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CentOS ProjectXORG_ADVISORY2.ASC

HistoryJan 21, 2014 - 2:01 p.m.

Vulnerability in AIX X-Server,Vulnerability in VIOS X-Server

2014-01-2114:01:02

CentOS Project

aix.software.ibm.com

6.5 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

SINGLE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:L/Au:S/C:P/I:P/A:P

0.029 Low

EPSS

Percentile

89.7%

JSON

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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
    -----------------------------------------------------------------

 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
    [email protected] 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:

    [email protected]

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:

        [email protected]

    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.

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