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by Jenda_ 926 days ago
> attaching a compromised PDF

This means either:

- a 0day, which would require the AV to have a PDF parser better than the standard document viewer, and the ability to sense that this PDF is "weird" -- I would expect AV companies to publish ads "our AV has detected a 0day in XXX"

- a vulnerability was recently discovered in a PDF viewer, and the AV company can push their definitions earlier than the standard "package the fixed version - send to debian-security - let users upgrade" route. This would shorten the attack window by a few hours. Again, I would expect AV companies to boast "we were X hours earlier than the official fix".

Which one is the case? Or is there another option?

Actually, this whole "buggy PDF parser" thing should be solved by application sandboxing -- there is no need that document viewer needs any other access to my system. Unfortunately, Linux is lagging behind. There are some AppArmor experiments with not so great UX, and then there is QubesOS, which is difficult to use. The average Linux desktop is AFAIK almost unsandboxed.
1 comments
consumer451 926 days ago
Thank you for replying.

I am now at the limits of my understanding...

I only ran Ubuntu as a desktop daily driver for a year or so, and I'm a muggle, so my understanding is limited. But, is there any real-world data on how often desktop Linux users run the equivalent of:

  sudo apt update
  sudo apt upgrade
  sudo apt dist-upgrade
versus the more automated update systems MacOS or Windows ?

I am genuinely curious which ecosystem is more likely to be up to date. In my limited experience, I ran into issues updating on Ubuntu, and have not on MacOS and Windows. It seems like MacOS does it best as most applications come via the App Store, and on Windows that's in the future leaving most apps to take care of their own updates. However, Windows makes up for that a little bit with excellent, and auto-updated EPP, so that's something at least.

In your view, which desktop OS is most likely to be up to date for OS and apps?

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Jenda_ 926 days ago
I think Ubuntu has some kind of notifier in "tray". For me, I am subscribed to debian-security mailing list and update when something that is running on systems that I manage seems to be affected.

> versus the more automated update systems MacOS or Windows

I'm not sure -- it is better with Microsoft Store, but other apps solve updates on their own, with various success. I have little experience with Windows and no with mac OS, so I cannot comment.

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