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Security Bulletin: Vulnerability in IBM Java Runtime affects TPF Toolkit (CVE-2015-7575)

Created by Igets Administrator on

Security Bulletin


Summary

There is a vulnerability in IBM® Runtime Environment Java™ Technology Edition, Version 7 that is used by TPF Toolkit. 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

TPF Toolkit 4.0.x, and 4.2.x

Remediation/Fixes

Product

VRMFAPARRemediation/First Fix
TPF Toolkit4.2.xJR55291
  1. Install the latest version of IBM Installation Manager.
  2. Apply Interim Fix 4.2.6 by using IBM Installation Manager.
  3. Update the Java installation on your z/OS or Linux on z Systems (or both) systems that the TPF Toolkit connects to. Download the latest version of Java from http://www.ibm.com/developerworks/java/jdk/
TPF Toolkit4.0.xJR55292
  1. Install the latest version of IBM Installation Manager.
  2. Apply Interim Fix 4.0.9 by using IBM Installation Manager.
  3. Update the Java installation on your z/OS or Linux on z Systems (or both) systems that the TPF Toolkit connects to. Download the latest version of Java from http://www.ibm.com/developerworks/java/jdk/

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 JDK is the only solution.

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References

Complete CVSS v2 Guide
On-line Calculator v2

Complete CVSS v3 Guide
On-line Calculator v3

Off

Related Information

IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog

Acknowledgement

CVE-2015-7575 was reported to IBM by Karthikeyan Bhargavan at INRIA in Paris, France

Change History

23 Feb 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

Review the IBM security bulletin disclaimer and definitions regarding your responsibilities for assessing potential impact of security vulnerabilities to your environment.

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Document Information

Modified date:
02 August 2018

UID

swg21976567

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