#StackBounty: #security #docker #cron #file-permissions #hardening Deleting cron directory in docker doesnt work

Bounty: 100

I’m trying to write a hardening script to remove the cron directory in an alpine linux based docker image.

docker run -it alpine:3.7
rm -rf /var/spool/cron
rm: can't remove '/var/spool/cron': Invalid argument

Sometimes the cron directory appears to have a crontabs file in it sometimes not, and removing it makes no difference to being able to delete the folder.

The odd part is that this is on an Amazon Linux 2 Image, if I try from my windows development box or an Ubuntu AMI the directory is able to be removed without issue.

Whats going on here?

Get this bounty!!!

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