this post was submitted on 06 Dec 2023
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Privacy
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The Chromium sandbox needs to be removed and something like Zypak needs to be used.
This means that the internal Browser sandbox is weaker and tab isolation. I could not find the source for that yet.
https://flatkill.org
Even though pretty old and probably outdated, some points are for sure true. Some apps like Onionshare are horribly outdated, and unless every app has at least one packager responsible for it, best official and paid, its a total mess.
Chromium on Flatpak stable for the first time - GNOME blog post
Firefox Snap vs. Flatpak
Flatpak Browser Sandbox Challenges
These where not the sources I refer to, and it is pretty complex. Secureblue disables user namespaces and uses bubblewrap-suid for security, but after madaidans statement that would mean a hole in bubblewrap allows the app root privileges.
Thanks for the additional reading and information. Maybe it's just me, but I feel like I hear about a security vulnerability in "processor microcode" or packages or other software basically every day. As a relatively non-technical user, it's always very difficult to tell how much these things actually matter for normal users. Flatpaks are incredibly convenient because they "just work" and are easily compatible with immutable distributions. For better or worse, I suspect many people are not going to be dissuaded from using them by hypothetical/abstract security risks.
Flatpaks are more and less secure. Their Sandbox improves 99% of apps security as other sandboxes are hard to setup and thus nearly nonexistent.
Browsers have their own, so just dont use Flatpaks there.
I am not sure about microcode, but processes running as root are maybe more critical, but it sounds like any process could have exploits if microcode is a problem. Also, RiscV or even ARM will be waaay better here, as their instruction set is not dozens of years old and extremely bloated.
As we get our apps from secure repos, with projects keeping track of every Git commit etc, we just had no malware really.
The only problem is that Flatpaks, like appimages, "just work" and dont have to evolve like the rest of the OS will. Their main goal is to work everywhere, and Devs always choose convenience over security.
For example Portals are not implemented in most old big projects like Libreoffice, Gimp, Inkscape etc. Scribus is even X11 only. But developers will not remove the
filesystem=hostpermission and replace it with "just all the media locations". This will still be a problem, but at least apps could not read Kernel logs etc anymore.Also as they "just work" its easy to abandon them and dont update. The "outdated Runtime" Warning is a veeery good indicator of a project using old and probably insecure libraries. But afaik there is no automatic CVE patching in flatpak-builder which is a huge problem.