Posts

How To Reset Windows XP, Vista, Windows 7 Passwords with Ubuntu 9.10 Live Image and a USB Drive

I put this together for a project in a class I am taking, and thought it would be handy for others as well. The goal is to access a Windows filesystem and reset the password for a user, for example if someone forgot the Administrator password or the account is locked out from too many bad password login attempts. This works on all modern Windows Operating Systems: Windows 2000, 2003, XP, Vista, Win7 etc. Make sure to create a backup if you want to make sure you don’t corrupt your Windows install, as it can happen.

Tools used:

Accessing the Filesystem

First we use unetbootin to install Ubuntu 9.10 to a flash drive. The flash drive needs to be at least 1GB to install the image.

Unetbootin settings

Select “Diskimage” and then the .iso file we downloaded of the Ubuntu 9.10 image.

Select the USB Drive and Drive Letter to install the ISO onto. Click OK:

Unetbootin doing its thing

Once the program is done, click ‘exit’ and remove the USB Drive. You now have a bootable live image of Ubuntu 9.10.

Plug the usb drive into the target system. Boot off of the drive, you may need to change the boot options in the BIOS if it is set to boot off of the hard drive. Select “Default” in the unetbootin boot menu to boot into the Ubuntu OS. It will automatically log you in.

Once booted you already have access to the Windows filesystem since the ntfs filesystem driver is included in the kernel. This is nice and wasn’t the case not too long ago.

We chose two reasons to use unetbootin and Ubuntu 9.10. The first is the ease of use of installing a bootable image. After downloading the two packages, it is trivial to load the OS onto the drive, and since it includes ntfs drivers it allows us to access the unencrypted hard drive on boot. Since it is on a USB drive, any system made since 2000 or so should be able to boot this. You don’t need to lug around a CD or even access the CD drive.

To prevent easy access to the hard drive, encryption of the hard drive partition would be necessary using Microsoft EFS or TrueCrypt hard drive encryption software. After encrypting the hard drive, any live operating system running would not be able to decrypt the hard drive easily.

Furthermore, installation of a BIOS level password would ensure that any unauthorized users would not be able to boot alternative operating systems via USB, CDROM, Floppy or other method. The only way to defeat a BIOS level password would be to reset the BIOS (requiring entrance into the hardware of the system) or using an Evil Maid style attack.

The Evil Maid attack is performed by a theoretical malicious party that has access to the target PC without alerting the legitimate user. Without knowledge of the authorized; a root kit or device would be installed (for example, on the USB connector of the keyboard) to sniff out the password as entered on bootup. After the user boots the system and finishes her work, ostensibly shutting down the system securely, at least to her knowledge, the Evil Maid would then collect the password entered into the BIOS, thereby defeating the BIOS password security measure.

Resetting the Password

We can now reset the Administrator or any other password on this system using the tool chntpw. To install this package, ensure the system has a connection to the internet (via dhcp perhaps?) and run the command:

sudo software-properties-gtk --enable-component=universe --enable-component=multiverse; sudo apt-get update; sudo apt-get install chntpw

Alternatively, you can download the executable and place it on the USB drive to give access without connecting to the internet. chntpw is the software that modifies the SAM (Security Accounts Manager) database file. Use the terminal to change directories to the password file

cd /media/path/to/disk/WINDOWS/system32/config/

Then execute the chntpw utility:

  # sudo chntpw -u username SAM SYSTEM

View the sample output:

ubuntu@ubuntu:/media/B830C9BC30C981BC/WINDOWS/system32/config$ sudo chntpw SAM SECURITY
chntpw version 0.99.5 070923 (decade), (c) Petter N Hagen
Hive <SAM> name (from header): <\SystemRoot\System32\Config\SAM>
ROOT KEY at offset: 0x001020 * Subkey indexing type is: 666c <lf>
Page at 0x7000 is not 'hbin', assuming file contains garbage at end
File size 262144 [40000] bytes, containing 6 pages (+ 1 headerpage)
Used for data: 255/20736 blocks/bytes, unused: 9/3648 blocks/bytes.

