Google APIs Content-Security-Policy Bypass Scanner

Google APIs are widely used in various applications across industries, providing functionalities such as authentication, data access, and more. Developers integrate these APIs to enhance user experiences and streamline processes. However, incorrect implementation or oversight regarding security policies like CSP can lead to vulnerabilities. As digital assets expand, maintaining the security of integrated third-party services becomes crucial. Security professionals and developers alike must be vigilant in ensuring external APIs do not introduce risks.

Cross-Site Scripting (XSS) vulnerabilities occur when untrusted data is included in web pages without proper validation. This scanner detects instances where the Content-Security-Policy (CSP) can be bypassed using Google APIs, potentially allowing malicious scripts to run. Such vulnerabilities can be exploited to execute scripts in a user's browser, leading to unauthorized actions and data theft.

The vulnerability is detected by analyzing headers for CSP directives and identifying payloads that can bypass these restrictions through Google APIs. Technical specifics include using injected scripts hosted on googleapis.com to manipulate page content. Detection involves checking for successful execution of injected scripts simulating an attack scenario.

If exploited, this vulnerability can result in sensitive user information being exposed or manipulated. Attackers could execute unauthorized actions on behalf of users or steal session tokens, leading to account compromise. Organizations may suffer brand damage, financial loss, and legal repercussions.

REFERENCES

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