ESB-2018.0303 - [AIX] IBM AIX Enterprise Edition: Access privileged data - Remote/unauthenticated 2018-01-31

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.0303
  Security Bulletin: Vulnerability in OpenSSL affects AIX (CVE-2017-3737)
                              31 January 2018

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           IBM AIX Enterprise Edition
Publisher:         IBM
Operating System:  AIX
Impact/Access:     Access Privileged Data -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-3737  

Reference:         ASB-2018.0026
                   ASB-2018.0013
                   ESB-2017.3144.2

Original Bulletin: 
   http://www.ibm.com/support/docview.wss?uid=isg3T1026943

- --------------------------BEGIN INCLUDED TEXT--------------------

Document information

More support for: AIX Enterprise Edition

Software version: 5.3, 6.1, 7.1, 7.2

Operating system(s): AIX

Software edition: Enterprise, Standard

Reference #: T1026943

Modified date: 29 January 2018


Security Bulletin: Vulnerability in OpenSSL affects AIX (CVE-2017-3737)


Summary

There is a vulnerability in OpenSSL used by AIX.


Vulnerability Details

CVEID: CVE-2017-3737

DESCRIPTION: OpenSSL could allow a remote attacker to bypass security 
restrictions, caused by a flaw in the "error state" mechanism when directly 
calling SSL_read() or SSL_write() for an SSL object after receiving a fatal 
error. An attacker could exploit this vulnerability to bypass the 
decryption or encryption process and perform unauthorized actions.

CVSS Base Score: 5.9 

CVSS Temporal Score: See
https://exchange.xforce.ibmcloud.com/vulnerabilities/136077 for the current 
score 

CVSS Environmental Score*: Undefined 

CVSS Vector:(CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N) 


Affected Products and Versions

AIX 5.3, 6.1, 7.1, 7.2
VIOS 2.2.x

The following fileset levels are vulnerable:

key_fileset = osrcaix

    Fileset        Lower Level    Upper Level    KEY
    ------------------------------------------------------ 
    openssl.base   1.0.2.500      1.0.2.1300     key_w_fs 
    openssl.base   20.13.102.1000 20.13.102.1300 key_w_fs

Note: 

A. 0.9.8, 1.0.1 OpenSSL versions are out-of-support. Customers are
advised to upgrade to currently supported OpenSSL 1.0.2 version.

B. Latest level of OpenSSL fileset is available from the web download site:

https://www14.software.ibm.com/webapp/iwm/web/reg/download.do?source=aixbp&lang=en_US&S_PKG=openssl&cp=UTF-8

To find out whether the affected filesets are installed on your systems, refer
to the lslpp command found in the AIX user's guide.

Example: lslpp -L | grep -i openssl.base 


Remediation/Fixes

A. FIXES

The fixes can be downloaded via ftp or http from:

ftp://aix.software.ibm.com/aix/efixes/security/openssl_fix25.tar
http://aix.software.ibm.com/aix/efixes/security/openssl_fix25.tar
https://aix.software.ibm.com/aix/efixes/security/openssl_fix25.tar

The links above are 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 Technology Levels.

Note that the tar file contains Interim fixes that are based on OpenSSL
version, and AIX OpenSSL fixes are cumulative.

You must be on the 'prereq for installation' level before applying the interim
fix. This may require installing a new level(prereq version) first.


AIX Level           Interim Fix (*.Z)        Fileset Name 	KEY
					     (prereq for
					      installation)
- -------------------------------------------------------------------------
5.3, 6.1, 7.1, 7.2  102m_ifix.180105.epkg.Z  openssl.base 	key_w_fix 
					     (1.0.2.1300)

5.3, 6.1, 7.1, 7.2  fips_102m.180105.epkg.Z  openssl.base       key_w_fix
					     (20.13.102.1300)


VIOS Level     Interim Fix (*.Z)             Fileset Name 	KEY
    					     (prereq for
					      installation)
- -------------------------------------------------------------------------
2.2.*          102m_ifix.180105.epkg.Z       openssl.base 	key_w_fix
					     (1.0.2.1300)

2.2.*          fips_102m.180105.epkg.Z	     openssl.base       key_w_fix
					     (20.13.102.1300)


To extract the fixes from the tar file:

    tar xvf openssl_fix25.tar cd openssl_fix25

Verify you have retrieved the fixes intact:

The checksums below were generated using the "openssl dgst -sha256 file"
command as the followng:

openssl dgst -sha256                                              filename		   KEY
- ------------------------------------------------------------------------------------------------------
dbc850209a5920c95493125817dd2cdc90fbc01f44f31dd1c4b19c889cf446e9  102m_ifix.180105.epkg.Z  key_w_csum
86b9ee0f6367f783fbad4c8a98a32d0481c18252c57ae5ac043cea1bf3d8f0b4  fips_102m.180105.epkg.Z  key_w_csum


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 Support at
https://ibm.com/support/ 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]

Published advisory OpenSSL signature file location:

http://aix.software.ibm.com/aix/efixes/security/openssl_advisory25.asc.sig
https://aix.software.ibm.com/aix/efixes/security/openssl_advisory25.asc.sig
ftp://aix.software.ibm.com/aix/efixes/security/openssl_advisory25.asc.sig

B. FIX AND INTERIM FIX INSTALLATION

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.


Workarounds and Mitigations

None.


Acknowledgement

None.

*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 Security Bulletin.  


Disclaimer

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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