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.
There are none. ClamAV is the only one there is, because it has a very specific and narrow purpose. There are no viruses for Linux.
Chrootkit and rkhunter are also built for very specific things (detecting rootkits - or making them) and are not designed to protect, they are designed to analyse.
My writing here also isn’t specifically to OP, but to all others that may find this thread - Anti Virus for Linux is BS and unless you are running SMB and still have lots of Windows in your network, it’s absolutely not needed, especially if you follow the basics (like not doing stuff as root, using sudo and not giving out any system rights).
…some Linux machines definitely need anti-virus software. Samba or NFS servers, for instance, may store documents in undocumented, vulnerable Microsoft formats, such as Word and Excel, that contain and propagate viruses. Linux mail servers should run AV software in order to neutralize viruses before they show up in the mailboxes of Outlook and Outlook Express users.[
Which is exactly what I said. ClamAV serves a very specific purpose and that’s this one.
There are still no viruses for Linux specifically designed to break in to Linux, because it’s not possible.
There are still no viruses for Linux … because it’s not possible.
Here is just one example that proves your assertion wrong.
Mirai and other botnets, coin miners, ransomware… Do you think that malware makers just decided to ignore the billions of Linux servers and IoT devices that exist?
Honestly, the best antivirus for Linux is Arch.
Its a rolling release, so will always have the most up to date and patched packages the fastest. That concept is the antivirus.
Can’t infect your machine if the vulnerabilities are already fixed.
Now where do new vulnerabilities come from? 🤔 Oh that’s right - from new code. And how often does new code show up on Arch? Oh…
Unfortunately you can’t easily patch the fleshy thing operating the system
AFAIK this is not what happens on NixOS. Every package gets installed into a directory that’s a hash of its dependencies in the nix store, but there’s no special isolation or anything on NixOS (well, when the packages are built there’s some isolation, but that’s mostly to keep the builds honest). That said, NixOS is a little better than most distros about creating separate daemon users for services with different permissions, but I don’t think it’s done universally. I love NixOS and it has many benefits, but I don’t think this is one.
I don’t understand your intention, as for tips and hints and end you post on this line:
“Ps: if you have a different opinions than I do skip this post”
That’s the perfect recipe for a circle jerk.
Okay sure same thing as Windows. If you aren’t reckless with the things you install and run then you are likely fine BUT there’s always a chance. All it takes is one slip up. Same logic as having a lock in the door knob and a deadbolt. By your logic (and many others), the lock on the door knob is sufficient and that may be okay with you BUT I’m gonna put a deadbolt on too just in case.
We can argue about this all day long. You will have valid points and so will I.
But would you put a deadbolt on your garage door? Or on your fridge door? IMO, arguing by analogy here just obfuscates the points – your servers aren’t physical doorways with locks, and comparing them just confuses the issue.
Can you explain what added security an antivirus package would offer for a Linux server? I haven’t done much with Linux administration, mostly just using Docker images for stuff at work.
I’m not a super Linux expert or anything, but I do grok tech, and I’m curious about this topic.
To be honest, antivirus software is just not really a security tool. If you’re at the point where malicious software is running on your server you’ve already lost and it’s hard to know what extent the damage will be. Having proper isolation is much more important (something which, tbh, Linux isn’t quite as great at as we’d like to think, at least not with additional effort… mobile operating systems seem to take the isolation of applications a lot more seriously). You could maybe argue that the anti virus software is useful for monitoring, but I’d rather have some stronger guarantees that my application isn’t going to take my lunch money and private keys than a notice a day later that something sketchy is on my machine… I won’t flat out say a virus scanner is completely useless, because of course you can contrive of scenarios where one could be helpful, but they’re kind of dubious.
Also yeah, ClamAV afaik isn’t really used like a typical windows antivirus. It’s mostly used on mail servers to scan email attachments. It’s not necessarily even looking for “Linux viruses”.
Okay, I think we can wrap this up: OP started with “I don’t want to be convinced of the predominant oppinion about security” and kept their word.
OP: You got your answer. There is no alternative to ClamAV. ClamAV is open source so it will always be slower than apt update in fixing vulnerabilities.
You can wonder why the whole community that created tons and tons of cool shit for Linux with armies of talented people with way more IT knowledge than all of us combined didn’t dedicate their time to Viruses. You can ask yourself how a virus would even get on your server… or you can not. Your choice. But the answer is: There is no alternative to ClamAV and ClamAV is set up mainly to detect Windows-Viruses that get spread by Mail-Attachments and the like.
