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===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2008.0221 -- [AIX]
AIX libc inet_network buffer overflow
25 March 2008
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: libc
Publisher: IBM
Operating System: AIX 6.1
AIX 5.3
AIX 5.2
Impact: Execute Arbitrary Code/Commands
Access: Remote/Unauthenticated
CVE Names: CVE-2008-0122
Ref: ESB-2008.0102
Revision History: March 25 2008: 5.2 TL8 fix correction,
5.3 TL6 SP6 and 5.3 TL7 SP3 now
supported
February 29 2008: Initial Release
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===============================================================================
VULNERABILITY SUMMARY
VULNERABILITY: AIX libc inet_network buffer overflow
PLATFORMS: AIX 5.2, 5.3, 6.1
SOLUTION: Apply the fix as described below.
THREAT: A remote attacker may execute arbitrary code.
CVE Number: CVE-2008-0122
===============================================================================
DETAILED INFORMATION
I. DESCRIPTION
There is an off-by-one error in the AIX libc implementation of the
inet_network function. Programs which call this function will be
vulnerable. Please refer to the following links for more
information:
http://security.freebsd.org/advisories/FreeBSD-SA-08:02.libc.asc
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-0122
The successful exploitation of this vulnerability allows a
remote user to execute arbitrary code.
The following library is vulnerable:
/usr/ccs/lib/libc.a
II. PLATFORM VULNERABILITY ASSESSMENT
To determine if your system is vulnerable, execute the following
command:
lslpp -L bos.rte.libc
The following fileset levels are vulnerable:
AIX Fileset Lower Level Upper Level
------------------------------------------------
bos.rte.libc 5.2.0.0 5.2.0.109
bos.rte.libc 5.3.0.0 5.3.0.66
bos.rte.libc 5.3.7.0 5.3.7.3
bos.rte.libc 6.1.0.0 6.1.0.3
NOTE: AIX 5.3 TL6 SP6 and AIX 5.3 TL7 SP3 will not contain this
fix when they are released. An updated ifix will be released when
the service packs are released.
| The fix for 5.2 TL8 has been updated to include the fix for
| IY94368.
| The 5.3 TL6 and 5.3 TL7 fixes now support 5.3 TL6 SP6 and 5.3 TL7
| SP3.
III. SOLUTIONS
A. APARS
IBM has assigned the following APARs to this problem:
AIX Level APAR number Availability
---------------------------------------------------
5.2.0 IZ15564 05/07/08
5.3.0 IZ15567 05/28/08
5.3.7 IZ15566 05/28/08
6.1.0 IZ15565 04/09/08
Subscribe to the APARs here:
http://www.ibm.com/support/docview.wss?uid=isg1IZ15564
http://www.ibm.com/support/docview.wss?uid=isg1IZ15567
http://www.ibm.com/support/docview.wss?uid=isg1IZ15566
http://www.ibm.com/support/docview.wss?uid=isg1IZ15565
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/libc_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 IZ15564_08.080305.epkg.Z
5.2.0 TL9 IZ15564_09.080219.epkg.Z
5.2.0 TL10 IZ15564_10.080219.epkg.Z
5.3.0 TL5 IZ15567_05.080219.epkg.Z
| 5.3.0 TL6 IZ15567_06.080320.epkg.Z
| 5.3.7 IZ15566_07.080320.epkg.Z
6.1.0 IZ15565_00.080219.epkg.Z
To extract the fixes from the tar file:
tar xvf libc_ifix.tar
cd libc_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
------------------------------------
| 06430 3150 IZ15564_08.080305.epkg.Z
19549 3172 IZ15564_09.080219.epkg.Z
52071 3186 IZ15564_10.080219.epkg.Z
53605 4731 IZ15565_00.080219.epkg.Z
| 15822 4049 IZ15566_07.080320.epkg.Z
11422 3565 IZ15567_05.080219.epkg.Z
| 65020 4007 IZ15567_06.080320.epkg.Z
cksum filename
------------------------------------------
| 3238578918 3225462 IZ15564_08.080305.epkg.Z
1510474728 3247126 IZ15564_09.080219.epkg.Z
168637892 3261516 IZ15564_10.080219.epkg.Z
683046070 4843871 IZ15565_00.080219.epkg.Z
| 3336076587 4145884 IZ15566_07.080320.epkg.Z
1361113499 3649666 IZ15567_05.080219.epkg.Z
| 3636846589 4102251 IZ15567_06.080320.epkg.Z
csum -h MD5 (md5sum) filename
----------------------------------------------------------
| a9438d69a9f8861f0d66653a218b141a IZ15564_08.080305.epkg.Z
0dce26937a5c37af54f7530beb7e4c09 IZ15564_09.080219.epkg.Z
4c315531586da4fce4ff752ee067408f IZ15564_10.080219.epkg.Z
22c2ad002375f05f59c25f68e36a27a3 IZ15565_00.080219.epkg.Z
| f90a066da2277a63b22a43cdcfa7f2a2 IZ15566_07.080320.epkg.Z
985dc8bbcb71f09b8874944f302e4498 IZ15567_05.080219.epkg.Z
| 53a5d4c4490f2135182b6a4f9c4921c6 IZ15567_06.080320.epkg.Z
csum -h SHA1 (sha1sum) filename
------------------------------------------------------------------
| 7daaa9a640ec9f0172232a6770856fff84979dc9 IZ15564_08.080305.epkg.Z
18ac4146cd3eadeb3c0ecbee11d720efc29a4076 IZ15564_09.080219.epkg.Z
b852a9ae018fe380f07048b20510f794b15b1610 IZ15564_10.080219.epkg.Z
79d367b661490c226a08acb7e0dc87f223addbc5 IZ15565_00.080219.epkg.Z
| 7e821f33a3fa002385617db4d29767160f89a25d IZ15566_07.080320.epkg.Z
d2e334e464c4b49fe731cc586dd786a3a79dd33a IZ15567_05.080219.epkg.Z
| fad9172deba5290d43d90d2226e8c6a206f25e1a IZ15567_06.080320.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.
IV. WORKAROUNDS
There are no workarounds.
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
Bjoern A. Zeeb and Nate Eldredge reported this vulnerability.
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