![]() The attacker crafts an HTTP request that contains the below headers: ![]() ![]() Many are concerned because the Shellshock vulnerability is very easy to exploit through web applications running on vulnerable servers as shown in the following example. Exploiting Shellshock Vulnerability Using HTTP Requests A similar bug with identical consequences was discovered by Tavis Ormandy and was assigned the CVE identifier CVE-2014-7169. The shellshock vulnerability, discovered by Stephane Chazelas was assigned the CVE identifier CVE-2014-6271. Since the environment variables are not sanitized properly by Bash before being executed, the attacker can send commands to the server through HTTP requests and get them executed by the web server operating system. Even though Bash is not an internet-facing service, many internet and network services such as web servers use environment variables to communicate with the server’s operating system. #Shellshock live paper codeIn other words if exploited the vulnerability allows the attacker to remotely issue commands on the server, also known as remote code execution. Shellshock is a security bug causing Bash to execute commands from environment variables unintentionally. What is the Shellshock Remote Code Execution Vulnerability? It gained so much popularity from the fact that the vulnerability is found in Unix Bash shell, which can be found on almost every Unix / Linux based web server, server and network device. ![]() Shellshock is the latest vulnerability that most probably will be as popular if not more than the Heartbleed vulnerability, hence it is already being widely exploited via a worm called wopbot. ![]()
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