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CrowdStrike downtime apparently caused by update that replaced a file with 42kb of zeroes (twiiit.com)

submitted 3 months ago* (last edited 3 months ago) by Aatube@kbin.melroy.org to c/technology@lemmy.world

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…according to a Twitter post by the Chief Informational Security Officer of Grand Canyon Education.

So, does anyone else find it odd that the file that caused everything CrowdStrike to freak out, C-00000291-
00000000-00000032.sys was 42KB of blank/null values, while the replacement file C-00000291-00000000-
00000.033.sys was 35KB and looked like a normal, if not obfuscated sys/.conf file?

Also, apparently CrowdStrike had at least 5 hours to work on the problem between the time it was discovered and the time it was fixed.

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[-] GroundedGator@lemmy.world 1 points 3 months ago

I don't remember much about my OS courses from 20 years back, but I do recall something about walls between user space and kernel space. The fact that an update from the Internet could enter kernel space is insane to me.

[-] Aatube@kbin.melroy.org 12 points 3 months ago

You mean you don’t update your kernel?

[-] GroundedGator@lemmy.world 3 points 3 months ago

I do, but I do it on my terms when I know it is stable. I don't allow anyone to push updates to my system.

[-] Aatube@kbin.melroy.org 8 points 3 months ago

Agreed. Point is, I’m pretty sure programs in kernel space can still read stuff in user space, which can be easily updated.

this post was submitted on 19 Jul 2024

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