Re: AIX 5.1/5.2/5.3 local root exploits (paginit issue)
cees-bart <ceesb@xxxxxxxx> wrote on 12/20/2004 05:10:41 AM:
> 2) the second is a classical stack overflow in a tool called paginit.
>
Note from the advisory below that AIX 5.1 is not affected by this issue.
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IBM SECURITY ADVISORY
First Issued: Mon Dec 20 12:57:11 CST 2004
===========================================================================
VULNERABILITY SUMMARY
VULNERABILITY: Buffer overflow vulnerability in paginit command
allows local users to gain root privileges.
PLATFORMS: AIX 5.2 and 5.3.
SOLUTION: Apply the workaround or APARs as described below.
THREAT: A local user can gain root privileges.
CERT VU Number: N/A
CVE Number: N/A
===========================================================================
DETAILED INFORMATION
I. Description
===============
A vulnerability was discovered in the paginit command that allows a local
user to gain root privileges. Exploits for this vulnerability are publicly
available.
The command affected by this issue ships as part of the bos.rte.security
fileset. This fileset is installed as part of the Base Operating System
Installation.
II. Impact
==========
Any local user can exploit this buffer overflow vulnerability to gain root
privileges.
III. Solutions
===============
A. Official Fix
IBM provides the following fixes:
APAR number for AIX 5.2.0: IY64522 (available)
APAR number for AIX 5.3.0: IY64312 (available)
NOTE: Affected customers are urged to upgrade to 5.2.0 or 5.3.0 at the
latest maintenance level. Although a related AIX 5.1 APAR is available,
this issue is not exploitable on AIX 5.1 since the paginit command
is not available on 5.1.
B. Workaround
Setting the file mode bits to 500 will allow only the root user to execute
the paginit command. This can be done by executing the following command
as
root:
# chmod 500 /usr/bin/paginit
Verify that the file mode bits have been changed to 500:
# ls -la /usr/bin/paginit
- -r-x------ 1 root security 7354 2002-09-15 20:39 /usr/bin/paginit
IV. Obtaining Fixes
===================
AIX Version 5 APARs can be downloaded from the eServer pSeries Fix Central
web site:
http://www-912.ibm.com/eserver/support/fixes/fcgui.jsp
Security related Emergency 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@xxxxxxxxxxxxxx
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Please contact your local IBM AIX support center for any assistance.
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IBM, AIX and pSeries are registered trademarks of International Business
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