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IBM AIX Buffer Overflow in errpt Command May Let Local Users Gain Elevated Privileges
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SecurityTracker Alert ID: 1020084 |
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SecurityTracker URL: http://securitytracker.com/id/1020084
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CVE Reference:
CVE-2008-2514
(Links to External Site)
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Updated: Jun 3 2008
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Original Entry Date: May 22 2008
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Impact:
Execution of arbitrary code via local system, Root access via local system
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Fix Available: Yes Vendor Confirmed: Yes
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Version(s): 5.2, 5.3, 6.1
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Description:
A vulnerability was reported in AIX. A local user can obtain root privileges on the target system.
A local user can trigger a buffer overflow to execute arbitrary code on the target system with root privileges.
The vulnerability resides in '/usr/bin/errpt', which is configured with set user id (setuid) root privileges.
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Impact:
A local user can obtain root privileges on the target system.
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Solution:
The vendor has issued the following APAR:
5.2.0 IZ19905
The vendor plans to issue the following APARs on June 20, 2008:
5.3.0 IZ22346
5.3.7 IZ22347
5.3.8 IZ21494
6.1.0 IZ22348
Efixes are available at:
http://aix.software.ibm.com/aix/efixes/security/errpt_fix.tar
ftp://aix.software.ibm.com/aix/efixes/security/errpt_fix.tar
The vendor's advisories are available at:
http://www.ibm.com/support/docview.wss?uid=isg1IZ19905
http://www.ibm.com/support/docview.wss?uid=isg1IZ22346
http://www.ibm.com/support/docview.wss?uid=isg1IZ22347
http://www.ibm.com/support/docview.wss?uid=isg1IZ21494
http://www.ibm.com/support/docview.wss?uid=isg1IZ22348
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Vendor URL: www.ibm.com/support/docview.wss?uid=isg1IZ19905 (Links to External Site)
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Cause:
Boundary error
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Underlying OS:
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Message History:
None.
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Source Message Contents
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Date: Wed, 21 May 2008 20:01:07 -0400
Subject: IBM AIX
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
IBM SECURITY ADVISORY
First Issued: Wed May 21 11:18:21 CDT 2008
===============================================================================
VULNERABILITY SUMMARY
VULNERABILITY: AIX errpt buffer overflow
PLATFORMS: AIX 5.2, 5.3, 6.1
SOLUTION: Apply the fix or workaround as described below.
THREAT: A local attacker may execute arbitrary code.
CVE Number: n/a
Reboot required? NO
Workarounds? YES
Protected by FPM? YES (high, medium, or low)
Protected by SED? YES
===============================================================================
DETAILED INFORMATION
I. DESCRIPTION
The errpt command contains a buffer which can overflow. A local
attacker may exploit this overflow to execute arbitrary code with
root privileges because the command is setuid root.
The following files are vulnerable:
/usr/bin/errpt
II. PLATFORM VULNERABILITY ASSESSMENT
To determine if your system is vulnerable, execute the following
command:
lslpp -L bos.sysmgt.serv_aid
The following fileset levels are vulnerable:
AIX Fileset Lower Level Upper Level
-----------------------------------------------------------
bos.sysmgt.serv_aid 5.2.0.85 5.2.0.86
bos.sysmgt.serv_aid 5.2.0.95 5.2.0.96
bos.sysmgt.serv_aid 5.2.0.105 5.2.0.108
bos.sysmgt.serv_aid 5.3.0.50 5.3.0.53
bos.sysmgt.serv_aid 5.3.0.60 5.3.0.65
bos.sysmgt.serv_aid 5.3.7.0 5.3.7.2
bos.sysmgt.serv_aid 5.3.8.0 5.3.8.0
bos.sysmgt.serv_aid 6.1.0.0 6.1.0.3
III. SOLUTIONS
A. APARS
IBM has assigned the following APARs to this problem:
AIX Level APAR number Availability
---------------------------------------------------
5.2.0 IZ19905 Now
5.3.0 IZ22346 6/20/2008
5.3.7 IZ22347 6/20/2008
5.3.8 IZ21494 6/20/2008
6.1.0 IZ22348 6/20/2008
Subscribe to the APARs here:
