Security Bulletin: Multiple vulnerabilities in IBM Java Runtime affect Rational Directory Server (Tivoli) & Rational Directory Administrator

Summary

There are multiple vulnerabilities in IBM® Runtime Environment Java™ Version 7 and Version 8 used by Rational Directory Server (Tivoli) and Rational Directory Administrator. These issues were disclosed as part of the IBM Java SDK updates in July 2021. Upgrade the JRE in order to resolve these issues.

Vulnerability Details

CVEID:CVE-2021-2432
**DESCRIPTION:**An unspecified vulnerability in Java SE related to the JNDI component could allow an unauthenticated attacker to cause a denial of service resulting in a low availability impact using unknown attack vectors.
CVSS Base score: 3.7
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/205856 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L)

Affected Products and Versions

RDS

|

5.2.1 iFix 13 and earlier

RDA

|

1. 6.0.0.2 iFix 06 and earlier

2. 6.0.0.3

Remediation/Fixes

1. Download one of the following IBM JRE versions that contain the fixes for these vulnerabilities:

• IBM Java Runtime Environment, Version 7 R1 Service Refresh 4 Fix Pack 90
• IBM Java Runtime Environment, Version 8 Service Refresh 6 Fix Pack 35

** Note** : For Rational Directory Administrator-6.0.0.3, download JRE 8.x or later.

2. After downloading a fixed IBM JRE version, refer the following technote for JRE upgrade instructions:

• JRE Upgrade Instructions for Rational Directory Server (Tivoli) 5.2.1
  • JRE Upgrade Instructions for Rational Directory Administrator 6.0, 6.0.0.1 and 6.0.0.2
  • JRE Upgrade Instructions for Rational Directory Administrator 6.0.0.3

NOTE:

To improve the robustness of LDAPS (secure LDAP over TLS) connections, endpoint identification algorithms have been enabled by default. There may be situations where some applications that were previously able to successfully connect to an LDAPS server may no longer be able to do so.
With this LDAP update, LDAP is asking JSSE to validate the LDAP server’s certificate to ensure it is compliant with hostname verification. With this change, if the server’s certificate is not compliant, then exception will be thrown. In the past, LDAP did not request JSSE to perform hostname verification and a non-compliant server certificate would not have had caused an issue.
In order to resolve the issue, Regenerate the RDS server certificate(tdsserverkey.kdb) so that the certificate’s subject name or certificate’s subject alternate name matches the RDS server hostname, by following instructions from technote:

How can I generate my own ‘tdsserverkey.kdb’ keystore for TLSv12 communication and use it in a IBM Rational Directory Server (Tivoli) deployment?

After regenerating the RDS Server certificate matching with the RDS Server Hostname, use FQDN’s wherever applicable.
E.g. : RDA Login Screen, Creating RDS Partition and DOORS to RDS Connection.

(If you have already regenerated the RDS Server certificate by following above technote, while upgrading to IBM JRE versions 7.1.4.30 or later or 8.0.5.20 or later, then no need to follow the technote again)

For versions of Rational Directory Server that are earlier than version 5.2.1, and Rational Directory Administrator versions earlier than 6.0.0.2, IBM recommends upgrading to a fixed, supported version/release/platform of the product.

If you run your own Java code using the IBM Java Runtime delivered with this product, you should evaluate your code to determine whether additional Java vulnerabilities are applicable to your code. For a complete list of vulnerabilities, refer to the “IBM Java SDK Security Bulletin”, located in the References section for more information.

Workarounds and Mitigations

None