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Bug 151918 - xscreensaver won't allow root to unlock screen
xscreensaver won't allow root to unlock screen
Product: Red Hat Enterprise Linux 4
Classification: Red Hat
Component: xscreensaver (Show other bugs)
i386 Linux
medium Severity medium
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Assigned To: Ray Strode [halfline]
Depends On:
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Reported: 2005-03-23 10:39 EST by Kathy Whyte
Modified: 2007-11-30 17:07 EST (History)
0 users

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Last Closed: 2005-03-23 11:29:14 EST
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Description Kathy Whyte 2005-03-23 10:39:13 EST
From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.5) Gecko/20041215 Firefox/1.0 Red Hat/1.0-12.EL4

Description of problem:
If a user locks the screen, entering the root password into xscreensaver fails to unlock the screen.

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

How reproducible:

Steps to Reproduce:
1.log in as any user
2.run xscreensaver/xlock
3.try to unlock the screen with the root password

Actual Results:  The root account is denied unlocking the screen from entering his password on the screen.

Expected Results:  Root should be able to unlock the screen from the screen.

Additional info:

I have found that if I obtain the source rpm and recompile minus the xscreensaver-4.06-rh.patch
patch and install the program with setuid root: -r-sr-xr-x root 
The root can then enter root's password at the screen and unlock it.
Comment 1 Ray Strode [halfline] 2005-03-23 11:29:14 EST
Hi Kathy,
we don't currently support unlocking the screen as root using this mechanism. 
This is a very big security hole because any user could write a program that
mimics the appearance of xscreensaver's lock dialog and record the root password
when an admin comes by and unlocks the screen.

You can terminate a user's session at any time by pressing ctrl-alt-backspace. 
You can unlock a user's session at any time by pressing ctrl-alt-f1, logging in
as root, an killing their copy of xscreensaver.  

Hope that helps.

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