403 Error when attempting to access images located in a parent directory of inline CSS styling

Within the <style> section of the login page for my router's web interface, there is a CSS declaration that includes:

background: url("../img/login/logo.png")

This main page can be accessed from the IP address of my router (192.168.0.1:80). The page loads correctly in Chrome and the image is displayed without any issues. However, when attempting to access this URL in a browser or through a tool like Postman, a 403 response is received. More details on this response can be found here.

A similar problem arises when trying to set up an A record in Route 53 to direct to my home network’s IP address. Images and other scripts on the site that use relative paths fail to load, showing as 403 errors in Chrome’s request/response information. The Request URL changes to my domain 

http://myrouter.example.com:1337/img/login/logo.png
, with the remote address and referrer being my home network’s IP. Strangely, the rest of the login page loads normally with this setup, indicating that only the relative paths are causing issues.

Why is this happening? While I know that a 403 error means the server has rejected the request, it appears to be reaching the router but not responding with the image.

htmlcsshttpamazon-route53

Answer №1

It is likely that the web server places importance on the HTTP_HOST variable and will only respond when accessed through the numerical IP address. This practice is commonly used by network administrators to prevent DNS rebind attacks. In my experience with PFSense, this setup is the default configuration.

You might not have the ability to bypass this feature on your router, as most Small Office/Home Office routers do not support it. If you desire more customization options (and based on your expertise level, you probably do), I suggest utilizing PFSense!

Answer №2

Perhaps it's just a matter of the web server conducting a referrer check. I noticed you've provided headers for the 200 OK response, but not for the 403 response. Comparing the two should help identify the issue.

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