Mandriva Linux Security Advisory 2009-253 – 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. This update provides a fix for this vulnerability.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/81765/MDVSA-2009-253.txt
Source: https://packetstormsecurity.com/files/81765/Mandriva-Linux-Security-Advisory-2009-253.html