Date: Sat, 7 Apr 2001 16:41:50 -0700 (PDT) From: davidx@viasoft.com.cn To: freebsd-gnats-submit@FreeBSD.org Subject: kern/26416: ctrl+alt+del --- normal user can reboot machine Message-ID: <200104072341.f37Nfok72061@freefall.freebsd.org>
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>Number: 26416
>Category: kern
>Synopsis: ctrl+alt+del --- normal user can reboot machine
>Confidential: no
>Severity: critical
>Priority: high
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Sat Apr 07 16:50:01 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator: David Xu
>Release: FreeBSD 4.3RC
>Organization:
Viasoft
>Environment:
All FreeBSD versions.
>Description:
a normal user can login console and press ctrl+alt+del to reboot
machine, there is no way to disable this action even it is what
root want. a root user can load a tweaked keyboard map to disable
ctrl+alt+del, but a normal user can still load another keyboard map
to re-enable ctrl+alt+del. this is a security problem.
>How-To-Repeat:
login console via normal user, load a bootable keyboard map, press
ctrl+alt+del, kick root away.
>Fix:
options:
1. disable normal user to load a keyboard map, but if it is a user
owned pc, it is kibitzed.
2. normal user presses ctrl+alt+del has no effect, but if it is
a user owned pc, this is also kibitzed.
3. final solution, add a sysctl item to let root user enable/disable
ctrl+alt+del.
>Release-Note:
>Audit-Trail:
>Unformatted:
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