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CVE-2021-44228 - log4j vulnerability and DX OI RESTMon

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Article ID: 230535

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Updated On:

Products

DX Operational Intelligence DX OI SaaS

Issue/Introduction

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-44228

Apache Log4j2 <=2.14.1 JNDI features used in configuration, log messages, and parameters do not protect against attacker controlled LDAP and other JNDI related endpoints.

An attacker who can control log messages or log message parameters can execute arbitrary code loaded from LDAP servers when message lookup substitution is enabled 

From log4j 2.15.0, this behavior has been disabled by default. In previous releases (>2.10) this behavior can be mitigated by setting system property "log4j2.formatMsgNoLookups" to "true"; or adding the environment variable LOG4J_FORMAT_MSG_NO_LOOKUPS": "true" or by removing the JndiLookup class from the classpath (example: zip -q -d log4j-core-*.jar org/apache/logging/log4j/core/lookup/JndiLookup.class). Java 8u121 (see https://www.oracle.com/java/technologies/javase/8u121-relnotes.html) protects against remote code execution by defaulting "com.sun.jndi.rmi.object.trustURLCodebase" and "com.sun.jndi.cosnaming.object.trustURLCodebase" to "false" 

 

[Update 16 December] A further vulnerability (CVE-2021-45046) was disclosed on December 14th and it was found that the configuration mentioned in this KB to mitigate CVE-2021-44228 in Apache Log4j 2.x < 2.16.0 was incomplete in some scenarios.

Engineering is actively working on a permanent fix on top of 21.3.1 with the upgraded log4j 2.16 version.  

Environment

DX SaaS

DX OI SaaS

DX OI 21.3.1

RESTMon 2.1 and RESTMon 2.1.3 On-Premise

Resolution

Engineering analysis for the log4j vulnerability is in-progress. The fix will be available at a later date.

Meanwhile, you can mitigate the vulnerability by disabling JNDI lookups for log format messages.

To disable the JNDI lookups for log format messages, add the environment variable LOG4J_FORMAT_MSG_NO_LOOKUPS and set the value to true


If RESTMon is running in Kubernetes or Openshift environment, you can manually edit your deployment to add the environment variable.

After the environmental variable is set, you must restart the process or the container for the change to take effect.

For more information, see https://logging.apache.org/log4j/2.x/security.html

Additional Information

https://support.broadcom.com/security-advisory/content/security-advisories/Broadcom-Enterprise-Software-Security-Advisory-for-Log4j-2-CVE-2021-44228-Vulnerability/ESDSA19792