IOS devices can be protected using different types of passwords, depending on the type of access. Each password you configure should be complex and unique. The following passwords can be used on an IOS device:
Several types of passwords can be configured on a Cisco router, such as the enable password, the secret password for Telnet and SSH connections and the console port as well. All these password locations represent good access locations for passwords, but if you have only one password on only one access location, you should at least have an. May 05, 2016 Cracking the Cisco telnet password on a Cisco 2960 switch is very easy when you are using the hydra password cracking tool. I used this command to crack the telnet login. Hydra -P password.lst 10.42.0.87 cisco. This is the password cracking session that resulted in me cracking the telnet login.
1. console password – by default, the console access does not require a password, so anyone with the phyical access to the device can acces the CLI. To configure a console password, use the following commands:
After the console password has been set, users will be forced enter the password to access the device through the console port:
2. telnet password – the telnet access to an IOS device is disabled by default. You can enable it and require a password for telnet access using the following set of commands:
After the telnet password has been set, users accessing devices using telnet will be forced to provide the password:
3. aux password – many Cisco devices have an auxiliary (AUX) port that can be used for remote router management via modem. You can require users to enter the password before accessing the device this way:
4. enable mode password – you can configure an IOS device to require a password before entering the enable mode. This can prevent an unauthorized user from entering the global configuration mode and changing the configuration of the device. The configured password will be stored in encypted form. Here is the command:
The user will be prompted to provide the password when trying to access the enable mode:
Encrypt passwords
Note that all passwords on an IOS device, with the exception of the enable secret password, are stored in clear-text in the configuration files:
You can use the service password-encryption global configuration command to encypt the passwords:
Now, the passwords are stored in encrypted form:
Note that the method of password encryption used with the service password-encryption command is not considered to be especially secure, since it can be easily cracked. You should use the service-password encryption command with additional security measures.
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