The remote host is missing an update to backupninja announced via advisory DSA 827-1. Moritz Muehlenhoff discovered the handler code for backupninja creates a temporary file with a predictable filename, leaving it vulnerable to a symlink attack. The old stable distribution (woody) does not contain the backupninja package.

For the stable distribution (sarge) this problem has been fixed in version 0.5-3sarge1. For the unstable distribution (sid) this problem has been fixed in version 0.8-2. We recommend that you upgrade your backupninja package. https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20827-1