Xscreensaver before 4.15 creates temporary files insecurely in (1)
driver/passwd-kerberos.c, (2) driver/xscreensaver-getimage-video, (3)
driver/xscreensaver.kss.in, and the (4) vidwhacker and (5) webcollage
screensavers, which allows local users to overwrite arbitrary files
via a symlink attack.
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