IBM SECURITY ADVISORY First Issued: Wed Feb 22 15:00:38 CST 2012 | Updated: Mon Feb 27 09:38:53 CST 2012 | The link to the fixes corrected. | The ifixes updated to include previous fixes for the | CVE-2007-6427 and CVE-2007-6429 | Updated: Thu Dec 12 12:55:11 CST 2013 | Update: 1. Added KEYs for parsing purposes | 2. Moved to OpenSSL signature The most recent version of this document is available here: http://aix.software.ibm.com/aix/efixes/security/X_advisory2.asc =============================================================================== VULNERABILITY SUMMARY 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 CVSS=4.6 Reboot required? NO Workarounds? NO Protected by FPM? NO Protected by SED? NO =============================================================================== DETAILED INFORMATION I. DESCRIPTION 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 server. The following commands are vulnerable: /usr/bin/X11/X II. CVSS CVSS Base Score: 4.6 CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/70401 for the current score 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 KEY ---------------------------------------------------------- X11.base.rte 6.1.4.0 6.1.4.3 key_w_fs X11.base.rte 6.1.5.0 6.1.5.2 key_w_fs X11.base.rte 6.1.6.0 6.1.6.17 key_w_fs X11.base.rte 6.1.7.0 6.1.7.2 key_w_fs X11.base.rte 7.1.0.0 7.1.0.16 key_w_fs X11.base.rte 7.1.1.0 7.1.1.2 key_w_fs IV. SOLUTIONS A. APARS IBM has assigned the following APARs to this problem: AIX Level APAR Availability SP KEY --------------------------------------------------- 6.1.5 IV15633 TBD sp9 key_w_apar 6.1.6 IV15634 TBD sp8 key_w_apar 6.1.7 IV15747 TBD sp4 key_w_apar 7.1.0 IV15635 TBD sp6 key_w_apar 7.1.1 IV15746 TBD sp4 key_w_apar Subscribe to the APARs here: http://www.ibm.com/support/docview.wss?uid=isg1IV15633 http://www.ibm.com/support/docview.wss?uid=isg1IV15634 http://www.ibm.com/support/docview.wss?uid=isg1IV15747 http://www.ibm.com/support/docview.wss?uid=isg1IV15635 http://www.ibm.com/support/docview.wss?uid=isg1IV15746 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. B. FIXES Fixes are available. The fixes can be downloaded via ftp from: | ftp://aix.software.ibm.com/aix/efixes/security/X_ifix2.tar The link above is to a tar file containing this signed advisory, fix packages, and OpenSSL signatures for each package. The fixes below include prerequisite checking. This will enforce the correct mapping between the fixes and AIX Technology Levels. AIX Level Interim Fix (*.Z) KEY ------------------------------------------------------------------- | 6.1.5 85215.610.120223.epkg.Z key_w_fix | 6.1.6 85215.610.120223.epkg.Z key_w_fix | 6.1.7 85215.610.120223.epkg.Z key_w_fix | 7.1.0 85215.710.120223.epkg.Z key_w_fix | 7.1.1 85215.710.120223.epkg.Z key_w_fix To extract the fixes from the tar file: tar xvf X_ifix2.tar cd X_ifix2 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 ------------------------------------------------------------------ | 9343594afff989971a14dde68ae94ce6d5a81a14 85215.610.120223.epkg.Z | 10702772d4d322058c42b32e507566df0a56a665 85215.710.120223.epkg.Z 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 OpenSSL 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 security-alert@austin.ibm.com and describe the discrepancy. openssl dgst -sha1 -verify AIX_PSIRT_pub.asc -signature file.asc.sig file.asc 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: http://www14.software.ibm.com/webapp/set2/sas/f/aix.efixmgmt/home.html 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. V. WORKAROUNDS The X server can be disabled and then killed with the following commands: /usr/dt/bin/dtconfig -d /usr/dt/bin/dtconfig -kill The X Server can be restored after applying the fix with the following commands: /usr/dt/bin/dtconfig -e /usr/bin/startsrc -s dtsrc VI. CONTACT INFORMATION If you would like to receive AIX Security Advisories via email, please visit: http://www.ibm.com/systems/support and click on the "My notifications" link. To view previously issued advisories, please visit: http://www14.software.ibm.com/webapp/set2/subscriptions/pqvcmjd Comments regarding the content of this announcement can be directed to: security-alert@austin.ibm.com To obtain the OpenSSL public key that can be used to verify the signed advisories and ifixes: Download the key from our web page: http://www.ibm.com/systems/resources/systems_p_os_aix_security_pubkey.txt 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: security-alert@austin.ibm.com B. Download the key from a PGP Public Key Server. The key ID is: 0x28BFAA12 Please contact your local IBM AIX support center for any assistance. 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. VII. REFERENCES: Note: Keywords labeled as KEY in this document are used for parsing purposes. Complete CVSS Guide: http://www.first.org/cvss/cvss-guide.html On-line Calculator V2: http://nvd.nist.gov/cvss.cfm?calculator&adv&version=2 X-Force Vulnerability Database: http://xforce.iss.net/xforce/xfdb/70401 CVE-2010-4819: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-4819 *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 VULNERABILITY.