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(IBM Issues Fix for AIX) X Server Bugs in XFree86, Xinput, TOG-CUP, MIT-SHM, and EVI Extensions Let Local Users Gain Root Privileges
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SecurityTracker Alert ID: 1019521 |
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SecurityTracker URL: http://securitytracker.com/id/1019521
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CVE Reference:
CVE-2007-6427, CVE-2007-6428, CVE-2007-6429, CVE-2008-0006
(Links to External Site)
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Date: Feb 28 2008
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Impact:
Disclosure of system information, Disclosure of user information, Root access via local system
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Fix Available: Yes Vendor Confirmed: Yes
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Version(s): 7.3
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Description:
Several vulnerabilities were reported in X. A local user can obtain root privileges on the target system. A local user can determine whether certain files or directories exist on the target system.
A local user can exploit any of several memory corruption errors in the X server to execute arbitrary code with the privileges of the target X server (typically root level privileges).
A local user can supply a specially PassMessage request to cause an out-of-bounds array index error and trigger a pointer dereference in the XFree86 Misc extension [CVE-2007-5760].
A local user can supply a certain type of command ('X :1 -sp <file>') specifying an arbitrary file or directory to identify whether the specified file exists in access-restricted directories based on the error message returned by the system [CVE-2007-5958].
A local user can trigger a heap corruption error in the Xinput extension [CVE-2007-6427].
A local user can read arbitrary memory contents by exploiting the ProcGetReservedColormapEntries() function in the TOG-CUP extension [CVE-2007-6428].
A local user can supply a specially crafted request to trigger an integer overflow in the pixmap creation process in the MIT-SHM and EVI extensions [CVE-2007-6429].
A local user can supply a specially crafted PCF font to trigger a buffer overflow [CVE-2008-0006].
regenrecht reported CVE-2007-5760, CVE-2007-6427, CVE-2007-6428, and CVE-2007-6429 via iDefense. Takuya Shiozaki of CodeBlog reported CVE-2008-0006. An anonymous researcher reported CVE-2007-5859.
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Impact:
A local user can obtain root privileges on the target system.
A local user can determine whether files or directories exist on the target system.
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Solution:
IBM has issued a fix for IBM AIX for CVE-2007-6427, CVE-2007-6428, CVE-2007-6429, and CVE-2008-0006. AIX is not affected by CVE-2007-5760 and CVE-2007-5958.
IBM plans to issue the following APARs:
For 5.2.0: IZ13652
For 5.3.0: IZ13653
For 5.3.7: IZ13654
For 6.1.0: IZ13655
An interim fix is also available at:
ftp://aix.software.ibm.com/aix/efixes/security/X_ifix.tar
The IBM advisories are available at:
http://www.ibm.com/support/docview.wss?uid=isg1IZ13652
http://www.ibm.com/support/docview.wss?uid=isg1IZ13653
http://www.ibm.com/support/docview.wss?uid=isg1IZ13654
http://www.ibm.com/support/docview.wss?uid=isg1IZ13655
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Vendor URL: lists.freedesktop.org/archives/xorg/2008-January/031918.html (Links to External Site)
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Cause:
Access control error, Boundary error
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Underlying OS:
UNIX (AIX)
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Message History:
This archive entry is a follow-up to the message listed below.
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Source Message Contents
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Date: Thu, 28 Feb 2008 07:49:39 -0500
Subject: IBM AIX
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
IBM SECURITY ADVISORY
First Issued: Wed Feb 27 10:57:32 CST 2008
===============================================================================
VULNERABILITY SUMMARY
VULNERABILITY: AIX X server multiple vulnerabilities
PLATFORMS: AIX 5.2, 5.3, 6.1
SOLUTION: Apply the fix or workaround as described below.
THREAT: An attacker may execute arbitrary code with root
privileges.
CVE Numbers: CVE-2007-6427, CVE-2007-6428, CVE-2007-6429, CVE-2008-0006
===============================================================================
DETAILED INFORMATION
I. DESCRIPTION
There are multiple vulnerabilities in the AIX X server. Please
refer to the following links for more information:
http://lists.freedesktop.org/archives/xorg/2008-January/031918.html
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-6427
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-6428
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-6429
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-0006
Please note that AIX does not have the vulnerabilities described
in CVE-2007-5760 and CVE-2007-5958.
The successful exploitation of these vulnerabilities allows a
non-privileged user to execute code with root privileges. If the
X server is configured to allow remote connections, remote attacks
are possible.
