ESB-2018.1939 - [AIX] OpenSSL: Access privileged data - Existing account 2018-07-04

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.1939
           Vulnerability in OpenSSL affects AIX (CVE-2018-0737)
                                4 July 2018

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

Product:           OpenSSL
Publisher:         IBM
Operating System:  AIX
Impact/Access:     Access Privileged Data -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-0737  

Reference:         ESB-2018.1870
                   ESB-2018.1231
                   ESB-2018.1173

Original Bulletin: 
   https://www.ibm.com/support/docview.wss?uid=ibm10713441

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Security Bulletin: Vulnerability in OpenSSL affects AIX (CVE-2018-0737)

Security Bulletin

Document information
Software version: 5.3, 6.1, 7.1, 7.2
Operating system(s): AIX
Reference #: 0713441
Modified date: 02 July 2018

Summary

There is a vulnerability in OpenSSL used by AIX.

Vulnerability Details

CVEID: CVE-2018-0737
DESCRIPTION: The OpenSSL RSA Key generation algorithm has been shown to be
vulnerable to a cache timing side channel attack. An attacker with sufficient
access to mount cache timing attacks during the RSA key generation process
could recover the private key.
CVSS Base Score: 3.3
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
141679 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/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

FIXES

A fix is available, and it can be downloaded from:
https://www14.software.ibm.com/webapp/iwm/web/preLogin.do?source=aixbp

To extract the fixes from the tar file:

For Openssl 1.0.2 version -
zcat openssl-1.0.2.1500.tar.Z | tar xvf -

For 1.0.2 FIPS capable openssl version -
zcat openssl-20.13.102.1500.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.

Note that all the previously reported security vulnerability fixes are also
included in above mentioned fileset level. Please refer to the readme file
(provided along with the fileset) for the complete list of vulnerabilities
fixed.

To preview the fix installation:
installp -apYd . openssl

To install the fix package:
installp -aXYd . openssl
           
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_advisory27.asc.sig
https://aix.software.ibm.com/aix/efixes/security/openssl_advisory27.asc.sig
ftp://aix.software.ibm.com/aix/efixes/security/openssl_advisory27.asc.sig

Workarounds and Mitigations

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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