30 june, 2009
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IBM SECURITY ADVISORY
First Issued: Wed Jun 17 10:50:48 CDT 2009
| Updated: Mon Jun 22 16:21:35 CDT 2009
| Updated VIOS levels in advisory
The most recent version of this document is available here:
http://aix.software.ibm.com/aix/efixes/security/libtt_advisory.asc
or
ftp://aix.software.ibm.com/aix/efixes/security/libtt_advisory.asc
VULNERABILITY SUMMARY
VULNERABILITY: AIX libtt.a rpc.ttdbserver remote buffer overflow
vulnerability
PLATFORMS: AIX 5.2, 5.3, 6.1
VIOS 1.3, 1.4, 1.5, 2.1
SOLUTION: Apply the fix or workaround as described below.
THREAT: A remote attacker may execute arbitrary code as root.
Reboot required? NO
Workarounds? YES
Protected by FPM? NO
Protected by SED? NO
DETAILED INFORMATION
I. DESCRIPTION
There is a buffer overflow vulnerability in the ToolTalk library
libtt.a. A remote attacker can exploit this vulnerability when
the rpc.ttdbserver is enabled in /etc/inetd.conf.
The successful exploitation of this vulnerability allows a remote
attacker to execute arbitrary code as the root user.
The following libraries and executables are vulnerable:
/usr/dt/lib/libtt.a
/usr/dt/bin/rpc.ttdbserver
II. PLATFORM VULNERABILITY ASSESSMENT
Note: To use the following commands on VIOS you must first
execute:
oem_setup_env
To determine if your system is vulnerable, execute the following
command:
lslpp -L X11.Dt.ToolTalk
The following fileset levels are vulnerable:
AIX Fileset Lower Level Upper Level
------------------------------------------------
X11.Dt.ToolTalk 5.2.0.105 5.2.0.105
X11.Dt.ToolTalk 5.3.0.0 5.3.0.0
X11.Dt.ToolTalk 5.3.0.60 5.3.0.61
X11.Dt.ToolTalk 5.3.7.0 5.3.7.0
X11.Dt.ToolTalk 5.3.8.0 5.3.8.0
X11.Dt.ToolTalk 5.3.9.0 5.3.9.0
X11.Dt.ToolTalk 5.3.9.0 5.3.9.0
X11.Dt.ToolTalk 6.1.0.0 6.1.0.0
X11.Dt.ToolTalk 6.1.1.0 6.1.1.0
X11.Dt.ToolTalk 6.1.2.0 6.1.2.0
X11.Dt.ToolTalk 6.1.3.0 6.1.3.0
III. SOLUTIONS
A. APARS
IBM has assigned the following APARs to this problem:
AIX Level APAR number Availability
---------------------------------------------------
5.2.0 IZ52842 07/22/09
5.3.0 IZ52843 interm fix only
5.3.7 IZ52844 11/11/09
5.3.8 IZ52845 11/11/09
5.3.9 IZ52846 11/11/09
5.3.10 IZ52847 11/11/09
6.1.0 IZ52848 09/23/09
6.1.1 IZ52849 09/23/09
6.1.2 IZ52850 09/23/09
6.1.3 IZ52851 09/23/09
Subscribe to the APARs here:
http://www.ibm.com/support/docview.wss?uid=isg1IZ52842
http://www.ibm.com/support/docview.wss?uid=isg1IZ52843
http://www.ibm.com/support/docview.wss?uid=isg1IZ52844
http://www.ibm.com/support/docview.wss?uid=isg1IZ52845
http://www.ibm.com/support/docview.wss?uid=isg1IZ52846
http://www.ibm.com/support/docview.wss?uid=isg1IZ52847
http://www.ibm.com/support/docview.wss?uid=isg1IZ52848
http://www.ibm.com/support/docview.wss?uid=isg1IZ52849
http://www.ibm.com/support/docview.wss?uid=isg1IZ52850
http://www.ibm.com/support/docview.wss?uid=isg1IZ52851
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 now available. The fixes can be downloaded from:
ftp://aix.software.ibm.com/aix/efixes/security/libtt_fix.tar
http://aix.software.ibm.com/aix/efixes/security/libtt_fix.tar
The links above are to a tar file containing this signed
advisory, fix packages, and PGP signatures for each package.
