(IBM Issues Fix for AIX) X Input Validation Flaw in ProcRenderAddGlyphs() Lets Local Users Obtain Memory Contents and Deny Service
SecurityTracker Alert ID: 1026728|
SecurityTracker URL: http://securitytracker.com/id/1026728
(Links to External Site)
Date: Feb 23 2012
Denial of service via local system, Disclosure of system information|
Fix Available: Yes Vendor Confirmed: Yes |
A vulnerability was reported in X. A local user can obtain portions of server process memory. A local user can cause denial of service conditions.|
A local user can exploit a flaw in ProcRenderAddGlyphs() to cause the server process to leak arbitrary memory contents and potentially crash.
A local user can cause denial of service conditions on the target system.|
A local user can obtain portions of server process memory.
IBM has issued a fix for IBM AIX (APARs IV15633, IV15634, IV15747, IV15635, IV15746).|
The IBM advisory is available at:
Vendor URL: x.org/ (Links to External Site)
Access control error|
This archive entry is a follow-up to the message listed below.|
Source Message Contents
Date: Thu, 23 Feb 2012 01:48:35 +0000|
Subject: IBM AIX
-----BEGIN PGP SIGNED MESSAGE-----
IBM SECURITY ADVISORY
First Issued: Wed Feb 22 15:00:38 CST 2012
The most recent version of this document is available here:
VULNERABILITY: Memory leak vulnerability in AIX X-server
PLATFORMS: AIX 6.1 and 7.1
SOLUTION: Apply the fix as described below.
THREAT: An attacker may execute arbitrary code with root privileges.
CVE Number: CVE-2010-4819
Reboot required? NO
Protected by FPM? NO
Protected by SED? NO
An input sanitization flaw was found in the X.Org Render extension.
A malicious, authorized client could use this flaw to leak arbitrary
memory from the X.Org server process, or possibly crash the X.Org
The following commands are vulnerable:
CVSS Base Score: 4.6
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/70401 for the
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:L/AC:L/Au:N/C:P/I:P/A:P)
III. PLATFORM VULNERABILITY ASSESSMENT
To determine if your system is vulnerable, run the following command:
# lslpp -L X11.base.rte
The following filesets are vulnerable:
AIX Fileset Lower Level Upper Level
X11.base.rte 220.127.116.11 18.104.22.168
X11.base.rte 22.214.171.124 126.96.36.199
X11.base.rte 188.8.131.52 184.108.40.206
X11.base.rte 220.127.116.11 18.104.22.168
X11.base.rte 22.214.171.124 126.96.36.199
X11.base.rte 188.8.131.52 184.108.40.206
IBM has assigned the following APARs to this problem:
AIX Level APAR number Availability
6.1.5 IV15633 sp9 TBD
6.1.6 IV15634 sp8 TBD
6.1.7 IV15747 sp4 TBD
7.1.0 IV15635 sp6 TBD
7.1.1 IV15746 sp4 TBD
Subscribe to the APARs here:
By subscribing, you will receive periodic email alerting you
to the status of the APAR, and a link to download the fix once
it becomes available.
Fixes are available. The fixes can be downloaded via ftp
The link above is to a tar file containing this signed
advisory, fix packages, and PGP signatures for each package.
The fixes below include prerequisite checking. This will
enforce the correct mapping between the fixes and AIX
AIX Level Interim Fix (*.Z)
To extract the fixes from the tar file:
tar xvf X_ifix2.tar
Verify you have retrieved the fixes intact:
The checksums below were generated using the
csum -h SHA1" (sha1sum) command
and are as follows:
csum -h SHA1 (sha1sum) filename
To verify the sums, use the text of this advisory as input to
csum. For example:
csum -h SHA1 -i X_advisory2.asc
These sums should match exactly. The PGP signatures in the tar
file and on this advisory can also be used to verify the
integrity of the fixes. If the sums or signatures cannot be
confirmed, contact IBM AIX Security at
firstname.lastname@example.org and describe the discrepancy.
C. FIX AND INTERIM FIX INSTALLATION
IMPORTANT: If possible, it is recommended that a mksysb backup
of the system be created. Verify it is both bootable and
readable before proceeding.
To preview a fix installation:
installp -a -d fix_name -p all # where fix_name is the name of the
# fix package being previewed.
To install a fix package:
installp -a -d fix_name -X all # where fix_name is the name of the
# fix package being installed.
Interim fixes have had limited functional and regression
testing but not the full regression testing that takes place
for Service Packs; thus, IBM does not warrant the fully
correct functionality of an interim fix.
Interim fix management documentation can be found at:
To preview an interim fix installation:
emgr -e ipkg_name -p # where ipkg_name is the name of the
# interim fix package being previewed.
To install an interim fix package:
emgr -e ipkg_name -X # where ipkg_name is the name of the
# interim fix package being installed.
The X server can be disabled and then killed with the following
The X Server can be restored after applying the fix with the
/usr/bin/startsrc -s dtsrc
VI. CONTACT INFORMATION
If you would like to receive AIX Security Advisories via email,
and click on the "My notifications" link.
To view previously issued advisories, please visit:
Comments regarding the content of this announcement can be
To request the PGP public key that can be used to communicate
securely with the AIX Security Team you can either:
A. Send an email with "get key" in the subject line to:
B. Download the key from a PGP Public Key Server. The key ID is:
Please contact your local IBM AIX support center for any
eServer is a trademark of International Business Machines
Corporation. IBM, AIX and pSeries are registered trademarks of
International Business Machines Corporation. All other trademarks
are property of their respective holders.
Complete CVSS Guide: http://www.first.org/cvss/cvss-guide.html
On-line Calculator V2:
X-Force Vulnerability Database: http://xforce.iss.net/xforce/xfdb/70401
*The CVSS Environment Score is customer environment specific and will
ultimately impact the Overall CVSS Score. Customers can evaluate the
impact of this vulnerability in their environments by accessing the links
in the Reference section of this Flash.
Note: According to the Forum of Incident Response and Security Teams
(FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry
open standard designed to convey vulnerability severity and help to
determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES
"AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE
RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.7 (AIX)
-----END PGP SIGNATURE-----