A 10 year old sudo related flaw has been discovered that can make unprivileged users obtain root permissions. Linux admins should patch this critical vulnerability as soon as possible.
Read more:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3156
Debian
Vulnerable
$ sudoedit -s /
sudoedit: /: not a regular file
Patch
$ sudo apt update
$ sudo apt install sudo
NOT Vulnerable
$ sudoedit -s
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