From: Secunia Security Advisories (sec-advsecunia.com)
Date: Wed Sep 30 2009 - 13:24:11 CDT

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TITLE:
IBM AIX NFSv4 Two Vulnerabilities

SECUNIA ADVISORY ID:
SA36894

VERIFY ADVISORY:
http://secunia.com/advisories/36894/

DESCRIPTION:
Two vulnerabilities have been reported in IBM AIX, which can be
exploited by malicious, local users and malicious people to bypass
certain security restrictions.

1) An unspecified error exists in the handling of the NFSv4 Kerberos
credential cache. This can be exploited by a local user to access a
Kerberized network share without authorisation.

2) An error exists due the nfs_portmon tunable not being correctly
utilised in NFSv4. This can be exploited to access network shares
protected by nfs_portmon without authorisation.

The vulnerabilities are reported in AIX 5.3 and 6.1.

SOLUTION:
Apply the security fixes or APARs.
http://aix.software.ibm.com/aix/efixes/security/nfs4_fix.tar

AIX 5.3.7:
Apply IZ50496

AIX 5.3.8:
Apply IZ50444

AIX 5.3.9:
Apply IZ50399

AIX 6.1.0:
Apply IZ49278

AIX 6.1.1:
Apply IZ49096

AIX 6.1.2:
Apply IZ49024

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Anton Lundin.

ORIGINAL ADVISORY:
IBM:
http://aix.software.ibm.com/aix/efixes/security/nfs4_advisory.asc

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