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Red Hat Security Advisory 2012-0939-04

Red Hat Security Advisory 2012-0939-04
Posted Jun 20, 2012
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2012-0939-04 - X.Org is an open source implementation of the X Window System. It provides the basic low-level functionality that full-fledged graphical user interfaces are designed upon. A flaw was found in the way the X.Org server handled lock files. A local user with access to the system console could use this flaw to determine the existence of a file in a directory not accessible to the user, via a symbolic link attack. A race condition was found in the way the X.Org server managed temporary lock files. A local attacker could use this flaw to perform a symbolic link attack, allowing them to make an arbitrary file world readable, leading to the disclosure of sensitive information.

tags | advisory, arbitrary, local
systems | linux, redhat
advisories | CVE-2011-4028, CVE-2011-4029
MD5 | 960725476cdf6e186b95b06971ce3b4e

Red Hat Security Advisory 2012-0939-04

Change Mirror Download
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=====================================================================
Red Hat Security Advisory

Synopsis: Low: xorg-x11-server security and bug fix update
Advisory ID: RHSA-2012:0939-04
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2012-0939.html
Issue date: 2012-06-20
CVE Names: CVE-2011-4028 CVE-2011-4029
=====================================================================

1. Summary:

Updated xorg-x11-server packages that fix two security issues and several
bugs are now available for Red Hat Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having low
security impact. Common Vulnerability Scoring System (CVSS) base scores,
which give detailed severity ratings, are available for each vulnerability
from the CVE links in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, noarch, x86_64
Red Hat Enterprise Linux HPC Node Optional (v. 6) - noarch, x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 6) - i386, noarch, ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64
Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, noarch, x86_64

3. Description:

X.Org is an open source implementation of the X Window System. It provides
the basic low-level functionality that full-fledged graphical user
interfaces are designed upon.

A flaw was found in the way the X.Org server handled lock files. A local
user with access to the system console could use this flaw to determine the
existence of a file in a directory not accessible to the user, via a
symbolic link attack. (CVE-2011-4028)

A race condition was found in the way the X.Org server managed temporary
lock files. A local attacker could use this flaw to perform a symbolic link
attack, allowing them to make an arbitrary file world readable, leading to
the disclosure of sensitive information. (CVE-2011-4029)

Red Hat would like to thank the researcher with the nickname vladz for
reporting these issues.

This update also fixes the following bugs:

* Prior to this update, the KDE Display Manager (KDM) could pass invalid
24bpp pixmap formats to the X server. As a consequence, the X server could
unexpectedly abort. This update modifies the underlying code to pass the
correct formats. (BZ#651934, BZ#722860)

* Prior to this update, absolute input devices, like the stylus of a
graphic tablet, could become unresponsive in the right-most or bottom-most
screen if the X server was configured as a multi-screen setup through
multiple "Device" sections in the xorg.conf file. This update changes the
screen crossing behavior so that absolute devices are always mapped across
all screens. (BZ#732467)

* Prior to this update, the misleading message "Session active, not
inhibited, screen idle. If you see this test, your display server is broken
and you should notify your distributor." could be displayed after resuming
the system or re-enabling the display, and included a URL to an external
web page. This update removes this message. (BZ#748704)

* Prior to this update, the erroneous input handling code of the Xephyr
server disabled screens on a screen crossing event. The focus was only on
the screen where the mouse was located and only this screen was updated
when the Xephyr nested X server was configured in a multi-screen setup.
This update removes this code and Xephyr now correctly updates screens in
multi-screen setups. (BZ#757792)

* Prior to this update, raw events did not contain relative axis values. As
a consequence, clients which relied on relative values for functioning did
not behave as expected. This update sets the values to the original driver
values instead of the already transformed values. Now, raw events contain
relative axis values as expected. (BZ#805377)

All users of xorg-x11-server are advised to upgrade to these updated
packages, which correct these issues. All running X.Org server instances
must be restarted for this update to take effect.

