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John the Ripper Linux Password Cracker

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John the Ripper Linux Password Cracker



This module uses John the Ripper to identify weak passwords that have been acquired from unshadowed passwd files from Unix systems. The module will only crack MD5, BSDi and DES implementations by default. Set Crypt to true to also try to crack Blowfish and SHA(256/512). Warning: This is much slower.


  • theLightCosine <theLightCosine@metasploit.com>
  • hdm <x@hdm.io>


Module Options

To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':

msf > use auxiliary/analyze/jtr_linux
msf auxiliary(jtr_linux) > show actions
msf auxiliary(jtr_linux) > set ACTION < action-name >
msf auxiliary(jtr_linux) > show options
    ...show and set options...
msf auxiliary(jtr_linux) > run 

Time is precious, so I don’t want to do something manually that I can automate. Leveraging the Metasploit Framework when automating any task keeps us from having to re-create the wheel as we can use the existing libraries and focus our efforts where it matters.

– Jim O’Gorman | President, Offensive Security