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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 [email protected] to c/[email protected]

190 comments fedilink hide all child comments

…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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[–] [email protected] 2 points 3 months ago (1 children)

You're right of course and that should be on Microsoft to better implement their driver loading. But yes.

[–] [email protected] 8 points 3 months ago

The driver is in kernel mode. If it crashes, the kernel has no idea if any internal structures have been left in an inconsistent state. If it doesn't halt then it has the potential to cause all sorts of damage.