chntpw

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chntpw
Developer(s) Petter Nordahl-Hagen (Formerly Petter Nordahl)
Initial release May 28, 1997; 19 years ago (1997-05-28)
Stable release
1.00 / February 1, 2014; 2 years ago (2014-02-01)
Written in C
Operating system Linux
Available in English
Type Data recovery
License GPLv2
Website pogostick.net/~pnh/ntpasswd/

chntpw is a software utility for resetting or blanking local passwords used by Windows NT, 2000, XP, Vista, 7, 8 and 8.1. It does this by editing the SAM database where Windows stores password hashes.

Features[edit]

There are two ways to use the program: via the standalone chntpw utility installed as a package available in most modern Linux distributions (e.g. Ubuntu[1]) or via a bootable CD/USB image. There also was a floppy release, but its support has been dropped.

Limitations[edit]

chntpw has no support for fully encrypted NTFS partitions (the only possible exceptions to this are encrypted partitions readable by Linux such as e.g. LUKS[2]), usernames containing Unicode characters, or Active Directory passwords (with the exception of local users of systems that are members of an AD domain). The password changing feature also isn't fully functional either, so password blanking is highly recommended (in fact for latter versions of Windows that's the only possible option). Furthermore, the bootable image might have problems with controllers requiring 3rd party drivers. In such cases use of the stand-alone program in a full-featured Linux environment is recommended.[3]

Where it is used[edit]

The chntpw utility is included in many various Linux distributions, including ones focused on security:

  • Kali – security-focused Linux distribution
  • SystemRescueCD – recovery-focused Linux distribution[4]
  • Fedora – general distribution
  • BootMed – Linux distribution focused on Windows recovery
  • (along with many others not listed here)

License change[edit]

For the software's 10th anniversary, the author changed the license from a non-commercial one to the GNU General Public License (GPL) Version 2.[5]

References[edit]

  1. ^ ubuntucat (28 July 2010). "How to reset a Windows password with Ubuntu". 
  2. ^ Matei Cezar (7 January 2015). "LUKS: Linux Hard Disk Data Encryption with NTFS Support in Linux". 
  3. ^ "Offline Windows pw & reg-editor, FAQ". Retrieved 5 September 2015. 
  4. ^ James Stanger. "Resetting Passwords with SystemRescueCd". Retrieved 5 September 2015. 
  5. ^ The Offline NT Password Editor History

External links[edit]