Security Bulletin
Summary
SSLv3 contains a vulnerability that has been referred to as the Padding Oracle On Downgraded Legacy Encryption (POODLE) attack. Supported versions of CICS Transaction Gateway for Mutliplatforms and CICS Transaction Gateway for Desktop Edition are affected by POODLE.
Vulnerability Details
CVE ID: CVE-2014-3566
DESCRIPTION: IBM CICS Transaction Gateway could allow a remote attacker to obtain sensitive information, caused by a design error when using the SSLv3 protocol. A remote user with the ability to conduct a man-in-the-middle attack could exploit this vulnerability by using a POODLE (Padding Oracle On Downgraded Legacy Encryption) attack to decrypt SSL sessions and access the plaintext of encrypted connections.
CVSS Base Score: 4.3
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/97013 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:M/Au:N/C:P/I:N/A:N)
Back level CICS TG provided JARs and resource adapters are allowed to connect to CICS TG using SSLv3. All supported versions of the CICS TG provided JARs and resource adapters connect to CICS TG using TLS.
At CICS TG V9.1 the https listener will allow SSLv3 connections. This vulnerability can be closed by configuring CICS TG to use releases of Java documented in the Java security bulletin:
http://www-01.ibm.com/support/docview.wss?uid=swg21688165
Information on updated JREs, containing the Java fix for CVE-2014-3566, for use with CICS TG can be found in the following security bulletin:
http://www.ibm.com/support/docview.wss?uid=swg21692589
Affected Products and Versions
Supported versions of CICS TG for Mutliplatforms and CICS TG Desktop Edition
Workarounds and Mitigations
Upgrade unsupported back-level CICS TG client applications to use supported versions of the CICS TG provided JARs or resource adapters.
From CICS TG V9.0, TLSv1.2 connections can be required by specifying SP800-131A strict compliance using Java system property:
com.ibm.jsse2.sp800-131=strict
Specifying SP800-131A transition compliance requires TLSv1.0 connections:
com.ibm.jsse2.sp800-131=transition
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Important Note
IBM strongly suggests that all System z customers be subscribed to the System z Security Portal to receive the latest critical System z security and integrity service. If you are not subscribed, see the instructions on the System z Security web site. Security and integrity APARs and associated fixes will be posted to this portal. IBM suggests reviewing the CVSS scores and applying all security or integrity fixes as soon as possible to minimize any potential risk.
References
*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
Review the IBM security bulletin disclaimer and definitions regarding your responsibilities for assessing potential impact of security vulnerabilities to your environment.
Internal Use Only
Important note
IBM strongly suggests that all System z customers be subscribed to the System z Security Portal to receive the latest critical System z security and integrity service. If you are not subscribed, see the instructions on the System z Security web site. Security and integrity APARs and associated fixes will be posted to this portal. IBM suggests reviewing the CVSS scores and applying all security or integrity fixes as soon as possible to minimize any potential risk.
Product Synonym
CICSTG CTG CICS TG
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Document Information
Modified date:
21 June 2018
UID
swg21687697