This module scans for the Shellshock vulnerability, a flaw in how the Bash shell handles external environment variables. This module targets CGI scripts in the Apache web server by setting the HTTP_USER_AGENT environment variable to a malicious function definition. PROTIP: Use exploit/multi/handler with a PAYLOAD appropriate to your CMD, set ExitOnSession false, run -j, and then run this module to create sessions on vulnerable hosts. Note that this is not the recommended method for obtaining shells. If you require sessions, please use the apache_mod_cgi_bash_env_exec exploit module instead.
To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':
msf > use auxiliary/scanner/http/apache_mod_cgi_bash_env
msf auxiliary(apache_mod_cgi_bash_env) > show actions
...actions...
msf auxiliary(apache_mod_cgi_bash_env) > set ACTION < action-name >
msf auxiliary(apache_mod_cgi_bash_env) > show options
...show and set options...
msf auxiliary(apache_mod_cgi_bash_env) > run
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– Jim O’Gorman | President, Offensive Security