Bash Environment Variables Remote Code Execution Exploit for SSH (CVE-2014-6278)

A vulnerability in GNU Bash when processing trailing strings after function definitions in the values of environment variables allows remote attackers to execute arbitrary code via a crafted environment. This vulnerability can be leveraged to bypass restricted SSH access (i.e. when the SSH server forces the execution of a specific command, ignoring any command supplied by the client, either by specifying a 'ForceCommand' directive in the 'sshd_config' file, or by using the 'command' keyword in the 'authorized_keys' file) when the default shell for the user is Bash, allowing the remote attacker to execute arbitrary commands on the vulnerable system.