Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2005.0989 -- [AIX]
Buffer overflow vulnerability in muxatmd
16 December 2005
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: muxatmd
Publisher: IBM
Operating System: AIX
Impact: Root Compromise
Access: Existing Account
- --------------------------BEGIN INCLUDED TEXT--------------------
- -----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
IBM SECURITY ADVISORY
First Issued: Thu Dec 15 09:00:44 CST 2005
==========================================================================
VULNERABILITY SUMMARY
VULNERABILITY: A buffer overflow vulnerability in muxatmd may allow
any local user to gain root privileges.
PLATFORMS: AIX 5.1, 5.2 and 5.3.
SOLUTION: Apply the APAR, interim fix or workaround as
described below.
THREAT: A local user may gain root privileges.
CERT VU Number: N/A
CVE Number: N/A
=========================================================================
DETAILED INFORMATION
I. Description
===============
A buffer overflow vulnerability in muxatmd may allow any local user to gain
root privileges.
The command affected by this issue ships as part of the
devices.common.IBM.atm.rte fileset. To determine if this fileset is
installed, execute the following command:
# lslpp -L devices.common.IBM.atm.rte
If the fileset is installed it will be listed along with its version
information, state, type and a description.
II. Impact
==========
A local user may gain root privileges.
III. Solutions
===============
A. Official Fix
IBM provides the following fixes:
APAR number for AIX 5.1.0: IY78221 (available approx. 01/30/06)
APAR number for AIX 5.2.0: IY78222 (available approx. 01/30/06)
APAR number for AIX 5.3.0: IY78223 (available approx. 01/30/06)
NOTE: Affected customers are urged to upgrade to 5.1.0, 5.2.0 or 5.3.0 at
the latest maintenance level.
B. Interim Fix
Interim fixes are available for AIX 5.1.0, 5.2.0 and 5.3.0. The ifixes can
be downloaded via ftp from:
ftp://aix.software.ibm.com/aix/efixes/security/libisode_ifix.tar.Z
libisode_ifix.tar.Z is a compressed tarball containing this advisory,
ifix packages and cleartext PGP signatures for each ifix package.
Verify you have retrieved the fixes intact:
- - --------------------------------------------
The interim fixes below are named by using the APAR corresponding to the
release that the fix applies to. The APAR is followed by an underscore and
the maintenance level for the particular AIX release that a fix applies to.
The checksums below were generated using the "sum" and "md5sum" commands
and are as follows:
Filename sum md5
========================================================================
IY78221_09.051109.epkg.Z 24042 1104 3b917ab19512e4613904a2222d0fac49
IY78222_05.051028.epkg.Z 17112 1081 dcd99ad0e710d04520a6229b55abb731
IY78222_06.051028.epkg.Z 03605 1082 e660aa65f81d9674b45c1de8f394684a
IY78222_07.051028.epkg.Z 21113 1082 8d62c78ff3918f01f2937005a8413f23
IY78223_01.051028.epkg.Z 37334 1108 f53f57ce4e33aa0fe9661af3a9ba2230
IY78223_02.051028.epkg.Z 17692 1110 861f1ed6e37590ca872da2b31b1960f0
IY78223_03.051028.epkg.Z 48165 1101 bd6f54ea569be551b9a34da445772b62
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.
IMPORTANT: If possible, it is recommended that a mksysb backup of the
system is created. Verify it is both bootable, and readable before
proceeding.
These ifixes have not been fully regression tested; thus, IBM does not
warrant the fully correct functioning of the ifix. Customers install the
ifix and operate the modified version of AIX at their own risk.
Interim Installation Instructions:
- - ----------------------------------
These packages use the new Interim Fix Management Solution to install
and manage ifixes. More information can be found at:
http://techsupport.services.ibm.com/server/aix.efixmgmt
To preview an epkg ifix installation execute the following command:
# emgr -e ipkg_name -p # where ipkg_name is the name of the
# ifix package being previewed.
To install an epkg ifix package, execute the following command:
# emgr -e ipkg_name -X # where ipkg_name is the name of the
# ifix package being installed.
The "X" flag will expand any filesystems if required.
C. Workaround
Remote the setuid file mode bit
- - -------------------------------
Removing the setuid root file mode bit will prevent non-root users from
exploiting the vulnerability. To remove the setuid bit, execute the
following command:
# chmod 555 /usr/sbin/muxatmd
Verify that the file mode bits have been updated:
# ls -la /usr/sbin/muxatmd
- - -r-xr-xr-x 1 root bin 62850 Apr 10 2005 /usr/sbin/muxatmd
muxatmd should be started by the root user to function normally.
IV. Obtaining Fixes
===================
AIX Version 5 APARs can be downloaded from:
http://www-1.ibm.com/servers/eserver/support/pseries/aixfixes.html
Security related Interim Fixes can be downloaded from:
ftp://aix.software.ibm.com/aix/efixes/security
V. Acknowledgments
==================
This vulnerability was reported by David Litchfield of NGS Software.
VI. Contact Information
========================
If you would like to receive AIX Security Advisories via email, please
visit:
https://techsupport.services.ibm.com/server/pseries.subscriptionSvcs
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 0x9391C1F2.
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.
- -----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.1 (GNU/Linux)
iD8DBQFDnxoIxwSSvpORwfIRAv78AJ4gIywN1ltzfDaCYWIflRd2qCiZ7QCfQfkX
jJxifzzQI2iG9s2K1/0SUFo=
=6NCz
- -----END PGP SIGNATURE-----
- --------------------------END INCLUDED TEXT--------------------
You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
http://www.auscert.org.au/render.html?cid=1980
If you believe that your computer system has been compromised or attacked in
any way, we encourage you to let us know by completing the secure National IT
Incident Reporting Form at:
http://www.auscert.org.au/render.html?it=3192
===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967
iQCVAwUBQ6JYcCh9+71yA2DNAQJp1gQAkqWG7dZqzJL59MwcVvxWV64949yStUZ/
jMx9pjjWOcsTr6v4uMhRvNMhERjDHt9FptiL3J5WxdKWffnlOKhAgYsMlIDq6Jlp
dVz7cnw8oLHoLj9Fh3WQN7RtDZxDXA9180ObWO6U/iE+RoXC/4FqPbrjo0C20rFa
bxdCTYocCdo=
=5iqv
-----END PGP SIGNATURE-----