This bug was fixed in the package ubuntu-mate-meta - 1.282
---
ubuntu-mate-meta (1.282) jammy; urgency=medium
* Refreshed dependencies
* Removed gnome-system-tools from core-recommends, desktop-recommends
(LP: #1706770)
-- Martin Wimpress Sat, 09 Apr 2022 01:01:57 +0100
*
** Changed in: ubuntu-mate-meta (Ubuntu)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1706770
Title:
Lock screen can be bypassed when auto-login is enabl
This issue is caused by the Users and Groups utility which is part of
`gnome-system-tools`. When changing the password from "Asked on logon"
to "Not asked on logon" the user is added to the `nopasswdlogin` group
and this is what causes the switch-user screen to not ask for a
password.
If you selec
** Also affects: gnome-system-tools (Ubuntu)
Importance: Undecided
Status: New
** Also affects: ubuntu-mate-meta (Ubuntu)
Importance: Undecided
Status: New
** Changed in: lightdm (Ubuntu)
Status: Fix Committed => Invalid
** Changed in: arctica-greeter (Ubuntu)
S
** Also affects: mate-screensaver (Ubuntu)
Importance: Undecided
Status: New
** Also affects: arctica-greeter (Ubuntu)
Importance: Undecided
Status: New
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** No longer affects: ubuntu-mate
** Changed in: mate-session-manager (Ubuntu)
Status: Confirmed => Invalid
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Title:
Lock screen can be by
** Tags added: bionic focal
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Title:
Lock screen can be bypassed when auto-login is enabled.
To manage notifications about this bug go to:
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#6 Chris quote:
4. Go to "System" -> "Administration" -> "Users and Groups".
5. Change password from "Asked on logon" to "Not asked on logon".
6. Lock your machine.
7. Press "Switch User".
8. Observe no password is required to unlock as the current user.
I confirm this issue on Ubuntu Mate 20.04.0
Dammit! I cant believe this level of lack of security could happen in
this project. WHAT A SHAME!
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Title:
Lock screen can be bypassed when auto-l
** Tags added: xenial
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Title:
Lock screen can be bypassed when auto-login is enabled.
To manage notifications about this bug go to:
https://bugs
** Changed in: lightdm (Ubuntu)
Status: Confirmed => Fix Committed
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Title:
Lock screen can be bypassed when auto-login is enabled.
To man
** Information type changed from Private Security to Public Security
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Title:
Lock screen can be bypassed when auto-login is enabled.
To manage n
** Changed in: ubuntu-mate
Status: New => Confirmed
** Information type changed from Public Security to Private Security
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Title:
Lock scr
After a bit more investigation, being in the `nopasswdlogin` group is
what causes the switch-user screen to not ask for a password.
Having `autologin-user` set to your username in
/etc/lightdm/lightdm.conf is what works correctly.
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If it helps, I've reproduced this in a fresh Ubuntu Mate virtual
machine.
1. Install Ubuntu Mate following all the usual steps until you get to the
account creation screen.
2. Create a user account with a password and leave "require password at login"
checked.
3. Finish installation and reboot.
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: lightdm (Ubuntu)
Status: New => Confirmed
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Title:
Lo
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: mate-session-manager (Ubuntu)
Status: New => Confirmed
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Unable to reproduce this in Ubuntu MATE 17.04. I use full-disk
encryption too and enabled auto-login as well.
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Title:
Lock screen can be bypassed
** Also affects: lightdm (Ubuntu)
Importance: Undecided
Status: New
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Title:
Lock screen can be bypassed when auto-login is enabled.
To
** Information type changed from Private Security to Public Security
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Title:
Lock screen can be bypassed when auto-login is enabled.
To manage n
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