clutter, cogl, gnome, mutter security update

CentOS Errata and Security Advisory CESA-2015:0535

GNOME Shell and the packages it depends upon provide the core user interface of
the Red Hat Enterprise Linux desktop, including functions such as navigating
between windows and launching applications.

It was found that the GNOME shell did not disable the Print Screen key when the
screen was locked. This could allow an attacker with physical access to a system
with a locked screen to crash the screen-locking application by creating a large
amount of screenshots. (CVE-2014-7300)

This update also fixes the following bugs:

• The Timed Login feature, which automatically logs in a specified user after a
  specified period of time, stopped working after the first user of the GUI logged
  out. This has been fixed, and the specified user is always logged in if no one
  else logs in. (BZ#1043571)

• If two monitors were arranged vertically with the secondary monitor above the
  primary monitor, it was impossible to move windows onto the secondary monitor.
  With this update, windows can be moved through the upper edge of the first
  monitor to the secondary monitor. (BZ#1075240)

• If the Gnome Display Manager (GDM) user list was disabled and a user entered
  the user name, the password prompt did not appear. Instead, the user had to
  enter the user name one more time. The GDM code that contained this error has
  been fixed, and users can enter their user names and passwords as expected.
  (BZ#1109530)

• Prior to this update, only a small area was available on the GDM login screen
  for a custom text banner. As a consequence, when a long banner was used, it did
  not fit into the area, and the person reading the banner had to use scrollbars
  to view the whole text. With this update, more space is used for the banner if
  necessary, which allows the user to read the message conveniently. (BZ#1110036)

• When the Cancel button was pressed while an LDAP user name and password was
  being validated, the GDM code did not handle the situation correctly. As a
  consequence, GDM became unresponsive, and it was impossible to return to the
  login screen. The affected code has been fixed, and LDAP user validation can be
  canceled, allowing another user to log in instead. (BZ#1137041)

• If the window focus mode in GNOME was set to “mouse” or “sloppy”, navigating
  through areas of a pop-up menu displayed outside its parent window caused the
  window to lose its focus. Consequently, the menu was not usable. This has been
  fixed, and the window focus is kept in under this scenario. (BZ#1149585)

• If user authentication is configured to require a smart card to log in, user
  names are obtained from the smart card. The authentication is then performed by
  entering the smart card PIN. Prior to this update, the login screen allowed a
  user name to be entered if no smart card was inserted, but due to a bug in the
  underlying code, the screen became unresponsive. If, on the other hand, a smart
  card was used for authentication, the user was logged in as soon as the
  authentication was complete. As a consequence, it was impossible to select a
  session other than GNOME Classic. Both of these problems have been fixed. Now, a
  smart card is required when this type of authentication is enabled, and any
  other installed session can be selected by the user. (BZ#1159385, BZ#1163474)

In addition, this update adds the following enhancement:

• Support for quad-buffer OpenGL stereo visuals has been added. As a result,
  OpenGL applications that use quad-buffer stereo can be run and properly
  displayed within the GNOME desktop when used with a video driver and hardware
  with the necessary capabilities. (BZ#861507, BZ#1108890, BZ#1108891, BZ#1108893)

All GNOME Shell users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues and add this enhancement.

Merged security bulletin from advisories:
https://lists.centos.org/pipermail/centos-cr-announce/2015-March/027778.html
https://lists.centos.org/pipermail/centos-cr-announce/2015-March/027779.html
https://lists.centos.org/pipermail/centos-cr-announce/2015-March/027835.html
https://lists.centos.org/pipermail/centos-cr-announce/2015-March/027958.html

Affected packages:
clutter
clutter-devel
clutter-doc
cogl
cogl-devel
cogl-doc
gnome-shell
gnome-shell-browser-plugin
mutter
mutter-devel

Upstream details at:
https://access.redhat.com/errata/RHSA-2015:0535