목록wargame/Protostar (23)
FINAL 2번
#include "../common/common.c" #include "../common/malloc.c" #define NAME "final2" #define UID 0 #define GID 0 #define PORT 2993 #define REQSZ 128 void check_path(char *buf) { char *start; char *p; int l; /* * Work out old software bug */ p = rindex(buf, '/'); l = strlen(p); if(p) { start = strstr(buf, "ROOT"); if(start) { while(*start != '/') start--; memmove(start, p, l); printf("moving from %p..
FINAL 1번
#include "../common/common.c" #include #define NAME "final1" #define UID 0 #define GID 0 #define PORT 2994 char username[128]; char hostname[64]; void logit(char *pw) { char buf[512]; snprintf(buf, sizeof(buf), "Login from %s as [%s] with password [%s]\n", hostname, username, pw); syslog(LOG_USER|LOG_DEBUG, buf); } void trim(char *str) { char *q; q = strchr(str, '\r'); if(q) *q = 0; q = strchr(s..
FINAL 0번
#include "../common/common.c" #define NAME "final0" #define UID 0 #define GID 0 #define PORT 2995 char *get_username() { char buffer[512]; char *q; int i; memset(buffer, 0, sizeof(buffer)); gets(buffer); /* Strip off trailing new line characters */ q = strchr(buffer, '\n'); if(q) *q = 0; q = strchr(buffer, '\r'); if(q) *q = 0; /* Convert to lower case */ for(i = 0; i < strlen(buffer); i++) { buf..
NET 2번
#include "../common/common.c" #define NAME "net2" #define UID 997 #define GID 997 #define PORT 2997 void run() { unsigned int quad[4]; int i; unsigned int result, wanted; result = 0; for(i = 0; i < 4; i++) { quad[i] = random(); result += quad[i]; if(write(0, &(quad[i]), sizeof(result)) != sizeof(result)) { errx(1, ":(\n"); } } if(read(0, &wanted, sizeof(result)) != sizeof(result)) { errx(1, ":
NET 1번
#include "../common/common.c" #define NAME "net1" #define UID 998 #define GID 998 #define PORT 2998 void run() { char buf[12]; char fub[12]; char *q; unsigned int wanted; wanted = random(); sprintf(fub, "%d", wanted); if(write(0, &wanted, sizeof(wanted)) != sizeof(wanted)) { errx(1, ":(\n"); } if(fgets(buf, sizeof(buf)-1, stdin) == NULL) { errx(1, ":(\n"); } q = strchr(buf, '\r'); if(q) *q = 0; ..
NET 0번
#include "../common/common.c" #define NAME "net0" #define UID 999 #define GID 999 #define PORT 2999 void run() { unsigned int i; unsigned int wanted; wanted = random(); printf("Please send '%d' as a little endian 32bit int\n", wanted); if(fread(&i, sizeof(i), 1, stdin) == NULL) { errx(1, ":(\n"); } if(i == wanted) { printf("Thank you sir/madam\n"); } else { printf("I'm sorry, you sent %d instead..
Heap 3번
#include #include #include #include #include void winner() { printf("that wasn't too bad now, was it? @ %d\n", time(NULL)); } int main(int argc, char **argv) { char *a, *b, *c; a = malloc(32); b = malloc(32); c = malloc(32); strcpy(a, argv[1]); strcpy(b, argv[2]); strcpy(c, argv[3]); free(c); free(b); free(a); printf("dynamite failed?\n"); } DFB의 취약점을 이용한다. free가 된 영역들은 자기들끼리 double link로 연결되어 있..
Heap 2번
#include #include #include #include #include struct auth { char name[32]; int auth; }; struct auth *auth; char *service; int main(int argc, char **argv) { char line[128]; while(1) { printf("[ auth = %p, service = %p ]\n", auth, service); if(fgets(line, sizeof(line), stdin) == NULL) break; if(strncmp(line, "auth ", 5) == 0) { auth = malloc(sizeof(auth)); memset(auth, 0, sizeof(auth)); if(strlen(l..