IBM SECURITY ADVISORY

First Issued : Thu May 21 05:06:05 CDT 2015

The most recent version of this document is available here:

http://aix.software.ibm.com/aix/efixes/security/nas_advisory3.asc
https://aix.software.ibm.com/aix/efixes/security/nas_advisory3.asc
ftp://aix.software.ibm.com/aix/efixes/security/nas_advisory3.asc

                       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-2014-5352

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

2. VULNERABILITY: AIX NAS Denial of Service via a zero-byte version string
   or by omitting the ‘\0’ character

   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-2014-5355

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

3. VULNERABILITY: AIX NAS Denial of Service via malformed XDR data

   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-2014-9421

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

4. VULNERABILITY: AIX NAS allows remote users to obtain administrative
   access by leveraging access to a two-component principal

   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-2014-9422

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

5. VULNERABILITY: AIX NAS allows remote users to obtain sensitive information
   from process heap memory

   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-2014-9423

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

===============================================================================
DETAILED INFORMATION

I. DESCRIPTION

1. CVE-2014-5352
Security context handles are not properly maintained, which allows 
remote authenticated users to cause a denial of service(use-after-free 
and double free, and daemon crash) or possibly execute arbitrary code 
via crafted GSSAPI traffic.

2. CVE-2014-5355
A remote attackers can cause a denial of service (NULL pointer dereference) 
via a zero-byte version string or  cause a denial of service(out-of-bounds 
read) by omitting the '\0' character. 

3. CVE-2014-9421
Remote authenticated users can cause a denial of service (use-after-free 
and double free, and daemon crash) or possibly execute arbitrary code via 
malformed XDR data. 

4. CVE-2014-9422
A remote authenticated users can obtain administrative access by leveraging 
access to a two-component principal with an initial "kadmind" substring. 

5. CVE-2014-9423
A remote attackers can obtain sensitive information from process heap memory 
by sniffing the network for data in a handle field 

II. CVSS

1. CVE-2014-5352
CVSS Base Score: 9.0
CVSS Temporal Score: https://exchange.xforce.ibmcloud.com/vulnerabilities/100842
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:S/C:C/I:C/A:C)

2. CVE-2014-5355
CVSS Base Score: 5.0
CVSS Temporal Score: https://exchange.xforce.ibmcloud.com/vulnerabilities/100972
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:P)

3. CVE-2014-9421
CVSS Base Score: 9.0
CVSS Temporal Score: https://exchange.xforce.ibmcloud.com/vulnerabilities/100841
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:S/C:C/I:C/A:C)

4. CVE-2014-9422
CVSS Base Score: 6.1
CVSS Temporal Score: https://exchange.xforce.ibmcloud.com/vulnerabilities/100840
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:H/Au:S/C:P/I:P/A:C)

5. CVE-2014-9423
CVSS Base Score: 5.0
CVSS Temporal Score: https://exchange.xforce.ibmcloud.com/vulnerabilities/100839
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:P/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 fileset levels are vulnerable:

    AIX Fileset      Lower Level  Upper Level   
    ------------------------------------------
    krb5.client.rte  1.4.0.8	1.6.0.2
    krb5.server.rte  1.4.0.8	1.6.0.2

Note, 1.4.0.8 is the Lowest NAS version available in aix web download site. 
Even NAS version below this 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/nas3_fix.tar

    The above link 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.

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 1.5.0.7 then apply the ifix -
1507c_fix.150404.epkg.Z if only krb5.client.rte is installed
1507s_fix.150407.epkg.Z if krb5.server.rte is installed

If the NAS fileset level is at 1.6.0.2 then apply the ifix -
1602c_fix.150404.epkg.Z if only krb5.client.rte is installed
1602s_fix.150407.epkg.Z if krb5.server.rte is installed

If the NAS fileset level is at 1.5.0.3/1.5.0.4, then 
upgrade to fileset level 1.6.0.2 and apply the ifix -
1602c_fix.150404.epkg.Z if only krb5.client.rte is installed
1602s_fix.150407.epkg.Z if krb5.server.rte is installed

For other fileset level, upgrade to fileset level 1.5.0.7
and apply the ifix -
1507c_fix.150404.epkg.Z if only krb5.client.rte is installed
1507s_fix.150407.epkg.Z if krb5.server.rte is installed

    To extract the fix from the tar file:

    tar xvf nas3_fix.tar
    cd nas3_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	 	    
    -------------------------------------------------------------------------------------------
4dc9f7af7f281d3b1b679230d7c957a107b0e14e471482ef86fbe2cff9a7672f	1507c_fix.150404.epkg.Z
fc4a7c777630380294c1835cca32b438882bb503a94b6ce43761a728ac05152b	1507s_fix.150407.epkg.Z
dd3356b711e822b5bd4599b4c327d047699cd492eed04d9d5b6c4d3042ef52e9	1602c_fix.150404.epkg.Z
a3ff287d83f05476ac64b72baebf17b69ffffc530c06ec44fb63b98359f332b6	1602s_fix.150407.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
[email protected] and describe the discrepancy.

Published advisory OpenSSL signature file location:

    http://aix.software.ibm.com/aix/efixes/security/nas_advisory3.asc.sig
  	https://aix.software.ibm.com/aix/efixes/security/nas_advisory3.asc.sig
 	ftp://aix.software.ibm.com/aix/efixes/security/nas_advisory13.asc.sig

    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:

    [email protected]

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:

        [email protected]

    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-2014-5352 : https://vulners.com/cve/CVE-2014-5352
CVE-2014-5355 : https://vulners.com/cve/CVE-2014-5355
CVE-2014-9421 : https://vulners.com/cve/CVE-2014-9421
CVE-2014-9422 : https://vulners.com/cve/CVE-2014-9422
CVE-2014-9423 : https://vulners.com/cve/CVE-2014-9423

*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.