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Pure-FTPd External Authentication Bash Environment Variable Code Injection (Shellshock)

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Pure-FTPd External Authentication Bash Environment Variable Code Injection (Shellshock)

Disclosed
09/24/2014
Created
05/30/2018

Description

This module exploits the Shellshock vulnerability, a flaw in how the Bash shell handles external environment variables. This module targets the Pure-FTPd FTP server when it has been compiled with the --with-extauth flag and an external Bash script is used for authentication. If the server is not set up this way, the exploit will fail, even if the version of Bash in use is vulnerable.

Author(s)

  • Stephane Chazelas
  • Frank Denis
  • Spencer McIntyre

Development

References

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 exploit/multi/ftp/pureftpd_bash_env_exec
msf exploit(pureftpd_bash_env_exec) > show targets
    ...targets...
msf exploit(pureftpd_bash_env_exec) > set TARGET < target-id >
msf exploit(pureftpd_bash_env_exec) > show options
    ...show and set options...
msf exploit(pureftpd_bash_env_exec) > exploit

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

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