this post was submitted on 06 Aug 2023
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36
History shows command I didn't run on my VPS (lemmy.ml)
submitted 1 year ago by [email protected] to c/[email protected]
10 comments fedilink hide all child comments
 

Hey guys, I saw this in my VPS when checking history:

    1  chmod +x /usr/lib/virt-sysprep/scripts/0001-swapoff--dev-vda2-mkswap--dev-vda2-swapon--dev-vda2-resize2f
    2  cat /usr/lib/virt-sysprep/scripts/0001-swapoff--dev-vda2-mkswap--dev-vda2-swapon--dev-vda2-resize2f
    3  vi /usr/lib/virt-sysprep/scripts/0001-swapoff--dev-vda2-mkswap--dev-vda2-swapon--dev-vda2-resize2f

here is the content of the script:

# cat /usr/lib/virt-sysprep/scripts/0001-swapoff--dev-vda2-mkswap--dev-vda2-swapon--dev-vda2-resize2f
swapoff /dev/vda2;mkswap /dev/vda2;swapon /dev/vda2;resize2fs /dev/vda1;yum -y update;systemctl disable guestfs-firstboot;reboot

This is a new server I provisioned on my VPS in racknerd. The command looks safe, but I'm wondering if these commands were executed on its own? Or someone has logged in to my VPS? This is also not normal, isn't it?

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[–] [email protected] 28 points 1 year ago

Looks like stuff put in place by the VPS provider that would run on the first startup to create a swap partition and resize the main partition.

[–] [email protected] 18 points 1 year ago

This looks like a provisioning command to expand disk to fill allocated space of your VPS.

[–] [email protected] 11 points 1 year ago (3 children)

From the location of that script usr lib virt-sysprep looks to be a script put in the image by the provided to do a few things on first boot. Would have thought it was normal, but you can always ask them to double check

[–] [email protected] 11 points 1 year ago (1 children)

I confirm that VPS companies use custom images with additional scripts. I’ve seen those a few times.

[–] [email protected] 1 points 1 year ago (4 children)

wait, the 3rd command is vi. I mean that's not an automated script, it should be executed manually, right?

[–] [email protected] 14 points 1 year ago

I'd say they made the image, started it, did minor adjustments and didn't delete the command history before stopping it and starting to deploy the image.

Looks harmless, although a tad sloppy.

[–] [email protected] 3 points 1 year ago

Good point, what happens if you run that command ? It might also just left over from when they made the custom image and forgot to clean it all up ?

[–] [email protected] 1 points 1 year ago

Perhaps it is listed in reverse chronological order; edit, check content, change permissions (for deployment)?

[–] [email protected] 2 points 1 year ago

good point, it's just a test server for now so I'll try to reinstall OS and check if same commands will show in history