Secunia Security Advisory – KDE has acknowledged a security issue in KDM, which can be exploited by malicious, local users to bypass certain security restrictions.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/59476/sa26894.txt
Source: https://packetstormsecurity.com/files/59476/Secunia-Security-Advisory-26894.html