topic Re: Forget Root password !! in Operating System - Linux

Forget Root password !!

jackfiled — Wed, 01 Sep 2004 04:07:47 GMT

Help me.. please

we have a RedHat 7.0 box.
but nobody knows root password.~
we have no OS CD box.
Urgent problem.
Any tips are available. Help
we are wating for your help

Re: Forget Root password !!

Sยภเl Kย๓คг — Wed, 01 Sep 2004 04:44:06 GMT

Dear Jack
Try this
Boot the machine in to singleuser mode.If you are lucky u will directly get the # prompt.Once after getting the # use the passwd command to change the root user password.
#passwd
Enter the password:
Reenter Password:

If you are able to do this ...good

All the best

SK

Re: Forget Root password !!

Slawomir Gora — Wed, 01 Sep 2004 05:04:55 GMT

Hi,

you can download floppy boot disc from redhat web or slackware.

ftp://sunsite.icm.edu.pl/pub/Linux/slackware/slackware-9.1/bootdisks/bare.i
ftp://sunsite.icm.edu.pl/pub/Linux/slackware/slackware-9.1/rootdisks/rescue.dsk

boot from floppy boot disk

mount you RedHat partition to /mnt

edit /mnt/etc/shadow end erase second field (hashed pass)

umount and reboot

Re: Forget Root password !!

Josef Forman — Wed, 01 Sep 2004 07:44:44 GMT

Hi,
try at boot time like a param for kernel write "init=/bin/sh"
then on prompt line write "mount -n -o remount,rw /"
and now you can use passwd to change root password.

PF

Re: Forget Root password !!

Steven E. Protter — Wed, 01 Sep 2004 09:15:37 GMT

There is no way to bypass or decrypt the pasword on a RH 7 box. The console prompt will require a password.

You may get lucky about 50% of the time if the admin used a simple password, the crack utility may be able to give you the password.

So:

cd /root
cp /etc/shadow .

run crack against shadow and see if it gives you root.

Then implement password list procedures that are safe.

If crack can't do it you are pretty much done. Get an upgrade cd and use regular uers to get data off the box prior to starting. Any upgrade higher than RH 8.x is destructive.

You can always download and create a RH 7 boot cd. I don't know if that gains you anything.

SEP

Re: Forget Root password !!

Alexander Chuzhoy — Wed, 01 Sep 2004 09:49:42 GMT

I'd reset the password.
from the lilo boot-press ctrl+x
then specify to boot to init 1.
This init logs you in as root without prompting for username/password.
From command line issue the passwd command
and reset the password for root.

Re: Forget Root password !!

Olivier Drouin — Wed, 01 Sep 2004 10:25:39 GMT

I normally use Josef Forman's method.
Not that it happens often tough ;-).

Re: Forget Root password !!

Chris Saunderson — Thu, 02 Sep 2004 11:44:21 GMT

Download a rescue disk, create rescue disk, boot from rescue disk, edit /etc/shadow to remove the password, reboot, login, change password!.

Re: Forget Root password !!

Francesco Sarno — Fri, 03 Sep 2004 10:09:15 GMT

I think li chris.It is the simpler solution
F.

Re: Forget Root password !!

Jan Sladky — Mon, 06 Sep 2004 03:14:43 GMT

You have still a chance !

before boot type this kernel parameter: init=/bin/bash

You'll get bash console
then
mount -n -o remount,rw /
then
passwd
type new passwd !

br Jan