KDE kppp allows local users to create a directory in an arbitrary location via the HOME environmental variable.

KDE allows local users to execute arbitrary commands by setting the KDEDIR environmental variable to modify the search path that KDE uses to locate its executables.

KDE klock allows local users to kill arbitrary processes by specifying an arbitrary PID in the .kss.pid file.

Buffer overflow in kppp in KDE allows local users to gain root access via a long PATH environmental variable.

KMail in KDE 1.0 provides a PGP passphrase as a command line argument to other programs, which could allow local users to obtain the passphrase and compromise the PGP keys of other users by viewing the arguments via programs that list process information, such as ps.

Buffer overflow in kscreensaver in KDE klock allows local users to gain root privileges via a long HOME environmental variable.