Security Bulletin
Summary
There is a vulnerability in IBM® Runtime Environment Java™ Technology Edition, Version 7R1 Service Refresh 3 Fix Pack 1 and earlier releases that is used by IBM MQ Light. 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.
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
The vulnerability affects users of IBM MQ Light V1.0, V1.0.1 and V1.0.2 on all platforms.
Remediation/Fixes
Download and install the appropriate MQ Light Server for your platform as shown below:
| Platform | License Type | APAR | Remediation/Fix |
| Windows | Developer | IT13531 | Interim fix for IT13531 (MQ Light Developer on Windows) |
| Windows | Production | IT13531 | Interim fix for IT13531 (MQ Light Production on Windows) |
| Linux | Developer | IT13531 | Interim fix for IT13531 (MQ Light Developer on Linux) |
| Linux | Production | IT13531 | Interim fix for IT13531 (MQ Light Production on Linux) |
| Mac | Developer | IT13531 | Interim fix for IT13531 (MQ Light Developer on Mac) |
The following link describes how to re-use the data from your existing installation:
http://www.ibm.com/support/knowledgecenter/SSBJCR_1.0.0/com.ibm.mq.koa.doc/tmql_data.htm
Workarounds and Mitigations
Edit the following file:
Windows - <installation directory>\runtime\java\jre\lib\security\java.security
Linux - <installation directory>/runtime/java/jre64/jre/lib/security/java.security
Mac - <installation directory>/runtime/java/jre64/Contents/Home/lib/security/java.security
Add MD5 to the jdk.certpath.disabledAlgorithms property. For example:
jdk.certpath.disabledAlgorithms=MD2, RSA keySize < 1024, MD5
Add MD5withRSA to the jdk.tls.disabledAlgorithms property. For example:
jdk.tls.disabledAlgorithms=SSLv3, RC4, DH keySize < 768, MD5withRSA
The MQ Light Server will need to be restarted for the changes to take effect.
Get Notified about Future Security Bulletins
References
Acknowledgement
CVE-2015-7575 was reported to IBM by Karthikeyan Bhargavan at INRIA in Paris, France
Change History
9 Feb 2016: Original version published
14 April 2016: Documented updated with link to fix
*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.
Was this topic helpful?
Document Information
Modified date:
15 June 2018
UID
swg21976341