribution (potato) this problem has been fixed in version 0.48-1.1. For the stable distribution (sid) this problem has been fixed in version 2000.05.07-4.20. We recommend that you upgrade your lpr package immediately.