In this article, I'll illustrate how to achieve a password "reset" on your Cisco Asa security appliance. The more ordinarily used term for this course is "password recovery" which is left over from the days when you could of course view passwords in configuration files in plain text. Today, such passwords are encrypted and not of course recoverable. Instead, you will gain way to the appliance via the console port and reset the password(s) to known values.
This course requires corporeal way to the device. You will power-cycle your appliance by unplugging it at the power strip and plugging it back in. You will then interrupt the boot process and convert the configuration register value to forestall the appliance from reading its stored configuration at boot. Since the gismo ignores its saved configuration on boot, you are able to way its configuration modes without passwords. Once you're in configuration mode, you will load the saved configuration from flash memory, convert the passwords to a known value, convert the configuration register value to tell the gismo to load its saved configuration on boot, and reload the device.
SECURITY
Caution: As with all configuration procedures, these procedures should be tested in a laboratory environment prior to usage in a production environment to ensure suitability for your situation.
The following steps were designed using a Cisco Asa 5505 Security Appliance. They are not approved for a Cisco Pix Firewall appliance.
1. Power-cycle your security appliance by removing and re-inserting the power plug at the power strip.
2. When prompted, press Esc to interrupt the boot process and enter Rom Monitor mode. You should immediately see a rommon prompt (rommon #0>).
3. At the rommon prompt, enter the confreg command to view the current configuration register setting: rommon #0>confreg
4. The current configuration register should be the default of 0x01 (it will of course display as 0x00000001). The security appliance will ask if you want to make changes to the configuration register. Write back no when prompted.
5. You must convert the configuration register to 0x41, which tells the appliance to ignore its saved (startup) configuration upon boot: rommon #1>confreg 0x41
6. Reset the appliance with the boot command: rommon #2>boot
7. Notice that the security appliance ignores its startup configuration during the boot process. When it finishes booting, you should see a generic User Mode prompt: ciscoasa>
8. Enter the enable command to enter Privileged Mode. When the appliance prompts you for a password, plainly press (at this point, the password is blank): ciscoasa>enable Password: ciscoasa#
9. Copy the startup configuration file into the running configuration with the following command: ciscoasa#copy startup-config running-config Destination filename [running-config]?
10. The previously saved configuration is now the active configuration, but since the security appliance is already in Privileged Mode, privileged way is not disabled. Next, in configuration mode, enter the following command to convert the Privileged Mode password to a known value (in this case, we'll use the password system): asa#conf t asa(config)#enable password system
11. While still in Configuration Mode, reset the configuration register to the default of 0x01 to force the security appliance to read its startup configuration on boot: asa(config)#config-register 0x01
12. Use the following commands to view the configuration register setting: asa(config)#exit asa#show version
13. At bottom of the production of the show version command, you should see the following statement: Configuration register is 0x41 (will be 0x1 at next reload)
14. Save the current configuration with the copy run start command to make the above changes persistent: asa#copy run start Source filename [running-config]
15. Reload the security appliance: asa# reload law config has been modified. Save? [Y]es/[N]o:yes
Cryptochecksum: e87f1433 54896e6b 4e21d072 d71a9cbf
2149 bytes copied in 1.480 secs (2149 bytes/sec) strike for home with reload? [confirm]
When your security appliance reloads, you should be able to use your newly reset password to enter privileged mode.
Copyright (c) 2007 Don R. Crawley
Password recovery on the Cisco Asa safety Appliance SECURITY