5.9 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
4.3 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:M/Au:N/C:P/I:N/A:N
0.946 High
EPSS
Percentile
99.2%
IBM SECURITY ADVISORY
First Issued: Mon Jan 29 10:36:55 CST 2018
The most recent version of this document is available here:
http://aix.software.ibm.com/aix/efixes/security/openssl_advisory25.asc
https://aix.software.ibm.com/aix/efixes/security/openssl_advisory25.asc
ftp://aix.software.ibm.com/aix/efixes/security/openssl_advisory25.asc
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
https://vulners.com/cve/CVE-2017-3737
https://vulners.com/cve/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
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(prereq for installation) KEY
--------------------------------------------------------------------------------------------
5.3, 6.1, 7.1, 7.2 102m_ifix.180105.epkg.Z openssl.base(1.0.2.1300) key_w_fix
5.3, 6.1, 7.1, 7.2 fips_102m.180105.epkg.Z openssl.base(20.13.102.1300) key_w_fix
VIOS Level Interim Fix (*.Z) Fileset Name(prereq for installation) KEY
--------------------------------------------------------------------------------------------
2.2.* 102m_ifix.180105.epkg.Z openssl.base(1.0.2.1300) key_w_fix
2.2.* fips_102m.180105.epkg.Z openssl.base(20.13.102.1300) key_w_fix
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.
===============================================================================
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
https://www.ibm.com/support/mynotifications
To view previously issued advisories, please visit:
http://www14.software.ibm.com/webapp/set2/subscriptions/onvdq
https://www14.software.ibm.com/webapp/set2/subscriptions/onvdq
Contact IBM Support for questions related to this announcement:
http://ibm.com/support/
https://ibm.com/support/
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
https://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 :
A. Download the key from our web page:
http://www.ibm.com/systems/resources/systems_p_os_aix_security_pgppubkey.txt
https://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
https://www.first.org/cvss/user-guide
On-line Calculator v3:
http://www.first.org/cvss/calculator/3.0
https://www.first.org/cvss/calculator/3.0
RELATED INFORMATION:
Security Bulletin: Vulnerability in OpenSSL affects AIX (CVE-2017-3737)
http://www-01.ibm.com/support/docview.wss?uid=isg3T1026943
ACKNOWLEDGEMENTS:
None.
CHANGE HISTORY:
First Issued: Mon Jan 29 10:36:55 CST 2018
===============================================================================
*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.
5.9 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
4.3 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:M/Au:N/C:P/I:N/A:N
0.946 High
EPSS
Percentile
99.2%