AIX NAS Advisory : nas_advisory1.asc
High Nessus Plugin ID 77532
Synopsis
The remote AIX host has a version of NAS installed that is affected by multiple vulnerabilities.
Description
The version of the Network Authentication Service (NAS) installed on the remote AIX host is affected by the following vulnerabilities related to Kerberos 5 :
- An attacker can cause a denial of service (buffer over-read and application crash) by injecting invalid tokens into a GSSAPI application session.
(CVE-2014-4341)
- An attacker with the ability to spoof packets appearing to be from a GSSAPI acceptor can cause a denial of service or execute arbitrary code by using a double-free condition in GSSAPI initiators (clients) which are using the SPNEGO mechanism, by returning a different underlying mechanism than was proposed by the initiator.
(CVE-2014-4343)
- An attacker can cause a denial of service through a NULL pointer dereference and application crash during a SPNEGO negotiation, by sending an empty token as the second or later context token from initiator to acceptor. (CVE-2014-4344)
Solution
A fix is available and can be downloaded from the AIX website.
If the NAS fileset level is at 1.5.0.6, then apply the ifix '1506_fix.140813.epkg.Z'.
If the NAS fileset level is at 1.6.0.1, then apply the ifix '1601_fix.140813.epkg.Z'.
If the NAS fileset level is at 1.5.0.3/1.5.0.4, then upgrade to fileset level 1.6.0.1 and apply the ifix '1601_fix.140813.epkg.Z'.
For other fileset levels, upgrade to fileset level 1.5.0.6 and apply the ifix '1506_fix.140813.epkg.Z'.
These fixes will also be part of the next filesets of NAS versions 1.5.0.7 and 1.6.0.2.
These filesets will be made available by 14th November 2014 and can be downloaded from the AIX website.
To extract the fixes from the tar file, use the commands : tar xvf nas1_fix.tar cd nas1_fix
IMPORTANT : If possible, it is recommended that a mksysb backup of the system be created. Verify that it is both bootable and readable before proceeding.
To preview the fix installation, use the command :
installp -a - fix_name -p all
To install the fix package, use the command :
installp -a - fix_name -X all