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Category:   Application (Generic)  >   X Vendors:   X.org
(Red Hat Issues Fix) X.org Xserver mod() Calculation Error Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1023930
SecurityTracker URL:  http://securitytracker.com/id/1023930
CVE Reference:   CVE-2010-1166   (Links to External Site)
Date:  Apr 28 2010
Impact:   Execution of arbitrary code via network, Root access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in X.org Xserver. A remote user can execute arbitrary code on the target system.

The X.Org Render extension contains a calculation flaw in the mod() function. A remote authorized client can send specially crafted data to the connected X server to cause the target X server to crash or execute arbitrary code with root privileges.

Impact:   A remote user can execute arbitrary code on the target system.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2010-0382.html

Vendor URL:  x.org/ (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  5

Message History:   This archive entry is a follow-up to the message listed below.
Apr 28 2010 X.org Xserver mod() Calculation Error Lets Remote Users Execute Arbitrary Code



 Source Message Contents

Subject:  [RHSA-2010:0382-01] Important: xorg-x11-server security update

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: xorg-x11-server security update
Advisory ID:       RHSA-2010:0382-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2010-0382.html
Issue date:        2010-04-28
CVE Names:         CVE-2010-1166 
=====================================================================

1. Summary:

Updated xorg-x11-server packages that fix one security issue are now
available for Red Hat Enterprise Linux 5.

The Red Hat Security Response Team has rated this update as having
important security impact. A Common Vulnerability Scoring System (CVSS)
base score, which gives a detailed severity rating, is available from the
CVE link in the References section.

2. Relevant releases/architectures:

RHEL Desktop Workstation (v. 5 client) - i386, x86_64
Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64
Red Hat Enterprise Linux Desktop (v. 5 client) - i386, 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.

An incorrect calculation flaw was discovered in the X.Org Render extension.
A malicious, authorized client could exploit this issue to crash the X.Org
server or, potentially, execute arbitrary code with root privileges.
(CVE-2010-1166)

Users of xorg-x11-server should upgrade to these updated packages, which
contain a backported patch to resolve this issue. 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
http://kbase.redhat.com/faq/docs/DOC-11259

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

495733 - Xorg crashes with latest firefox
582601 - CVE-2010-1166 Xorg: X server Render extension memory corruption

6. Package List:

Red Hat Enterprise Linux Desktop (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/xorg-x11-server-1.1.1-48.76.el5_5.1.src.rpm

i386:
xorg-x11-server-Xdmx-1.1.1-48.76.el5_5.1.i386.rpm
xorg-x11-server-Xephyr-1.1.1-48.76.el5_5.1.i386.rpm
xorg-x11-server-Xnest-1.1.1-48.76.el5_5.1.i386.rpm
xorg-x11-server-Xorg-1.1.1-48.76.el5_5.1.i386.rpm
xorg-x11-server-Xvfb-1.1.1-48.76.el5_5.1.i386.rpm
xorg-x11-server-Xvnc-source-1.1.1-48.76.el5_5.1.i386.rpm
xorg-x11-server-debuginfo-1.1.1-48.76.el5_5.1.i386.rpm

x86_64:
xorg-x11-server-Xdmx-1.1.1-48.76.el5_5.1.x86_64.rpm
xorg-x11-server-Xephyr-1.1.1-48.76.el5_5.1.x86_64.rpm
xorg-x11-server-Xnest-1.1.1-48.76.el5_5.1.x86_64.rpm
xorg-x11-server-Xorg-1.1.1-48.76.el5_5.1.x86_64.rpm
xorg-x11-server-Xvfb-1.1.1-48.76.el5_5.1.x86_64.rpm
xorg-x11-server-Xvnc-source-1.1.1-48.76.el5_5.1.x86_64.rpm
xorg-x11-server-debuginfo-1.1.1-48.76.el5_5.1.x86_64.rpm

