Security Bulletin
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
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
- IBM Java Runtime Environment, Version 7 R1 Service Refresh 4 Fix Pack 80
- IBM Java Runtime Environment, Version 8 Service Refresh 6 Fix Pack 25
- 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
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
Get Notified about Future Security Bulletins
References
Change History
29 Apr 2021: Initial Publication
*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
Review the IBM security bulletin disclaimer and definitions regarding your responsibilities for assessing potential impact of security vulnerabilities to your environment.
Document Location
Worldwide
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Document Information
Modified date:
29 April 2021
UID
ibm16448464