Grubhub Assets Content-Security-Policy Bypass Scanner

The Grubhub Assets Scanner is used by security professionals to detect potential Content-Security-Policy (CSP) bypass vulnerabilities within web applications, particularly those utilizing Grubhub assets. This scanner operates in environments where web security and compliance are critical, such as in the financial and e-commerce sectors where user data protection is paramount. Its primary users include penetration testers, application security engineers, and system administrators. These stakeholders leverage the scanner to ensure that web applications are shielded from CSP bypass attempts that could lead to unauthorized script execution. It is particularly useful in identifying scenarios where improvident CSP implementations allow for cross-site scripting (XSS) vulnerabilities. By utilizing the scanner, organizations aim to strengthen their security posture and comply with industry standards for web application security.

The vulnerability detected by the scanner is related to the bypassing of Content-Security-Policies, which are intended to prevent the execution of unauthorized scripts in the context of web applications. When CSPs are improperly implemented, they fail to provide comprehensive protection against XSS attacks. The scanner identifies instances where CSPs can be violated, potentially allowing attackers to execute malicious scripts that hijack user sessions or deface websites. The identified vulnerabilities are crucial in the prevention of XSS, as bypassing CSP can lead to significant data breaches. CSP bypass vulnerabilities are a constant concern for web administrators as they directly impact the security of web assets by facilitating unauthorized script execution. The detection and remediation of these vulnerabilities are fundamental to maintaining a secure web environment.

The scanner technically inspects for the presence of a Content-Security-Policy header within the HTTP responses of web applications incorporating Grubhub assets. It executes payloads to test whether the CSP implementation in place is robust against injection attacks, specifically those that leverage AngularJS. The core testing involves injecting scripts into the response headers and tracking if these scripts can be executed despite the CSP. The vulnerability is usually located in the CSP configuration which might implicitly or explicitly trust certain sources without robust validation. In the context of the Grubhub assets, the vulnerability might manifest when CSP policies are too permissive or misconfigured, allowing AngularJS resources to be exploited. Additionally, the scanner checks for specific CSP directives that could permit the adoption of scripts from unwanted sources.

Exploiting a CSP bypass vulnerability could lead to severe consequences, such as the execution of unauthorized scripts via XSS attacks. When successful, attackers may gain access to sensitive user information, such as session cookies which could be used to impersonate legitimate users. This could lead to unauthorized account access, manipulation of content, or defacement of web pages. In a business context, such vulnerabilities could also result in a significant loss of customer trust and potential legal repercussions from data protection violations. Additionally, the exploitation of these vulnerabilities might provide a gateway for further attacks against other systems within the network. The overall impact could extend beyond individual data breaches to widespread network compromises, particularly if the organization is dependent on vulnerable web applications for critical operations.

REFERENCES

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