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I scanned my friend's firewall (Zyxel SBG3500-N) with NMAP and I found some undocumented ports open with services:

8888 tcp open http syn-ack lighttpd 1.4.34

18443 tcp open http syn-ack lighttpd 1.4.34

I could not find any info why those should be open and browser just returns 404 - Not Found error. How could I investigate more those ports? Do you know any suitable fuzzing tool for this purpose?

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    Did you scan it from inside or outside the network? – A. Darwin Oct 1 '16 at 12:48
  • Ask your friend if he set up port forwarding – schroeder Oct 1 '16 at 12:57
  • It was scanned inside and no port forwarding. – V.Hedman Oct 2 '16 at 8:05
  • I was able to do some fuzzing with OWASP ZAP and their basic files, but with no info. – V.Hedman Oct 2 '16 at 8:06
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This is something used by routers: 'lighttpd'

A user can enable this in the router configuration page and add files to a designated folder or folders (likely the ones you were able to find). There they can store the files to run a simple webpage which can be accessed remotely just like any other website.

some info here: https://wiki.openwrt.org/doc/howto/http.lighttpd

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You could try SkipFish (https://code.google.com/archive/p/skipfish/)

It starts with a dictionary attack on the web server, and then combines that with a web-crawler.

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