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cmospwd.txt
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cmospwd.txt
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=========================================================================
CmosPwd
Christophe GRENIER
grenier@cgsecurity.org
http://www.cgsecurity.org
=========================================================================
CmosPwd is a cmos/bios password recovery tool.
CmosPwd is under GNU Public License. You can freely distribute it.
It can be compiled under Dos, Windows, Linux, FreeBSD and NetBSD.
Platforms
- Dos-Windows version
Well, ... it works!
- Linux && BSD version
Users can work on cmos backup but they need root priviledge to
use ioperm function to have full access to cmos.
- Windows NT, 2000, XP, 2003
To work on cmos memory, ioperm need to be installed and running.
ioperm gives direct port I/O access for specified ports to user-mode process
(ring 3) using Ke386SetIoAccessMap and Ke386IoSetAccessProcess kernel functions.
1- You need administrator priviledges to install this driver
"ioperm.exe -i"
2- Start the service if needed with "net start ioperm"
3- Run "Cmospwd_win.exe"
WARNING: You should disable or uninstall ioperm
with "ioperm.exe -u" if you don't want to decrease
your security!
---------------------------------------------------
---------------------------------------------------
¦ Typical Usage for DOS and all Windows users ¦
---------------------------------------------------
---------------------------------------------------
1) Identify your BIOS manufacturer (usually displayed at boot-up)
2) Start in DOS, or start a DOS session in Windows 95/98/ME.
For Windows NT or Windows 2000 boot from a DOS or Windows 95/98 boot
disk (you can find boot disks at www.AnswersThatWork.com), and run
CMOSPWD from your boot floppy (or another floppy).
3) C: [Enter]
cd \CMOSPWD [Enter]
4) Type CMOSPWD at the DOS prompt and press Enter.
5) CMOSPWD will display a list of possibilities. Use the possibilities
itemised against your BIOS manufacturer.
Remember :
a) For AWARD BIOSes, use the Numeric Keypad (with NumLock ON).
b) AWARD 4.50PG BIOS always accepts "AWARD_SW", or "d8on",
or "589589".
c) Old Phoenix BIOSes will accept "phoenix".
6) If the standard method does not work, then try to kill
the CMOS password with CMOSPWD /K (and press Enter),
and then see if you can get into the CMOS without a password.
If you can, you successfully "killed" the old CMOS password.
DO NOT KILL THE CMOS ON LAPTOPS!
---------------------------------------------------
---------------------------------------------------
|General Usage (List of commands) |
---------------------------------------------------
---------------------------------------------------
cmospwd [/d]
cmospwd [/d] /[wlr] cmos_backup_file write/load/restore
cmospwd /k kill cmos
cmospwd /m[01]* execute selected module
/d to dump cmos in ascii and scan code
/m0010011 to execute module 3,6 and 7
Keyboard:
/kfr French AZERTY
/kde German QWERTY
default is US QWERTY
---------------------------------------------------
---------------------------------------------------
|Laptops |
---------------------------------------------------
---------------------------------------------------
On laptops, the password is usually stored in an eeprom on the motherboard,
you need an eeprom programmer (electronic device) to retrieve it.
Acer 630: eeprom 93c56 ?
Compaq M700: eeprom 24C02
Dell Inspirion 5100: eeprom 93lc46, password in scan code at 0x310
Dell Inspirion 7500: eeprom 24c164
Dell Inspirion 8100: eeprom 24c02
Dell Latitude C600: eeprom 24c02, password in scan code at 0x00, 0x10 and 0x90
Dell Latitude C610: eeprom 24c02, password in scan code at 0x00, 0x10, 0x80 and 0x90
Dell Latitude CPI: eeprom 24c02, password in scan code at 0x00, 0x10, 0x80
Dell D600: eeprom 24c04, password in scan code at 0x110
IBM Thinkpad X20: eeprom 24RFC08CN, password in scan code at 0x338
IBM TP 240: eeprom ?, password in scan code at 0x338.
IBM TP 380Z: eeprom 24c01, password in scan code at 0x38 and 0x40
IBM TP 390: eeprom 24c03 (be carrefull, there are two eeprom)
IBM TP 560X: eeprom 24c01, password in scan code at 0x38 and 0x40
IBM TP 570: eeprom ?, password in scan code at 0x338 and 0x3B8.
