FWM RM Content-Security-Policy Bypass Scanner

Content-Security-Policy Bypass - FWM RM Scanner is utilized by security professionals and organizations to identify potential vulnerabilities related to CSP bypass. It is particularly used in web environments where CSP headers are in place to protect against script-based attacks. The primary goal of this scanner is to ensure that these security policies are not being circumvented by malicious payloads. Organizations use this tool to maintain the integrity and security of their web applications and services. It aids in identifying loopholes that could be exploited in order to perform unauthorized actions on a website. By ensuring CSP compliance, the scanner helps maintain robust security postures in dynamic web environments.

The vulnerability detected by the scanner is Cross-Site Scripting (XSS), a common security issue where malicious scripts can be injected into trusted websites. This kind of vulnerability can occur when a web application includes untrusted data in a web page sent to users without proper validation or escaping. CSP bypass takes place when the security policies defined by Content-Security-Policy headers are inadequately implemented or enforced. Such vulnerabilities can allow attackers to execute malicious scripts in the context of the user's browser. The goal of detecting such vulnerabilities is to prevent potential breaches and data theft through script injections. This scanner aids in identifying if the current CSP policies are robust enough to prevent such XSS attempts.

Technical details about the vulnerability reveal that specific headers and scripts are targeted to assess the policy enforcement. In this scenario, the vulnerable endpoint involves analyzing the 'Content-Security-Policy' header and testing payloads such as script injections. The presence of specific conditions, such as keywords and expressions in the headers, weaken the CSP, making it susceptible to bypass attempts. The scanner simulates payloads that could be injected to test if CSP bypass is feasible. The template uses headless browsing to determine whether security dialogs are triggered, confirming the presence of a vulnerability. By tracking header interactions and analyzing script behaviors, the end-point resilience level is evaluated.

If a CSP bypass is successfully exploited, the effects could include unauthorized execution of scripts leading to data theft, user session hijacking, and defacement of web pages. Attackers may exploit this to carry out phishing campaigns or introduce malware into user sessions. The exploitation of this vulnerability could degrade the trust in a web service, leading to reputational damage for the impacted organization. Sensitive user data could be exposed, compromising privacy and potentially leading to regulatory penalties. Malicious actors could gain escalated privileges, enabling them to manipulate or control backend services or data unauthorisedly.

REFERENCES

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