CVE-2014-4343: AIX NAS denial of service vulnerability PDF Print E-mail
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Written by Michael Felt   

IBM First Issued : Thu Aug 28 03:15:00 CDT 2014 a security announcement that may affect you if you are using kerberos.

The CVSS score is 5.0 - Details below

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 NAS fileset levels are vulnerable:

A. CVE-2014-4341
All krb5.server.rte/krb5.client.rte fileset levels 1.5.0.* and 1.6.0.1 are impacted

B. CVE-2014-4343, CVE-2014-4344
Only krb5.server.rte/krb5.client.rte fileset levels 1.5.0.3, 1.5.0.4 and 1.6.0.1 are impacted

 
===============================================================================
VULNERABILITY SUMMARY
1.VULNERABILITY:   AIX NAS denial of service vulnerability 
PLATFORMS:       AIX 5.3, 6.1 and 7.1
VIOS 2.2.*
SOLUTION:        Apply the fix as described below.
THREAT:          See below
CVE Numbers:     CVE-2014-4341
Reboot required?    NO
Workarounds?        NO
Protected by FPM?   NO
Protected by SED?   NO
2. VULNERABILITY:   AIX NAS double-free in SPNEGO
PLATFORMS:       AIX 5.3, 6.1 and 7.1
VIOS 2.2.*
SOLUTION:        Apply the fix as described below.
THREAT:          See below
CVE Numbers:     CVE-2014-4343
Reboot required?    NO
Workarounds?        NO
Protected by FPM?   NO
Protected by SED?   NO
3. VULNERABILITY:   AIX NAS null deref in SPNEGO acceptor
PLATFORMS:       AIX 5.3, 6.1 and 7.1
VIOS 2.2.*
SOLUTION:        Apply the fix as described below.
THREAT:          See below
CVE Numbers:     CVE-2014-4344
Reboot required?    NO
Workarounds?        NO
Protected by FPM?   NO
Protected by SED?   NO
===============================================================================
DETAILED INFORMATION
I. DESCRIPTION 
1. CVE-2014-4341
Remote attackers can cause a denial of service (buffer over-read and 
application crash) by injecting invalid tokens into a GSSAPI 
application session
2. CVE-2014-4343
An unauthenticated remote attacker with the ability to spoof packets 
appearing to be from a GSSAPI acceptor can cause 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
3. CVE-2014-4344
An unauthenticated or partially authenticated remote attacker can 
cause a NULL dereference and application crash during a SPNEGO 
negotiation by sending an empty token as the second or later 
context token from initiator to acceptor.
II. CVSS
1. CVE-2014-4341
CVSS Base Score: 5.0
CVSS Temporal Score: http://xforce.iss.net/xforce/xfdb/94904
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:C/I:N/A:N)
2. CVE-2014-4343
CVSS Base Score: 5.0
CVSS Temporal Score: http://xforce.iss.net/xforce/xfdb/95211
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:C/I:N/A:N)
3. CVE-2014-4344
CVSS Base Score: 5.0
CVSS Temporal Score: http://xforce.iss.net/xforce/xfdb/95210
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:C/I:N/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 NAS fileset levels are vulnerable:
A. CVE-2014-4341
All krb5.server.rte/krb5.client.rte fileset levels 1.5.0.* 
and 1.6.0.1 are impacted
B. CVE-2014-4343, CVE-2014-4344
Only krb5.server.rte/krb5.client.rte fileset levels 1.5.0.3, 1.5.0.4 
and 1.6.0.1 are impacted
IV. SOLUTIONS
A. FIXES
Fix is available. The fix can be downloaded via ftp
from:
ftp://aix.software.ibm.com/aix/efixes/security/nas1_fix.tar
The link above is to a tar file containing this signed
advisory, fix packages, and OpenSSL signatures for each package.
The fixes below include prerequisite checking. This will
enforce the correct mapping between the fixes and AIX
releases.
Note that the tar file contains Interim fixes that are based on NAS 
fileset levels.
AIX Level 5.3, 6.1, 7.1 and VIOS Level 2.2.*
-------------------------------------------- 
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 level, 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 - 
https://www14.software.ibm.com/webapp/iwm/web/reg/download.do?source=aixbp&lang=en_US&S_PKG=nas&cp=UTF-8
To extract the fix from the tar file:
tar xvf nas1_fix.tar
cd nas1_fix
Verify you have retrieved the fix intact:
The checksums below were generated using the
"openssl dgst -sha256 file" command is the followng:
openssl dgst -sha256                                          filename         
-------------------------------------------------------------------------------------------
d2f160fec2295017aac32dbf85ff44bbd181cf0aa2c097222ddf576db8377e52    1506_fix.140813.epkg.Z  
f9394ffaae3cd4e7f474c4a239a9903560f0e07e6bd37c754cd7c9a26191cfdc  1601_fix.140813.epkg.Z
These sums should match exactly. The OpenSSL signatures in the tar
file and on this advisory can also be used to verify the
integrity of the fixes.  If the sums or signatures cannot be
confirmed, contact IBM AIX Security at
 
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 </script> and describe the discrepancy.
openssl dgst -sha1 -verify <pubkey_file> -signature <advisory_file>.sig <advisory_file>
openssl dgst -sha1 -verify <pubkey_file> -signature <ifix_file>.sig <ifix_file>
B. FIX AND INTERIM FIX INSTALLATION
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 a fix installation:
installp -a -d fix_name -p all  # where fix_name is the name of the
# fix package being previewed.
To install a fix package:
installp -a -d fix_name -X all  # where fix_name is the name of the
# fix package being installed.
Interim fixes have had limited functional and regression
testing but not the full regression testing that takes place
for Service Packs; however, IBM does fully support them.
Interim fix management documentation can be found at:
http://www14.software.ibm.com/webapp/set2/sas/f/aix.efixmgmt/home.html
To preview an interim fix installation:
emgr -e ipkg_name -p         # where ipkg_name is the name of the
# interim fix package being previewed.
To install an interim fix package:
emgr -e ipkg_name -X         # where ipkg_name is the name of the
# interim fix package being installed.
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:
 
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 document.write( addy61615 );
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 //-->\n </script><script language='JavaScript' type='text/javascript'>
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 <script language='JavaScript' type='text/javascript'>
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 document.write( '</' );
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 </script>
To obtain the OpenSSL public key that can be used to verify the
signed advisories and ifixes:
Download the key from our web page:
http://www.ibm.com/systems/resources/systems_p_os_aix_security_pgpkey.txt
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:
 
 <script language='JavaScript' type='text/javascript'>
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 document.write( '<a ' + path + '\'' + prefix + ':' + addy61615 + '\'>' );
 document.write( addy61615 );
 document.write( '<\/a>' );
 //-->\n </script><script language='JavaScript' type='text/javascript'>
 <!--
 document.write( '<span style=\'display: none;\'>' );
 //-->
 </script>This e-mail address is being protected from spam bots, you need JavaScript enabled to view it
 <script language='JavaScript' type='text/javascript'>
 <!--
 document.write( '</' );
 document.write( 'span>' );
 //-->
 </script>
B. 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.
VII. REFERENCES:
Note: Keywords labeled as KEY in this document are used for parsing purposes.
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.
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
CVE-2014-4341 : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-4341
CVE-2014-4343 : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-4343
CVE-2014-4344 : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-4344
*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.
 
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