Tuesday, 14 August 2012

Cracking Unix Password On Backtrack 5

Cracking Unix Password
Cracking Unix Password
  • After getting a open session, use the 'ls command ' to see the directories .
  • Command Used : lsimage 
  • See the below image , it show the various directories of remote system (metasploitable)- 
Passwd File

  • Password File shows the User Account Information.
  • The next step is to open a 'passwd' using cat command .
  • Command Used : cat /etc/passwd
  • As you enter the command , below you see the all the account of remote system (metasploit).
  • Do one more thing make a copy of passwd file and save anywhere in my case i open  my password file in vim editor and save as a passwordfile.txt .
  • Now few things to remember - 
  1. ' In this line >> root : x:0:0:root:/root:/bin/bash 
  2. Here 'x' means password which is encrypted and stored in /ctc/shadow  file with other information such as account and password expiration information . 
  3. '0' means root account and another '0' means groupID .
  4. 'root' in this we can find extra information.( but here no extra information display ).
  5. 'root '  it is the user home directory 
  6. /bin/bash - It show the user shell account .
  • See the below image to understand more clearly-

Passwd File

Shadow File 

  • Shadow file shows the secure user account information.
  • To view shadow file use the command given below .
  • Command Used : cat  /etc/shadow 
  • This command show you the shadow file . 
  • Also copy the shadow file and give a output name as shadowfile.txt and save it on the home directory.
  • Now Things to remember - 
  1. In the root account : root :$1$/avpfBJ1$x0z8w5UF9Iv./DR9E9Lid.:14747:0:99999:7: ::
  2. Here 'root' is the username which show match to the /etc/passwd file .
  3. $1$ : means MD5 encryption is used .
  4. avpfBJ1$x0z8w5UF9Iv./DR9E9Lid is your encrypted password.
  5. 14747 : tells the last password changed (last changed).
  6. '0' tells the  minimum number of days left before the user s allowed to change password.
  7. 99999 : show maximam number of days the password is valid .
  8. And on other account you can see the ' * '. It  means the account is disabled.
  • See the below image for more details - 

Shadow File


  • Now open ' John the Ripper ' .
  • Using 'John the Ripper' we are going to crack the hashes.
  • To open John the Ripper , follow the given path -
  • BackTrack > Priviledge Escalation > Password Attack > Offline Attack > john the ripper 
  • See the below image for more details - 

John the ripper

  • Here is 'john the ripper'.
  • See the below image for more details - 


  • Now select and copy your 'passwordfile.txt' and 'shadowfile.txt ' and save it to the 'John the Ripper ' directory , which is under Root > pentest > passwords > john 


  • Under the john directory paste your both files( passwordfile.txt & shadowfile.txt ) .
  • See the below image for more details -

paste files


  • Now check for both the file , is it in the john directory or not .
  • Command Used : ls
  • See the below image both the file are there - 

ls command


  • In the below image , see the utility named unshadow , now before crack we have to use it to make shadow file readable . 
  • Now one more you have to do is making 1 output file named : Crackedfile.txt using the below command-
  • Command Used : ./unshadow passwordfile.txt shadowfile.txt > Crackedfile.txt
  • Use 'ls' command to see your Crackedfile.txt -
unshadow command


  • Using john the ripper crack the hashes .
  • Command Used : ./john Crackedfile.txt
  • See the below image for more details -

start john the ripper

For Passwords
  • To see passwords enter the command .
  • Command Used: ./john --show Crackedfile.txt
  • See the below image for more details -







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