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AUSCERT External Security Bulletin Redistribution
ESB-2005.0504 -- IBM SECURITY ADVISORY
Buffer overflow vulnerability in getlvname allows root compromise
8 July 2005
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: getlvname
Publisher: IBM
Operating System: AIX 5.1, 5.2 and 5.3
Impact: Root Compromise
Access: Existing Account
Ref: ESB-2005.0431
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IBM SECURITY ADVISORY
First Issued: Thu Jun 9 13:31:06 CDT 2005
|Updated: Wed Jul 6 08:38:14 CDT 2005
|Added APAR and interim fix information.
==========================================================================
VULNERABILITY SUMMARY
VULNERABILITY: A buffer overflow vulnerability in the getlvname
command may allow any local user in the system group
to gain root privileges.
PLATFORMS: AIX 5.1, 5.2 and 5.3.
|Updated: Tue Jul 5 10:41:13 CDT 2005
|Added APAR and interim fix information.
|SOLUTION: Apply the APAR, interim fix or workaround as
| described below.
THREAT: A local users in the system group may gain root
privileges.
CERT VU Number: N/A
CVE Number: N/A
=========================================================================
DETAILED INFORMATION
I. Description
===============
A vulnerability was discovered in the getlvname command that allows a
local user in the system group to gain root privileges. Exploits for this
vulnerability may be publicly available.
The command affected by this issue ships as part of the bos.rte.lvm
fileset. To determine if this 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.
II. Impact
==========
A local user in the system group may exploit this buffer overflow
vulnerability to gain root privileges.
III. Solutions
===============
|Updated: Wed Jul 6 08:38:14 CDT 2005
|Added APAR and interim fix information.
|
|A. Official Fix
|
|IBM provides the following fixes:
|
| APAR number for AIX 5.1.0: IY72713 (available approx. 09/07/05)
| APAR number for AIX 5.2.0: IY72712 (available approx. 09/05/05)
| APAR number for AIX 5.3.0: IY72711 (available approx. 09/05/05)
|
|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/getlvname_ifix.tar.Z
|
|getlvname_ifix.tar.Z is a compressed tarball containing this advisory,
|three ifix packages cleartext PGP signatures for each ifix package.
|
|
|Verify you have retrieved the fixes intact:
|--------------------------------------------
|The checksums below were generated using the "sum" and "md5sum" commands
|and are as follows:
|
|Filename sum md5
|=======================================================================
|IY72713_08.epkg.Z 36193 10 176efdc3bad9abfcec9462385824bc88
|IY72712_04.epkg.Z 03452 10 5ca19bc5e53622f762880ea5a0758130
|IY72712_05.epkg.Z 03452 10 5ca19bc5e53622f762880ea5a0758130
|IY72712_06.epkg.Z 03452 10 5ca19bc5e53622f762880ea5a0758130
|IY72711_01.epkg.Z 61042 10 55be2e253348dacf836d5c7e0788f882
|IY72711_02.epkg.Z 61042 10 55be2e253348dacf836d5c7e0788f882
|
|
|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 fix 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
Setting the file mode bits to 500 will allow only the root user to execute
this command. This can be done by executing the following command as root:
# chmod 500 /usr/sbin/getlvname
Verify that the file mode bits have been updated:
# ls -la /usr/sbin/getlvname
- - - -r-x------ 1 root system 8392 May 16 14:30 /usr/sbin/getlvname
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. 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.
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