AIX Level VIOS Level Interim Fix (*.Z)
-------------------------------------------------------------------
5.2.0 IZ52842_10.090617.epkg.Z
5.3.0 TL5 1.3 IZ52843_05.090617.epkg.Z
5.3.0 TL6 1.4 IZ52843_06.090617.epkg.Z
5.3.7 1.5.0, 1.5.1 IZ52844_07.090617.epkg.Z
5.3.8 1.5.2 IZ52845_08.090617.epkg.Z
5.3.9 IZ52846_09.090617.epkg.Z
5.3.10 IZ52847_10.090617.epkg.Z
6.1.0 IZ52848_00.090617.epkg.Z
6.1.1 IZ52849_01.090617.epkg.Z
6.1.2 2.1.0 IZ52850_02.090617.epkg.Z
6.1.3 2.1.1 IZ52851_03.090617.epkg.Z
To extract the fixes from the tar file:
tar xvf libtt_fix.tar
cd libtt_fix
Verify you have retrieved the fixes intact:
The checksums below were generated using the "csum -h SHA1"
(sha1sum) commands and are as follows:
csum -h SHA1 (sha1sum) filename
------------------------------------------------------------------
32761971bcdd9e69b2bf6b2010d074037b437010 IZ52842_10.090617.epkg.Z
5008216f62634db3c009516fa68f9ed1753748fb IZ52843_05.090617.epkg.Z
45c9a42779a2179da13d34d13891290e1935d434 IZ52843_06.090617.epkg.Z
e2fa06c867d592a9b0405fd32285abd899fb996d IZ52844_07.090617.epkg.Z
74290e4fd31c4e934d27bcf369022b951ae8439d IZ52845_08.090617.epkg.Z
8b2daa71185e32491421b305772602de51e6d951 IZ52846_09.090617.epkg.Z
eae9a835feba6c54c22d33e580fd4b31561758f9 IZ52847_10.090617.epkg.Z
2325c1095ac18e0dcd233c4cd0cec16b11f38ff2 IZ52848_00.090617.epkg.Z
d0809e09e92b7cfe49938c8ce22ba71876147b26 IZ52849_01.090617.epkg.Z
40bd242b97fab9c9d9b54eead089c284849aecdb IZ52850_02.090617.epkg.Z
2c041318ba437138d9011b35f38a2605c2a56bf9 IZ52851_03.090617.epkg.Z
To verify the sums, use the text of this advisory as input to
csum or sha1sum. For example:
csum -h SHA1 -i 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 and describe the
discrepancy at the following address:
security-alert@austin.ibm.com
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. WORKAROUND
Remove the entry for rpc.ttdbserver from /etc/inetd.conf and
refresh inetd so that inetd will no longer run the program. This
can be done by running the following command:
chsubserver -r inetd -C /etc/inetd.conf -d -v 'ttdbserver' -p 'tcp'
Any remaining instances of rpc.ttdbserver should be killed with
the following command:
ps -efl|grep [r]pc.ttdbserver|awk '{x = "kill " $4}{system(x)}'
NOTE: Removing rpc.ttdbserver from /etc/inetd.conf will disable
some functionality for all users.
V. OBTAINING FIXES
AIX security fixes can be downloaded from:
http://aix.software.ibm.com/aix/efixes/security
or
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://www.ibm.com/systems/support
and click on the "My notifications" link.
To view previously issued advisories, 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 obtain the PGP public key that can be used to communicate
securely with the AIX Security Team you can either:
A. Download the key from our web page:
http://www.ibm.com/systems/resources/systems_p_os_aix_security_pgpkey.txt
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
This vulnerability was reported by Adriano Lima
adriano@risescurity.org and Ramon de Carvalho Valle
ramon@risesecurity.org.
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