Help with hacking GRUB password.

Anarki · Post by **Anarki** » June 6th, 2007, 1:55 am

My father has put a password on my computer's GRUB. I can access, but not modify, the grub .config file. I've been trying to look for a way to decrypt the md5 encrypted password:

Code: Select all

password --md5 $1$jPkAn1$FY0mU7X0MVykJnybVvMgy1

Unfortunatly, I have had no luck. Maybe you guys would like to have a crack at it!

Here is the entire config file.

Code: Select all

splashimage=(hd0,1)/boot/grub/psgrubsplash.xpm.gz
default 0
timeout 10
#password --md5 $1$FKP9s0$30JxvLeMFwdyFu4Of06L80
password --md5 $1$jPkAn1$FY0mU7X0MVykJnybVvMgy1

title windows
lock
root (hd0,0)
chainloader +1

title linux
kernel (hd0,1)/boot/vmlinuz root=/dev/hda2 ro reboot=bios resume=/dev/hda3 splash=silent vga=788
initrd (hd0,1)/boot/initrd.img

#title 2.6.6-3ps
#kernel (hd0,1)/boot/vmlinuz-2.6.6-3ps root=/dev/hda2 ro devfs=nomount reboot=bios resume=/dev/hda3 splash=silent vga=788
#initrd (hd0,1)/boot/initrd-2.6.6-3ps.img

title stage2.pavsoft.com.au (harddrive installation, upgrade and repairs)
lock
kernel (hd0,1)/stage2/vmlinuz root=/dev/loop1 ro devfs=nomount reboot=bios resume=/dev/hda3
initrd (hd0,1)/stage2/initrd.img

title floppy
lock
root (fd0)
chainloader +1

title linux-nonfb
kernel (hd0,1)/boot/vmlinuz root=/dev/hda2 ro reboot=bios resume=/dev/hda3
initrd (hd0,1)/boot/initrd.img

title failsafe
kernel (hd0,1)/boot/vmlinuz root=/dev/hda2 ro failsafe reboot=bios resume=/dev/hda3
initrd (hd0,1)/boot/initrd.img

#title alt_windows
#root (hd0,0)
#chainloader +1

#title windows1
#root (hd1,0)
#map (0x81) (0x80)
#map (0x80) (0x81)
#makeactive
#chainloader +1

Oh, yeah, the password he used is not a dictionary word - it's a combination of letters which stand for something. Don't bother trying to use the password, if you manage to crack it - trust me, he made the password specifically for my computer.

Cheers!

Draike · Post by **Draike** » June 6th, 2007, 2:22 am

What the hell does your dad do for a living >.>.

Anarki · Post by **Anarki** » June 6th, 2007, 2:25 am

That is not very nice.

I think.

He does computer stuff.

Bartimaeus² · Post by **Bartimaeus²** » June 6th, 2007, 4:06 am

That's probably why it's so weird, he did something very complicated to it

Post by **Dekar** » June 6th, 2007, 8:36 am

md5 is no encription... it's a checksum... so of the password itself has more
letters than the password there will be more than one valid passwords

anyway... you won't be able to get it... but you will be able to change it,
if you can boot from cd or usb (or have access to the bios!)...
cuz if you aren't loading this grub thing it isn't able to block you from editing
it

btw, what do you want to change?

Anarki · Post by **Anarki** » June 7th, 2007, 8:09 am

If I wanted to change something, I would want to change the -lock on the floppy. Then I could create several boot disks when I'm using Windows, and use them whenever I feel like it.

>.>

But I'm not quite sure how. I can log into Linux, but I cannot modify the GRUB config - only view it.

Post by **Dekar** » June 7th, 2007, 8:47 am

are you allowed to boot from cd or ub-stick?

Anarki · Post by **Anarki** » June 8th, 2007, 1:01 am

Actually, I think you can.

Except I don't know how to create a Windows Boot-CD... lol >.>