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

2021-04-2916:10:08

www.ibm.com

ibm runtime environment java

ibm java sdk

rational directory server

rational directory administrator

stack-based buffer overflow

ldaps

endpoint identification.

EPSS

0.004

Percentile

74.6%

JSON

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 February 2021. Upgrade the JRE in order to resolve these issues.

Vulnerability Details

CVEID:CVE-2020-27221
**DESCRIPTION:**Eclipse OpenJ9 is vulnerable to a stack-based buffer overflow when the virtual machine or JNI natives are converting from UTF-8 characters to platform encoding. By sending an overly long string, a remote attacker could overflow a buffer and execute arbitrary code on the system or cause the application to crash.
CVSS Base score: 9.8
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/195353 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)

Affected Products and Versions

Affected Product(s)	Version(s)
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:

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:

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.