Hash: SHA1

             AUSCERT External Security Bulletin Redistribution

                          ESB-2007.0223 -- [AIX]
              IBM AIX Network Authentication Service advisory
                               5 April 2007


        AusCERT Security Bulletin Summary

Product:              Network Authentication Service 1.3 and 1.4
Publisher:            IBM
Operating System:     AIX 5.3
                      AIX 5.2
Impact:               Execute Arbitrary Code/Commands
Access:               Remote/Unauthenticated
CVE Names:            CVE-2007-1216 CVE-2007-0957 CVE-2007-0956

Ref:                  AL-2007.0040

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Hash: SHA1


First Issued: Tue Apr  3 13:39:48 CDT 2007
                           VULNERABILITY SUMMARY

VULNERABILITY:      A double free vulnerability may allow an attacker to
                    execute arbitrary code.
PLATFORMS:          Network Authentication Service 1.3 and 1.4
                    for AIX 5.2 and AIX 5.3.

SOLUTION:           Apply the fixes described below.

THREAT:             A remote attacker may execute arbitrary code on the
                    host running kadmind

CERT VU Number:     VU#419344  
CVE Number:         CVE-2007-1216 

                           DETAILED INFORMATION

I.  Description
The MIT Kerberos team recently reported various vulnerabilities in Kerberos
version 5. Kerberos is available for AIX via Network Authentication Service
on the Expansion Pack. Network Authentication Service for AIX is not
affected by MITKRB5-SA-2007-001 (CVE-2007-0956, VU#220816) or
MITKRB5-SA-2007-002 (CVE-2007-0957, VU#704024).

MITKRB5-SA-2007-003 (CVE-2007-1216,VU#419344) may allow an attacker to
execute arbitrary code on the host running kadmind. kamind runs as root so
the attacker could execute arbitrary code with root privileges. More
information about security vulnerabilities in MIT kerberos can be found at

The following versions of Network Authentication Service are vulnerable:
     * Network Authentication Service through
     * Network Authentication Service through

To determine which version of Network Authentication Service is installed,
execute the following commands:

# lslpp -L krb5.client.rte
# lslpp -L krb5.server.rte

If the filesets are installed they will be listed along with version
information, state, type and a description. The first command prints
information for the client fileset and the second command prints
information for the server fileset. Affected hosts should upgrade all
affected Network Authentication Service filesets that are installed.

II. Impact

A remote attacker may cause execute arbitrary code on a host running

III.  Solutions

A. Fix
IBM provides the following fixes:

      AIX 5.2.0: Install Network Authentication Service version or  Customers may contact AIX Support to request either

      AIX 5.3.0: Install Network Authentication Service version or Customers may contact AIX Support to request
      either versions. Version will also available on the AIX 5L
      for POWER V5.3 Expansion Pack available in November 2007.  (form
      number LCD4-7460-08).

IV.  Contact Information

If you would like to receive AIX Security Advisories via email, please visit:

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 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 0x3AE561C3.

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.

Version: GnuPG v1.4.6 (GNU/Linux)


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