In level 4 of OverTheWire Natas, what access restriction is in place and how is it bypassed to obtain the password for level 5?
In level 4 of the OverTheWire Natas challenge, there is an access restriction in place that requires the user to have a specific referer header in their HTTP request. The referer header is a part of the HTTP protocol that allows a web server to identify the URL of the webpage that linked to the current request. It is typically used for analytics and tracking purposes.
To bypass this access restriction and obtain the password for level 5, we need to modify the referer header in our HTTP request. By default, the referer header is set to the URL of the webpage that made the request. However, we can manually set the referer header to the URL of the level 4 page to bypass the restriction.
One way to achieve this is by using a browser extension or a tool like Burp Suite to intercept and modify the HTTP request. For example, in Burp Suite, we can intercept the request and modify the referer header before forwarding it to the server. We can change the referer header to the URL of the level 4 page, which is "http://natas4.natas.labs.overthewire.org/". Once the modified request is sent, the server will recognize the referer header and allow access to the password for level 5.
Here is an example of how the modified request may look like:
GET /level5 HTTP/1.1 Host: natas4.natas.labs.overthewire.org Referer: http://natas4.natas.labs.overthewire.org/
By setting the referer header to the URL of the level 4 page, we are effectively tricking the server into thinking that the request originated from the level 4 page, thus bypassing the access restriction.
In level 4 of OverTheWire Natas, there is an access restriction based on the referer header. By modifying the referer header in our HTTP request and setting it to the URL of the level 4 page, we can bypass the restriction and obtain the password for level 5.
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