sangjun

War Games/hack-ctf

[hackctf] Look at me

문제 소스 int __cdecl main(int argc, const char **argv, const char **envp) { int v3; // ST1C_4 setvbuf(stdout, 0, 2, 0); v3 = getegid(); setresgid(v3, v3, v3); look_at_me(); return 0; } _BYTE *look_at_me() { char v1; // [esp+0h] [ebp-18h] puts("Hellooooooooooooooooooooo"); return gets(&v1); } 보호기법 gdb-peda$ checksec CANARY : disabled FORTIFY : disabled NX : ENABLED PIE : disabled RELRO : Partial 문제 ..

War Games/hack-ctf

[hackctf] Beginner_Heap

문제 소스 void __fastcall __noreturn main(__int64 a1, char **a2, char **a3) { void *v3; // ST10_8 void *v4; // ST18_8 char s; // [rsp+20h] [rbp-1010h] unsigned __int64 v6; // [rsp+1028h] [rbp-8h] v6 = __readfsqword(0x28u); v3 = malloc(0x10uLL); *(_DWORD *)v3 = 1; *((_QWORD *)v3 + 1) = malloc(8uLL); v4 = malloc(0x10uLL); *(_DWORD *)v4 = 2; *((_QWORD *)v4 + 1) = malloc(8uLL); fgets(&s, 4096, stdin); s..

War Games/hack-ctf

[hackctf] RTL_Core

문제 소스 int __cdecl main(int argc, const char **argv, const char **envp) { char s; // [esp+Ch] [ebp-1Ch] setvbuf(_bss_start, 0, 2, 0); puts(&::s); printf("Passcode: "); gets(&s); if ( check_passcode((int)&s) == hashcode ) { puts(&byte_8048840); core(); } else { puts(&byte_8048881); } return 0; } int __cdecl check_passcode(int a1) { int v2; // [esp+8h] [ebp-8h] signed int i; // [esp+Ch] [ebp-4h] v2..

War Games/hack-ctf

[hackctf] Random Key

문제 소스 int __cdecl __noreturn main(int argc, const char **argv, const char **envp) { unsigned int v3; // eax int v4; // [rsp+0h] [rbp-10h] int v5; // [rsp+4h] [rbp-Ch] unsigned __int64 v6; // [rsp+8h] [rbp-8h] v6 = __readfsqword(0x28u); setbuf(_bss_start, 0LL); v4 = 0; v3 = time(0LL); srand(v3); v5 = rand(); puts("============================"); puts(asc_400948); puts("===========================..

War Games/hack-ctf

[hackctf] 1996

문제 소스 int __cdecl main(int argc, const char **argv, const char **envp) { __int64 v3; // rdx __int64 v4; // rax __int64 v5; // rdx __int64 v6; // rbx char *v7; // rax __int64 v8; // rdx __int64 v9; // rax char name; // [rsp+0h] [rbp-410h] std::operator(&std::cin, &name); v4 = std::operator

War Games/hack-ctf

[hackctf] Poet

문제 소스 int __cdecl __noreturn main(int argc, const char **argv, const char **envp) { setvbuf(_bss_start, 0LL, 2, 0LL); puts(s); while ( 1 ) { get_poem(); get_author(); rate_poem(); if ( dword_6024E0 == 0xF4240 ) break; puts(asc_400D78); } reward(); } __int64 get_author() { printf(&byte_400C38); return gets((__int64)&unk_6024A0); } void __noreturn reward() { char s; // [rsp+0h] [rbp-90h] FILE *str..