kdebase - privilege escalation

Sebastian Krahmer discovered that a race condition in the KDE Desktop
Environment’s KDM display manager, allow a local user to elevate privileges
to root.

For the stable distribution (lenny), this problem has been fixed in version
4:3.5.9.dfsg.1-6+lenny1.

For the unstable distribution (sid), this problem will be fixed soon.

We recommend that you upgrade your kdm package.