The security update addresses the vulnerability by changing how IIS handles requests when specific IP and domain restriction configurations exist.
For more information about the vulnerability, see the Frequently Asked Questions FAQ subsection for the specific vulnerability. For more information about this document, see Microsoft Knowledge Base Article The following software has been tested to determine which versions or editions are affected.
Other versions or editions either are past their support life cycle or are not affected. To determine the support life cycle for your software version or edition, see Microsoft Support Lifecycle.
The following severity ratings assume the potential maximum impact of the vulnerability. Mitigation refers to a setting, common configuration, or general best-practice, existing in a default state, that could reduce the severity of exploitation of a vulnerability.
The following mitigating factors may be helpful in your situation:. Workaround refers to a setting or configuration change that does not correct the underlying vulnerability but would help block known attack vectors before you apply the update. Microsoft has tested the following workarounds and states in the discussion whether a workaround reduces functionality:. Disable the domain computer accountsassociated with revoked client certificates. For instructions on using a script to disable multiple computer accounts, see Disable Computer Accounts.
What is the scope of the vulnerability? This is a security feature bypass vulnerability. What causes the vulnerability? The vulnerability is caused when Windows fails to properly check the validity of certificates. What is the component that is affected by this vulnerability? It is commonly used in Microsoft DirectAccess deployments. What is DirectAccess? For more information, see DirectAccess. What might an attacker use the vulnerability to do? An attacker who successfully exploited this vulnerability could bypass a security feature that relies on the validity of certificates.
How could an attacker exploit the vulnerability? The vulnerability could allow security feature bypass if an attacker presents a revoked certificate to an application or service that uses the IP-HTTPS component.
What systems are primarily at risk from the vulnerability? Servers are at risk from this vulnerability. What does the update do? The update fixes the vulnerability by modifying how Microsoft Windows checks the validity of certificates. When this security bulletin was issued, had this vulnerability been publicly disclosed? Microsoft received information about this vulnerability through coordinated vulnerability disclosure.
When this security bulletin was issued, had Microsoft received any reports that this vulnerability was being exploited? Microsoft had not received any information to indicate that this vulnerability had been publicly used to attack customers when this security bulletin was originally issued. Manage the software and security updates you need to deploy to the servers, desktop, and mobile systems in your organization.
The Microsoft TechNet Security website provides additional information about security in Microsoft products. Security updates are available from Microsoft Update and Windows Update. Security updates are also available from the Microsoft Download Center. You can find them most easily by doing a keyword search for "security update.
Finally, security updates can be downloaded from the Microsoft Update Catalog. The Microsoft Update Catalog provides a searchable catalog of content made available through Windows Update and Microsoft Update, including security updates, drivers and service packs. By searching using the security bulletin number such as, "MS" , you can add all the applicable updates to your basket including different languages for an update , and download to the folder of your choosing.
Microsoft provides detection and deployment guidance for security updates. This guidance contains recommendations and information that can help IT professionals understand how to use various tools for detection and deployment of security updates. 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.
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