IBM TP 750C,755CX,760C,765D: eeprom 93c46, password in scan code at 0x38 and 0x40
OKI M811b may be written on the chip. Search near pcmcia slot or
adjacent the floppy connector on the top side of the board
IBM TP 770: eeprom 24c01
IBM TP 600E, T21, T23: 14 PIN 24RF08
IBM TP T20,X20,X30: 24RF08, password in scan code at 0x338 and 0x340
HP Omnibook 900,2100,4150,7150: eeprom AT24c164, 0x6D-0x7F area, unknow algo
put a 00 at 0x7F to clear admin password
HP Omnibook 6000: eeprom 24c08 or 24c164 0x50-0xBF area
(maybe 0x50-0x6F only), unknow algo
HP Omnibook 6100: eeprom 24c08
HP Omnibook XE3: eeprom 24c16
HP Omnibook 770x: eeprom 24c01
HP Pavilion ze4455ea: eeprom 24c08
HP VECTRA VL18: http://h200001.www2.hp.com/bc/docs/support/SupportManual/lpv06673/lpv06673.pdf
Sony pcg-fx950: eeprom 93c46 ?
Toshiba 74600C: eeprom 93c56
VAIO 641: eeprom 24c02 write zero at 0x0
be carrefull, there are two eeprom you must unsolder one to the pci
controler it is in the down side of the bord
VAIO 8851
eeprom 24c02 (ic 903) write zero at adres 0x0
the down side of the board
VAIO srx 87: eeprom 2408 write zero at 0x0
the ic is behind the modem in the top side of the board
VAIO PCG-FX150, eeprom 24c04 near the reference IC1103
VAIO PCG-GRX560, eeprom 24c04 near the reference IC1001
You can get/buy eeprom programmer in electronic shops or labs, you need
another PC to use it.
You can desolder the eeprom with hot air or you can try to "clip" the
eeprom. With the eeprom programmer, backup your eeprom and run
"cmospwd /d /l eeprom_backup". If you don't see the password, you can try
to fill the eeprom with zero or FF, don't forget the reset the cmos.
---------------------------------------------------
---------------------------------------------------
|Toshiba |
---------------------------------------------------
---------------------------------------------------
Differents passwords give the same 32-bit CRC, so CmosPwd can only give one
of them.
To reset the password of an old Toshiba, you can use KeyDisk. (cf my web page)
If this doesn't work, you can try to build the Toshiba Parallell loopback.
To make a simple device that you connect to your parallell port, a lot of
Toshiba computers remove the password when you boot it up.
The device, named "loopback" by some, could be made out of any
parallell wire with 25pins connectors (db25). You should connect
these pins: 1-5-10, 2-11, 3-17, 4-12, 6-16, 7-13, 8-14, 9-15, 18-25.
A db25 looks like:
1 13
_______
\_____/
14 25
---------------------------------------------------
Divers
- Medion
Try the password "am8888egh".
- Award 4.50PG
There is an universal password AWARD_SW.
(d8on, 589589 ... works too)
- Award 4.5x using DFI motherboards
The universal password is "Y. C. Lu" (spaces and capitals as shown).
Information from David Walker.
- Award
Differents passwords give the same 32-bit CRC, so CmosPwd can only give one
of them. Use the numeric keypad.
- COMPAQ LTE 5300 notebook
Tolga Sinan Guney: there is a reset jumper on the motherboard
- DIGITAL PC300, Phoenix 4.0 Rel 6.0,0
Rene Pocisk: cmospwd /k works
- Fujitsu ICL
aksion: passwords are stored in EEPROM
- Fujitsu Point 1600
William Simcox: "I was able to clear the password and reset BIOS to
default values using CMOSPWD /K"
- Phoenix
There is a backdoor in old version of Phoenix BIOS, the universal
password is "phoenix".
- Siemens Nixdorf
PCD-4ND, Michael: You can clear the password of this phoenix 1.03 with "cmospwd /k"
Scenic Mobil 700, Josef Benda: "cmospwd /k" works! Phoenix Note BIOS v4.0
Scenic Mobile 510AGP, Bernd: "cmospwd /k" works! Phoenix 4.0 R6 Version 3F31 dated 9.2.2000
- Acer Travelmate 530
"cmospwd /k" removes the password.
