LEVEL8 (orge -> troll) : check argc
troll.c #include #include extern char **environ; main(int argc, char *argv[]) { char buffer[40]; int i; // here is changed if(argc != 2){ printf("argc must be two!\n"); exit(0); } // egghunter for(i=0; environ[i]; i++) memset(environ[i], 0, strlen(environ[i])); if(argv[1][47] != '\xbf') { printf("stack is still your friend.\n"); exit(0); } // check the length of argument if(strlen(argv[1]) > 48)..
LEVEL7 (darkelf -> orge) : check argv[0]
orge.c #include #include extern char **environ; main(int argc, char *argv[]) { char buffer[40]; int i; if(argc < 2){ printf("argv error\n"); exit(0); } // here is changed! if(strlen(argv[0]) != 77){ printf("argv[0] error\n"); exit(0); } // egghunter for(i=0; environ[i]; i++) memset(environ[i], 0, strlen(environ[i])); if(argv[1][47] != '\xbf') { printf("stack is still your friend.\n"); exit(0); }..
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