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AUSCERT External Security Bulletin Redistribution
ESB-2017.0931
Security Bulletin: A vulnerability in OpenSSL affects IBM
DataPower Gateways (CVE-2016-2183)
11 April 2017
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AusCERT Security Bulletin Summary
---------------------------------
Product: IBM DataPower Gateways
Publisher: IBM
Operating System: Network Appliance
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Provide Misleading Information -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2016-2183
Reference: ESB-2017.0433
Original Bulletin:
http://www.ibm.com/support/docview.wss?uid=swg22000968
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Security Bulletin: A vulnerability in OpenSSL affects IBM DataPower Gateways
(CVE-2016-2183)
Security Bulletin
Document information
More support for:
IBM DataPower Gateways
Software version:
7.0.0, 7.1, 7.2, 7.5, 7.5.1, 7.5.2
Operating system(s):
Firmware
Reference #:
2000968
Modified date:
10 April 2017
Summary
A vulnerability in the SSL/TLS protocol affects the ISAM Access Manager
client and JMS. IBM DataPower Gateways has fully addressed the applicable CVE
in version 7.5.2, and in earlier releases it was addressed with a combination
of a code fix and a workaround.
Vulnerability Details
CVEID:
CVE-2016-2183
DESCRIPTION:
OpenSSL could allow a remote attacker to obtain sensitive information, caused
by an error in the DES/3DES cipher, used as a part of the SSL/TLS protocol.
By capturing large amounts of encrypted traffic between the SSL/TLS server
and the client, a remote attacker able to conduct a man-in-the-middle attack
could exploit this vulnerability to recover the plaintext data and obtain
sensitive information. This vulnerability is known as the SWEET32 Birthday
attack.
CVSS Base Score: 3.7
CVSS Temporal Score: See
https://exchange.xforce.ibmcloud.com/vulnerabilities/116337
for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N)
Affected Products and Versions
IBM DataPower Gateway, versions 7.0.0.0-7.0.0.17, 7.1.0.0-7.1.0.14,
7.2.0.0-7.2.0.11, 7.5.0.0-7.5.0.5, 7.5.1.0-7.5.1.4, 7.5.2.0-7.5.2.2
Remediation/Fixes
Fix is available in versions 7.0.0.18, 7.1.0.15, 7.2.0.12, 7.5.0.6, 7.5.1.5,
7.5.2.3. Refer to
APAR IT19703
for URLs to download the fix. The fix applies to JMS traffic in all versions,
and to ISAM traffic in 7.5.2.3 only.
You should verify applying this fix does not cause any compatibility issues.
For versions 7.0.0, 7.1.0, 7.2.0, 7.5.0 and 7.5.1, the ISAM (TAM) Access
Manager Client does not include a fix for this vulnerability. Customers using
the Access Manager Client on versions below 7.5.2.3 should follow the
directions in the "Workarounds and Mitigations" section of this bulletin.
For DataPower customers using versions 6.x and earlier versions, IBM
recommends upgrading to a fixed, supported version/release/platform of the
product.
Workarounds and Mitigations
Customers using ISAM (TAM) Access Manager Client in versions 7.0.0, 7.1.0,
7.2.0, 7.5.0, 7.5.1 and 7.5.2.0-7.5.2.2 are exposed to this vulnerability if
the Access Manager connections are configured to permit the use of triple-DES
ciphers, and if large amounts (many gigabytes) of data are transmitted over a
single Access Manager connection.
To avoid the vulnerability, customers may either limit the data they send to
well below 32GB, or may configure their Access Manager connections to use
only AES ciphers. This configuration can be done on the Access Manager
server, where it will be in effect for all clients.
Additionally, the Access Manager Client within the IBM DataPower Gateway for
TAM 7 or higher can be configured to remove DES-based ciphers by modifying
the [SSL] stanza of the Access Manager Client configuration file to remove
DES-based algorithms, as described in the following document:
https://www.ibm.com/support/knowledgecenter/SSPREK_7.0.0/com.ibm.isam.doc_70/ameb_baseadmin_guide/concept/con_ssl.html
The Access Manager Client for TAM 6.1.1 and lower cannot be configured in
this way. TAM 6.1.1 and lower clients must rely on TAM traffic negotiating
AES over DES-based ciphers. TAM 7 and higher servers can be configured not to
allow DES-based cipher suites; TAM 6.1.1 and lower always offers AES before
DES, and will therefore not negotiate a DES cipher suite.
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References
Complete CVSS v3 Guide
On-line Calculator v3
Related information
IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog
Change History
10 April 2017 Original Version Published
*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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