The remote host is missing an update to logwatch announced via advisory USN-1078-1.
Details follow:
Dominik George discovered that logwatch did not properly sanitize log file names that were passed to the shell as part of a command. If a remote attacker were able to generate specially crafted filenames (for example, via Samba logging), they could execute arbitrary code with root privileges.
Solution: The problem can be corrected by upgrading your system to the following package versions: