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Bug 7875 - no root passwd prompt when booting single user mode: linux single
Summary: no root passwd prompt when booting single user mode: linux single
Alias: None
Product: Red Hat Linux
Classification: Retired
Component: aboot
Version: 6.1
Hardware: i386
OS: Linux
Target Milestone: ---
Assignee: Cristian Gafton
QA Contact:
Depends On:
TreeView+ depends on / blocked
Reported: 1999-12-18 05:25 UTC by williamsmw
Modified: 2008-05-01 15:37 UTC (History)
1 user (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 1999-12-20 17:25:30 UTC

Attachments (Terms of Use)

Description williamsmw 1999-12-18 05:25:00 UTC
I had to boot single user mode today and realized I am not prompted for a
password.  This is a really bad security risk.

Makes the system extremely vulnerable.

To duplicate:  at the lilo prompt type:  linux single

I tested this on RedHat 6.1 and Mandrake 6.1 which both allowed access to
entire system as root without a password.

Tested this on Caldera 2.3 and Corel 1.0, of which these systems gave the
expected prompt:

Give root password for maintenance
(or type Control-D for normal startup):

I need this fixed ASAP to certify my systems.....


Mark Williams

Comment 1 Chris Siebenmann 1999-12-19 03:24:59 UTC
A system that allows arbitrary LILO arguments cannot be secured
by giving single-user mode a password; one can just boot with
'linux init=/bin/sh' and bypass all of those checks. The real
solution is to set /etc/lilo.conf up to not allow extra arguments
without a password. (And to force the BIOS to boot only from the
HD, and to password-protect the BIOS.)

Comment 2 Bill Nottingham 1999-12-20 17:25:59 UTC
What he said. ;)

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