SECURITY (Doc Number=3353): Vulnerability in AIX X-Server CVE-2013-4396

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 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1  IBM SECURITY ADVISORY  First Issued: Tues Jan 21 14:01:02 CST 2011  The most recent version of this document is available here:  http://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   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       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  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         02/21/2014      SP9     key_w_apar         6.1.8           IV52184         02/21/2014      SP4     key_w_apar         7.1.1           IV52185         02/21/2014      SP9     key_w_apar         7.1.2           IV52186         02/21/2014      SP4     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         7.1.1             IV52185s0a.131220.epkg.Z     key_w_fix         7.1.2             IV52186s0a.131220.epkg.Z     key_w_fix 			         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		 		af6e9486144e5e4d6301aa1580f8398d35550edd  IV52185s0a.131220.epkg.Z 		23031db6c7b896cda9ef7d11cf89b193813c8034  IV52186s0a.131220.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:          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.  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)  iEYEARECAAYFAlLe0gIACgkQ4fmd+Ci/qhLaPQCdGZrQeZo+O7E12KZ/2awPjpAT zMYAn1gtpuxl767FuXOvSwdLKh0a64fG =idCo -----END PGP SIGNATURE-----