Wargame/Dreamhack

tcache_dup

// gcc -o tcache_dup tcache_dup.c -no-pie #include #include #include #include char *ptr[10]; void alarm_handler() { exit(-1); } void initialize() { setvbuf(stdin, NULL, _IONBF, 0); setvbuf(stdout, NULL, _IONBF, 0); signal(SIGALRM, alarm_handler); alarm(60); } int create(int cnt) { int size; if(cnt > 10) { return -1; } printf("Size: "); scanf("%d", &size); ptr[cnt] = malloc(size); if(!ptr[cnt]) {..

Tcache Poisoning

// Name: tcache_poison.c // Compile: gcc -o tcache_poison tcache_poison.c -no-pie -Wl,-z,relro,-z,now #include #include #include int main() { void *chunk = NULL; unsigned int size; int idx; setvbuf(stdin, 0, 2, 0); setvbuf(stdout, 0, 2, 0); while (1) { printf("1. Allocate\n"); printf("2. Free\n"); printf("3. Print\n"); printf("4. Edit\n"); scanf("%d", &idx); switch (idx) { case 1: printf("Size: ..

uaf_overwrite

// Name: uaf_overwrite.c // Compile: gcc -o uaf_overwrite uaf_overwrite.c #include #include #include #include struct Human { char name[16]; int weight; long age; }; struct Robot { char name[16]; int weight; void (*fptr)(); }; struct Human *human; struct Robot *robot; char *custom[10]; int c_idx; void print_name() { printf("Name: %s\n", robot->name); } void menu() { printf("1. Human\n"); printf("..

basic_exploitation_003

#include #include #include #include void alarm_handler() { puts("TIME OUT"); exit(-1); } void initialize() { setvbuf(stdin, NULL, _IONBF, 0); setvbuf(stdout, NULL, _IONBF, 0); signal(SIGALRM, alarm_handler); alarm(30); } void get_shell() { system("/bin/sh"); } int main(int argc, char *argv[]) { char *heap_buf = (char *)malloc(0x80); char stack_buf[0x90] = {}; initialize(); read(0, heap_buf, 0x80..

basic_exploitation_002

#include #include #include #include void alarm_handler() { puts("TIME OUT"); exit(-1); } void initialize() { setvbuf(stdin, NULL, _IONBF, 0); setvbuf(stdout, NULL, _IONBF, 0); signal(SIGALRM, alarm_handler); alarm(30); } void get_shell() { system("/bin/sh"); } int main(int argc, char *argv[]) { char buf[0x80]; initialize(); read(0, buf, 0x80); printf(buf); exit(0); } 32 bit format string bug 문제이..

out_of_bound

#include #include #include #include #include char name[16]; char *command[10] = { "cat", "ls", "id", "ps", "file ./oob" }; void alarm_handler() { puts("TIME OUT"); exit(-1); } void initialize() { setvbuf(stdin, NULL, _IONBF, 0); setvbuf(stdout, NULL, _IONBF, 0); signal(SIGALRM, alarm_handler); alarm(30); } int main() { int idx; initialize(); printf("Admin name: "); read(0, name, sizeof(name)); p..

oneshot

// gcc -o oneshot1 oneshot1.c -fno-stack-protector -fPIC -pie #include #include #include #include void alarm_handler() { puts("TIME OUT"); exit(-1); } void initialize() { setvbuf(stdin, NULL, _IONBF, 0); setvbuf(stdout, NULL, _IONBF, 0); signal(SIGALRM, alarm_handler); alarm(60); } int main(int argc, char *argv[]) { char msg[16]; size_t check = 0; initialize(); printf("stdout: %p\n", stdout); pr..

hook

// gcc -o init_fini_array init_fini_array.c -Wl,-z,norelro #include #include #include #include void alarm_handler() { puts("TIME OUT"); exit(-1); } void initialize() { setvbuf(stdin, NULL, _IONBF, 0); setvbuf(stdout, NULL, _IONBF, 0); signal(SIGALRM, alarm_handler); alarm(60); } int main(int argc, char *argv[]) { long *ptr; size_t size; initialize(); printf("stdout: %p\n", stdout); printf("Size:..

fho

// Name: fho.c // Compile: gcc -o fho fho.c #include #include #include int main() { char buf[0x30]; unsigned long long *addr; unsigned long long value; setvbuf(stdin, 0, _IONBF, 0); setvbuf(stdout, 0, _IONBF, 0); puts("[1] Stack buffer overflow"); printf("Buf: "); read(0, buf, 0x100); printf("Buf: %s\n", buf); puts("[2] Arbitary-Address-Write"); printf("To write: "); scanf("%llu", &addr); printf..

basic_rop_x86

#include #include #include #include void alarm_handler() { puts("TIME OUT"); exit(-1); } void initialize() { setvbuf(stdin, NULL, _IONBF, 0); setvbuf(stdout, NULL, _IONBF, 0); signal(SIGALRM, alarm_handler); alarm(30); } int main(int argc, char *argv[]) { char buf[0x40] = {}; initialize(); read(0, buf, 0x400); write(1, buf, sizeof(buf)); return 0; } 32bit rop 문제이다. 앞선 문제에서 설명한 것과 같이 64 bit와의 차이는..