I am going to demonstrate two ways in which we will crack the user credentials using John the Ripper.
So, before diving in, we need to know what a shadow file is.
A shadow password file, also known as /etc/shadow, is a system file in Linux that stores encrypted user passwords and is accessible only to the root user, preventing unauthorized users or malicious actors from breaking into the system.
Now for the First method, I am going to crack the credentials of a particular user “EthicalEmpire”
Command as follows – “john –wordlist=/usr/share/wordlists/rockyou.txt –format=crypt EthicalEmpire”
I will now collectively crack all of the users’ credentials for the second method.
We will need to use John the Ripper’s “unshadow” utility to accomplish this and also the “/etc/passwd” file; which is used to keep track of every registered user that has access to a system.
Command as Follow – “john -w=/usr/share/wordlists/rockyou.txt -form=crypt unshadowed.txt”
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