Security Bulletin
Summary
There are multiple vulnerabilities in IBM® SDK Java™ Technology Edition, Version 6 that is used by Rational Method Composer. These issues were disclosed as part of the IBM Java SDK updates in January 2016 and includes the vulnerability commonly referred to as “SLOTH”.
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.
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/S:U/C:H/I:L/A:N)
Affected Products and Versions
7.5.2.3 and earlier.
Remediation/Fixes
Prepare for the fix by upgrading to Rational Method Composer Fix Pack 3 (7.5.2.3) for 7.5.2
Prepare for the fix by upgrading to Rational Method Composer Fix Pack 2 (7.5.1.2) for 7.5.1.
Prepare for the fix by upgrading to Rational Method Composer Fix Pack 1 (7.5.0.1) for 7.5.
| Product | VRMF | APAR | Remediation |
| Rational Method Composer 7.5.2.2 | 7.5.2.3-ifix3 | None | 7.5.0.1.iFix4-7.5.1.2.iFix3-7.5.2.3.iFix3 |
| Rational Method Composer 7.5.1.2 | 7.5.1.2-ifix3 | None | 7.5.0.1.iFix4-7.5.1.2.iFix3-7.5.2.3.iFix3 |
| Rational Method Composer 7.5.0.1 | 7.5.0.1-ifix4 | None | 7.5.0.1.iFix4-7.5.1.2.iFix3-7.5.2.3.iFix3 |
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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References
Acknowledgement
CVE-2015-7575 was reported to IBM by Karthikeyan Bhargavan at INRIA in Paris, France
*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.
Product Synonym
Rational Method Composer
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Document Information
Modified date:
17 June 2018
UID
swg21975877