10 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:C/I:C/A:C
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
0.769 High
EPSS
Percentile
98.2%
IBM SECURITY ADVISORY
First Issued: Mon Apr 18 10:40:50 CDT 2016
|Updated: Tue Apr 19 09:58:35 CDT 2016
|Update: Clarified that the fixes for openssl_advisory18 cover the issue
| described in this bulletin.
The most recent version of this document is available here:
http://aix.software.ibm.com/aix/efixes/security/openssl_advisory19.asc
https://aix.software.ibm.com/aix/efixes/security/openssl_advisory19.asc
ftp://aix.software.ibm.com/aix/efixes/security/openssl_advisory19.asc
Security Bulletin: Vulnerability in OpenSSL affects AIX (CVE-2016-2842)
===============================================================================
SUMMARY:
This bulletin addresses CVE-2016-2842 for AIX.
===============================================================================
VULNERABILITY DETAILS:
OpenSSL vulnerabilities were disclosed on March 1, 2016 by the OpenSSL
Project. OpenSSL is used by AIX. AIX addressed the applicable CVEs with
the details provided in:
Multiple vulnerabilities in OpenSSL affect AIX
https://aix.software.ibm.com/aix/efixes/security/openssl_advisory18.asc
An additional CVE, CVE-2016-2842, was also fixed but was not initially
included in the March 1, 2016 OpenSSL Project announcement or in the
associated security bulletin for this product. This bulletin only
addresses CVE-2016-2842. Please see the bulletin linked above for the
other CVEs that were addressed by the March 1, 2016 OpenSSL Project.
CVEID: CVE-2016-2842
DESCRIPTION: OpenSSL is vulnerable to a denial of service, caused by the
failure to verify that a certain memory allocation succeeds by the
doapr_outch function. A remote attacker could exploit this
vulnerability using a specially crafted string to cause an
out-of-bounds write or consume an overly large amount of resources.
CVSS Base Score: 7.5
CVSS Temporal Score: See
https://exchange.xforce.ibmcloud.com/vulnerabilities/111304 for the
current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
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 0.9.8.401 0.9.8.2506 key_w_fs
openssl.base 1.0.1.500 1.0.1.515 key_w_fs
openssl.base 1.0.2.500 1.0.2.500 key_w_fs
openssl.base 12.9.8.1100 12.9.8.2506 key_w_fs
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.
| Please note that these fixes are the same as provided in
| openssl_advisory18. The fixes for openssl_advisory18 also cover
| the CVE described in this bulletin, CVE-2016-2842.
The fixes can be downloaded via ftp or http from:
ftp://aix.software.ibm.com/aix/efixes/security/openssl_fix18.tar
http://aix.software.ibm.com/aix/efixes/security/openssl_fix18.tar
https://aix.software.ibm.com/aix/efixes/security/openssl_fix18.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, and AIX OpenSSL fixes are cumulative.
AIX Level Interim Fix (*.Z) Fileset Name(prereq for installation) KEY
--------------------------------------------------------------------------------------------
5.3, 6.1, 7.1, 7.2 IV83169m9b.160401.epkg.Z openssl.base(0.9.8.2506) key_w_fix
5.3, 6.1, 7.1, 7.2 IV83169m9a.160401.epkg.Z openssl.base(1.0.1.515) key_w_fix
5.3, 6.1, 7.1, 7.2 IV83169s9d.160401.epkg.Z openssl.base(1.0.2.500) key_w_fix
5.3, 6.1, 7.1, 7.2 IV83169m9c.160401.epkg.Z openssl.base(12.9.8.2506) key_w_fix
VIOS Level Interim Fix (*.Z) Fileset Name(prereq for installation) KEY
--------------------------------------------------------------------------------------------
2.2.* IV83169m9b.160401.epkg.Z openssl.base(0.9.8.2506) key_w_fix
2.2.* IV83169m9a.160401.epkg.Z openssl.base(1.0.1.515) key_w_fix
2.2.* IV83169s9d.160401.epkg.Z openssl.base(1.0.2.500) key_w_fix
2.2.* IV83169m9c.160401.epkg.Z openssl.base(12.9.8.2506) key_w_fix
IBM recommends that the same certificate should ONLY be shared with
identical server configuration and software. If the same
certificate were shared with different server(s) configuration or
software, IBM recommends replacing the different server(s) with
unique certificates to protect against the DROWN exposure.
To extract the fixes from the tar file:
tar xvf openssl_fix18.tar
cd openssl_fix18
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
------------------------------------------------------------------------------------------------------
a5c629e778b9917e4d29edd996021a62874dcdc978d30cd56fb65395739d7f5a IV83169m9b.160401.epkg.Z key_w_csum
21dd42076309599682c56a92e1fceca793b6d7bb26bffd4b30d9aea9a429e26a IV83169m9a.160401.epkg.Z key_w_csum
7613b557bec19e1472a6e321ddff20d0026fee4c81097a81346a48f119347d67 IV83169s9d.160401.epkg.Z key_w_csum
14c8c21387f19eea212a964448a2ef1a0ecd1c8fb53f013b1035262d8aa6f831 IV83169m9c.160401.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
[email protected] 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_advisory19.asc.sig
https://aix.software.ibm.com/aix/efixes/security/openssl_advisory19.asc.sig
ftp://aix.software.ibm.com/aix/efixes/security/openssl_advisory19.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:
[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_pubkey.txt
To obtain the PGP public key that can be used to communicate
securely with the AIX Security Team via [email protected] 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 v3 Guide: http://www.first.org/cvss/user-guide
On-line Calculator v3: http://www.first.org/cvss/calculator/3.0
ACKNOWLEDGEMENTS:
None.
CHANGE HISTORY:
First Issued: Mon Apr 18 10:40:50 CDT 2016
| Updated: Tue Apr 19 09:58:35 CDT 2016
| Update: Clarified that the fixes for openssl_advisory18 cover the issue
| described in this bulletin.
===============================================================================
*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 βindustry open standard
designed to convey vulnerability severity and help to determine urgency and
priority of response.β IBM PROVIDES THE CVSS SCORES βAS ISβ 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.
10 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:C/I:C/A:C
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
0.769 High
EPSS
Percentile
98.2%