- Bronze, 100 points or more
Password Recovery Procedure
To recover passwords for the ASA, perform the following steps:
Step 1 Connect to the ASA console port according to the instructions in "Accessing the Command-Line Interface" section.
Step 2 Power off the ASA, and then power it on.
Step 3 After startup, press the Escape key when you are prompted to enter ROMMON mode.
Step 4 To update the configuration register value, enter the following command:
rommon #1> confreg 0x41
Update Config Register (0x41) in NVRAM...
Step 5 To set the ASA to ignore the startup configuration, enter the following command:
rommon #1> confreg
The ASA displays the current configuration register value, and asks whether you want to change it:
Current Configuration Register: 0x00000041
boot default image from Flash
ignore system configuration
Do you wish to change this configuration? y/n [n]: y
Step 6 Record the current configuration register value, so you can restore it later.
Step 7 At the prompt, enter Y to change the value.
The ASA prompts you for new values.
Step 8 Accept the default values for all settings. At the prompt, enter Y.
Step 9 Reload the ASA by entering the following command:
rommon #2> boot
Boot configuration file contains 1 entry.
Loading disk0:/asa800-226-k8.bin... Booting...Loading...
The ASA loads the default configuration instead of the startup configuration.
Step 10 Access the privileged EXEC mode by entering the following command:
Step 11 When prompted for the password, press Enter.
The password is blank.
Step 12 Load the startup configuration by entering the following command:
hostname# copy startup-config running-config
Step 13 Access the global configuration mode by entering the following command:
hostname# configure terminal
Step 14 Change the passwords, as required, in the default configuration by entering the following commands:
hostname(config)# password password
hostname(config)# enable password password
hostname(config)# username name password password
Step 15 Load the default configuration by entering the following command:
hostname(config)# no config-register
The default configuration register value is 0x1.
Step 16 Save the new passwords to the startup configuration by entering the following command:
hostname(config)# copy running-config startup-config
Disabling Password Recovery
You might want to disable password recovery to ensure that unauthorized users cannot use the password recovery mechanism to compromise the ASA.
On the ASA, the no service password-recovery command prevents a user from entering ROMMON mode with the configuration intact. When a user enters ROMMON mode, the ASA prompts the user to erase all Flash file systems. The user cannot enter ROMMON mode without first performing this erasure. If a user chooses not to erase the Flash file system, the ASA reloads. Because password recovery depends on using ROMMON mode and maintaining the existing configuration, this erasure prevents you from recovering a password. However, disabling password recovery prevents unauthorized users from viewing the configuration or inserting different passwords. In this case, to restore the system to an operating state, load a new image and a backup configuration file, if available.