Hive <SECURITY> name (from header): <emRoot\System32\Config\SECURITY>
ROOT KEY at offset: 0x001020 * Subkey indexing type is: 666c <lf>
Page at 0xe000 is not 'hbin', assuming file contains garbage at end
File size 262144 [40000] bytes, containing 13 pages (+ 1 headerpage)
Used for data: 1074/49024 blocks/bytes, unused: 9/3808 blocks/bytes.

* SAM policy limits:
Failed logins before lockout is: 0
Minimum password length        : 0
Password history count         : 0
| RID -|---------- Username ------------| Admin? |- Lock? --|
| 01f4 | Administrator                  | ADMIN  | dis/lock |
| 03ec | ASPNET                         |        | dis/lock |
| 03ed | CSC603                         | ADMIN  | dis/lock |
| 01f5 | Guest                          |        | dis/lock |
| 03e8 | HelpAssistant                  |        | dis/lock |

---------------------> SYSKEY CHECK <-----------------------
SYSTEM   SecureBoot            : -1 -> Not Set (not installed, good!)
SAM      Account\F             : 1 -> key-in-registry
SECURITY PolSecretEncryptionKey: 1 -> key-in-registry

***************** SYSKEY IS ENABLED! **************
This installation very likely has the syskey passwordhash-obfuscator installed
It's currently in mode = -1, Unknown-mode
SYSKEY is on! However, DO NOT DISABLE IT UNLESS YOU HAVE TO!
This program can change passwords even if syskey is on, however
if you have lost the key-floppy or passphrase you can turn it off,
but please read the docs first!!!

** IF YOU DON'T KNOW WHAT SYSKEY IS YOU DO NOT NEED TO SWITCH IT OFF!**
NOTE: On WINDOWS 2000 it will not be possible
to turn it on again! (and other problems may also show..)

NOTE: Disabling syskey will invalidate ALL
passwords, requiring them to be reset. You should at least reset the
administrator password using this program, then the rest ought to be
done from NT.

Do you really wish to disable SYSKEY? (y/n) [n]
RID     : 0500 [01f4]
Username: Administrator
fullname:
comment : Built-in account for administering the computer/domain
homedir : 

User is member of 1 groups:
00000220 = Administrators (which has 2 members)

Account bits: 0x0210 =
[ ] Disabled        | [ ] Homedir req.    | [ ] Passwd not req. |
[ ] Temp. duplicate | [X] Normal account  | [ ] NMS account     |
[ ] Domain trust ac | [ ] Wks trust act.  | [ ] Srv trust act   |
[X] Pwd don't expir | [ ] Auto lockout    | [ ] (unknown 0x08)  |
[ ] (unknown 0x10)  | [ ] (unknown 0x20)  | [ ] (unknown 0x40)  | 

Failed login count: 1, while max tries is: 0
Total  login count: 1

- - - - User Edit Menu:
 1 - Clear (blank) user password
 2 - Edit (set new) user password (careful with this on XP or Vista)
 3 - Promote user (make user an administrator)
 4 - Unlock and enable user account [probably locked now]
 q - Quit editing user, back to user select
Select: [q] >

Depending on the status of the SYSKEY password security, you may only be able to blank the password and not actually change it. I recommend blanking the password and then resetting it once you log into the system.

You can also unlock a system if the user accounts have all been locked out due to too many login attempts or any other reason. Using these tools you can gain access to almost any unencrypted Windows system, from Windows NT up to Windows 7.

As a warning, If there is data on the hard drive you wish to keep, make sure to make a backup of the hard drive before performing this password as it can corrupt the Windows installation.

Social Media and the Downfall of the Password Reset Question

There have been a number of high profile account compromises due to the insecurity of password reset questions. Examples of two big ones off the top of my head are Sarah Palin Yahoo account compromise and the Twitter “Hacker Croll” fiasco. There have been many more compromises on accounts due to weaknesses in password reset questions, even if they are rarely as publicized in the main stream media like the previous two. The attacks are basically the same – primary e-mail accounts are typically secured by password, and the password can be changed by entering an answer to a password reset question.

