The remote host is missing an update to calife announced via advisory DSA 461-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20461-1

Calife, a program which provides super user privileges to specific users, was found to contain a buffer overflow related to the getpass(3) library function. A local attacker could potentially exploit this vulnerability, given knowledge of a local user's password and the presence of at least one entry in /etc/calife.auth, to execute arbitrary code with root privileges. For the current stable distribution (woody) this problem has been fixed in version 2.8.4c-1woody1. For the unstable distribution (sid) this problem has been fixed in version 2.8.6-1. We recommend that you update your calife package.