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AUSCERT External Security Bulletin Redistribution
ESB-2007.0569 -- [AIX]
AIX arp Buffer Overflow Vulnerability
27 July 2007
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AusCERT Security Bulletin Summary
---------------------------------
Product: arp(1)
Publisher: IBM
Operating System: AIX 5.2, 5.3
Impact: Root Compromise
Access: Existing Account
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IBM SECURITY ADVISORY
First Issued: Tue Jul 24 14:07:25 CDT 2007
===============================================================================
VULNERABILITY SUMMARY
VULNERABILITY: AIX arp Buffer Overflow Vulnerability
PLATFORMS: AIX 5.2, 5.3
SOLUTION: Apply the APAR, interim fix or workaround as described
below.
THREAT: An attacker may run arbitrary code with root privileges.
CERT VU Number: n/a
CVE Number: n/a
===============================================================================
DETAILED INFORMATION
I. OVERVIEW
The arp command displays and modifies the Internet-to-adapter address
translation tables used by the Address in Networks and communication
management. This program is installed as setuid with the
devices.common.IBM.atm.rte fileset.
NOTE: IBM has removed support for ATM functionality. This advisory is
only to notify users that their system is vulnerable and to provide a patch
for releases which are still delivering the fileset for legacy purposes.
II. DESCRIPTION
A buffer overflow vulnerability exits within the setuid program arp. This
advisory specifically addresses the atm subset of the arp command.
III. IMPACT
A successful exploitation of this buffer overflow will allow an
unprivileged user to execute arbitrary code with root privileges.
IV. PLATFORM VULNERABILITY ASSESSMENT
To determine if your system is vulnerable, run the following command:
# lslpp -l | grep devices.common.IBM.atm.rte
The following filesets are vulnerable:
AIX Level Lower Level Upper Level
-------------------------------------------------
5.2.0 5.2.0.51 5.2.0.95
5.3.0 5.3.0.40 5.3.0.60
V. SOLUTIONS
A. APARS
IBM provides the following fixes:
AIX Level APAR number Availability
--------------------------------------------------------------------
5.2.0 IZ00521 10/31/2007 (subject to change)
5.3.0 IZ00510 08/08/2007 (subject to change)
AIX Version 5 APARs can be downloaded from:
http://www.ibm.com/servers/eserver/support/unixservers/aixfixes.html
NOTE: Affected customers are urged to upgrade to the latest applicable
Technology Level and Service Pack.
B. INTERIM FIXES
Interim fixes are available. The interim fix can be downloaded via
ftp from:
ftp://aix.software.ibm.com/aix/efixes/security/atm_ifix.tar.Z
This is a compressed tarball containing this advisory, interim fix
packages and PGP signatures for each package. The interim fixes below
include prerequisite checking. This will enforce the correct mapping
between the fixes and AIX Technology Levels.
AIX Release & Technology Level Interim fix
---------------------------------------------------------------
5200-08 IZ00521_08.070622.epkg.Z
5200-09 IZ00521_09.070622.epkg.Z
5200-10 IZ00521_10.070622.epkg.Z
5300-04 IZ00510_04.070622.epkg.Z
5300-05 IZ00510_05.070622.epkg.Z
5300-06 IZ00510_06.070622.epkg.Z
IMPORTANT: If possible, it is recommended that a mksysb backup of the
system be created. Verify it is both bootable and readable before
proceeding.
These interim fixes have not been fully regression tested; thus, IBM
does not warrant the fully correct functionality of the interim fix.
Customers install the interim fix and operate the modified version of
AIX at their own risk.
Verify you have retrieved the fixes intact:
The interim fixes below are named by using the technology level
corresponding to the release that the fix applies to. The checksums
below were generated using the "sum" and "md5sum" commands and are as
follows:
Filename sum md5sum
----------------------------------------------------------------------
IZ00521_08.070622.epkg.Z 19355 11 888d9ff0634cd3833c7b84adda724ef2
IZ00521_09.070622.epkg.Z 22872 11 327f32bb81b4f7e03131ce2cc4fa25ce
IZ00521_10.070622.epkg.Z 26138 11 636584044285fda77d308194b7988b7c
IZ00510_04.070622.epkg.Z 15081 11 96e94ffc7ff68bacdc5d624cd6ddf7fe
IZ00510_05.070622.epkg.Z 57550 11 db98e7b8f3c212857f89e9252d74967d
IZ00510_06.070622.epkg.Z 46918 11 e490d017608db8e83c9a04d56f25b348
These sums should match exactly. The PGP signatures in the
compressed tarball and on this advisory can also be used to verify
the integrity of the various files they correspond to. If the sums
or signatures cannot be confirmed, double check the command results
and the download site address. If those are OK, contact IBM AIX
Security at security-alert@austin.ibm.com and describe the
discrepancy.
C. INTERIM FIX INSTALLATION
These packages use the new Interim Fix Management Solution to install
and manage interim fixes. More information can be found at:
http://www14.software.ibm.com/webapp/set2/sas/f/aix.efixmgmt/home.html
To preview an epkg interim fix installation execute the following
command:
# emgr -e ipkg_name -p # where ipkg_name is the name of the
# interim fix package being previewed.
To install an epkg interim fix package, execute the following command:
# emgr -e ipkg_name -X # where ipkg_name is the name of the
# interim fix package being installed.
The "X" flag will expand any filesystems if required.
VI. WORKAROUNDS
If the atm functionality is not needed on your platform, the best solution
is to remove the fileset listed above.
VII. OBTAINING FIXES
AIX Version 5 APARs can be downloaded from:
http://www.ibm.com/servers/eserver/support/unixservers/aixfixes.html
Security related Interim Fixes can be downloaded from:
ftp://aix.software.ibm.com/aix/efixes/security
VII. 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 send email to
security-alert@austin.ibm.com with a subject of "get key". The key
can also be downloaded from a PGP Public Key Server. The key id is
0x4265D862.
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.
VIII. ACKNOWLEDGMENTS
This vulnerability was discovered internal to IBM as part of its
commitment to secure the AIX operating system.
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