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181

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

submitted 23 hours ago* (last edited 22 hours 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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[–] Bombastic@sopuli.xyz 3 points 21 hours ago (1 children)

Inb4 some lucky dude just ran sublist3r or wfuzz on your subdomain and got a hit

[–] BonkTheAnnoyed@lemmy.blahaj.zone 3 points 21 hours ago (1 children)

I mean, it could be... I'll try it with a 128 char base 52 name and see what happens

[–] Keelhaul@sh.itjust.works 4 points 12 hours ago

Have you also tried making a subdomain and not making any requests to it yourself? So no browser access or other DNS resolution requests for the new subdomain. That should rule out some of the other possible causes suggested in the other comments.