Once the custom error page CustError. The hacker has no idea of the actual technical error or internal coding details at this time. He is even unable to grab any kind of sensitive information such as earlier, because the web server load this page, no matter what the actual error is at the server side.
Hence, the ASP. NET uses View-State as a client-side state management mechanism for storing values of a web page during round tripping from the server. Once your web page code has finished running, ASP. NET examines all the controls on your page.
If any of these properties have been changed from its initial state, ASP. Finally, ASP. NET takes all the information it has combined and then serializes it as a Base64 string. The following example is just storing serial key values into page view-state for further reference. If an attacker inspects the HTML page source, he can find the following view-state information in the hidden field, such as: As in the previous figure, the value of the serial key stored in the view state is showing in Base64 hash format, that is indeed, not a big deal to crack.
Another mechanism is shown below, to decipher the Base64 hash format of view-state values. Just, copy the view state value in the hidden field from the earlier image and paste it into the following text box: Bingo!
We have successfully cracked the Base64 hash value. The hash value has been computed to the serial key as that is contained in the page view stated in encrypted form. So, hashing with Base64 or storing sensitive information in the view-state is quite dangerous, anyone could circumvent the web page data using their own custom decipher mechanism. In order to protect the view state data that contains highly sensitive data, such as session value, password or serial key, it is recommended to use the ViewStateEncryptionMode attribute in the HTML page that encrypts the view state data that makes the undertaking of the attacker harder.
Note , the aforesaid encoding scheme just hinders the path of the attacker but they are not fullproof to protect sensitive data. Not too readable. An attacker can easily circumvent the URL sensitive values that are passed in hashed format.
They can employee numerous conversion tools for UTF formats as in the following: However, the sensitive data was encoded in UTF-8 format. In fact, this URL sent the user name and password across the network and if you manage to derermine the encoding sache somehow then it would reveal the user name is Ajay and the password is phantom.
So encoding of obfuscation tactics makes it harder to recognize but is not the ultimate solution to protect data.
A developer might also use their own custom scheme to try to protect the data. The important point is that we should be aware of what the data is and how it is being consumed. NET 4.
If you installed. On the Summary of Features to Install page, confirm your selections, and then click Install. In the Add features that are required for ASP. The following additional features are added:. On the Installation progress page, confirm that your installation of the Web Server IIS role and required role services completed successfully, and then click Close. In the Windows Features dialog box, click Internet Information Services to install the default features.
The following additional features are automatically selected:. This section describes how to add your ASP. NET application to your website in the following ways:. In Plan an ASP. Right-click the site for which you want to create an application, and click Add Application. In the Alias text box, type a value for the application URL, such as marketing. This value is used to access the application in a URL.
Click Select if you want to select a different application pool than the one listed in the Application pool box. 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. Note : If an application in the VM uses Log4j, it may be susceptible to this vulnerability. Please follow mitigation guidance published here. Microsoft security teams have put together the following guidance and resources to help customers understand these vulnerabilities and to help detect and hunt for exploits:.
Added guidance for Java 7. Added guidance on Azure libraries for Java. Skip to content Published on: Dec 11, updated Dec
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