http://www.ibm.com/support/docview.wss?uid=isg1IZ19905
http://www.ibm.com/support/docview.wss?uid=isg1IZ22346
http://www.ibm.com/support/docview.wss?uid=isg1IZ22347
http://www.ibm.com/support/docview.wss?uid=isg1IZ21494
http://www.ibm.com/support/docview.wss?uid=isg1IZ22348
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 from:
http://aix.software.ibm.com/aix/efixes/security/errpt_fix.tar
ftp://aix.software.ibm.com/aix/efixes/security/errpt_fix.tar
The links above are 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 Fix (*.U) and Interim Fix (*.Z)
-------------------------------------------------------------------
5.2.0 TL8 IZ19905_08.080514.epkg.Z
5.2.0 TL9 IZ19905_09.080514.epkg.Z
5.2.0 TL10 IZ19905_10.080514.epkg.Z
5.3.0 TL5 IZ22346_05.080514.epkg.Z
5.3.0 TL6 IZ22346_06.080514.epkg.Z
5.3.7 IZ22347_07.080514.epkg.Z
5.3.8 IZ21494_08.080514.epkg.Z
6.1.0 IZ22348_00.080514.epkg.Z
To extract the fixes from the tar file:
tar xvf errpt_fix.tar
cd errpt_fix
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
-------------------------------------
20662 70 IZ19905_08.080514.epkg.Z
49871 70 IZ19905_09.080514.epkg.Z
65249 70 IZ19905_10.080514.epkg.Z
20402 77 IZ21494_08.080514.epkg.Z
38539 71 IZ22346_05.080514.epkg.Z
58208 71 IZ22346_06.080514.epkg.Z
36061 71 IZ22347_07.080514.epkg.Z
42508 80 IZ22348_00.080514.epkg.Z
cksum filename
-------------------------------------------
3882518034 70837 IZ19905_08.080514.epkg.Z
2140254126 70873 IZ19905_09.080514.epkg.Z
2999649633 70855 IZ19905_10.080514.epkg.Z
136921164 77935 IZ21494_08.080514.epkg.Z
4041292547 71831 IZ22346_05.080514.epkg.Z
2261779182 72003 IZ22346_06.080514.epkg.Z
2782459181 71977 IZ22347_07.080514.epkg.Z
136691478 81601 IZ22348_00.080514.epkg.Z
csum -h MD5 (md5sum) filename
-----------------------------------------------------------
ddb6f834e7ac261eec0d050692f9a4f9 IZ19905_08.080514.epkg.Z
7d731e832f34a85dedbaab6944259ff7 IZ19905_09.080514.epkg.Z
b3c95dec7d77e4f6ece81a460b9081c0 IZ19905_10.080514.epkg.Z
9097e598765864e037316d73af642213 IZ21494_08.080514.epkg.Z
6a47bcff98bfc9967a90506d7a84c751 IZ22346_05.080514.epkg.Z
14530192116bcff8244d159dcd9486aa IZ22346_06.080514.epkg.Z
cfb851756c0a0321030a702bd2438ae5 IZ22347_07.080514.epkg.Z
2f3242a35b5ee025981fb323d03fd7f2 IZ22348_00.080514.epkg.Z
csum -h SHA1 (sha1sum) filename
-------------------------------------------------------------------
ed9af41242cab4940e16eaa1f93edcab296d14b0 IZ19905_08.080514.epkg.Z
fbdb43efe35323bfc22285ff3d8345fa29825e38 IZ19905_09.080514.epkg.Z
0346358cd53a06c04bae68e7176db59bdeb89650 IZ19905_10.080514.epkg.Z
a2f4c58a14f85ac29a4afc39e722b6174dbc25ac IZ21494_08.080514.epkg.Z
20cdd46d425cc37939eb8ceb317db67d3b0aaa27 IZ22346_05.080514.epkg.Z
22735d834ffdd299ddbd727611519483ca6ea810 IZ22346_06.080514.epkg.Z
a9b5d036d93a2a4ec32856485ef4240b3562f3e4 IZ22347_07.080514.epkg.Z
a8a174860f1fc411f641ba6d1fea575e118e2cbb IZ22348_00.080514.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. 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.
IV. WORKAROUNDS
There are two workarounds available.
A. OPTION 1
Change the permissions of these commands to remove the setuid
bit using the following commands:
chmod 500 /usr/bin/errpt
NOTE: chmod will disable functionality of these commands for
all users except root.
B. OPTION 2 (AIX 6.1, AIX 5.3 TL6 and TL7)
Use the File Permissions Manager (fpm) command to manage
setuid and setgid programs.
fpm documentation can be found in the AIX 6 Security Redbook
at:
http://www.redbooks.ibm.com/abstracts/sg247430.html
An fpm level of high, medium, or low will remove the setuid
bit from the affected commands. For example:
fpm -l high -p # to preview changes
fpm -l high # to execute changes
NOTE: Please review the documentation before execution. fpm
will disable functionality of multiple commands for all users
except root.
V. OBTAINING FIXES
AIX security fixes can be downloaded from:
http://aix.software.ibm.com/aix/efixes/security
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:
0xADA6EB4D
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
IBM discovered and fixed this vulnerability as part of its
commitment to secure the AIX operating system.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.7 (AIX)
iD8DBQFINEtqP9Qud62m600RAl0+AKCkNgNhJaNf4JIZORXnzzl0pBxsDwCdGuOP
EOIBkMKFRGLHmLt5aOEIwsU=
=Wm1z
-----END PGP SIGNATURE-----
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