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AUSCERT External Security Bulletin Redistribution
Security Bulletin: Vulnerability in IBM Java Runtime affects
Rational Publishing Engine (CVE-2015-7575)
10 March 2016
AusCERT Security Bulletin Summary
Product: IBM Rational Publishing Engine
Operating System: Linux variants
Impact/Access: Access Privileged Data -- Remote with User Interaction
Provide Misleading Information -- Remote with User Interaction
CVE Names: CVE-2015-7575
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Security Bulletin: Vulnerability in IBM Java Runtime affects Rational
Publishing Engine (CVE-2015-7575)
More support for:
Rational Publishing Engine
1.2, 188.8.131.52, 1.2.1, 184.108.40.206, 1.3, 2.0.0, 2.0.1
There is a vulnerability in IBM Runtime Environment Java Technology Edition,
Versions 6 and 7 that are used by Rational Publishing Engine. This
vulnerability, commonly referred to as SLOTH, was disclosed as part of the IBM
Java SDK updates in January 2016.
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
CVSS Base Score: 7.1
CVSS Temporal Score: See
https://exchange.xforce.ibmcloud.com/vulnerabilities/109415 for the current
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
Rational Publishing Engine 1.2.x
Rational Publishing Engine 1.3.0
Rational Publishing Engine 2.0.0
Rational Publishing Engine 2.0.1
For RPE 1.2.x:
For RPE 1.3.0, RPE 2.0.0 and RPE 2.0.1:
For RPE 1.1.x IBM recommends upgrading to a fixed, supported
version/release/platform of the product.
Workarounds and Mitigations
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 JDK is the only solution.
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IBM Product Security Incident Response Blog
CVE-2015-7575 was reported to IBM by Karthikeyan Bhargavan at INRIA in Paris,
*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.
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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