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AUSCERT External Security Bulletin Redistribution
ESB-2006.0696 -- [AIX]
Vulnerability in mkvg may allow for arbitrary command execution
26 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: An incomplete path vulnerability in the mkvg command
may allow a local user in the system group to execute
arbitrary commands with root privileges.
PLATFORMS: AIX 5.2 and 5.3.
SOLUTION: Apply the APAR, interim fix or workaround as described
THREAT: A local user may execute arbitrary code.
CERT VU Number: n/a
CVE Number: n/a
A vulnerability was discovered in the mkvg command which may allow a local
user in the system group to execute arbitrary code with root privileges.
extendvg and mkvg are hardlinks to the same executable. These commands are
used to manage volume groups.
The mkvg command ships as part of the bos.rte.lvm fileset.
To determine if a fileset is installed, execute the following command:
# lslpp -L bos.rte.lvm
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.rte.lvm.
AIX Release Lower Upper
AIX 5.2 184.108.40.206 220.127.116.11
AIX 5.3 18.104.22.168 22.214.171.124
A local user in the system group may execute arbitrary code with root
IBM provides the following fixes:
APAR number for AIX 5.2.0: IY88722 (available)
APAR number for AIX 5.3.0: IY88699 (available approx. 10/04/06)
NOTE: Affected customers are urged to upgrade to the latest applicable
B. Interim Fix
Interim fixes are currently available. The interim fixes can be downloaded
via ftp from:
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.
Filename sum md5
IY88722_07.060908.epkg.Z 05480 19 2ad7419e7f75430396122a01e26efdf5
IY88722_08.060908.epkg.Z 02692 19 e123b6aa85fc172ed34f5772b002317d
IY88722_09.060908.epkg.Z 07748 19 a240624a427b0a81ff1e5855e23c1837
IY88699_03.060824.epkg.Z 50074 22 41b76112f55deeba34a4a8a63c9fc3fb
IY88699_04.060824.epkg.Z 23149 22 65dd39ec02ddc8c9732cfd31a2e4e79e
IY88699_05.060829.epkg.Z 55859 22 07654d6d53bb9801d36c2757ebd6be32
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 firstname.lastname@example.org
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.rte.lvm.
Interim Fileset Level Fileset Level
Fix (lower limit) (upper limit)
IY88722_07.060908.epkg.Z 126.96.36.199 188.8.131.52
IY88722_08.060908.epkg.Z 184.108.40.206 220.127.116.11
IY88722_09.060908.epkg.Z 18.104.22.168 22.214.171.124
IY88699_03.060824.epkg.Z 126.96.36.199 188.8.131.52
IY88699_04.060824.epkg.Z 184.108.40.206 220.127.116.11
IY88699_05.060829.epkg.Z 18.104.22.168 22.214.171.124
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 bit. Note that this may prevent the mkvg and extendvg
commands for functioning normally for non-root users. This can be done by
executing the following command:
# chmod 550 /usr/sbin/mkvg
Verify the changes:
# ls -la /usr/sbin/mkvg
- - -r-xr-x--- 2 root system 26314 Mar 5 2005 /usr/sbin/mkvg
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 email@example.com 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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