this post was submitted on 08 Apr 2024
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To get rid of Viruses, simply clean out all executable attachments in mails, mailcow and other solutions support that.
You can also mount /home nonexecutable, which means everything you can run needs to be on the system. Without that, "control over what is installed" is worthless. You could literally download any package, export the binary and run it from anywhere.
To run untrusted software, you can use a server that uses something like KASM. It is image-based, accessed through the browser, suppports uploading files and viewing lots of stuff. You can also run antivirus there, but as shown in this video antivirus is often simply tricked by encoding and re-encoding the scripts into something like Base64.
Antivirus really is flawed. You need to control the origins of code, and run all untrusted code in immutable VMs.
The correct way to call bash scripts is through bash, e.g.
bash badware.shExcel sheets can be used without macros, i.e. executable code. Macros can be disabled in Libreoffice afaik, and this is likely possible via some sort of policy.
These are great things to try out and I want to experiment with it when I have time. For example not sure if policies work with flatpak, as users could be able to change them.
Antivirus is a joke, for sure you could run it, but it just doesnt work. It would be just there for the compliance, while you simply dont run any code, not even trusted code, that doesnt come from trusted repos like Fedora, Ubuntu or flathub-verified
You know, it only now occurs to me that - in 20 years of setting up fairly complicated spreadsheets (for everything from finance to asset management) - I've never used a macro.
I honestly don't know why you would, since per-cell functions update automatically. I certainly can't imagine why it would need to make system calls. Whole thing seems like a massive security issue with no benefit.
Yes but insurance compliance necessitates AV
If you dont even have a way of running untrusted code on your production environment, how the heck is that worse than badness enumerating AV?
Insurances....
Even if you assume that the software you run will never have exploitable security issues, AV can also keep you from spreading infected files e.g. through forwarded mails.
See above. There are tools for mail servers to strip and sandbox all executable attachements.
MSOffice btw doesnt allow macros anymore afaik