TITLE:
XScreenSaver Insecure Temporary File Creation Vulnerability

SECUNIA ADVISORY ID:
SA20224

VERIFY ADVISORY:
http://secunia.com/advisories/20224/

CRITICAL:
Less critical

IMPACT:
Privilege escalation

WHERE:
Local system

SOFTWARE:
XScreenSaver 4.x
http://secunia.com/product/10125/

DESCRIPTION:
A vulnerability has been reported in XScreenSaver, which can be
exploited by malicious, local users to perform certain actions with
escalated privileges.

The vulnerability is caused due to the temporary files being created
insecurely in the "/tmp" directory by "driver/passwd-kerberos.c", 
"driver/xscreensaver-getimage-video", "driver/xscreensaver.kss.in",
"vidwhacker", and "webcollage". This can be exploited via symlink
attacks to create or overwrite arbitrary files with privileges of the
user running the application.

The vulnerability has been reported in versions prior to 4.15.

SOLUTION:
Update to version 4.15 or later.
http://www.jwz.org/xscreensaver/download.html

PROVIDED AND/OR DISCOVERED BY:
SUSE

ORIGINAL ADVISORY:
Red Hat Bugzilla:
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=182286

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