FQTag Query Content-Security-Policy Bypass Scanner

FQTag Query is commonly used by web developers and security researchers to test the security policies in place in web applications, specifically focusing on content security policy (CSP) implementations. This tool is deployed in environments where web applications may be susceptible to script injection vulnerabilities. It helps ensure that applications have robust defenses against script-based threats. The tool checks for security policy compliance in web applications, particularly those using various CSP settings. It's often utilized in security testing scenarios to validate the effectiveness of security controls against XSS threats.

The vulnerability detected by this scanner is a potential bypass of content security policies, which can lead to Cross-Site Scripting attacks. It aims to identify situations where CSPs might be weak or misconfigured, allowing attackers to inject malicious scripts into web pages. The scanner focuses on detecting discrepancies in CSP settings and potential exploitation of them by malicious payloads. Proper content security policy configuration is vital to defending against such scripting attacks. The inability to enforce these policies properly can lead to untrusted script execution in users' browsers, compromising safety.

Technically, this scanner seeks vulnerabilities in CSP setups by employing script injections using the FQTag service and analyzing the outcomes. It performs GET requests to verify the presence and effectiveness of content security policies in headers. The payload injected is designed to produce a dialog box alert using JavaScript, which signals a potential weakness when it successfully executes. By employing headless scripting techniques, the scanner navigates web pages and evaluates script interactions. Potential vulnerability points include weak header implementations that could be bypassed by crafted queries. Detection of such loopholes can highlight areas lacking in script execution control.

When exploited, CSP bypass vulnerabilities can permit attackers to run unauthorized scripts on targeted web pages. This could potentially lead to a range of harmful actions, such as data theft, session hijacking, or unauthorized interactions with web applications. Compromised users may be exposed to phishing or redirection attacks without their consent or knowledge. The integrity and confidentiality of user data become at risk. Additionally, a successful attack could tarnish the reputation of the affected organization due to the perceived security lapse.

REFERENCES

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