Security Bulletin: Vulnerability in MD5 Signature and Hash Algorithm affects Rational Service Tester (CVE-2015-7575)

Workarounds and Mitigations

Mitigating steps for Bouncy Castle:
1) Download the bouncy castle version 1.5.3 ( the jar can be downloaded here https://www.bouncycastle.org/download/jce-jdk13-154.jar ).
2) Locate the previous bouncy castle librarie delivered, this will be typically at the following path:
INSTALLATION_DIRECTORY/IBM_SHARED_PLUGINS/plugins/com.ibm.rational.ttt.common.models.core_plugin_version/lib/approvedbouncy
For example::
C:\Program Files\IBM\IBMIMSharedRPT8702\plugins\com.ibm.rational.ttt.common.models.core_8.5.210.v20150622_1524\lib\approvedbouncy
for RPT v8.7.0.2.
3) Rename the bouncy castle jar version 1.5.3 downloaded to the name of the previous delivered jar ( jce-jdk13-134.jar ).
4) Replace the old jar with the new one.

For Java disable support for MD5 and MD5with RSA. Mitigating steps involve editing the java.security file under the RPT product installation folder:
Update java.security file:
1) Add MD5 to jdk.certpath.disabledAlgorithms. For example,
certpath.disabledAlgorithms=MD2, RSA keySize < 1024,MD5
2) Add MD5withRSA to jdk.tls.disabledAlgorithms. For example,
jdk.tls.disabledAlgorithms=SSLv3, RC4, DH keySize < 768,MD5withRSA

You should verify applying this configuration change does not cause any compatibility issues. Not disabling the MD5 signature hash 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.