Bug 1262787 - Security problem with F24
Security problem with F24
Product: Fedora
Classification: Fedora
Component: avant-window-manager (Show other bugs)
x86_64 Linux
unspecified Severity high
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Assigned To: Sindre Pedersen Bjørdal
Fedora Extras Quality Assurance
Depends On:
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Reported: 2015-09-14 07:22 EDT by Leslie Satenstein
Modified: 2018-05-29 08:36 EDT (History)
1 user (show)

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Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2018-05-29 08:36:43 EDT
Type: Bug
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RHEL 7.3 requirements from Atomic Host:
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Description Leslie Satenstein 2015-09-14 07:22:59 EDT
Description of problem:

I have three logons.. "root", "leslie2 and "other" as gnome logons.
leslie is administrator with full sudo NOPASSWD privileges

Here is how to create the problem.  TC4 any time after installation and updates.

1) Boot Fedora 
2) login leslie    Now leslie is active user is on tty2 (ctl-alt-f2)
3) Hit ctl-alt-f1  (the logon prompt is offered)
4) logon to other.  Other appears as ctl-alt-f3 (tty3)
5) hit ctl-alt-f1   logon as root  root appears as ctl-alt-f7

I can switch from one logon to the other without requiring passwords between them.

I just do ctl-alt-[f2|f3|f7]

Version-Release number of selected component (if applicable):

Fedora beta TC4  AND Fedora 22.

How reproducible:


Steps to Reproduce:

Actual results:
I can switch from one logon to the other without requiring passwords between them.

I just do ctl-alt-[f2|f3|f7]

Expected results:

Switching between users as shown above should require a password. Security should be enforced. 

Additional info:

This feature is a security flaw. As admin, I could be called away, and a second party could issue ctl-alt-f1, and log into the system. If he wants to do admin stuff, he just switches session as shown with steps and 4 above. 

This bug-feature is present in F22 as well

I have not checked if the same issue arises with MATE or xfce or KDE.
Comment 1 Leslie Satenstein 2015-09-14 07:30:04 EDT
I just tested with MATE.  Identical problem.

Interestingly,  Session 1, Leslie is with Mate, Session 2 Other is with Gnome, and session 3 (root logon) is with Gnome.

To me it does not appear to be a gnome problem, but a Linux problem( or feature???).
Comment 2 Leslie Satenstein 2016-05-29 23:59:27 EDT
Fedora 24 experiences this same functionality.
Comment 3 Leslie Satenstein 2017-05-24 21:47:53 EDT
This is simple to respond.  Is the current functioning of ctl-alt-f1 ctl-alt-f2 correct?

That is, if a user does a "Switch user" request and gives the system to the other user, does that other user, after logging in, have to right to visit the user who initiated the "switch user". Suppose first user is root and second is non admin user.
Comment 4 Fedora End Of Life 2018-05-03 04:18:21 EDT
This message is a reminder that Fedora 26 is nearing its end of life.
Approximately 4 (four) weeks from now Fedora will stop maintaining
and issuing updates for Fedora 26. It is Fedora's policy to close all
bug reports from releases that are no longer maintained. At that time
this bug will be closed as EOL if it remains open with a Fedora  'version'
of '26'.

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of Fedora, you are encouraged  change the 'version' to a later Fedora
version prior this bug is closed as described in the policy above.

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Comment 5 Fedora End Of Life 2018-05-29 08:36:43 EDT
Fedora 26 changed to end-of-life (EOL) status on 2018-05-29. Fedora 26
is no longer maintained, which means that it will not receive any
further security or bug fix updates. As a result we are closing this bug.

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