IBM SECURITY ADVISORY

First Issued:Tue Jan 20 04:42:45 CST 2015

The most recent version of this document is available here:

http://aix.software.ibm.com/aix/efixes/security/nas_advisory2.asc
https://aix.software.ibm.com/aix/efixes/security/nas_advisory2.asc
ftp://aix.software.ibm.com/aix/efixes/security/nas_advisory2.asc

                       VULNERABILITY SUMMARY

VULNERABILITY: Return only new keys in randkey

PLATFORMS: AIX 5.3, 6.1 and 7.1
VIOS 2.X

SOLUTION: Apply the fix as described below.

THREAT: See below

CVE Numbers: CVE-2014-5351

Reboot required? NO
Workarounds? NO
Protected by FPM? NO
Protected by SED? NO

                       DETAILED INFORMATION

I. DESCRIPTION

CVE-2014-5351
kadmind sends old keys in a response to a -randkey -keepold request, which allows 
remote authenticated users to forge tickets by leveraging administrative access.

II. CVSS

CVE-2014-5351
CVSS Base Score:4
CVSS Temporal Score:see http://xforce.iss.net/xforce/xfdb/97028
CVSS Environmental Score*:Undefined
CVSS Vector: (AV:N/AC:L/Au:S/C:N/I:P/A:N)

III. PLATFORM VULNERABILITY ASSESSMENT

To determine if your system is vulnerable, execute the following
command to obtain the NAS fileset level:

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

The following fileset levels are vulnerable:

AIX 7.1, 6.1, 5.3: all NAS versions below 1.5.0.7 and 1.6.0.2 
VIOS 2.X: all NAS versions below 1.5.0.7 and 1.6.0.2 

Note: 
- NAS 1.6.0.x is a separate release branch for NAS SPNEGO feature.
- To find out whether the affected filesets are installed on your
  systems, refer to the lslpp command found in AIX user's guide.

IV. FIXES

A fix is available, and it can be downloaded from:

https://www14.software.ibm.com/webapp/iwm/web/preLogin.do?source=aixbp

If NAS SPNEGO feature is under use, then download NAS 1.6.0.2 version,
else download NAS 1.5.0.7 version.

To extract the fixes from the tar file:

zcat NAS_1.X.0.X_aix_image.tar.Z | tar xvf -

IMPORTANT: If possible, it is recommended that a mksysb backup
of the system be created.  Verify it is both bootable and
readable before proceeding.

To preview the fix installation:

installp -apYd . krb5

To install the fix package:

installp -aXYd . krb5

V. WORKAROUNDS

No workarounds.

VI. CONTACT INFORMATION

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

    http://www.ibm.com/systems/support

and click on the "My notifications" link.

To view previously issued advisories, please visit:

    http://www14.software.ibm.com/webapp/set2/subscriptions/onvdq

Comments regarding the content of this announcement can be
directed to:

    [email protected]

To obtain the PGP public key that can be used to communicate
securely with the AIX Security Team you can either:

    A. Send an email with "get key" in the subject line to:

        [email protected]

    B. Download the key from our web page:

http://www.ibm.com/systems/resources/systems_p_os_aix_security_pgpkey.txt

    C. Download the key from a PGP Public Key Server. The key ID is:

        0x28BFAA12

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.

VII. REFERENCES:

Complete CVSS Guide: http://www.first.org/cvss/cvss-guide.html
On-line Calculator V2: http://nvd.nist.gov/cvss.cfm?calculator&adv&version=2
X-Force Vulnerability Database: http://xforce.iss.net/xforce/xfdb/97028
CVE-2014-5351: https://vulners.com/cve/CVE-2014-5351

*The CVSS Environment Score is customer environment specific and will
ultimately impact the Overall CVSS Score. Customers can evaluate the
impact of this vulnerability in their environments by accessing the links
in the Reference section of this Flash.

Note: According to the Forum of Incident Response and Security Teams
(FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry
open standard designed to convey vulnerability severity and help to
determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES
"AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE
RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY
VULNERABILITY.