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IBM AIX Input Validation Flaw in iostat Command Lets Local Users Gain Root Privileges
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SecurityTracker Alert ID: 1020085 |
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SecurityTracker URL: http://securitytracker.com/id/1020085
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CVE Reference:
CVE-2008-2515
(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 in the iostat command. A local user can obtain root privileges on the target system.
A local user can invoke the 'usr/bin/iostat' command with a specially crafted environment variable value to execute arbitrary commands on the target system with 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 IZ20635
The vendor plans to issue the following APARs on June 20, 2008:
5.3.0 IZ22350
5.3.7 IZ22351
5.3.8 IZ21506
6.1.0 IZ22349
Efixes are available at:
http://aix.software.ibm.com/aix/efixes/security/iostat_fix.tar
ftp://aix.software.ibm.com/aix/efixes/security/iostat_fix.tar
The vendor's advisories are available at:
http://www.ibm.com/support/docview.wss?uid=isg1IZ20635
http://www.ibm.com/support/docview.wss?uid=isg1IZ22350
http://www.ibm.com/support/docview.wss?uid=isg1IZ22351
http://www.ibm.com/support/docview.wss?uid=isg1IZ21506
http://www.ibm.com/support/docview.wss?uid=isg1IZ22349
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Vendor URL: www.ibm.com/support/docview.wss?uid=isg1IZ20635 (Links to External Site)
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Cause:
Input validation 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 20:08:23 -0400
Subject: IBM AIX
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
IBM SECURITY ADVISORY
First Issued: Wed May 21 11:20:56 CDT 2008
===============================================================================
VULNERABILITY SUMMARY
VULNERABILITY: AIX iostat environment variable error
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? NO
===============================================================================
DETAILED INFORMATION
I. DESCRIPTION
The iostat command contains an environment variable handling
error. A local attacker may exploit this error to execute
arbitrary code with root privileges because the command is setuid
root.
The following files are vulnerable:
/usr/bin/iostat
II. PLATFORM VULNERABILITY ASSESSMENT
To determine if your system is vulnerable, execute the following
command:
lslpp -L bos.acct
The following fileset levels are vulnerable:
AIX Fileset Lower Level Upper Level
-----------------------------------------------------------
bos.acct 5.2.0.85 5.2.0.86
bos.acct 5.2.0.95 5.2.0.95
bos.acct 5.2.0.105 5.2.0.105
bos.acct 5.3.0.50 5.3.0.51
bos.acct 5.3.0.60 5.3.0.63
bos.acct 5.3.7.0 5.3.7.2
bos.acct 5.3.8.0 5.3.8.0
bos.acct 6.1.0.0 6.1.0.4
III. SOLUTIONS
A. APARS
IBM has assigned the following APARs to this problem:
AIX Level APAR number Availability
---------------------------------------------------
5.2.0 IZ20635 Now
5.3.0 IZ22350 6/20/2008
5.3.7 IZ22351 6/20/2008
5.3.8 IZ21506 6/20/2008
6.1.0 IZ22349 6/20/2008
Subscribe to the APARs here:
http://www.ibm.com/support/docview.wss?uid=isg1IZ20635
http://www.ibm.com/support/docview.wss?uid=isg1IZ22350
http://www.ibm.com/support/docview.wss?uid=isg1IZ22351
http://www.ibm.com/support/docview.wss?uid=isg1IZ21506
http://www.ibm.com/support/docview.wss?uid=isg1IZ22349
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/iostat_fix.tar
ftp://aix.software.ibm.com/aix/efixes/security/iostat_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 IZ20635_08.080514.epkg.Z
5.2.0 TL9 IZ20635_09.080514.epkg.Z
5.2.0 TL10 IZ20635_10.080514.epkg.Z
5.3.0 TL5 IZ22350_05.080514.epkg.Z
5.3.0 TL6 IZ22350_06.080514.epkg.Z
5.3.7 IZ22351_07.080514.epkg.Z
5.3.8 IZ21506_08.080514.epkg.Z
6.1.0 IZ22349_00.080514.epkg.Z
To extract the fixes from the tar file:
tar xvf iostat_fix.tar
cd iostat_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
-------------------------------------
50066 21 IZ20635_08.080514.epkg.Z
36104 21 IZ20635_09.080514.epkg.Z
62211 21 IZ20635_10.080514.epkg.Z
00806 47 IZ21506_08.080514.epkg.Z
58721 84 IZ22349_00.080514.epkg.Z
35311 43 IZ22350_05.080514.epkg.Z
51367 44 IZ22350_06.080514.epkg.Z
34354 47 IZ22351_07.080514.epkg.Z
cksum filename
-------------------------------------------
4243908138 21321 IZ20635_08.080514.epkg.Z
1977515682 21397 IZ20635_09.080514.epkg.Z
3364525726 21372 IZ20635_10.080514.epkg.Z
294568034 47109 IZ21506_08.080514.epkg.Z
1353517907 85731 IZ22349_00.080514.epkg.Z
784404659 43886 IZ22350_05.080514.epkg.Z
2620297401 44441 IZ22350_06.080514.epkg.Z
2078653751 47141 IZ22351_07.080514.epkg.Z
csum -h MD5 (md5sum) filename
-----------------------------------------------------------
a34baf6d059e2cb5d4bd42576b428e5a IZ20635_08.080514.epkg.Z
ca38fa1ded9ee91d10c03c0323bc0291 IZ20635_09.080514.epkg.Z
0a5d2df96aad21bc8fb89a8c2245121d IZ20635_10.080514.epkg.Z
aa2dc5cdd673a7d4d771ef2deda0f35b IZ21506_08.080514.epkg.Z
32d7c022d750ec0a02381936b4a40c6d IZ22349_00.080514.epkg.Z
9a1950fbdf6dce8a447213e1c27fb490 IZ22350_05.080514.epkg.Z
c935b8406819fff19b36eda177df6e94 IZ22350_06.080514.epkg.Z
6cce1445a7b479dece218c05a09ee0f0 IZ22351_07.080514.epkg.Z
csum -h SHA1 (sha1sum) filename
-------------------------------------------------------------------
88caf0c79cc56f95b44e7584ed7a62c522e96fa9 IZ20635_08.080514.epkg.Z
4011d191a10489a42e43648abc06b8ab7eca8154 IZ20635_09.080514.epkg.Z
5b1dcdc053162fbbf6d3503f835b19879fe419fe IZ20635_10.080514.epkg.Z
10b39d745f113bd9407045c1cd9184aef04c485c IZ21506_08.080514.epkg.Z
204fab6105119ec5776d8eab5bb417c380974505 IZ22349_00.080514.epkg.Z
d204a9a1f6a9095b17b84501a15350043753813c IZ22350_05.080514.epkg.Z
e39c50e85a81017b0622b0772e23c00e6424ca0c IZ22350_06.080514.epkg.Z
d8bd2529daecc0204de01f13bc88a8fe391fd018 IZ22351_07.080514.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/iostat
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)
iD8DBQFINEv8P9Qud62m600RArjDAKDQIkEINFGR4AGXG5iuwCkTVDCf6ACfRfKK
whMa1Avy8ZKtw/+7OPjyP60=
=O8jS
-----END PGP SIGNATURE-----
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