Criteo Dynamic Content-Security-Policy Bypass Scanner

Criteo Dynamic is a technology leveraged by digital marketers to enhance their advertising strategies through dynamic ad content. This platform is primarily used by businesses to optimize and personalize the advertisement experience for customers. The intention is to display relevant ads that align with the users' preferences and behaviors, leading to improved engagement and conversion rates. Major retailers and brands integrate Criteo Dynamic into their marketing efforts to achieve higher sales and maintain customer loyalty. Given its impact on sales, maintaining the integrity and security of this platform is vital. Marketers and IT specialists use it to track and analyze ad performance metrics for strategic decisions.

The vulnerability detected pertains to a bypass in the Content-Security-Policy (CSP) within the Criteo Dynamic ecosystem. CSP is essential for protecting web applications against Cross-Site Scripting (XSS) attacks. A bypass in CSP could potentially allow an attacker to execute malicious scripts in a user's browser or inject unauthorized content. This could result in compromised sensitive information, such as user credentials or personal data, and disrupt the intended user experience. In essence, exploiting this vulnerability could lead to unauthorized access and manipulation of web content. Businesses using Criteo Dynamic might face serious security threats if this vulnerability is not addressed.

The technical detail of this vulnerability involves a bypass of the CSP header, which is meant to dictate the security policy for the web content that browsers are allowed to execute. The vulnerable endpoint in question is associated with the primary URL that hosts the dynamic content script. Parameters susceptible to exploitation are those injected into the URL, specifically the script parameter targeting dynamic JavaScript files from Criteo. When the CSP is bypassed, it fails to restrict scripts from untrusted sources, allowing an adversary to embed malicious scripts. This vulnerability further allows for potential automated execution of such scripts through fuzzing techniques, increasing the risk associated with it.

If malicious actors exploit this vulnerability, the consequences can be severe. They could gain unauthorized access to sensitive information, modify displayed ads, or redirect users to malicious websites. Such attacks might diminish user trust, lead to data breaches, and result in financial losses for affected businesses. Furthermore, exploitation can result in administrative control over user systems, potentially causing widespread harm not only to individual users but also to the businesses relying on Criteo Dynamic. Legal repercussions might also follow if data protection regulations are compromised due to such vulnerabilities.

REFERENCES

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