4. Solution:

Before applying this update, make sure all previously-released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/knowledge/articles/11258

5. Bugs fixed (http://bugzilla.redhat.com/):

732467 - Pointer gets stuck on right-most screen
745024 - CVE-2011-4029 xorg-x11-server: lock file chmod change race condition
745755 - CVE-2011-4028 xorg-x11-server: File existence disclosure vulnerability
748704 - "Session active, not inhibited, screen idle. If you see this test, your display server is broken and you should notify your distributor.
805377 - Regression: raw events do not contain relative values

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/xorg-x11-server-1.10.6-1.el6.src.rpm

i386:
xorg-x11-server-Xephyr-1.10.6-1.el6.i686.rpm
xorg-x11-server-Xorg-1.10.6-1.el6.i686.rpm
xorg-x11-server-common-1.10.6-1.el6.i686.rpm
xorg-x11-server-debuginfo-1.10.6-1.el6.i686.rpm

x86_64:
xorg-x11-server-Xephyr-1.10.6-1.el6.x86_64.rpm
xorg-x11-server-Xorg-1.10.6-1.el6.x86_64.rpm
xorg-x11-server-common-1.10.6-1.el6.x86_64.rpm
xorg-x11-server-debuginfo-1.10.6-1.el6.x86_64.rpm

Red Hat Enterprise Linux Desktop Optional (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/xorg-x11-server-1.10.6-1.el6.src.rpm

i386:
xorg-x11-server-Xdmx-1.10.6-1.el6.i686.rpm
xorg-x11-server-Xnest-1.10.6-1.el6.i686.rpm
xorg-x11-server-Xvfb-1.10.6-1.el6.i686.rpm
xorg-x11-server-debuginfo-1.10.6-1.el6.i686.rpm
xorg-x11-server-devel-1.10.6-1.el6.i686.rpm

noarch:
xorg-x11-server-source-1.10.6-1.el6.noarch.rpm

x86_64:
xorg-x11-server-Xdmx-1.10.6-1.el6.x86_64.rpm
xorg-x11-server-Xnest-1.10.6-1.el6.x86_64.rpm
xorg-x11-server-Xvfb-1.10.6-1.el6.x86_64.rpm
xorg-x11-server-debuginfo-1.10.6-1.el6.i686.rpm
xorg-x11-server-debuginfo-1.10.6-1.el6.x86_64.rpm
xorg-x11-server-devel-1.10.6-1.el6.i686.rpm
xorg-x11-server-devel-1.10.6-1.el6.x86_64.rpm

Red Hat Enterprise Linux HPC Node Optional (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/xorg-x11-server-1.10.6-1.el6.src.rpm

noarch:
xorg-x11-server-source-1.10.6-1.el6.noarch.rpm

x86_64:
xorg-x11-server-Xdmx-1.10.6-1.el6.x86_64.rpm
xorg-x11-server-Xephyr-1.10.6-1.el6.x86_64.rpm
xorg-x11-server-Xnest-1.10.6-1.el6.x86_64.rpm
xorg-x11-server-Xorg-1.10.6-1.el6.x86_64.rpm
xorg-x11-server-Xvfb-1.10.6-1.el6.x86_64.rpm
xorg-x11-server-common-1.10.6-1.el6.x86_64.rpm
xorg-x11-server-debuginfo-1.10.6-1.el6.i686.rpm
xorg-x11-server-debuginfo-1.10.6-1.el6.x86_64.rpm
xorg-x11-server-devel-1.10.6-1.el6.i686.rpm
xorg-x11-server-devel-1.10.6-1.el6.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/xorg-x11-server-1.10.6-1.el6.src.rpm

i386:
xorg-x11-server-Xephyr-1.10.6-1.el6.i686.rpm
xorg-x11-server-Xorg-1.10.6-1.el6.i686.rpm
xorg-x11-server-common-1.10.6-1.el6.i686.rpm
xorg-x11-server-debuginfo-1.10.6-1.el6.i686.rpm

ppc64:
xorg-x11-server-Xephyr-1.10.6-1.el6.ppc64.rpm
xorg-x11-server-Xorg-1.10.6-1.el6.ppc64.rpm
xorg-x11-server-common-1.10.6-1.el6.ppc64.rpm
xorg-x11-server-debuginfo-1.10.6-1.el6.ppc64.rpm

s390x:
xorg-x11-server-Xephyr-1.10.6-1.el6.s390x.rpm
xorg-x11-server-common-1.10.6-1.el6.s390x.rpm
xorg-x11-server-debuginfo-1.10.6-1.el6.s390x.rpm

x86_64:
xorg-x11-server-Xephyr-1.10.6-1.el6.x86_64.rpm
xorg-x11-server-Xorg-1.10.6-1.el6.x86_64.rpm
xorg-x11-server-common-1.10.6-1.el6.x86_64.rpm
xorg-x11-server-debuginfo-1.10.6-1.el6.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/xorg-x11-server-1.10.6-1.el6.src.rpm

