Mandriva Linux Security Advisory 2010-040 – Multiple vulnerabilities has been discovered and corrected in gnome-screensaver 2.28.0 does not resume adherence to its activation settings after an inhibiting application becomes unavailable on the session bus, which allows physically proximate attackers to access an unattended workstation on which screen locking had been intended. gnome-screensaver before 2.28.2 allows physically proximate attackers to bypass screen locking and access an unattended workstation by moving the mouse position to an external monitor and then disconnecting that monitor. This update provides gnome-screensaver 2.28.3, which is not vulnerable to these issues.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/86439/MDVSA-2010-040.txt
Source: https://packetstormsecurity.com/files/86439/Mandriva-Linux-Security-Advisory-2010-040.html