RHEL Desktop Workstation (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/xorg-x11-server-1.1.1-48.76.el5_5.1.src.rpm

i386:
xorg-x11-server-debuginfo-1.1.1-48.76.el5_5.1.i386.rpm
xorg-x11-server-sdk-1.1.1-48.76.el5_5.1.i386.rpm

x86_64:
xorg-x11-server-debuginfo-1.1.1-48.76.el5_5.1.x86_64.rpm
xorg-x11-server-sdk-1.1.1-48.76.el5_5.1.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/xorg-x11-server-1.1.1-48.76.el5_5.1.src.rpm

i386:
xorg-x11-server-Xdmx-1.1.1-48.76.el5_5.1.i386.rpm
xorg-x11-server-Xephyr-1.1.1-48.76.el5_5.1.i386.rpm
xorg-x11-server-Xnest-1.1.1-48.76.el5_5.1.i386.rpm
xorg-x11-server-Xorg-1.1.1-48.76.el5_5.1.i386.rpm
xorg-x11-server-Xvfb-1.1.1-48.76.el5_5.1.i386.rpm
xorg-x11-server-Xvnc-source-1.1.1-48.76.el5_5.1.i386.rpm
xorg-x11-server-debuginfo-1.1.1-48.76.el5_5.1.i386.rpm
xorg-x11-server-sdk-1.1.1-48.76.el5_5.1.i386.rpm

ia64:
xorg-x11-server-Xdmx-1.1.1-48.76.el5_5.1.ia64.rpm
xorg-x11-server-Xephyr-1.1.1-48.76.el5_5.1.ia64.rpm
xorg-x11-server-Xnest-1.1.1-48.76.el5_5.1.ia64.rpm
xorg-x11-server-Xorg-1.1.1-48.76.el5_5.1.ia64.rpm
xorg-x11-server-Xvfb-1.1.1-48.76.el5_5.1.ia64.rpm
xorg-x11-server-Xvnc-source-1.1.1-48.76.el5_5.1.ia64.rpm
xorg-x11-server-debuginfo-1.1.1-48.76.el5_5.1.ia64.rpm
xorg-x11-server-sdk-1.1.1-48.76.el5_5.1.ia64.rpm

ppc:
xorg-x11-server-Xdmx-1.1.1-48.76.el5_5.1.ppc.rpm
xorg-x11-server-Xephyr-1.1.1-48.76.el5_5.1.ppc.rpm
xorg-x11-server-Xnest-1.1.1-48.76.el5_5.1.ppc.rpm
xorg-x11-server-Xorg-1.1.1-48.76.el5_5.1.ppc.rpm
xorg-x11-server-Xvfb-1.1.1-48.76.el5_5.1.ppc.rpm
xorg-x11-server-Xvnc-source-1.1.1-48.76.el5_5.1.ppc.rpm
xorg-x11-server-debuginfo-1.1.1-48.76.el5_5.1.ppc.rpm
xorg-x11-server-sdk-1.1.1-48.76.el5_5.1.ppc.rpm

s390x:
xorg-x11-server-Xephyr-1.1.1-48.76.el5_5.1.s390x.rpm
xorg-x11-server-Xnest-1.1.1-48.76.el5_5.1.s390x.rpm
xorg-x11-server-Xvfb-1.1.1-48.76.el5_5.1.s390x.rpm
xorg-x11-server-Xvnc-source-1.1.1-48.76.el5_5.1.s390x.rpm
xorg-x11-server-debuginfo-1.1.1-48.76.el5_5.1.s390x.rpm

x86_64:
xorg-x11-server-Xdmx-1.1.1-48.76.el5_5.1.x86_64.rpm
xorg-x11-server-Xephyr-1.1.1-48.76.el5_5.1.x86_64.rpm
xorg-x11-server-Xnest-1.1.1-48.76.el5_5.1.x86_64.rpm
xorg-x11-server-Xorg-1.1.1-48.76.el5_5.1.x86_64.rpm
xorg-x11-server-Xvfb-1.1.1-48.76.el5_5.1.x86_64.rpm
xorg-x11-server-Xvnc-source-1.1.1-48.76.el5_5.1.x86_64.rpm
xorg-x11-server-debuginfo-1.1.1-48.76.el5_5.1.x86_64.rpm
xorg-x11-server-sdk-1.1.1-48.76.el5_5.1.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://www.redhat.com/security/team/key/#package

7. References:

https://www.redhat.com/security/data/cve/CVE-2010-1166.html
http://www.redhat.com/security/updates/classification/#important

8. Contact:

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

Copyright 2010 Red Hat, Inc.
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