This was fixed a while ago:
https://usn.ubuntu.com/3938-1/
Marking this bug as fix released. Thanks!
** Changed in: systemd (Ubuntu)
Status: New => Fix Released
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Upstream fix: https://github.com/systemd/systemd/commit/83d4ab5533 (in
systemd-242).
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https://bugs.launchpad.net/bugs/1812316
Title:
systemd: lack of seat verification in PAM mo
** Information type changed from Private Security to Public Security
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https://bugs.launchpad.net/bugs/1812316
Title:
systemd: lack of seat verification in PAM module permits spoofing