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PassPass - Bypass the Password

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4 replies to this topic

#1
HolmesSherlock

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Meet PassPass (Bypass the Password), a nifty Grub4DOS batch script to disable/re-enable Windows logon password validation. Credit (as well as dis-credit) is to be equally shared between jaclaz and Holmes.Sherlock for the idea and coding respectively. We appreciate any success/failure report mentioning the following:
  • Windows version (e.g. XP, Vista, 7)
  • Architecture (e.g. 32-bit/64-bit)
  • msv1_0.dll version (e.g. 6.1.7600.16525) along with MD5 checksum, if possible

Technical details: The script tries to locate all existing Windows installations and corresponding Windows editions as well. Thereafter, it replaces the CMP instruction responsible for password verification with a 'benign' sequence of bytes. For reverting back the changes, the process is just the opposite. The whole idea is derived from WindowsGate and Astr0baby's tutorial.

Usage:
  • Install Grub4DOS. You may prefer using RMPrepUSB. Script tested with Grub4DOS v0.4.5c-2013-03-03.
  • Download grubutils and copy WENV binary on the root of the boot media. Script tested with grubutils-2011-06-27.
  • Copy PassPass.g4b and menu.lst on the root of the boot volume.
  • Boot.
  • Ideally 'Autodetect' mode should be able to list out all existing Windows installation. For buggy BIOS-es, try appropriate <Disk#> and <Partition#> to 'Forcedetect' Windows installations.
  • Choose either 'Patch' or 'Unpatch' respectively for disabling/re-enabling password verification.
  • Reboot and boot into target Windows.
Credits:
  • jaclaz - For ideas, code snippets, information. The script embeds his DLL version detection script.
  • Ectomorph a.k.a. Damian Bakowski - For his 'unannounced' patch for 32-bit version of msv1_0.dll.
  • Astr0baby - For his reversing tutorial

Download: http://www.sherlock....s-the-password/

Development: https://code.google....pts/source/list

Edited by HolmesSherlock, 02 June 2013 - 08:26 PM.

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#2
roman2018

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PassPass is a new tool and it can't compete with PCUnlocker currently. But PassPass is free and it should attract more attentions in future. Keep up your work!



#3
MrJinje

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Sounds cool.  Will have to check this out and report back.



#4
jaclaz

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PassPass is a new tool and it can't compete with PCUnlocker currently.

Oh, yes it can :yes:.
Whether it will win or not, that's another thing ;).
 

The important thing in life is not victory but combat; it is not to have vanquished but to have fought well.


I find strangely "queer" that someone joins a board only to mention how a specific Commercial tool is "better".  :unsure:

Particularly because nothing but a bootable PE of *any kind* (with no added tool of any kind) is needed to reset a Windows password.

 

Needing (or supporting) a 30 Mb+ piece of bloat (payed for - additionally) to do something that can be done with a tool that anyone should have (a suitable bootable PE or the OS install CD/DVD/USB) seems to me like overkill.

 

And I won' t even touch the topic of re-distributing non-redistributable MS files or distributing GNU licensed software  (Syslinux/Memdisk) without providing the License nor the source code. :whistle:

And BTW, a minimal PE will have quite a few issues in booting and accessing a largish number of SATA hard disks equipped PC's.
 

But PassPass is free and it should attract more attentions in future. Keep up your work!

Will do, rest assured.

jaclaz



#5
jaclaz

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Just to keep the topic updated, PassPass now works also with Windows 8.1 (thanks Steve6375) and boulcat made an AutoIt version that can run in a PE (thus can be used also on UEFI machines that have not CSM/BIOS mode).

 

Link remains valid:

http://www.sherlock....s-the-password/

 

To discuss/troubleshoot/whatever the AutoIt version PEPassPass, topic is here:

http://reboot.pro/to...045-pepasspass/

 

jaclaz






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