DoubleClick PubAds Content-Security-Policy Bypass Scanner

The DoubleClick PubAds Scanner is a specialized tool used to detect potential security vulnerabilities in web assets utilizing the DoubleClick PubAds service. This service is primarily used by digital advertisers and website owners to manage and deliver advertisements effectively. The scanner checks if the web assets are potentially vulnerable to Content-Security-Policy (CSP) Bypass attacks, often used to bypass security filters and deliver unauthorized content. It is widely employed in the digital marketing industry for monitoring advertising networks. Users of this service should regularly check for vulnerabilities to ensure the integrity and security of their web platform. Regular scanning helps in maintaining a secure advertising network by identifying and mitigating detected vulnerabilities.

The vulnerability identified by this scanner pertains to the possibility of bypassing the Content-Security-Policy in DoubleClick PubAds. A bypass in the Content-Security-Policy can lead to Cross-Site Scripting (XSS) attacks, where unauthorized scripts are executed on a web page. XSS vulnerabilities are critical as they allow attackers to inject malicious code that can compromise user data or redirect users to malicious sites. Detecting such vulnerabilities is crucial for maintaining the trustworthiness of the advertising network. The scanner detects these potential risks by analyzing the security headers and ensuring that they are not improperly configured. Identifying these issues helps with remediating the flaw and securing the digital assets.

The technical details of this vulnerability involve the improper configuration of Content-Security-Policy headers in DoubleClick PubAds. The scanner sends specific GET requests to detect CSP bypass by checking for certain payloads loaded via script tags from the ad server. It performs header inspection to identify patterns that suggest a potential XSS vulnerability. The payloads mimic typical malicious content to test if it gets executed on the client side without getting blocked. The scanner uses headless browser techniques to verify if injected scripts lead to any successful alert initiation. Matchers are employed to evaluate the presence of XSS via CSP bypass successfully. By detailing these mechanisms, the scanner offers precise detection capabilities to identify CSP bypasses efficiently.

When exploited, CSP bypass vulnerabilities can lead to significant security issues such as unauthorized data access and the execution of untrusted scripts. This can result in data theft, session hijacking, and identity theft for users of affected websites. Furthermore, these vulnerabilities could damage the reputation of digital advertisers by allowing malicious ads to run on their network. Users might also face phishing attacks, as attackers could redirect users to malicious links. Businesses may suffer financial losses due to potential legal actions from affected users, and there may be interruptions in service. Therefore, understanding and mitigating these risks is essential for maintaining a secure web presence.

REFERENCES

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