KDM in KDE 3.1.3 and earlier does not verify whether the pam_setcred
function call succeeds, which may allow attackers to gain root
privileges by triggering error conditions within PAM modules, as
demonstrated in certain configurations of the MIT pam_krb5 module.
KDM in KDE 3.1.3 and earlier uses a weak session cookie generation
algorithm that does not provide 128 bits of entropy, which allows
attackers to guess session cookies via brute force methods and gain
access to the user session.
These vulnerabilities are described in the following security
advisory from KDE: