Security Bulletin
Summary
We have identified that the IBM Kenexa LCMS Premier is affected by one or more security vulnerabilities. These have been tested in LCMS Premier 13.x & 14.0 versions.
Vulnerability Details
CVEID: CVE-2021-4104
DESCRIPTION: Apache Log4j could allow a remote attacker to execute arbitrary code on the system, caused by the deserialization of untrusted data when the attacker has write access to the Log4j configuration. If the deployed application is configured to use JMSAppender, an attacker could exploit this vulnerability to execute arbitrary code on the system.
CVSS Base score: 8.1
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/215048 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)
Affected Products and Versions
| Affected Product(s) | Version(s) |
| IBM Kenexa LCMS Premier on premise | LCMS 14.0 and below |
Remediation/Fixes
LCMS uses Log4j 1.x version and fix for this issue has been tested on IBM LCMS 13.x & 14.0 versions
Steps to Download from Fix Central
- Log in to Fix Central (https://www-945.ibm.com/support/fixcentral/)
- Select "IBM Kenexa LCMS Premier” from the Product Selector dropdown
- Select "14.0" from the Installed version dropdown
- Select "Windows" from the Platform dropdown
- Click "Continue"
- Select "Browse for Fixes” and click "Continue"
Download log4jLcmsfix.zip and Extract the following 2 files:
- libreplace.exe
- log4j-core-2.15.0.jar
Steps to Follow:
Steps for deploying log4j fix:
1. Copy libreplace.exe and log4j-core-2.15.0.jar into a new directory, e.g. c:\log4jfix
2. Start a command-prompt as administrator
3. Change to new directory, e.g. cd /d c:\log4jfix
4. Stop all LCMS services
5. Execute command-line:
libreplace.exe "d:\lcms" log4j*.jar log4j-core-2.15.0.jar . CONFIRM
("d:\lcms" represents your LCMS directory)
6. Notice log messages that look like "log4j(etc).jar is now identical to log4j-core-2.15.0.jar"; this confirms that changes have been made properly
7. Start LCMS services
OPTIONAL - to rollback changes(if needed):
1. Stop all LCMS services
2. Find the .log file in e.g. c:\log4jfix
3. Find every line that starts with "UNDO:"
4. Execute the OS command from command-line, which follows "UNDO:"
5. Start LCMS services
Workarounds and Mitigations
None
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References
Change History
16 Dec 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:
17 December 2021
UID
ibm16527876