this post was submitted on 16 Sep 2023
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TL;DR - What are you running as a means of “antivirus” on Linux servers?

I have a few small Debian 12 servers running my services and would like to enhance my security posture. Some services are exposed to the internet and I’ve done quite a few things to protect the services and the hosts. When it comes to “antivirus”, I was looking at ClamAV as it seemed to be the most recommended. However, when I read the documentation, it stated that the recommended RAM was at least 2-4 gigs. Some of my servers have more power than other but some do not meet this requirement. The lower powered hosts are rpi3s and some Lenovo tinys.

When I searched for alternatives, I came across rkhunter and chrootkit, but they seem to no longer be maintained as their latest release was several years ago.

If possible, I’d like to run the same software across all my servers for simplicity and uniformity.

If you have a similar setup, what are you running? Any other recommendations?

P.S. if you are of the mindset that Linux doesn’t need this kind of protection then fine, that’s your belief, not mine. So please just skip this post.

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[–] [email protected] 0 points 1 year ago* (last edited 1 year ago) (11 children)

Not at all. You leave a ssh port open, you don't necessarily get a virus. Try it. Set up a raspberry pi, install ssh and leave the port open in your firewall. It is much less risky than exposing rdp (the most comparable windows protocol) on windows for instance.

It is a security risk, but absolutely not comparable of installing pdf.exe. Not even in the same league of risk.

As said, try it now and tell me how it goes.

There is a lot of misinformation around security on Linux

[–] [email protected] 4 points 1 year ago (10 children)

Glad you asked, I run a ssh honeypot and get multiple connections adding ssh keys, trying to run lockr, downloading shit every day.

2023-09-16T09:09:48+0000 [SSHChannel session (1) on SSHService b'ssh-connection' on HoneyPotSSHTransport,14737,61.222.241.108] Command found: echo ssh-rsa AAAAB3NzaC1yc2EAAAABJQAAAQEArDp4cun2lhr4KUhBGE7VvAcwdli2a8dbnrTOrbMz1+5O73fcBOx8NVbUT0bUanUV9tJ2/9p7+vD0EpZ3Tz/+0kX34uAx1RV/75GVOmNx+9EuWOnvNoaJe0QXxziIg9eLBHpgLMuakb5+BgTFB+rKJAw9u9FSTDengvS8hX1kNFS4Mjux0hJOK8rvcEmPecjdySYMb66nylAKGwCEE6WEQHmd1mUPgHwGQ0hWCwsQk13yCGPK5w6hYp5zYkFnvlC8hGmd4Ww+u97k6pfTGTUbJk14ujvcD9iUKQTTWYYjIIu5PmUux5bsZ0R4WFwdIe6+i6rBLAsPKgAySVKPRK+oRw== mdrfckr >> .ssh/authorized_keys

[–] [email protected] 2 points 1 year ago (2 children)

Running a honey pot for SSH and sharing logs only proves that people try to attack you, it does not really tell if SSH as such is vulnerable or not. It is a honey pot, people gaining access if the whole point.

Having a locked down but exposed SSH access is something else.

[–] [email protected] 1 points 1 year ago (1 children)

You're missing my point, a virus doesn't have to infiltrate a completely secure system. It can come through you accidentally leaving your ssh insecure or any other service.

[–] [email protected] 2 points 1 year ago

I get that a malware can get inside the worlds most secure system, if for example a user lets it in. What I am saying is that showing a honey pot in response to "ssh is more secure than a software that runs code without you giving consent and without your knowledge" not say anything, except what happens if someone gets in.

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