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Index > DOS > Bios Password Cleaning - Help

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sylwek32



Joined: 27 Apr 2006
Posts: 339
sylwek32
I removed the password from a Bios with the following
command in the Command line:

Quote:

debug
o 70 2E
o 71 FF
Q



Can somebody make a program in fasm wich prompts for deleting the password and then makes the same function ?
Post 15 Jul 2006, 18:14
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LocoDelAssembly
Your code has a bug


Joined: 06 May 2005
Posts: 4633
Location: Argentina
LocoDelAssembly
UNTESTED
Code:
org $100

  mov     ah, $09
  mov     dx, msg
  int     $21

  ; Clears keyboard buffer
  mov     ah, $04
  int     $16

  mov     bx, yes

.loop:
  xor     ax, ax
  int     $16

  mov     ah, al

  sub     al, 'a'
  cmp     al, 'z'-'a'
  ja      .checkChar

  sub     ah, 'a'-'A'

.checkChar:
  cmp     [bx], ah
  jne     exit

  inc     bx
  cmp     byte [bx], 0
  jne     .loop


remove:
  mov     al, $2E
  out     $70, al

  mov     al, $FF
  out     $71, al

  mov     ah, $09
  mov     dx, msg2
  int     $21

exit:
  int     $20

msg  db "Are you sure do you want to remove BIOS password?(type YES)", 13, 10, '$'
yes  db 'YES',0
msg2 db "Password cleared!!", 13, 10, '$'    


Last edited by LocoDelAssembly on 04 Aug 2006, 18:07; edited 1 time in total
Post 15 Jul 2006, 22:51
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sylwek32



Joined: 27 Apr 2006
Posts: 339
sylwek32
Thank you very much.. ill test it
Post 04 Aug 2006, 08:42
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sylwek32



Joined: 27 Apr 2006
Posts: 339
sylwek32
It works..
Can samebody make a security mechanism for it?
So that it ask double for deleting the pass.

Do you want to remove supervisor password from BIOS?[Y/N]
Really[I/O] Type I for Y !

?
Post 04 Aug 2006, 08:55
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sylwek32



Joined: 27 Apr 2006
Posts: 339
sylwek32
Maybe i have a good idea..
Let´s create a MiniBootFloppy with some Tools included..
e.g. this bios password remover..
and maybe:
- a HardDisk 0 filler (lowlevel formatting/zero filling)
- a Floppy 0 filler (0)
- a Bios Password remover
- The COM Monitor
Post 04 Aug 2006, 09:05
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LocoDelAssembly
Your code has a bug


Joined: 06 May 2005
Posts: 4633
Location: Argentina
LocoDelAssembly
I edited my code with a more secure prompting
Post 04 Aug 2006, 18:10
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saigon



Joined: 29 May 2006
Posts: 62
saigon
sylwek32 wrote:
Maybe i have a good idea..
Let´s create a MiniBootFloppy with some Tools included..
e.g. this bios password remover..
and maybe:
- a HardDisk 0 filler (lowlevel formatting/zero filling)
- a Floppy 0 filler (0)
- a Bios Password remover
- The COM Monitor


That is a good idea!
I have not been much around on these forums, as I have been working on my miniOS Razz
It is a graphical commandline application which has (should have Smile ) several tools such as a harddisk formatter, a mini internet text-browser, BIOS tweaks (password remover, etc.)... The only problem is, I can't bundle all those tools together into a 512-byte application... (floppy boot-sector). So I guess I have to start with a OS kernel loader Sad

However, I am not yet in the coding phase, I am still designing the miniOS (working title). I am doing stuff like how should it look like, how should it function, some optimization tricks, etc..

Anyone who wants to contribute please feel free to do it. I am sure we will together make a nice miniOS, through the power of FASM! (and our brains) Very Happy .
Post 05 Aug 2006, 10:11
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Dex4u



Joined: 08 Feb 2005
Posts: 1601
Location: web
Dex4u
I think he is thinking about using MiniDos
http://board.flatassembler.net/topic.php?t=5275&start=0
Post 05 Aug 2006, 19:39
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