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AUSCERT External Security Bulletin Redistribution
ESB-2016.0480
Security Bulletin: Vulnerability in IBM Java Runtime affects
IBM WebSphere MQ (CVE-2015-7575)
24 February 2016
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AusCERT Security Bulletin Summary
---------------------------------
Product: IBM WebSphere MQ
Publisher: IBM
Operating System: AIX
HP-UX
Linux variants
Solaris
Windows
Impact/Access: Access Privileged Data -- Remote with User Interaction
Provide Misleading Information -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2015-7575
Reference: ASB-2016.0004
ESB-2016.0468
ESB-2016.0467
ESB-2016.0466
ESB-2016.0055
ESB-2016.0049
ESB-2016.0047
ESB-2016.0046
Original Bulletin:
http://www.ibm.com/support/docview.wss?uid=swg21977523
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Security Bulletin: Vulnerability in IBM Java Runtime affects IBM WebSphere MQ
(CVE-2015-7575)
Security Bulletin
Document information
More support for:
WebSphere MQ
Java
Software version:
7.1, 7.5, 8.0
Operating system(s):
AIX, HP-UX, Linux, Solaris, Windows
Software edition:
All Editions
Reference #:
1977523
Modified date:
2016-02-23
Summary
There is a vulnerability in IBM Runtime Environment Java Technology Edition,
Versions 6 & 7 that is used by IBM WebSphere MQ. This vulnerability, commonly
referred to as SLOTH, was disclosed as part of the IBM Java SDK updates in
January 2016.
Vulnerability Details
CVEID:
CVE-2015-7575
DESCRIPTION:
The TLS protocol could allow weaker than expected security caused by a
collision attack when using the MD5 hash function for signing a
ServerKeyExchange message during a TLS handshake. An attacker could exploit
this vulnerability using man-in-the-middle techniques to impersonate a TLS
server and obtain credentials. This vulnerability is commonly referred to as
SLOTH.
CVSS Base Score: 7.1
CVSS Temporal Score: See
https://exchange.xforce.ibmcloud.com/vulnerabilities/109415
for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/UI:U/C:H/I:L/A:N)
Affected Products and Versions
IBM JRE 7, Java Technology Edition, Version 7 provided by IBM WebSphere MQ
8.0.0.4 and earlier on all platforms (except IBM i and z/OS)
IBM JRE 6, Java Technology Edition, Version 6 provided by IBM WebSphere MQ
7.5.0.5, IBM WebSphere MQ 7.1.0.7 and earlier on all platforms (except IBM i
and z/OS)
Remediation/Fixes
IBM WebSphere MQ 8.0
HP-UX
Apply fix pack 8.0.0.5 when available, in the interim use the workaround
provided below
AIX, Linux, Solaris & Windows
Apply fix pack 8.0.0.5 when available, in the interim apply
ifix IT13492
IBM WebSphere MQ 7.5
Apply fix pack 7.5.0.6 when available, in the interim apply
ifix IT13492
IBM WebSphere MQ 7.1
Apply fix pack 7.1.0.8 when available, in the interim apply
ifix IT13492
Workarounds and Mitigations
For CVE-2015-7575:
Users of Java 7 and later can address the issue by updating the
../jre/lib/security/java.security file as follows (both steps are required):
Add MD5 to the jdk.certpath.disabledAlgorithms property - e.g.
jdk.certpath.disabledAlgorithms=MD2, RSA keySize < 1024,MD5
Add MD5withRSA to the jdk.tls.disabledAlgorithms property - e.g.
jdk.tls.disabledAlgorithms=SSLv3, RC4, DH keySize < 768,MD5withRSA
Java 6 requires code changes in the JSSE component in addition to the
java.security file modifications, so upgrading the JRE is the only solution.
Get Notified about Future Security Bulletins
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to be notified of important product support alerts like this.
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
Complete CVSS v3 Guide
On-line Calculator v3
Related information
IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog
IBM Java SDK Security Bulletin
Acknowledgement
CVE-2015-7575 was reported to IBM by Karthikeyan Bhargavan at INRIA in Paris,
France
Change History
24 February 2016: 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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