viernes, 6 de noviembre de 2009

Recuperación de contraseñas en Cisco ASA 5500

Página oficial de Cisco

El paso 14 de la guía oficial es incorrecto, el correcto es este.

Performing Password Recovery for the ASA 5500 Series Adaptive Security Appliance

To recover from the loss of passwords, perform the following steps:

Step 1 Connect to the security appliance console port according to the "Accessing the Command-Line Interface".

Step 2 Power off the security appliance, and then power it on.

Step 3 During the startup messages, press the Escape key when prompted to enter ROMMON.

Step 4 To set the security appliance to ignore the startup configuration at reload, enter the following command:

rommon #1> confreg

The security appliance displays the current configuration register value, and asks if you want to change the value:

Current Configuration Register: 0x00000011
Configuration Summary:
  boot TFTP image, boot default image from Flash on netboot failure
Do you wish to change this configuration? y/n [n]:

Step 5 Record your current configuration register value, so you can restore it later.

Step 6 At the prompt, enter Y to change the value.

The security appliance prompts you for new values.

Step 7 Accept the default values for all settings, except for the "disable system configuration?" value; at that prompt, enter Y.

Step 8 Reload the security appliance by entering the following command:

rommon #2> boot

The security appliance loads a default configuration instead of the startup configuration.

Step 9 Enter privileged EXEC mode by entering the following command:

hostname> enable

Step 10 When prompted for the password, press Return.

The password is blank.

Step 11 Load the startup configuration by entering the following command:

hostname# copy startup-config running-config

Step 12 Enter global configuration mode by entering the following command:

hostname# configure terminal

Step 13 Change the passwords in the configuration by entering the following commands, as necessary:

hostname(config)# password password
hostname(config)# enable password password
hostname(config)# username name password password

Step 14 Change the configuration register to load the startup configuration at the next reload by entering the following command:

hostname(config)# config-register 0x10011

Where value is the configuration register value you noted in Step 5. 0×1 is the default configuration register. For more information about the configuration register, see the Cisco Security Appliance Command Reference.

Step 15 Save the new passwords to the startup configuration by entering the following command:

hostname(config)# copy running-config startup-config