- Acer travelmate 2450
"cmospwd /k" removes the password.
- Sony Vaio PCG505HS
Brad Frisbie: "cmospwd /k" works, Phoenix 6 R4
- Sony Vaio PCG-FR105
Andrea Michele Zoia: 'cmospwd_win /k' removes the password.
- IBM NetVista 8303-41G
Roel: CmosPwd /k works, Phoenix Bios 4.0 Release 6.0.
- Panasonic CF-25
Stefan Stevens: CmosPwd /k works
- Tulip Vision Line bn 100
CmosPwd /k works, PhoenixBios 4.0 Release 6.0 11/03/01
- LG GS50-5FY notebook
Angelika Jurkiewicz: CmosPwd /k can remove supervisor password.
- TI Extensa 600CD
Dathan Alley: CmosPwd /k works
What to do if you can't use cmospwd to clear your cmos ?
Under Dos/Win9x, you can use debug to reset cmos CRC stored at 0x2E-0x2F
debug
-o 70 2E
-o 71 0
-q
What to do if cmospwd don't work on your PC ?
Try to clear password with cmospwd /k.
If cmospwd /k doesn't work, password is stored in an EEPROM. Try to find a
reset jumper on your motherboard or contact your PC vendor.
If it works, I can try to discover how passwords are encrypted.
I need to know what Bios you used and
some cmos memory backup with their passwords. (cmospwd /w backupfile)
For passwords, choose
- some 1 and 2-letter passwords
- BBBBBBB
- BBBBBBC
- BBBBBCB
- BBBBCBB
- BBBCBBB
- BBCBBBB
- BCBBBBB
- CBBBBBB
Thanks to
- Philippe Garcia-Suarez (AMI Zenith, IBM Thinkpad)
- Mark Miller (AMI WinBIOS)
- Ian Sharpe (Award 4.51PG)
- Darren Evans (Phoenix 4 release 6)
- Teun van de Berg (bug report for "cmospwd /w")
- Giovanni (IO access under NT)
- Robert Rafai (Dell Latitude)
- Guillaume Letessier (Toshiba)
- hackvenger (Phoenix 4.0 realase 6.0)
- "P. MADRE" (Award 4.51PG)
- SerbianHacker/Sasha Miloshevic (IBM ThinkPad 770)
- Michael (Siemens Nixdorf PCD-4ND, Phoenix 1.03)
- w0rm (Phoenix a486 1.03)
- Olaf Freyer (Phoenix 4.05 rev 1.02.943, Phoenix 4.06 rev 1.13.1107)
- Peter "Bluefish" Magnusson, author of !BIOS
- Tjiq (User password of AMI WinBIOS)
- Jedi (Award 4.51PG)
- Michel Creppy from Le Software Man
- YOGESH M (Award 4.51PG)
- Quattrocchi Stefano (Compaq DeskPro)
- Pencho Penchev (Award Medallion 6.0)
- Ernst Oudhof, bug correction for MODE_RESTORE_FORCE
- Lewis Hadley (Award 6.0 Medallion)
- Philippe Biondi (another AMI BIOS)
- Tompa Lorand-Mihaly (AMI Bios ver. 1.08 AN 1994 and Award 6)
- Jose Velasquez Villegas (ThinkPad 560x)
- bre786 (IBM ThinkPad T20)
- Ai-Nung Wang (Award 6)
- Zoulou Yankee (Compaq Deskpro)
- Markus Birth (Sony Vaio)
- Einar Karttunen (NetBSD support)
- Jason Gorski (Award 6.0PG, acer version)
- Michael Perekrestov (Samsung P25)
- Carl Farrington (VAIO/Acer)
- Andrea Michele Zoia (VAIO)
- Simon Comeau Martel (AMI 2.54)
and to all the guys, who provided information about cmos and reported bugs.
If you have problems or questions about cmospwd,
please mail me.
Christophe GRENIER
grenier@cgsecurity.org
http://www.cgsecurity.org