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Basic Security for your Website | Loudwhisper
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this post was submitted on 27 Jul 2024
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Good read.
I would just like to add some additional information that favors changing your SSH port to something other than the default. When crawlers are going around the internet looking for vulnerable SSH servers, they're more than likely going to have an IP range and specifically look for port 22.
Now can they go through and scan your IP and all of its ports to look for the SSH service? Yes. But you will statistically have less interactions with bad actors this way since they might specifically be looking for port 22.
Thanks! I did mention this briefly, although I belong to the school that "since I am anyway banning IPs that fail authentication a few times, it's not worth changing the port". I think that it's a valid thing especially if you ingest logs somewhere, but if you do don't choose 2222! I have added a link to shodan in the post, which shows that almost everybody who changes port, changes to 2222!
Yeah, I just left my SSH port as 22 since I only use key-based authentication so there's really no security risk. Plus, it's funny going through the logs and looking at all the login attempts.
Yep I agree. Especially looking at all the usernames that are tried. I do the same and the only risk come from SSH vulnerabilities. Since nobody would burn a 0-day for SSH (priceless) on my server, unattended upgrades solve this problem too for the most part.
I mean we just had https://nvd.nist.gov/vuln/detail/CVE-2024-6387 -- so my guess is that you're updating quite often to be so confident in your unattended upgrades.
Yeah I know (I mentioned it myself in the post), but realistically there is no much you can do besides upgrading. Unattended upgrades kick in once a day and you will install the security patches ASAP. There are also virtual patches (crowdsec has a virtual patch for that CVE), but they might not be very effective.
I argue that VPN software is a smaller attack surface, but the problem still exists (CVEs) for everything you expose.