Extracting Information from Web Pages Using CSS

The article discusses a phenomenon known as 'blind CSS exfiltration', which is a technique used to attack web applications. It explains how attackers can exploit security vulnerabilities to steal data from services. In this type of attack, the attackers do not need direct access to specific data; instead, they infiltrate the application's environment through malicious CSS code. The authors discuss various defense methods, such as Content Security Policy (CSP), which can be employed to secure applications against such attacks. They also provide practical examples and demonstrations of the attacks, allowing for a better understanding of the potential risks involved. The article concludes with insights and recommendations for developers on improving the security of their web applications.