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How are people discovering random subdomains on my server? (lemmy.blahaj.zone)

submitted 5 months ago* (last edited 5 months ago) by BonkTheAnnoyed@lemmy.blahaj.zone to c/selfhosted@lemmy.world

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I generated 16 character (upper/lower) subdomain and set up a virtual host for it in Apache, and within an hour was seeing vulnerability scans.

How are folks digging this up? What's the strategy to avoid this?

I am serving it all with a single wildcard SSL cert, if that's relevant.

Thanks

Edit:

I am using a single wildcard cert, with no subdomains attached/embedded/however those work
I don’t have any subdomains registered with DNS.
I attempted dig axfr example.com @ns1.example.com returned zone transfer DENIED

Edit 2: I'm left wondering, is there an apache endpoint that returns all configured virtual hosts?

Edit 3: I'm going to go through this hardening guide and try against with a new random subdomain https://www.tecmint.com/apache-security-tips/

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[–] BonkTheAnnoyed@lemmy.blahaj.zone 9 points 5 months ago (2 children)

Shows up by name in the apache other_hosts...log, so yes

[–] zzffyfajzkzhnsweqm@sh.itjust.works 4 points 5 months ago

Going to IP directly could redirect to your first domain. This would trigger another request to your domain and could result in your logs.

[–] sommerset@thelemmy.club 2 points 5 months ago* (last edited 5 months ago)

You need to make sure to 444 drop connection immediately if wrong domain. Redirect to https should be configured after - I suspect ur config redirects