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AUSCERT External Security Bulletin Redistribution
ESB-2006.0701 -- [AIX]
Vulnerability in named8 may allow for arbitrary command execution
27 September 2006
AusCERT Security Bulletin Summary
Operating System: AIX 5.3
Impact: Root Compromise
Access: Existing Account
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IBM SECURITY ADVISORY
First Issued: Mon Sep 25 10:00 CDT 2006
VULNERABILITY: A vulnerability in named8 may allow a user in the
system group to execute arbitrary commands with root
PLATFORMS: AIX 5.2 and 5.3.
SOLUTION: Apply the APAR, interim fix or workaround as
THREAT: A local user in the system group may execute arbitrary
commands as root
CERT VU Number: n/a
CVE Number: n/a
Berkeley Internet Name Domain 8 (BIND 8) is a Domain Name System (DNS)
distribution from the Internet Systems Consortium (ISC) and it is included
with AIX 5.2 and 5.3. A security vulnerability was discovered in named8
which may allow a local user in the system group to execute arbitrary code
with root privileges.
named8 ships as part of the bos.net.tcp.server fileset. To determine if
this fileset is installed, execute the following command:
# lslpp -L bos.net.tcp.server
If the fileset is installed it will be listed along with its version
information, state, type and a description.
The following table shows the vulnerable versions of bos.net.tcp.server.
AIX Release Lower Upper
AIX 5.2 18.104.22.168 22.214.171.124
AIX 5.3 126.96.36.199 188.8.131.52
A local user in the system group may execute arbitrary commands with root
IBM provides the following fixes:
APAR number for AIX 5.2.0: IY76102 (available)
APAR number for AIX 5.3.0: IY76483 (available)
NOTE: Affected customers are urged to upgrade to the latest applicable
B. Interim Fix
Interim fixes are available. The interim fixes can be downloaded via ftp
This is a compressed tarball containing this advisory, interim fix packages
and cleartext PGP signatures for each 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 Technology 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:
The interim fixes below include prerequisite checking. This will enforce
the correct mapping between the fixes and AIX Technology Levels.
Filename sum md5
IY76102_07.060824.epkg.Z 22728 471 2784cfd2c0437216f3222dd11b971840
IY76102_08.060824.epkg.Z 16675 472 7bc52f632c7880c50c54690bbde0d497
IY76483_03.060824.epkg.Z 37314 463 7c9480925cc629303f555609059602eb
IY76483_04.060824.epkg.Z 09427 465 d6ed5bacfbc2b194ea832a08f6cd3da6
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 email@example.com
and describe the discrepancy.
The interim fixes include prerequisite checking. This will ensure the
correct mapping between the interim fixes and AIX Technology Levels. The
following table shows the prerequisite fileset levels required for the
fixes above. The fileset levels listed are for bos.net.tcp.server.
Interim Fileset Level Fileset Level
Fix (lower limit) (upper limit)
IY76102_07.060824.epkg.Z 184.108.40.206 220.127.116.11
IY76102_08.060824.epkg.Z 18.104.22.168 22.214.171.124
IY76483_03.060824.epkg.Z 126.96.36.199 188.8.131.52
IY76483_04.060824.epkg.Z 184.108.40.206 220.127.116.11
IMPORTANT: If possible, it is recommended that a mksysb backup of the
system is created. Verify it is both bootable, and readable before
Customers may contact IBM support if any issues arise with these interim
Interim Installation Instructions:
These packages use the new Interim Fix Management Solution to install and
manage interim fixes. More information can be found at:
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.
Remove the setuid root bit. Note that this will prevent named8 from
functioning normally for non-root users. This can be done by executing the
# chmod 550 /usr/sbin/named8
Verify the changes:
# ls -la /usr/sbin/named8
- - -r-xr-x--- 1 root system 649070 Nov 23 2004 /usr/sbin/named8
Restart named8 after applying this interim fix.
IV. Obtaining Fixes
AIX Version 5 APARs can be downloaded from:
Security related Interim Fixes can be downloaded from:
V. Contact Information
If you would like to receive AIX Security Advisories via email, please
Comments regarding the content of this announcement can be directed to:
To request the PGP public key that can be used to communicate securely
with the AIX Security Team send email to firstname.lastname@example.org
with a subject of "get key". The key can also be downloaded from a PGP
Public Key Server. The key id is 0x1B14F299.
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
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