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Log4j 2 is a Java-based logging library that is widely used in business system development, included in various open-source libraries, and directly embedded in major software applications. The vulnerabilities, tracked as CVE-2021-44228 and CVE-2021-45046 and referred to as “Log4Shell,” affects Java-based applications that use Log4j 2 versions 2.0 through 2.15.0.

An application restart will be required for these changes to take effect.

Kubernetes administrators may use “kubectl set env” to set the LOG4J_FORMAT_MSG_NO_LOOKUPS=”true” environment variable to apply the mitigation across Kubernetes clusters where the Java applications are running Log4j 2.10 to 2.14.1, effectively reflecting on all pods and containers automatically.

Alternatively, customers using Log4j 2.10 to 2.14.1 may set the LOG4J_FORMAT_MSG_NO_LOOKUPS=”true” environment variable to force this change.

Ensure this parameter is configured in the startup scripts of the Java Virtual Machine:

In case the Log4j 2 vulnerable component cannot be updated, Log4j versions 2.10 to 2.14.1 support the parameter log4j2.formatMsgNoLookups to be set to ‘true’, to disable the vulnerable feature.

Microsoft advises customers to do an extensive search beyond log4j-core-*.jar files.

Log4j may also be present in other files as a bundle or as a shaded library.

$ zip -q -d log4j-core-*.jar org/apache/logging/log4j/core/lookup/JndiLookup.class

Customers can do this by deleting the class from affected JAR files.

For all releases of Log4j 2.x prior to 2.16.0, the most effective mitigation, besides a security update, is to prevent the JndiLookup.class file from being loaded in the applications’s classpath.

These workarounds should not be considered a complete solution to resolve these vulnerabilities:

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To help mitigate the risk of these vulnerabilities in Log4j 2.x until the more complete security update can be applied, customers should consider the following mitigations steps for all releases of Log4j 2.x – except releases 2.16.0 or later and 2.12.2.

Apache Announcement: Log4j 1.x End of Life.

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Systems running on Log4j 1.x are not impacted by these vulnerabilities. In 2015, Apache announced Log4j 1.x has reached end-of-life. Microsoft recommends customers to upgrade to Log4j 2.16.0 or later for the latest security updates. Systems that have already been updated to 2.15.0 should move to 2.16.0 or later as soon as possible for extra protection against other potential vulnerabilities described in CVE-2021-45046.

Java 7: update to Log4j 2.12.2 or later.

Java 8 or newer: update Log4j to 2.16.0 or later.

No Java version can mitigate these vulnerabilities. The recommended action is to update Apache Log4j 2. An application restart will be required.

Apache security advisory: Apache Log4j Security VulnerabilitiesĪll systems, including those that are not internet facing, are potentially vulnerable to these vulnerabilities, so backend systems and microservices should also be upgraded.

Please review the Apache CVEs and the Apache security advisory for further details: To address these vulnerabilities, Microsoft recommends customers apply the latest security updates. Information for Security Operations and Hunters Mitigation Guidance for Microsoft ServicesĪzure App Service (Windows and Linux and Containers)Īzure Application Gateway, Azure Front Door, and Azure WAF Links are provided to jump to the content below: To help customers protect themselves, we are also providing the following product specific guidance to help customers improve their security posture.

As we continue our investigation, we will notify affected parties if we identify any impact to customer data. If you are using any Microsoft services other than those explicitly listed in the CVE, no action is required by you at this time. Customers are encouraged to apply these updates as quickly as possible. Our security teams have been analyzing our products and services to identify and mitigate any instances of CVE-2021-44228 and CVE-2021-45046 in Apache Log4j 2.Īffected Microsoft products requiring customer action have been released in our Security Update Guide – CVE-2021-44228.

Currently, Microsoft is not aware of any impact, outside of the initial disclosure involving Minecraft: Java Edition, to the security of our enterprise services and has not experienced any degradation in availability of those services as a result of this vulnerability.

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Microsoft continues our analysis of the remote code execution vulnerabilities related to Apache Log4j (a logging tool used in many Java-based applications) disclosed on. Published on: 2021 Dec 11, updated 2021 Dec 18.