The remote host is missing an update to backuppc announced via advisory MDVSA-2009:253.

To upgrade automatically use MandrakeUpdate or urpmi. The verification of md5 checksums and GPG signatures is performed automatically for you. https://secure1.securityspace.com/smysecure/catid.html?in=MDVSA-2009:253

A vulnerability was discovered and corrected in backuppc: CgiUserConfigEdit in BackupPC 3.1.0, when SSH keys and Rsync are in use in a multi-user environment, does not restrict users from the ClientNameAlias function, which allows remote authenticated users to read and write sensitive files by modifying ClientNameAlias to match another system, then initiating a backup or restore (CVE-2009-3369). This update provides a fix for this vulnerability. Affected: Enterprise Server 5.0