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AUSCERT External Security Bulletin Redistribution
ESB-2016.0147
Vulnerabilities in OpenSSL affect AIX
21 January 2016
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: IBM AIX
Publisher: IBM
Operating System: AIX
Impact/Access: Denial of Service -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2015-3196 CVE-2015-3195 CVE-2015-3194
Reference: ASB-2016.0004
ESB-2015.3042
Original Bulletin:
https://aix.software.ibm.com/aix/efixes/security/openssl_advisory15.asc
- --------------------------BEGIN INCLUDED TEXT--------------------
Vulnerabilities in OpenSSL affect AIX
IBM SECURITY ADVISORY
First Issued: Mon Jan 18 10:47:32 CST 2016
The most recent version of this document is available here:
http://aix.software.ibm.com/aix/efixes/security/openssl_advisory15.asc
https://aix.software.ibm.com/aix/efixes/security/openssl_advisory15.asc
ftp://aix.software.ibm.com/aix/efixes/security/openssl_advisory15.asc
Security Bulletin: Vulnerabilities in OpenSSL affect AIX
CVE-2015-3194 CVE-2015-3195 CVE-2015-3196
===============================================================================
SUMMARY:
There are multiple vulnerabilities in OpenSSL that impact AIX.
===============================================================================
VULNERABILITY DETAILS:
CVEID: CVE-2015-3194
DESCRIPTION: OpenSSL allows remote attackers to cause a denial of service
(NULL pointer dereference and application crash) via an RSA PSS ASN.1
signature that lacks a mask generation function parameter.
CVSS Base Score: 5.3
CVSS Temporal Score: See
https://exchange.xforce.ibmcloud.com/vulnerabilities/108503 for the
current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:P)
CVEID: CVE-2015-3195
DESCRIPTION: The ASN1_TFLG_COMBINE implementation in OpenSSL mishandles
errors caused by malformed X509_ATTRIBUTE data, which allows remote
attackers to obtain sensitive information from process memory by
triggering a decoding failure in a PKCS#7 or CMS application.
CVSS Base Score: 5.3
CVSS Temporal Score: See
https://exchange.xforce.ibmcloud.com/vulnerabilities/108504 for the
current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:P/I:N/A:N)
CVEID: CVE-2015-3196
DESCRIPTION: OpenSSL when used for a multi-threaded client, writes the
PSK identity hint to an incorrect data structure, which allows remote
servers to cause a denial of service (race condition and double free)
via a crafted ServerKeyExchange message.
CVSS Base Score: 3.7
CVSS Temporal Score: See
https://exchange.xforce.ibmcloud.com/vulnerabilities/108505 for the
current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:M/Au:N/C:N/I:N/A:P)
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
A. CVE-2015-3194, CVE-2015-3196
Fileset Lower Level Upper Level KEY
--------------------------------------------------
openssl.base 1.0.1.500 1.0.1.515 key_w_fs
B. CVE-2015-3195
Fileset Lower Level Upper Level KEY
--------------------------------------------------
openssl.base 1.0.1.500 1.0.1.515 key_w_fs
openssl.base 0.9.8.401 0.9.8.2506 key_w_fs
openssl.base 12.9.8.1100 12.9.8.2506 key_w_fs
Note, 0.9.8.401 and 12.9.8.1100 are the Lowest OpenSSL version
available in aix web download site. Even OpenSSL versions below
this are impacted
Note: to find out whether the affected filesets are installed
on your systems, refer to the lslpp command found in AIX user's guide.
Example: lslpp -L | grep -i openssl.base
REMEDIATION:
A. FIXES
Fixes are available.
The fixes can be downloaded via ftp or http from:
ftp://aix.software.ibm.com/aix/efixes/security/openssl_fix15.tar
http://aix.software.ibm.com/aix/efixes/security/openssl_fix15.tar
https://aix.software.ibm.com/aix/efixes/security/openssl_fix15.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
Technology Levels.
Note that the tar file contains Interim fixes that are based on
OpenSSL version.
AIX Level Interim Fix (*.Z)
Fileset Name(prereq for installation) KEY
-----------------------------------------------
---------------------------------------------
5.3, 6.1, 7.1, 7.2 101_ifix.151218.epkg.Z
openssl.base(1.0.1.515 version) key_w_fix
5.3, 6.1, 7.1, 7.2 098_ifix.151218.epkg.Z
openssl.base(0.9.8.2506 version) key_w_fix
5.3, 6.1, 7.1, 7.2 1298_ifix.151218.epkg.Z
openssl.base(12.9.8.2506 version) key_w_fix
VIOS Level Interim Fix (*.Z)
Fileset Name(prereq for installation) KEY
---------------------------------------------------
-----------------------------------------
2.2.* 101_ifix.151218.epkg.Z
openssl.base(1.0.1.515 version) key_w_fix
2.2.* 098_ifix.151218.epkg.Z
openssl.base(0.9.8.2506 version) key_w_fix
2.2.* 1298_ifix.151218.epkg.Z
openssl.base(12.9.8.2506 version) key_w_fix
To extract the fixes from the tar file:
tar xvf openssl_fix15.tar
cd openssl_fix15
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
---------------------------------------------------------------
-------------------------------------
b65b7ce60380ac988767dd4319002ceb82c18d4786f8d6de014b58028f8bf847
101_ifix.151218.epkg.Z key_w_csum
0fb34df46591a4c4ff9c468e75da2e9c0a7541f3a0cda325c2fe28df1baa0571
098_ifix.151218.epkg.Z key_w_csum
d820d31b37fb9ffb51abdd504066f6a752fb0b8d83d305a6b7f4267161d5cf61
1298_ifix.151218.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 Security at
security-alert@austin.ibm.com and describe the discrepancy.
openssl dgst -sha1 -verify -signature
.sig
openssl dgst -sha1 -verify -signature .sig
Published advisory OpenSSL signature file location:
http://aix.software.ibm.com/aix/efixes/security/openssl_advisory15.asc.sig
https://aix.software.ibm.com/aix/efixes/security/openssl_advisory15.asc.sig
ftp://aix.software.ibm.com/aix/efixes/security/openssl_advisory15.asc.sig
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.
WORKAROUNDS AND MITIGATIONS:
None.
===============================================================================
CONTACT US:
Note: Keywords labeled as KEY in this document are used for parsing
purposes.
If you would like to receive AIX Security Advisories via email,
please visit "My Notifications":
http://www.ibm.com/support/mynotifications
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:
security-alert@austin.ibm.com
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_pubkey.txt
To obtain the PGP public key that can be used to communicate
securely with the AIX Security Team via security-alert@austin.ibm.com you
can either:
A. Download the key from our web page:
http://www.ibm.com/systems/resources/systems_p_os_aix_security_pgppubkey.txt
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.
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
ACKNOWLEDGEMENTS:
None
CHANGE HISTORY:
First Issued: Mon Jan 18 10:47:32 CST 2016
===============================================================================
*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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