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Summary
‘Deep Freeze ‘makes computing environments easier to manage and maintain. Each restart eradicates all changes and resets the computer to its original state, right down to the last byte’.
Credit:
‘The information has been provided by Emiliano Torres.
The original article can be found at: http://usuarios.arnet.com.ar/fliamarconato/‘
Details
‘Vulnerable Systems:
* Deep Freeze versions 5.20.* and 5.30.*
* Deep Freeze versions 3.32.*
Immune Systems:
* DeepFreeze version 5.5
Tools needed:
Ollydgb to patch the program and run it.
OllyScript to run scripts on Ollydgb.
ASPack 2.12 OEP finder script by hacnho/VCT2k4 to find the OEP.
Process Explorer for 2K/XP to see the login program command line.
DeASPack for AsPack 2.11 to unpack the login program. (for Deep Freeze 3.32.000.0534)
Summary:
What we are going to do is to load a new instance of Deep Freeze login program and we’ll change it in such a way that it will accept any password as a valid one.
Let’s get to work:
1. The first thing we are going to do is finding some data we’re going to use later to load our login program instance. To do that load Process Explorer. In this program we can see a list of all the processes our PC is running, among them is the login program called FrzState.exe or FrzState2k.exe. Find this program on the list, expanding the tree if necessary. Once you’ve found it, right click over the program’s name and a menu with options will show up. Select the option ‘Properties’. A window will show up with the process properties.
2. In the properties window you’ll see a property called ‘Command line’. On this box you can see the program’s location, remember that. At the end of the text box there are three numbers that you have to write down to use later. Once you’ve written them down you can close Process Explorer.
Deep Freeze for Windows 2K/XP
3. Now run Ollydbg. Note: Make sure OllyScript is properly installed. There should be a menu called ‘Plugins’ where you’ll find a submenu called ‘OllyScript’. If this menu doesn’t appear in the program, that means you haven’t installed the plugin properly. To install it, go to the menu ‘Options’ and select ‘Appearance’. In the ‘Plugin path’ box write the address where you copied OllyScript files, press OK and restart the program.
On the menu ‘File’ select ‘Open’ and look for the login program file (remember that Process Explorer told you where it was). In the ‘Arguments’ box write the three numbers you’ve written down. Now click ‘Open’. If a warning message box shows up press ‘OK’, and if later a message box ask you if you want to continue the code analysis press ‘No’.
4. We have loaded the program, the problem is that it’s protected with Aspack 2.12 and we can’t see the real code. To solve this we’re going to use OllyScript and the ASPack 2.12 OEP finder script. Go to the ‘Plugins’ menu, and then to the ‘OllyScript’ submenu and select ‘Run script’.
5. Look for the script and open it. The script will find the OEP (original entry point). If any window shows up dismiss it. Note: We are now on the OEP. If you are an experienced user you can dump the program using OllyDump to analyze the code with a disassembler.
6. Deep Freeze can be configured to hide the system tray icon (next to the clock). If you can’t see the Deep Freeze icon follow the steps on this Annex and then resume this tutorial.
7. Right click over the code and a context menu will appear, select ‘Go to’ and then ‘Expression’ (or use the shortcut Ctrl+G).
8. In the text box enter the following value according to the Deep Freeze version you have installed and press OK.
Version Value
4.20.020.0598 40368D
4.20.120.0598 40368D
4.20.121.0613 4034F5
5.20.220.1125 4037E9
5.30.120.1181 4037E9
The program will jump to that line of code.
9. This is the line from where the password verification procedure is called. Let’s set a breakpoint here. To do that right click over the line and in the context menu select ‘Breakpoint’ and then ‘Toggle’ (or press F2).
10. We are almost done! Now let’s run this new Deep Freeze login program instance. To do that press F9. If everything went right now you should see two Deep Freeze icons on the system tray next to the clock. If Deep Freeze was configured to hide it (read annex), instead of two icons you’ll see an empty icon.
Note: If the icon doesn’t show up is possible that you haven’t written the argument three numbers correctly or that you haven’t opened the right file.
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11. Now activate the login program by double clicking over the icon while you keep the shift key pressed. If there are two icons, is important that you click over the new icon and not over the old one. The login window will appear asking for the password. Write anything in the password box and press ENTER. The breakpoint we set earlier in Ollydbg will activate and the login program will freeze.
Note: If the breakpoint doesn’t activate is possible that you’ve chosen the wrong icon. Try with the other one.
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12. On Ollydbg press F8 to step over the function call. On the registers window (to the right of the code) you’ll see that EAX register has the value 00000000. That means the password is incorrect, let’s change that. Double click over the value of EAX to open the modification window. In the ‘Hexadecimal’ text box write 1 and press OK.
13. Now press F9 to continue. If everything went right the Deep Freeze configuration dialog will show up.
Deep Freeze 5.20.250.1125 and 5.30.150.1181 (Windows 9X):
3. Now we’re going to kill the login program. Pycharm activation code 2019 pdf. If you try to close it now you’ll see that the process shows up again on the list. To close it for good we first have to kill the process called MSGSRV32.EXE. Look for this process on the list, then right click over it and select ‘Kill Process’. If a confirmation message appears answer Yes. Next, right click over the process FrzState9X.exe and select ‘Kill Process’ again. Now the login program should be dead. Note: If the icon of Deep Freeze still remains on the system tray next to the clock, hover the mouse cursor over it to make it disappear.
