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Category:   Application (Generic)  >   X Vendors:   X.org
(Red Hat Issues Fix) X xrdb Input Validation Flaw in Processing Hostname Lets Remote Users Execute Arbitrary Commands
SecurityTracker Alert ID:  1025319
SecurityTracker URL:  http://securitytracker.com/id/1025319
CVE Reference:   CVE-2011-0465   (Links to External Site)
Date:  Apr 12 2011
Impact:   Execution of arbitrary code via network, Root access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): X11R7.6 (xrdb prior to 1.0.9)
Description:   A vulnerability was reported in X. A remote user can execute arbitrary commands on the target system.

A remote user can send specially crafted hostname values (containing shell escape characters) to the target system to execute arbitrary commands on the target system with root privileges when a display manager reads in the resource database via xrdb.

Systems that set their hostname via DHCP are affected (if the dhcp client permits hostnames with illegal characters).

Systems that allow remote logins via xdmcp are affected.

Sebastian Krahmer from the SUSE security team reported this vulnerability.

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

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2011-0433.html

Vendor URL:  x.org/ (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  5, 6

Message History:   This archive entry is a follow-up to the message listed below.
Apr 12 2011 X xrdb Input Validation Flaw in Processing Hostname Lets Remote Users Execute Arbitrary Commands



 Source Message Contents

Subject:  [RHSA-2011:0433-01] Moderate: xorg-x11-server-utils security update

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

Synopsis:          Moderate: xorg-x11-server-utils security update
Advisory ID:       RHSA-2011:0433-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2011-0433.html
Issue date:        2011-04-11
CVE Names:         CVE-2011-0465 
=====================================================================

1. Summary:

An updated xorg-x11-server-utils package that fixes one security issue is
now available for Red Hat Enterprise Linux 5 and 6.

The Red Hat Security Response Team has rated this update as having moderate
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:

Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64
Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64
Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64

3. Description:

The xorg-x11-server-utils package contains a collection of utilities used
to modify and query the runtime configuration of the X.Org server. X.Org is
an open source implementation of the X Window System.

A flaw was found in the X.Org X server resource database utility, xrdb.
Certain variables were not properly sanitized during the launch of a user's
graphical session, which could possibly allow a remote attacker to execute
arbitrary code with root privileges, if they were able to make the display
manager execute xrdb with a specially-crafted X client hostname. For
example, by configuring the hostname on the target system via a crafted
DHCP reply, or by using the X Display Manager Control Protocol (XDMCP) to
connect to that system from a host that has a special DNS name.
(CVE-2011-0465)

Red Hat would like to thank Matthieu Herrb for reporting this issue.
Upstream acknowledges Sebastian Krahmer of the SuSE Security Team as the
original reporter.

Users of xorg-x11-server-utils should upgrade to this updated package,
which contains 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
https://access.redhat.com/kb/docs/DOC-11259

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

680196 - CVE-2011-0465 xorg: xrdb code execution via crafted X client hostname

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-utils-7.1-5.el5_6.1.src.rpm

i386:
xorg-x11-server-utils-7.1-5.el5_6.1.i386.rpm
xorg-x11-server-utils-debuginfo-7.1-5.el5_6.1.i386.rpm

x86_64:
xorg-x11-server-utils-7.1-5.el5_6.1.x86_64.rpm
xorg-x11-server-utils-debuginfo-7.1-5.el5_6.1.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-utils-7.1-5.el5_6.1.src.rpm

i386:
xorg-x11-server-utils-7.1-5.el5_6.1.i386.rpm
xorg-x11-server-utils-debuginfo-7.1-5.el5_6.1.i386.rpm

ia64:
xorg-x11-server-utils-7.1-5.el5_6.1.ia64.rpm
xorg-x11-server-utils-debuginfo-7.1-5.el5_6.1.ia64.rpm

ppc:
xorg-x11-server-utils-7.1-5.el5_6.1.ppc.rpm
xorg-x11-server-utils-debuginfo-7.1-5.el5_6.1.ppc.rpm

s390x:
xorg-x11-server-utils-7.1-5.el5_6.1.s390x.rpm
xorg-x11-server-utils-debuginfo-7.1-5.el5_6.1.s390x.rpm

x86_64:
xorg-x11-server-utils-7.1-5.el5_6.1.x86_64.rpm
xorg-x11-server-utils-debuginfo-7.1-5.el5_6.1.x86_64.rpm

Red Hat Enterprise Linux Desktop (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/xorg-x11-server-utils-7.4-15.el6_0.1.src.rpm

i386:
xorg-x11-server-utils-7.4-15.el6_0.1.i686.rpm
xorg-x11-server-utils-debuginfo-7.4-15.el6_0.1.i686.rpm

x86_64:
xorg-x11-server-utils-7.4-15.el6_0.1.x86_64.rpm
xorg-x11-server-utils-debuginfo-7.4-15.el6_0.1.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-utils-7.4-15.el6_0.1.src.rpm

x86_64:
xorg-x11-server-utils-7.4-15.el6_0.1.x86_64.rpm
xorg-x11-server-utils-debuginfo-7.4-15.el6_0.1.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-utils-7.4-15.el6_0.1.src.rpm

i386:
xorg-x11-server-utils-7.4-15.el6_0.1.i686.rpm
xorg-x11-server-utils-debuginfo-7.4-15.el6_0.1.i686.rpm

ppc64:
xorg-x11-server-utils-7.4-15.el6_0.1.ppc64.rpm
xorg-x11-server-utils-debuginfo-7.4-15.el6_0.1.ppc64.rpm

s390x:
xorg-x11-server-utils-7.4-15.el6_0.1.s390x.rpm
xorg-x11-server-utils-debuginfo-7.4-15.el6_0.1.s390x.rpm

x86_64:
xorg-x11-server-utils-7.4-15.el6_0.1.x86_64.rpm
xorg-x11-server-utils-debuginfo-7.4-15.el6_0.1.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-utils-7.4-15.el6_0.1.src.rpm

i386:
xorg-x11-server-utils-7.4-15.el6_0.1.i686.rpm
xorg-x11-server-utils-debuginfo-7.4-15.el6_0.1.i686.rpm

x86_64:
xorg-x11-server-utils-7.4-15.el6_0.1.x86_64.rpm
xorg-x11-server-utils-debuginfo-7.4-15.el6_0.1.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://access.redhat.com/security/team/key/#package

7. References:

https://www.redhat.com/security/data/cve/CVE-2011-0465.html
https://access.redhat.com/security/updates/classification/#moderate

8. Contact:

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

Copyright 2011 Red Hat, Inc.
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