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Test ID:1.3.6.1.4.1.25623.1.0.870548
Category:Red Hat Local Security Checks
Title:RedHat Update for xorg-x11-server RHSA-2012:0303-03
Summary:The remote host is missing an update for the 'xorg-x11-server'; package(s) announced via the referenced advisory.
Description:Summary:
The remote host is missing an update for the 'xorg-x11-server'
package(s) announced via the referenced advisory.

Vulnerability Insight:
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)

Red Hat would like to thank the researcher with the nickname vladz for
reporting this issue.

This update also fixes the following bugs:

* In rare cases, if the front and back buffer of the miDbePositionWindow()
function were not both allocated in video memory, or were both allocated in
system memory, the X Window System sometimes terminated unexpectedly. A
patch has been provided to address this issue and X no longer crashes in
the described scenario. (BZ#596899)

* Previously, when the miSetShape() function called the miRegionDestroy()
function with a NULL region, X terminated unexpectedly if the backing store
was enabled. Now, X no longer crashes in the described scenario.
(BZ#676270)

* On certain workstations running in 32-bit mode, the X11 mouse cursor
occasionally became stuck near the left edge of the X11 screen. A patch has
been provided to address this issue and the mouse cursor no longer becomes
stuck in the described scenario. (BZ#529717)

* On certain workstations with a dual-head graphics adapter using the r500
driver in Zaphod mode, the mouse pointer was confined to one monitor screen
and could not move to the other screen. A patch has been provided to
address this issue and the mouse cursor works properly across both screens.
(BZ#559964)

* Due to a double free operation, Xvfb (X virtual framebuffer) terminated
unexpectedly with a segmentation fault randomly when the last client
disconnected, that is when the server reset. This bug has been fixed in the
miDCCloseScreen() function and Xvfb no longer crashes. (BZ#674741)

* Starting the Xephyr server on an AMD64 or Intel 64 architecture with an
integrated graphics adapter caused the server to terminate unexpectedly.
This bug has been fixed in the code and Xephyr no longer crashes in the
described scenario. (BZ#454409)

* Previously, when a client made a request bigger than 1/4th of the limit
advertised in the BigRequestsEnable reply, the X server closed the
connection unexpectedly. With this update, the maxBigRequestSize variable
has been added to the code to check the size ...

Description truncated, please see the referenced URL(s) for more information.

Affected Software/OS:
xorg-x11-server on Red Hat Enterprise Linux (v. 5 server)

Solution:
Please Install the Updated Packages.

CVSS Score:
1.2

CVSS Vector:
AV:L/AC:H/Au:N/C:P/I:N/A:N

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2011-4028
http://lists.freedesktop.org/archives/xorg/2011-October/053680.html
RedHat Security Advisories: RHSA-2012:0939
http://rhn.redhat.com/errata/RHSA-2012-0939.html
http://secunia.com/advisories/46460
http://secunia.com/advisories/49579
CopyrightCopyright (c) 2012 Greenbone Networks GmbH

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