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What is an HTTP Host header attack?
HTTP Host header attacks exploit vulnerable websites that handle the value of the Host header in an unsafe way. If the server implicitly trusts the Host header, and fails to validate or escape it properly, an attacker may be able to use this input to inject harmful payloads that manipulate server-side behavior.
What is Host header validation?
It is how the web server processes the header value that dictates the impact. The attack is valid when the web server processes the input to send the request to an attacker-controlled host that resides at the supplied domain, and not to an internal virtual host that resides on the web server.
What is the HTTP host header used for?
The Host request header specifies the host and port number of the server to which the request is being sent. If no port is included, the default port for the service requested (e.g., 443 for an HTTPS URL, and 80 for an HTTP URL) is implied. A Host header field must be sent in all HTTP/1.1 request messages.
What should I put in my host header?
What can be done with a host header attack?
Host header attacks may be used for web cache poisoning and attacks such as password reset poisoning. Web cache poisoning lets an attacker serve poisoned content to anyone who requests pages. Using password reset poisoning, the attacker can obtain a password reset token and reset another user’s password.
How does malicious site get the host header?
Web server receives this Host Header (malicious-site.com) If the application is using this Host Header in a link, the malicious site will be displayed. For example, the application may be calling a JS file with Host Header string. In this case, the website will call an address like the one below which points to attacker’s site:
Can a man in the middle attack on https?
And, since HTTPS is used you cannot mount a man in the middle attack to modify the Host header of an existing request. But even if HTTPS would not be used you gain not really anything new by modifying the Host header in the request since as a man in the middle you could already modify the Location header in the response anyway.
What do you mean by Host header injection?
HOST HEADER INJECTION ATTACK. The host header specifies which website or web application should process an incoming HTTP request. The web server uses the value of this header to dispatch the request to the specified website or web application.