Selenium Grid Exposure Scanner

Selenium Grid is a tool used primarily for automating browser testing. It allows for running tests in parallel on multiple machines, improving speed and coverage. Web developers and testers widely use Selenium Grid across various industries for improving the efficiency of their testing cycles. Its purpose is to enable automated cross-browser testing, which significantly enhances the robustness of web applications. Selenium Grid is part of the Selenium suite, which includes a range of tools for automating web browsers. By distributing scripts to different machines, it reduces the time taken for test execution.

When unconfigured properly, Selenium Grid can expose sensitive information, such as internal network IPs and system configurations. This vulnerability allows attackers to perform internal reconnaissance, SSRF attacks, or even hijack resources. The exposure of Selenium Grid can lead to sensitive information leaks, such as operational system details and software versions. Detecting this vulnerability is crucial for preventing unauthorized access to browser node configurations. Security measures must be implemented to restrict access to Selenium Grid consoles.

The vulnerability arises when the Selenium Grid console is exposed without authentication. Attackers can access the '/wd/hub/status' endpoint and fetch information regarding the system. The endpoint, when improperly configured, provides details such as browser names, availability, and slot configurations. These configurations should only be accessible to authenticated users to prevent misuse. The open access to these endpoints can allow attackers to gather valuable data that can be used for subsequent attacks. Controlling access to Selenium Grid endpoints is imperative to mitigating this vulnerability.

If exploited, this vulnerability can lead to serious security risks, such as unauthorized access to network data. Attackers could potentially launch SSRF attacks, accessing internal network resources. The risk of malicious reconnaissance increases, as attackers could map out network configurations and vulnerabilities. Resource hijacking is another possible effect, where attackers misuse browser nodes or deploy malicious tests. Such exploitation could disrupt regular operations and lead to data breaches, emphasizing the importance of securing Selenium Grid instances.

REFERENCES

• https://www.selenium.dev/documentation/grid/
• https://github.com/SeleniumHQ/selenium