Security Bulletin: Vulnerability in Diffie-Hellman ciphers affects IBM InfoSphere Optim Performance Manager (CVE-2015-4000)

Summary

The Logjam Attack on TLS connections using the Diffie-Hellman (DH) key exchange protocol affects IBM InfoSphere Optim Performance Manager

Vulnerability Details

CVEID: CVE-2015-4000**
DESCRIPTION:** The TLS protocol could allow a remote attacker to obtain sensitive information, caused by the failure to properly convey a DHE_EXPORT ciphersuite choice. An attacker could exploit this vulnerability using man-in-the-middle techniques to force a downgrade to 512-bit export-grade cipher. Successful exploitation could allow an attacker to recover the session key as well as modify the contents of the traffic. This vulnerability is commonly referred to as “Logjam”.
CVSS Base Score: 4.3
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/103294 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:M/Au:N/C:P/I:N/A:N)

Affected Products and Versions

IBM Optim Performance Manager for DB2 on Linux, UNIX, and Windows version 4.1 through 4.1.1

IBM InfoSphere Optim Performance Manager for DB2 on Linux, UNIX, and Windows version 5.1 through 5.3.1

Remediation/Fixes

OPM version

| JRE Update URL
—|—
4.1 - 5.1.1.1| Replace JRE (V6 SR16-FP5 )
5.2 - 5.3.1| Replace JRE (V7 SR9-FP1) or see Workarounds and Mitigations below

Workarounds and Mitigations

For OPM 5.2 - 5.3.1 disable the DH and DHE cipher suites by adding “DH, DHE” to the list of disabled algorithms defined by the jdk.tls.disabledAlgorithms security property in java.security file.

Edit the java.security file that is located in the InfoSphere Optim Performance Manager installation directory:

/jre/lib/security/java.security

Add the following line and save the file:

jdk.tls.disabledAlgorithms=DH, DHE

If the jdk.tls.disabledAlgorithms property was already enabled (without a “#” character at the beginning of the line), i.e.:

jdk.tls.disabledAlgorithms=SSLv3

then append the text “, DH, DHE” to the end of the line and save the file.

jdk.tls.disabledAlgorithms=SSLv3``**, DH, DHE**

Restart the OPM Web Console server for this change to take effect.

You should verify applying this configuration change does not cause any compatibility issues. 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 Diffie-Hellman key-exchange protocol used in TLS and take appropriate mitigation and remediation actions.