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The vulnerabilities allow remote code execution by an unauthenticated attacker to gain complete access to a target system. It can be triggered when a specially crafted string is parsed and processed by the vulnerable Log4j 2 component. This could happen through any user provided input. Successful exploitation allows for arbitrary code execution in the targeted application.

Attackers do not need prior access to the system to log the string and can remotely cause the logging event by using commands like curl against a target system to log the malicious string in the application log. When processing the log, the vulnerable system reads the string and executes it, which in current attacks is used to execute the code from the malicious domain. Doing so can grant the attacker full access and control of the affected application.

Given the fact that logging code and functionalities in applications and services are typically designed to process a variety of external input data coming from upper layers and from many possible vectors, the biggest risk factor of these vulnerabilities is predicting whether an application has a viable attack vector path that will allow the malformed exploit string to reach the vulnerable Log4j 2 code and trigger the attack.

A common pattern of exploitation risk, for example, is a web application with code designed to process usernames, referrer, or user-agent strings in logs. These strings are provided as external input e. An attacker can send a malformed username or set user-agent with the crafted exploit string hoping that this external input will be processed at some point by the vulnerable Log4j 2 code and trigger code execution.

Figure 1. CVE and CE exploit vectors and attack chain. After further analysis of our services and products, below are a few mitigation strategies given by various Microsoft services. The mitigation based on disabling message lookup functionality — through enabling the system property log4j2. Customers should still apply the latest security updates or apply other documented mitigation steps such as the removal of the JndiLookup.

Microsoft recommends that all Customers upgrade to December release which has updated the Log4J library to 2. Azure Arc-enabled data services us Elasticsearch version 7. However, your applications may use Log4J and be susceptible to these vulnerabilities. If you are not able to re-package your application with a newer version of Log4j and you are using Log4j versions 2. Note that this command will also restart your App Service hosted application. In our investigation so far, we have not found any evidence that these services are vulnerable however customer applications running behind these services might be vulnerable to this exploit.

We highly recommend customers to follow mitigations and workarounds mentioned in this blog to protect their applications. Additional guidance for Azure WAF is located here.

Your instance may be vulnerable if you have installed an affected version of Log4j or have installed services that transitively depend on an affected version. For more information on checking for vulnerable Log4j 2 instances installed, please see the following Microsoft Document: Verify the version of Log4j on your cluster. Customers are recommended to apply the latest Log4j security updates and re-deploy applications. If you are not able to and you are using Log4j versions 2. Note that these application settings will restart your Function apps, and it will no longer use warm workers which will impact future cold-start performance.

All Azure HDInsight 5. Any HDI 4. For new clusters created using HDI 4. Jobs should only be executed after the patch has been applied and the impacted nodes have been rebooted to ensure that the vulnerability has been fixed. The patch should be run on each new cluster as a persisted script action until a new HDInsight image is available that incorporates the patch. Applications deployed to Azure Spring Cloud may use Log4j and be susceptible to this vulnerability.

Log4j usage may originate from:. Spring Boot applications are only affected if they have switched the default logging framework to Log4j 2. The log4j-to-slf4j and log4j-api jar files that are included in spring-boot-starter-logging cannot be exploited on their own. Only applications using log4j-core are vulnerable. If your application is impacted and you can redeploy the application, we recommend that you upgrade your application with the latest security updates for Log4j, and redeploy to Azure Spring Cloud — see more details at Log4j 2 vulnerability and Spring Boot.

If you are not able to re-deploy, you may mitigate impacted applications that are using Log4j 2. You can set the system property or environment variable using:. In the Azure Portal, navigate to your application in Azure Spring Cloud and change the configuration as illustrated below:. You can set the log4j2. Applications monitored by Application Insights or Dynatrace Java Agents do not carry any potential risk associated with the Log4j vulnerability. If you activated New Relic or AppDynamics Agents for your applications, we recommend that you restart your applications.

Azure Spring Cloud will take steps to automatically protect customers and auto-restart any application with activated New Relic or AppDynamics Java Agents by Tuesday, December 21 st , to ensure the latest fixes take effect. Cosmos DB SDKs do not have dependency on Log4j 2 and allow customers to independently bring their own logging technologies. If customers independently decide to use Log4j 2 they should ensure to use Log4j 2. Cosmos DB Spark Connector utilizes underlying spark offering logging technologies.

While the industry is determining and mitigating overall exposure, attackers are probing all endpoints for vulnerabilities. Applying rigorous least privilege access policies to all resources in your environment is critical. If you use Azure Active Directory for single-sign on in your environment, we recommend you do the following with a special focus on applications you deploy or manage directly SaaS apps, including those deployed by Microsoft, must be secured by their vendors.

Note that log4j2 usage may be pre-auth for some of your applications, but these steps will help prevent post-authentication exploitation. Templates and examples for these policies are built in to facilitate deployment:. Minecraft customers running their own servers are encouraged to deploy the latest Minecraft server update to protect their users.

When the updates are complete, you will need to re-boot one more time. Microsoft had to take down their virtual machine because of some legal issues. But you don't even have to use the Microsoft VM, you can use Sun Microsystem's version, and it seems to work just fine.

First, our system will check to see if automatic install works on your computer If so, the automatic process previewed here will begin. If not, you will see how to manually download and install , which is nearly as quick and easy as automatic installation.