Google reCAPTCHA Content-Security-Policy Bypass Scanner

The Google reCAPTCHA security scanner is used by security professionals and developers to identify Content-Security-Policy (CSP) bypass vulnerabilities in digital assets. It helps organizations safeguard their websites and applications against security breaches by ensuring their reCAPTCHA implementations are secure. The scanner is primarily used in environments where Google reCAPTCHA is deployed to verify human users, protecting sites from spam and abuse. By using this scanner, organizations can detect vulnerabilities proactively and take necessary corrective actions. It is an essential tool for those concerned with application security and wanting to maintain robust security measures. The scanner provides valuable insights into potential security risks involving Google reCAPTCHA integration.

The vulnerability in question involves a Cross-Site Scripting (XSS) risk via a Content-Security-Policy bypass. This vulnerability can allow attackers to execute malicious scripts within the context of a trusted site. Such a vulnerability arises from weaknesses in the Content-Security-Policy implementation, enabling attackers to manipulate Google reCAPTCHA services. Understanding this vulnerability is crucial for ensuring that potential CSP bypass avenues are well-guarded. It underscores the importance of secure CSP configuration to prevent unauthorized script execution. Identifying such vulnerabilities helps in fortifying the overall site security against script-based attacks.

Technically, the vulnerability exploits the Content-Security-Policy headers that may not be properly configured to restrict script execution. The scanner navigates webpages to identify CSP headers on Google reCAPTCHA implementations that can be manipulated. By injecting specific scripts, it evaluates whether the reCAPTCHA service can be used as a vector for XSS attacks. The vulnerable endpoint often includes the web application’s entry pages utilizing Google reCAPTCHA. The scanner also analyzes query parameters to find injection points that malicious actors might exploit. Proper configuration of CSP settings is critical to mitigating this vulnerability and preventing potential script-based attacks.

Exploiting this vulnerability could lead to unauthorized script execution, thereby compromising the integrity of the affected web application. If an attacker successfully bypasses CSP using Google reCAPTCHA, they can potentially manipulate web content and execute arbitrary scripts. This poses risks such as data theft, unauthorized actions performed on behalf of legitimate users, and further exploitation of other site vulnerabilities. Users' trust might be jeopardized as their session data could be intercepted or manipulated. Consequently, exploiting this vulnerability could have significant security and reputational impacts on affected organizations. Organizations must prioritize mitigating such risks to maintain a secure web environment.

REFERENCES

• https://github.com/renniepak/CSPBypass/blob/main/data.tsv