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Security Bulletin: Vulnerability in Diffie-Helman ciphers affects IBM License Metric Tool and IBM Endpoint Manager for Software Use Analysis (CVE-2015-4000)

Security Bulletin


Summary

The LogJam Attack on Diffie-Hellman ciphers affects IBM License Metric Tool and IBM Endpoint Manager for Software Use Analysis.

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 License Metric Tool v9

IBM Endpoint Manager for Software Use Analysis v9

Remediation/Fixes

Upgrade to version 9.2.1.0 or newer.

In order to upgrade to version 9.2.1.0 or newer:

  • In IBM Endpoint Manager console, expand IBM License Reporting or IBM BigFix Inventory node under Sites node in the tree panel.
  • Click Fixlets and Tasks node. Fixlets and Tasks panel will be displayed on the right.
  • In the Fixlets and Tasks panel locate Upgrade to the newest version of License Metric Tool 9.x or Upgrade to the newest version of IBM BigFix Inventory 9.x fixlet and run it against the computer that hosts your IBM License Metric Tool or IBM Endpoint Manager for Software Use Analysis server.

Note: In an airgapped environment, you have to run BESAirgapTool and BESDownloadCacher first in order to update your site.

Workarounds and Mitigations

In order to mitigate the vulnerability, limit the available ciphersuites using the following procedure:

  1. Stop the server
  2. Locate and edit server's server.xml file. It is located in <server_installation_dir>\wlp\usr\servers\server1.
  3. Add the following attribute to ssl stanza:


enabledCiphers="TLS_RSA_WITH_AES_128_CBC_SHA SSL_RSA_WITH_RC4_128_SHA SSL_RSA_WITH_RC4_128_MD5 TLS_RSA_WITH_AES_128_GCM_SHA256
TLS_RSA_WITH_AES_128_CBC_SHA256 SSL_RSA_WITH_3DES_EDE_CBC_SHA TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256 TLS_ECDHE_RSA_WITH_AES_
128_CBC_SHA256 TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256"

Your ssl stanza may look similar to the following after the change:


<ssl clientAuthenticationSupported='false' id='defaultSSLConfig' keyStoreRef='defaultKeyStore'
enabledCiphers="TLS_RSA_WITH_AES_128_CBC_SHA SSL_RSA_WITH_RC4_128_SHA SSL_RSA_WITH_RC4_128_MD5 TLS_RSA_WITH_AES_128_GCM_SHA256
TLS_RSA_WITH_AES_128_CBC_SHA256 SSL_RSA_WITH_3DES_EDE_CBC_SHA TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256 TLS_ECDHE_RSA_WITH_AES_
128_CBC_SHA256 TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256"/>

4. Save the file and restart the server.

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References

Related information

*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

According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.


Cross reference information
Segment Product Component Platform Version Edition
Systems and Asset Management IBM Endpoint Manager for Software Use Analysis

Document information

More support for: IBM License Metric Tool

Software version: 9.0, 9.0.1, 9.1, 9.2

Operating system(s): Linux, Windows

Reference #: 1959453

Modified date: 10 June 2015


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