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AUSCERT External Security Bulletin Redistribution
ESB-2005.0445 -- IBM SECURITY ADVISORY
Buffer overflow vulnerability in penable command
14 June 2005
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AusCERT Security Bulletin Summary
---------------------------------
Product: penable
Publisher: IBM
Operating System: AIX 5.3
AIX 5.2
AIX 5.1
Impact: Root Compromise
Access: Existing Account
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IBM SECURITY ADVISORY
First Issued: Fri Jun 10 13:12:27 CDT 2005
==========================================================================
VULNERABILITY SUMMARY
VULNERABILITY: A buffer overflow vulnerability in the penable command
may allow any local user in the system group to gain
root privileges.
PLATFORMS: AIX 5.1, 5.2 and 5.3.
SOLUTION: Apply the workaround as described below.
THREAT: A local user 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 penable command that allows a
local user in the system group to gain root privileges. Exploits for this
vulnerability may be publicly available. penable is one of six hard links.
The other hard links are pdisable, pstart, phold, pdelay and pshare. These
commands are used to perform various port management functions.
The command affected by this issue ships as part of the bos.rte.control
fileset. To determine if this fileset is installed, execute the following
command:
# lslpp -w /usr/sbin/penable
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
===============
A. APARs and interim fixes
APARs and interim fixes will be provided. An updated advisory will be
published when these fixes are available.
B. 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/penable
Since penable, pdisable, pstart, phold, pdelay and pshare are hard links to
the same file, they will all be affected by this change.
Verify that the file mode bits have been updated:
# ls -la /usr/sbin/penable
- - -r-x------ 6 root system 19366 May 16 14:30 /usr/sbin/penable
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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