PBS URS Content-Security-Policy Bypass Scanner

PBS URS is primarily utilized by organizations involved in broadcasting and content distribution. It serves as a digital asset management system to streamline media content operations. The system is motivated by the need for efficient content delivery and secure management of digital assets. Users include broadcasters, digital content creators, and organizations that rely on multimedia distribution. Its features facilitate a centralized platform to handle extensive media libraries and related metadata. PBS URS's importance is underscored by its ability to optimize workflows and ensure secure content dissemination.

The vulnerability detected by this scanner is related to the bypass of Content-Security-Policy (CSP), which can lead to Cross-Site Scripting (XSS) attacks. CSP is intended to prevent such attacks by specifying trusted sources for web page assets, but bypasses can occur if improperly configured. XSS vulnerabilities allow attackers to inject malicious scripts into web pages viewed by other users. This malicious code can then execute arbitrary actions on behalf of users visiting the site. It's crucial to address these weaknesses as they can undermine the integrity of web applications.

The scanner identifies weaknesses in the Content-Security-Policy implementation in PBS URS. It focuses on detection through GET requests to the base URL and evaluates the response headers for CSP configurations. The vulnerability lies in headers where CSP allows script sources that can be exploited to execute unauthorized scripts. By using specific payloads capable of injecting scripts, the scanner tests the application’s resistance against potential XSS attacks. If successful, the exploitation mechanism leverages redirect functionalities that bypass existing CSP restrictions.

When malicious attackers exploit this vulnerability, they can perform unauthorized actions such as data theft, session hijacking, and manipulation of web page contents. It could render users vulnerable to phishing attacks or the spread of malware. The privilege escalation might occur, offering unauthorized access to sensitive data. Furthermore, the reputation of the affected organizations might suffer, and confidence in the digital platform could be shaken. Ensuring a robust CSP configuration is vital to prevent such exploitation.

REFERENCES

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