Security Bulletin: Vulnerability in MD5 Signature and Hash Algorithm affects RIT and RTCP in Rational Test Workbench, RTCP and RIT Agent in Rational Test Virtualization Server, and RIT Agent in Rational Performance Test Server (CVE-2015-7575)

Created by Neeta Patke on Mon, 01/18/2016 - 06:28

Security Bulletin

Summary

The MD5 “SLOTH” vulnerability on TLS 1.2 affects Rational Integration Tester and Rational Test Control Panel in Rational Test Workbench, Rational Test Control Panel and RIT Agent in Rational Test Virtualization Server, and RIT Agent in Rational Performance Test Server

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

Rational Integration Tester component in Rational Test Workbench, Rational Test Control Panel component in Rational Test Workbench and Rational Test Virtualization Server, and RIT Agent in Rational Test Virtualization Server and Rational Performance Test Server versions:

All versions from 8.0 up to and including 8.7.1.1

Remediation/Fixes

The fixes for the CVE(s) mentioned above have been incorporated into an interim fix available on IBM Fix Central. Prior to patching, you should ensure that you have the latest fix pack installed for your supported version.

Upgrade your installation as follows:

Download the interim fix entitled 'Rational-RTW-SLOTH-MD5.zip', 'Rational-RTVS-SLOTH-MD5.zip' or 'Rational-RPTS-SLOTH-MD5.zip' and unzip the contents into a temporary directory
Locate the sub-directory from within the extracted zip relevant to your version of the product (the sub-directories are named by version)
Exit Rational Integration Tester if it is open and stop Rational Test Control Panel, agents and proxies if they are running
Copy the java.security file from within the appropriate sub-directory located in step (2) into the following product install locations:

RationalIntegrationTester/jre/lib/security
RationalTestControlPanel/jre/lib/security
RIT-Agent/jre/lib/security
RIT-Platform/jre/lib/security (only for versions earlier than 8.7)
Note the default install location is C:\Program Files\IBM (Windows), /opt/IBM (AIX / Linux / Solaris) or /Applications/IBM/ (OSX - for versions 8.7.1.0 and 8.7.1.1)

Restart the products

Notes:

When updating an installation to a later version, the security fix detailed above will have to be re-applied after the update
You should verify applying this fix does not cause any compatibility issues. The fix disables MD5 signature hash by default. If you change the default setting after applying the fix, you 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.
For the unsupported version 5.4.0, IBM recommends upgrading to a fixed, supported version of the product.

Workarounds and Mitigations

None

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References

Complete CVSS v2 Guide
On-line Calculator v2

Complete CVSS v3 Guide
On-line Calculator v3

Off

Acknowledgement

Reported to IBM by Karthikeyan Bhargavan at INRIA in Paris, France

Change History

<27 January 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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Tips

Security Bulletin: Vulnerability in MD5 Signature and Hash Algorithm affects RIT and RTCP in Rational Test Workbench, RTCP and RIT Agent in Rational Test Virtualization Server, and RIT Agent in Rational Performance Test Server (CVE-2015-7575)