AusCERT - ESB-2004.0814 -- IBM Security Advisory -- Buffer overflow in paginit command

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ESB-2004.0814 -- IBM Security Advisory -- Buffer overflow in paginit command
Date: 22 December 2004

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             AUSCERT External Security Bulletin Redistribution

                  ESB-2004.0814 -- IBM Security Advisory
                    Buffer overflow in paginit command
                             22 December 2004

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           paginit
Publisher:         IBM
Operating System:  AIX 5.2 and 5.3
Impact:            Root Compromise
Access:            Existing Account

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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@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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This security bulletin is provided as a service to AusCERT's members.  As
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Incident Reporting Form at:

        http://www.auscert.org.au/render.html?it=3192

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
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