Security Bulletin: Java specific SLOTH - Weak MD5 Signature Hash

Summary

There is vulnerability in IBM® Runtime Environment Java™ Technology Edition, Versions 6, 7, and 8, that are used by FileNet Content Manager, IBM Content Foundation and FileNet BPM. These issues were disclosed as part of the IBM Java SDK updates in January 2016 and include the vulnerability commonly referred to as “SLOTH”.

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. This vulnerability is commonly referred to as “SLOTH”.
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

FileNet Content Manager 5.1.0, 5.2.0, 5.2.1
IBM Content Foundation 5.2.0, 5.2.1
FileNet Business Process Manager 4.5.1, 5.0.0
FileNet eProcess 5.2.0

Remediation/Fixes

Install one of the fixes listed below to upgrade the Java JRE.
The fixes listed in the table below supply the proper Java JRE for the various release levels of the affected products. Depending upon the product and release level, these fixes will upgrade the Java JRE to one of:

• IBM JRE, Java Technology Edition, Version 6 Service Refresh 16 Fix Pack 20
• IBM JRE, Java Technology Edition, Version 7 Service Refresh 9 Fix Pack 30
• IBM JRE, Java Technology Edition, Version 8 Service Refresh 2 Fix Pack 10
  Product|VRMF|APAR|Remediation/First Fix
  —|—|—|—
  FileNet Content Manager| 5.1.0
  5.2.0
  5.2.1| PJ43917
  PJ43915
  PJ43915 | 5.1.0.0-P8CSS-IF015 - 2/23/2016
  5.2.0.4-P8CPE-IF003 - 2/23/2016
  5.2.1.3-P8CPE-IF001 - 2/23/2016
  IBM Content Foundation| 5.2.0
  5.2.1| PJ43915
  PJ43915| 5.2.0.4-P8CPE-IF003 - 2/23/2016
  5.2.1.3-P8CPE-IF001 - 2/23/2016
  FileNet Business Process Manager| 4.5.1
  5.0.0| PJ43908
  PJ43914| 4.5.1.4-P8PE-IF010 - 2/23/2016
  5.0.0.9-P8PE-IF003 - 2/23/2016
  FileNet eProcess| 5.2.0| PJ43916 | eProcess-5.2.0-001.008 - 2/23/2016

In the above table, the APAR links will provide more information about the fix.
The links in the Remediation column will take you to the location within IBM Fix Central where you can download the particular fix you need.

Workarounds and Mitigations

The new JREs that are supplied by the above fixes resolve the CVE-2015-7575 (SLOTH) vulnerability.
Note that CSS 5.1 uses Java 6 and has issued a patch.
CSS 5.2.0 and CSS 5.2.1 use Java 8 and are not issuing a patch at this time because the vulnerability can be eliminated as follows:

For CVE-2015-7575:

Users of Java 7 and later can address the issue by updating the /jre/lib/security/java.security file as follows (both steps are required):

· Add MD5 to the jdk.certpath.disabledAlgorithms property - e.g. jdk.certpath.disabledAlgorithms=MD2, RSA keySize < 1024, MD5

· Add MD5withRSA to the jdk.tls.disabledAlgorithms property - e.g. jdk.tls.disabledAlgorithms=SSLv3, RC4, DH keySize < 768, **MD5withRSA **

Note: If you install a Java fix pack, that will overwrite the above java.security file changes.