Security Bulletin: Vulnerability in Diffie-Hellman ciphers affects IBM Tivoli Monitoring (CVE-2015-4000)

Summary

The Logjam vulnerability in TLS connections using the Diffie-Hellman (DH) key exchange protocol affects some components of IBM Tivoli Monitoring (ITM).

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

The following components of IBM Tivoli Monitoring (ITM) are affected by the LogJam vulnerability:
- Tivoli Enterprise Portal Server (TEPS)

- embedded WebSphere Application Server – ITM versions 6.2.0 through 6.3.0 FP5
- Portal Server Communication with Portal Clients when configured to use SSL over IIOP protocol - ITM versions 6.2.0 through 6.3.0 FP5 - Java (CANDLEHOME) - ITM Java-based agents using JSSE. - ITM versions 6.2.0 through 6.3.0 FP5

Remediation/Fixes

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Portal Server

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**embedded WebSphere Application Server:

For IBM Tivoli Monitoring 6.2.0 and 6.2.1, IBM recommends upgrading to a fixed, supported version/release of the product as listed above.

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**Portal Server Communication with Portal Clients:

Portal Server Communication with Portal Clients when configured to use SSL over IIOP protocol. SSL over IIOP is being used if both conditions below are true:
- HTTPS is not being used

- applet.html file does not have the tep.connection.protocol=http or https AND
- tep.jnlp file does not have tep.connection.protocol=https - the KFW_INTERFACE_cnps_SSL is set to “Y” in the portal server environment file (Windows: kfwenv, UNIX/Linux: cq.config)

For IBM Tivoli Monitoring 6.2.0 and 6.2.1, IBM recommends upgrading to a fixed, supported version/release of the product as listed above.

You should verify applying this fix does not cause any compatibility issues.

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Java (CANDLEHOME) Remediation:

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The IBM Tivoli Monitoring servers and base agents (those shipped as part of IBM Tivoli Monitoring Fix Packs) are not affected by this vulnerability. Only Java-based agents utilizing Java Secure Socket Extension (JSSE) which rely on the JRE in the IBM Tivoli Monitoring installation directory (for example, CANDLEHOME) can be affected. Agents affected will publish separate security bulletins and reference this bulletin for the remediation.

For systems where the affected agents are installed, the patch below should be installed which will update the shared Tivoli Enterprise-supplied JRE (jr component on UNIX/Linux) or Embedded JVM (JVM component on Windows). The technote Upgrading Shared Components for IBM Tivoli Monitoring Agents provides information on how shared libraries are used.

For IBM Tivoli Monitoring 6.2.0 and 6.2.1, IBM recommends upgrading to a fixed, supported version/release of the product as listed above.