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AUSCERT External Security Bulletin Redistribution
ESB-2016.0668
Security Bulletin: "SLOTH" vulnerability in IBM Java SDK
affects InfoSphere Streams (CVE-2015-7575)
11 March 2016
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: IBM InfoSphere Streams
Publisher: IBM
Operating System: Linux variants
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-2016.0643
ESB-2016.0607
ESB-2016.0585
ESB-2016.0574
ESB-2016.0570
ESB-2016.0556
Original Bulletin:
http://www.ibm.com/support/docview.wss?uid=swg21977838
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Security Bulletin: "SLOTH" vulnerability in IBM Java SDK affects InfoSphere
Streams (CVE-2015-7575)
Document information
More support for:
IBM Streams
Software version:
1.2, 2.0, 3.0, 3.1, 3.2, 3.2.1, 4.0, 4.0.1, 4.1
Operating system(s):
Linux
Software edition:
All Editions
Reference #:
1977838
Modified date:
2016-03-10
Security Bulletin
Summary
There is a vulnerability in IBM SDK Java Technology Edition, Versions 7R1
Service Refresh 3 Fix Pack 1 and earlier releases and Version 8 Service
Refresh 1 Fix Pack 1 and earlier releases that is used by IBM InfoSphere
Streams. 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
1.2.1.0
2.0.0.4 and earlier
3.0.0.5 and earlier
3.1.0.7 and earlier
3.2.1.4 and earlier
4.0.1.1 and earlier
4.1
Remediation/Fixes
Java technology is used for SSL/TLS in InfoSphere Streams. The "SLOTH"
vulnerability in Streams can be corrected by applying the appropriate
remediation or upgrade documented below.
NOTE: Fix packs are available on IBM Fix Central.
Version 4.1. Take one of the following actions:
Perform the mitigation steps for Java referenced in the Workarounds and
Mitigations section below.
Upgrade to InfoSphere Streams Mod Release 4.1.1 (available on Passport
Advantage).
Version 4.0.1: Perform the mitigation steps for Java referenced in the
Workarounds and Mitigations section below.
Version 3.2.1: Perform the mitigation steps for Java referenced in the
Workarounds and Mitigations section below.
Version 3.1.0: Contact Technical Support.
Version 3.0.0: Contact Technical Support.
Versions 1.2 and 2.0: For version 1.x and 2.x IBM recommends upgrading to a
fixed, supported version/release/platform of the product. Customers who cannot
upgrade and need to secure their installation should open a PMR with IBM
Technical Support and request assistance securing their InfoSphere Streams
system against the vulnerabilities identified in this Security Bulletin.
IMPORTANT NOTE: If JAVA_HOME is set ensure it points to the install location
of the upgraded IBM Developer Kit, Java. Applications compiled with JAVA_HOME
set to a different location will need to be recompiled after JAVA_HOME has
been changed. For more information on compiling with JAVA_HOME set see the
Notes section on the page at this URL:
http://www-01.ibm.com/support/knowledgecenter/SSCRJU_4.0.0/com.ibm.streams.install.doc/doc/ibminfospherestreams-install-prerequisites-java-supported-sdks.html?lang=en
Workarounds and Mitigations
Customers using Streams versions 3.2.1, 4.0.1, or 4.1 should disable the use
of the MD5 hash by editing the java.security file and adding or updating the
entry for the jdk.certpath.disabledAlgorithms property with "MD5" and adding
or updating the entry for the jdk.tls.disabledAlgorithms property with
"MD5withRSA". If the documented mitigation for the "SLOTH" vulnerability has
previously been applied, the java.security file will have entries similar to:
jdk.certpath.disabledAlgorithms=MD2, RSA keySize < 1024, MD5
jdk.tls.disabledAlgorithms=SSLv3, RC4, DH keySize < 768, MD5withRSA
The java.security file is located in <STREAMS_INSTALL>/java/jre/lib/security.
Be certain that the line is not commented (does not begin with the "#"
symbol).
Restart all domains and instances for this change to take effect. You should
verify applying this configuration change does not cause any compatibility
issues. Not disabling the MD5 signature hash will expose yourself to the
attack described above.
IBM recommends that you review your entire environment to identify other areas
where you have enabled the MD5 signature hash and take appropriate mitigation
and remediation actions.
Get Notified about Future Security Bulletins
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alerts like this.
References
Complete CVSS v3 Guide
On-line Calculator v3
Related information
IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog
Change History
11 March 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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