4. Now run Ollydbg. Note: Make sure OllyScript is properly installed. There should be a menu called ‘Plugins’ where you’ll find a submenu called ‘OllyScript’. If this menu doesn’t appear in the program, that means you haven’t installed the plugin properly. To install it, go to the menu ‘Options’ and select ‘Appearance’. In the ‘Plugin path’ box write the address where you copied OllyScript files, press OK and restart the program. On the menu ‘File’ select ‘Open’ and look for the login program file (remember that Process Explorer told you where it was). Now click ‘Open’. If a warning message box shows up press ‘OK’, and if later a message box ask you if you want to continue the code analysis press ‘No’.
5. We have loaded the program, the problem is that it’s protected with Aspack 2.12 and we can’t see the real code. To solve this we’re going to use OllyScript and the ASPack 2.12 OEP finder script. Go to the ‘Plugins’ menu, and then to the ‘OllyScript’ submenu and select ‘Run script’.
6. Look for the script and open it. The script will find the OEP (original entry point). If any window shows up dismiss it. Note: We are now on the OEP. If you are an experienced user you can dump the program using OllyDump to analyze the code with a disassembler.
7. Right click over the code and a context menu will appear, select ‘Go to’ and then ‘Expression’ (or use the shortcut Ctrl+G).
8. In the text box enter the following value according to the Deep Freeze version you have installed and press OK.
Version Value
5.20.250.1125 408D34
5.30.150.1181 408E08
The program will jump to that line of code.
9. In this line the program decides if the password is correct. Let’s set a breakpoint here. To do that right click over the line and in the context menu select ‘Breakpoint’ and then ‘Toggle’ (or press F2).
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10. We are almost done! Now let’s run this new Deep Freeze login program instance. To do that press F9. If Deep Freeze is configured to show the icon, now you’ll see it on the system tray next to the clock.
11. Now activate the login program by double clicking over the icon while you keep the shift key pressed or by pressing CTRL+ALT+SHIFT+F6. The login window will appear asking for the password. Write anything in the password box and press ENTER. The breakpoint we set earlier in Ollydbg will activate and the login program will freeze.
12. On the registers window (to the right of the code) you’ll see that the Z flag is set to 1. That means the password is incorrect, let’s change that. Double click over the Z flag value and you’ll see it changes to 0.
13. Now press F9 to continue. If everything went right the Deep Freeze configuration dialog will show up.
Deep Freeze 3.32.000.0534 (Windows 9X):
3. Now we’re going to kill the login program. If you try to close it now you’ll see that the process shows up again on the list. To close it for good we first have to kill the process called MSGSRV32.EXE. Look for this process on the list, then right click over it and select ‘Kill Process’. If a confirmation message appears answer Yes. Next, right click over the process FrzState.exe and select ‘Kill Process’ again. Now the login program should be dead. Note: If the icon of Deep Freeze still remains on the system tray next to the clock, hover the mouse cursor over it to make it disappear.
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4. This version of Deep Freeze is protected with Aspack 2.11, so before we can work with the login program we have to unpack the file, and for that we are going to use DeASPack. Run DeASPack and a dialog box will show up and ask you to select a file to unpack. Look for the login program file (remember that Process Explorer told you where it was). Now click ‘Open’. The program will unpack the file and the dialog box will close.
5. Now run Ollydbg. On the menu ‘File’ select ‘Open’ and look for the unpacked file. The file is called out.exe and is in the same folder the login program is. Nex click ‘Open’.
6. When Ollydbg finish analyzing the program, right click over the code and a context menu will appear, select ‘Go to’ and then ‘Expression’ (or use the shortcut Ctrl+G).
7. In the text box enter 417410 and press OK. The program will jump to that line of code.
8. In this line the program decides if the password is correct. Let’s set a breakpoint here. To do that right click over the line and in the context menu select ‘Breakpoint’ and then ‘Toggle’ (or press F2).
9. We are almost done! Now let’s run this new Deep Freeze login program instance. To do that press F9. If Deep Freeze is configured to show the icon, now you’ll see it on the system tray next to the clock.
10. Now activate the login program by double clicking over the icon while you keep the shift key pressed or by pressing CTRL+ALT+SHIFT+F6. The login window will appear asking for the password. Write anything in the password box and press ENTER. The breakpoint we set earlier in Ollydbg will activate and the login program will freeze.
11. On the registers window (to the right of the code) you’ll see that the Z flag is set to 1. That means the password is incorrect, let’s change that. Double click over the Z flag value and you’ll see it changes to 0.
12. Now press F9 to continue. If everything went right the Deep Freeze configuration dialog will show up.
Vendor Response:
‘Faronics takes the security of our products very seriously and we began working on resolution to the password security issue as soon as we were made aware of it. We are happy to report that the issue was resolved on June 12, 2005 with a new Deep Freeze 5.5 release of the Standard, Professional, and Enterprise versions. In fact, the issue was already resolved before it was posted on the SecuriTeam site. We have already made all of our customers aware that the new version is available. If you are a Deep Freeze customer and have not received notification, you can request an update using the form at: http://www.faronics.com/html/updates.asp
It is important to note that the method described must be used on each workstation individually and the perpetrator would require physical access to the workstation; it will not work over a network.
It requires an industrious, knowledgeable user who can find, download, and use the utilities that are referred to in the tutorial. Even then, the procedure must be followed to the letter and will not work in all cases. In cases where it does work, the user has essentially fooled Deep Freeze into believing that a correct password has been entered on that one individual workstation. The user could then tell Deep Freeze to boot Thawed and would therefore be able to make a permanent change to that single computer. This has been resolved with the 5.5 release and the method will no longer function.”