Web caches play a crucial role in web performance and scalability. However, detecting cached responses is challenging when web servers …

OAuth 2.0 requires a complex redirection trail between websites and Identity Providers (IdPs). In particular, the “redirect …

Content Security Policy (CSP) is an effective security mechanism that prevents the exploitation of Cross-Site Scripting (XSS) …

Cross-Origin Resource Sharing (CORS) is a mechanism to relax the security rules imposed by the Same-Origin Policy (SOP), which can be …

Web Cache Deception (WCD) tricks a web cache into erroneously storing sensitive content, thereby making it widely accessible on the …

No. But actually, not really. Web Caches Let’s start with some background. Web caches are in-the-middle components physically located between a client and an origin web server. They are used to reduce the latency of HTTP requests by storing the responses of the server and serving them to the client when the same request is made again.

Web cache poisoning is an attack that allows an attacker to trick a web cache into storing malicious content (such as malicious JavaScript). This content is then served to all the unsuspecting users that request the poisoned URL 1.

I took part to the Reply Cyber Security Challenge 2022, a CTF organized by Reply, with a team of friends from the University of Trento. This is the writeup of the Web200 challenge.