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TITLE:
GTK+ "gdk_window_begin_implicit_paint()" Foreign Windows Weakness

SECUNIA ADVISORY ID:
SA37852

VERIFY ADVISORY:
http://secunia.com/advisories/37852/

DESCRIPTION:
A weakness has been reported in GTK+, which can be exploited by
malicious people with physical access to bypass certain security
restrictions.

The weakness is caused due to the "gdk_window_begin_implicit_paint()"
function in gdk/gdkwindow.c potentially trying to paint on
non-existent foreign windows. This can lead to e.g. a crash in
gnome-screensaver, which can be exploited to bypass the screen lock.

The weakness is reported in version 2.18.4. Other versions may also
be affected.

SOLUTION:
Update to version 2.18.5.

PROVIDED AND/OR DISCOVERED BY:
Crashes reported by e.g. Richard Ssekibuule and various others.

ORIGINAL ADVISORY:
http://ftp.gnome.org/pub/gnome/sources/gtk+/2.18/gtk+-2.18.5.news

https://bugzilla.gnome.org/show_bug.cgi?id=598476
https://bugs.edge.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/446395
https://bugzilla.redhat.com/show_bug.cgi?id=540308

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About:
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Secunia NEVER sends attached files with advisories.
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use those supplied by the vendor.

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