Both of these account compromises were caused by weak password reset questions. And although Palin certainly was/is a high profile account, the Twitter compromise was caused by a low-profile IT Administrator who happened to store sensitive company documents in their Google Docs folder. This goes to show that everyone, from the CEO of a large company, to a low-level system administrator, is accountable for the security of their accounts.

Sample (bad) Password Reset Questions:

Many e-mail accounts use a typical range of password reset questions:

  • What is your mother’s maiden name?
  • What was your first pet’s name?
  • What is your favorite sport?
  • What is your oldest daughter’s name?
  • More Questions

Even questions regarded as “Good” on this list are easily guessable if you have access to the social networks of an individual. For example: What is the middle name of your youngest child? What is your oldest sibling’s middle name? Answers to these questions often appear on Facebook or other social media websites.

After coming up with the idea to write this article, I took a look at my own email account password reset question. It was set to my Father’s middle name. I had probably set this when I first signed up for a  beta account back in 2005 or so – I was not in the mindset that it would become my primary account and also be the gateway to a bevy of information. As with many folks, when I sign up for a new account on a website, it will often e-mail me my account information (including my password, boo!) to my e-mail account. And, as I suspect with most people, I do not follow best practices and use a different password for each account. Not to mention that many other accounts will send an email to your account on file in order to reset their passwords. Therefore, since not only the main account password at risk, there is a lot riding on the security of your email account. If someone can gain access to your email account, they also gain access to a lot of frequently used passwords and accounts. Domain hijacking has occurred using this method.

The Solution

The first step is that password reset questions must not be answerable by information available via social networking sites. For someone who is very active in social networking, this might be hard to come up with at first, but really is not hard.

A good password reset question is:
Not easily guessable from online or offline sources (secure)
Stays the same over a long period of time (stable)
Is readily recallable by authoritative person (obtainable)
Has only one answer (definitive)

My source for questions that satisfy these metrics is my wallet. I look for cards that have information that will stay the same for a long period of time, for example, a driver’s license, library card or other membership card.

You can then reset your password question to a value on those cards. If the site does not let you ask your own password reset question, you might try to replace a common one, such as “mother’s maiden name” with this. Just be careful you don’t get too tricky, or you might forget the correct question/response to the answer and lose access to your account for good.

For a sample answer, you might use the first 5 digits of your driver’s license ID, plus the last 6 of your gym membership card. Really you can use any information that you want that you do not share on social media websites.  Just make sure they follow the four guidelines above.

Do you have any tips for a good password reset question?

Password Protected Folder Gives 404 Not Found in WordPress Installation Sub-folder.

Wordpress

Came across this little maddening issue again today after fixing it a few months back. I created a directory that is password protected using a .htaccess file. However, when trying to access this folder or anything under this directory, a File Not Found 404 error from WordPress is displayed before it even prompts you for the password. The problem here lays within the main WordPress .htaccess file

The default .htaccess file for WordPress is:

# BEGIN wordpress

RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]

# END wordpress

This means that if a file is requested from the server, if it is not a file that exists in the server’s folder directory (!-f) and if it is not a directory that exists in the server’s folder directories (!-d) then pass the request onto index.php. This way, WordPress will handle both customized URLs (such as those used for SEO) and also 404 File Not Found errors.

If you set up a password protected folder in a directory included in a WordPress install, all of a sudden WordPress takes over that folder and returns a 404 page, like the file doesn’t exist.

This happens because of a little ‘gotcha’ in the apache configuration. Luckily it is an easy fix.

In the password protected folder’s .htaccess file, you may already have the entries to ask for password access. Before all of that, place the following line:

ErrorDocument 401 /401.html

Then create a 401.html in the main folder, with any text, for example:

PASSWORD PROTECTED FOLDER - Please enter the correct username/password.

Voila, you can now enter your password protected folder again.

There is another workaround this little error, but since it involves editing the main wordpress .htaccess file, it can be overridden during an upgrade.

Solution found on: http://www.webmasterworld.com/apache/3688208.htm