-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 IBM SECURITY ADVISORY First Issued: Tue Jan 21 14:01:02 CST 2014 | Updated: Tue Feb 4 12:58:33 CDT 2014 | Update: Fix installation updated | Update: Ifixes for 6.1.9 and 7.1.3 and VIOS http://aix.software.ibm.com/aix/efixes/security/xorg_advisory2.asc https://aix.software.ibm.com/aix/efixes/security/xorg_advisory2.asc ftp://aix.software.ibm.com/aix/efixes/security/xorg_advisory2.asc =============================================================================== VULNERABILITY SUMMARY VULNERABILITY: Vulnerability in the X server on AIX PLATFORMS: AIX 5.3 Service Extension, 6.1, and 7.1 releases | VIOS 2.2.x SOLUTION: Apply the fix described below. THREAT: See below. CVE Number: CVE-2013-4396 Reboot required? NO Workarounds? NO Protected by FPM? NO Protected by SED? NO =============================================================================== DETAILED INFORMATION I. DESCRIPTION Use-after-free vulnerability in the doImageText function in dix/dixfonts.c in the xorg-server module before 1.14.4 in X.Org X11 allows remote authenticated users to cause a denial of service (daemon crash) or possibly execute arbitrary code via a crafted ImageText request that triggers memory-allocation failure. II. CVSS CVSS Base Score: 5.5 CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/87768 for the current score CVSS Environmental Score*: Undefined CVSS Vector: (AV:N/AC:L/Au:S/C:N/I:P/A:P) III. PLATFORM VULNERABILITY ASSESSMENT To determine if your system is vulnerable, run the following command: # lslpp -l | grep X11.base.rte The following filesets are vulnerable: AIX Fileset Lower Level Upper Level KEY -------------------------------------------------------------- X11.base.rte 5.3.12.0 5.3.12.01 key_w_fs X11.base.rte 6.1.7.0 6.1.7.16 key_w_fs X11.base.rte 6.1.8.0 6.1.8.0 key_w_fs | X11.base.rte 6.1.9.0 6.1.9.2 key_w_fs X11.base.rte 7.1.1.0 7.1.1.15 key_w_fs X11.base.rte 7.1.2.0 7.1.2.0 key_w_fs | X11.base.rte 7.1.3.0 7.1.3.2 key_w_fs IV. SOLUTIONS A. APARS IBM has assigned the following APARs to this problem: AIX Level APAR number Availability SP KEY ----------------------------------------------------------------- | 5.3.12 IV53331 03/14/2014 SP9 key_w_apar | 6.1.7 IV52181 08/29/2014 SP10 key_w_apar | 6.1.8 IV52184 08/29/2014 SP5 key_w_apar | 6.1.9 IV52978 06/03/2014 SP3 key_w_apar | 7.1.1 IV52185 08/29/2014 SP10 key_w_apar | 7.1.2 IV52186 08/29/2014 SP5 key_w_apar | 7.1.3 IV53246 06/03/2014 SP3 key_w_apar B. FIXES Fixes are available. The fixes can be downloaded via ftp from: ftp://aix.software.ibm.com/aix/efixes/security/xorg_ifix2.tar 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 Technology Levels. AIX Level Interim Fix (*.Z) KEY ------------------------------------------------------------------- 5.3.12 IV53331s0a.131220.epkg.Z key_w_fix 6.1.7 IV52181s0a.131220.epkg.Z key_w_fix 6.1.8 IV52184s0a.131220.epkg.Z key_w_fix | 6.1.9 IV52978s0a.140128.epkg.Z key_w_fix 7.1.1 IV52185s0a.131220.epkg.Z key_w_fix 7.1.2 IV52186s0a.131220.epkg.Z key_w_fix | 7.1.3 IV53246s0a.140128.epkg.Z key_w_fix | VIOS Level Interim Fix (*.Z) | ------------------------------------------------------------------- | 2.2.1.9 IV52181s0a.131220.epkg.Z | 2.2.2.5 IV52184s0a.131220.epkg.Z | 2.2.3.3 IV52978s0a.140128.epkg.Z To extract the fixes from the tar file: tar xvf xorg_ifix2.tar cd xorg_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 ------------------------------------------------------------------ 6928b705ec941d257ee16baa0653e231d61b88b9 IV53331s0a.131220.epkg.Z 994dc8ed9e3d3a070d373ef1e26e64ca718d1b53 IV52181s0a.131220.epkg.Z 0a1efc1cc01a1f48e221083fce3f77ba23414f07 IV52184s0a.131220.epkg.Z | e53acec55bbf5e1fdc88673640e3e534b3280424 IV52978s0a.140128.epkg.Z af6e9486144e5e4d6301aa1580f8398d35550edd IV52185s0a.131220.epkg.Z 23031db6c7b896cda9ef7d11cf89b193813c8034 IV52186s0a.131220.epkg.Z | 69e86bc52f2461fb45fe8eee105db966fc6030ab IV53246s0a.140128.epkg.Z To verify the sums, use the text of this advisory as input to csum. For example: csum -h SHA1 -i xorg_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 security-alert@austin.ibm.com and describe the discrepancy. C. 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: | emgr -p -e fix_name # where fix_name is the name of the # fix package being previewed. To install a fix package: | emgr -e fix_name # where fix_name is the name of the # fix package being installed. V. WORKAROUNDS No workarounds 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/onvdq 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/87768 CVE-2013-4396: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-4396 *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. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.13 (AIX) iEYEARECAAYFAlLxOE0ACgkQ4fmd+Ci/qhK1RACdHjkL67FVNO4ioz0gFmSg1Dvp xogAn22uh8PUGRwOTr2IEDjNzcwNuN73 =e9g7 -----END PGP SIGNATURE-----