i386:
xorg-x11-server-Xdmx-1.10.6-1.el6.i686.rpm
xorg-x11-server-Xnest-1.10.6-1.el6.i686.rpm
xorg-x11-server-Xvfb-1.10.6-1.el6.i686.rpm
xorg-x11-server-debuginfo-1.10.6-1.el6.i686.rpm
xorg-x11-server-devel-1.10.6-1.el6.i686.rpm

noarch:
xorg-x11-server-source-1.10.6-1.el6.noarch.rpm

ppc64:
xorg-x11-server-Xdmx-1.10.6-1.el6.ppc64.rpm
xorg-x11-server-Xnest-1.10.6-1.el6.ppc64.rpm
xorg-x11-server-Xvfb-1.10.6-1.el6.ppc64.rpm
xorg-x11-server-debuginfo-1.10.6-1.el6.ppc.rpm
xorg-x11-server-debuginfo-1.10.6-1.el6.ppc64.rpm
xorg-x11-server-devel-1.10.6-1.el6.ppc.rpm
xorg-x11-server-devel-1.10.6-1.el6.ppc64.rpm

s390x:
xorg-x11-server-Xdmx-1.10.6-1.el6.s390x.rpm
xorg-x11-server-Xnest-1.10.6-1.el6.s390x.rpm
xorg-x11-server-Xvfb-1.10.6-1.el6.s390x.rpm
xorg-x11-server-debuginfo-1.10.6-1.el6.s390x.rpm

x86_64:
xorg-x11-server-Xdmx-1.10.6-1.el6.x86_64.rpm
xorg-x11-server-Xnest-1.10.6-1.el6.x86_64.rpm
xorg-x11-server-Xvfb-1.10.6-1.el6.x86_64.rpm
xorg-x11-server-debuginfo-1.10.6-1.el6.i686.rpm
xorg-x11-server-debuginfo-1.10.6-1.el6.x86_64.rpm
xorg-x11-server-devel-1.10.6-1.el6.i686.rpm
xorg-x11-server-devel-1.10.6-1.el6.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/xorg-x11-server-1.10.6-1.el6.src.rpm

i386:
xorg-x11-server-Xephyr-1.10.6-1.el6.i686.rpm
xorg-x11-server-Xorg-1.10.6-1.el6.i686.rpm
xorg-x11-server-common-1.10.6-1.el6.i686.rpm
xorg-x11-server-debuginfo-1.10.6-1.el6.i686.rpm

x86_64:
xorg-x11-server-Xephyr-1.10.6-1.el6.x86_64.rpm
xorg-x11-server-Xorg-1.10.6-1.el6.x86_64.rpm
xorg-x11-server-common-1.10.6-1.el6.x86_64.rpm
xorg-x11-server-debuginfo-1.10.6-1.el6.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/xorg-x11-server-1.10.6-1.el6.src.rpm

i386:
xorg-x11-server-Xdmx-1.10.6-1.el6.i686.rpm
xorg-x11-server-Xnest-1.10.6-1.el6.i686.rpm
xorg-x11-server-Xvfb-1.10.6-1.el6.i686.rpm
xorg-x11-server-debuginfo-1.10.6-1.el6.i686.rpm
xorg-x11-server-devel-1.10.6-1.el6.i686.rpm

noarch:
xorg-x11-server-source-1.10.6-1.el6.noarch.rpm

x86_64:
xorg-x11-server-Xdmx-1.10.6-1.el6.x86_64.rpm
xorg-x11-server-Xnest-1.10.6-1.el6.x86_64.rpm
xorg-x11-server-Xvfb-1.10.6-1.el6.x86_64.rpm
xorg-x11-server-debuginfo-1.10.6-1.el6.i686.rpm
xorg-x11-server-debuginfo-1.10.6-1.el6.x86_64.rpm
xorg-x11-server-devel-1.10.6-1.el6.i686.rpm
xorg-x11-server-devel-1.10.6-1.el6.x86_64.rpm

These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/#package

7. References:

https://www.redhat.com/security/data/cve/CVE-2011-4028.html
https://www.redhat.com/security/data/cve/CVE-2011-4029.html
https://access.redhat.com/security/updates/classification/#low

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2012 Red Hat, Inc.
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