The following commands are vulnerable:
/usr/bin/X11/X
II. PLATFORM VULNERABILITY ASSESSMENT
To determine if your system is vulnerable, execute the following
command:
lslpp -L X11.base.rte
The following fileset levels are vulnerable:
AIX Fileset Lower Level Upper Level
------------------------------------------------
X11.base.rte 5.2.0.0 5.2.0.106
X11.base.rte 5.3.0.0 5.3.0.62
X11.base.rte 5.3.7.0 5.3.7.1
X11.base.rte 6.1.0.0 6.1.0.2
III. SOLUTIONS
A. APARS
IBM has assigned the following APARs to this problem:
AIX Level APAR number Availability
---------------------------------------------------
5.2.0 IZ13652 05/07/08
5.3.0 IZ13653 03/12/08
5.3.7 IZ13654 03/12/08
6.1.0 IZ13655 04/09/08
Subscribe to the APARs here:
http://www.ibm.com/support/docview.wss?uid=isg1IZ13652
http://www.ibm.com/support/docview.wss?uid=isg1IZ13653
http://www.ibm.com/support/docview.wss?uid=isg1IZ13654
http://www.ibm.com/support/docview.wss?uid=isg1IZ13655
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_ifix.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
-------------------------------------------------------------------
5.2.0 TL8 IZ13652_08.080214.epkg.Z
5.2.0 TL9 IZ13652_09.080214.epkg.Z
5.2.0 TL10 IZ13652_10.080214.epkg.Z
5.3.0 TL5 IZ13653_05.080214.epkg.Z
5.3.0 TL6 IZ13653_06.080214.epkg.Z
5.3.7 IZ13654_07.080214.epkg.Z
6.1.0 IZ13655_00.080214.epkg.Z
To extract the fixes from the tar file:
tar xvf X_ifix.tar
cd X_ifix
Verify you have retrieved the fixes intact:
The checksums below were generated using the "sum", "cksum",
"csum -h MD5" (md5sum), and "csum -h SHA1" (sha1sum) commands
and are as follows:
sum filename
------------------------------------
29454 1764 IZ13652_08.080214.epkg.Z
54867 1763 IZ13652_09.080214.epkg.Z
22131 1765 IZ13652_10.080214.epkg.Z
46384 1820 IZ13653_05.080214.epkg.Z
48056 1819 IZ13653_06.080214.epkg.Z
56839 1820 IZ13654_07.080214.epkg.Z
22144 2214 IZ13655_00.080214.epkg.Z
cksum filename
------------------------------------------
84291091 1805551 IZ13652_08.080214.epkg.Z
1431371517 1805065 IZ13652_09.080214.epkg.Z
2007335003 1806825 IZ13652_10.080214.epkg.Z
3474601132 1863121 IZ13653_05.080214.epkg.Z
313288505 1862398 IZ13653_06.080214.epkg.Z
1719442596 1862767 IZ13654_07.080214.epkg.Z
2099107711 2267095 IZ13655_00.080214.epkg.Z
csum -h MD5 (md5sum) filename
----------------------------------------------------------
b4c94b67e0a89ecbf98de04ff3712505 IZ13652_08.080214.epkg.Z
67a53991b8a550ea02395538710c359e IZ13652_09.080214.epkg.Z
1100c184ecb2bdc769d8740f719bb991 IZ13652_10.080214.epkg.Z
435a4283d8a4fcc0ce73c3fb1fe41890 IZ13653_05.080214.epkg.Z
8e7489e24303e88f37c6d61ee37da51d IZ13653_06.080214.epkg.Z
f2e0627a31898c914215ded8caa0205b IZ13654_07.080214.epkg.Z
e30e32047ebdf153831a0187ad7cdea9 IZ13655_00.080214.epkg.Z
csum -h SHA1 (sha1sum) filename
------------------------------------------------------------------
6e2477ebe0717d08084975388b760f04718f7a65 IZ13652_08.080214.epkg.Z
5829afefa835ac36217492ec962171d03844347a IZ13652_09.080214.epkg.Z
6588e81f74ebe6b39cc10d9e5ab588462b3f1abf IZ13652_10.080214.epkg.Z
19360313640f5438a46743360a53d27e485cb5d7 IZ13653_05.080214.epkg.Z
50d788358b316cff38705970a9a783fe846b8751 IZ13653_06.080214.epkg.Z
c8392c5558059157607949180838eaeb4be763d0 IZ13654_07.080214.epkg.Z
d6ba687715bb0c3a6e438b63d0115836d4e35b50 IZ13655_00.080214.epkg.Z
To verify the sums, use the text of this advisory as input to
csum, md5sum, or sha1sum. For example:
csum -h SHA1 -i Advisory.asc
md5sum -c Advisory.asc
sha1sum -c Advisory.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. 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.
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.
IMPORTANT: The ifix requires the user to restart the X-Server.
The X-Server can be restarted in CDE by exiting CDE and
selecting restart.
IV. 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
V. OBTAINING FIXES
AIX security fixes can be downloaded from:
ftp://aix.software.ibm.com/aix/efixes/security
AIX fixes can be downloaded from:
http://www.ibm.com/eserver/support/fixes/fixcentral/main/pseries/aix
NOTE: Affected customers are urged to upgrade to the latest
applicable Technology Level and Service Pack.
VI. CONTACT INFORMATION
If you would like to receive AIX Security Advisories via email,
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 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:
0xA6A36CCC
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. ACKNOWLEDGMENTS
Vulnerabilities described by CVE-2007-6427, CVE-2007-6428 and
CVE-2007-6429 were reported to iDefense Labs by regenrecht.
CVE-2008-0006 was reported to CERT/CC by Takuya Shiozaki
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.7 (AIX)
iD8DBQFHxZx/8lficKajbMwRAgFdAJ4i5P3YY1mWHmbbLgI9mtKfU/oaZQCfQ0AC
XC/4CZlf4y2Ek7gqT/7XdU0=
=RdPN
-----END PGP SIGNATURE-----
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