CVE-2018-7738 - command execution via unmount's bash-completion

[Jeremy Bícha]

"In util-linux before 2.32-rc1, bash-completion/umount allows local users to gain privileges by embedding shell commands in a mountpoint name, which is mishandled during a umount command (within Bash) by a different user, as demonstrated by logging in as root and entering umount followed by a tab character for autocompletion."

https://security-tracker.debian.org/tracker/CVE-2018-7738

Here is the patch that Debian applied earlier:
https://salsa.debian.org/debian/util-linux/blob/1d518f8b38e81cfcc6e0cd1ecbf9ea72d568e53a/debian/patches/bash-completion-umount-use-findmnt-escape-a-space-in.patch

It's already been fixed in cosmic but needs to be fixed in bionic.

I saw this link on social media this weekend:
https://blog.grimm-co.com/post/malicious-command-execution-via-bash-completion-cve-2018-7738/