[Pwnable.kr] echo2

by yiz96 02. 3 月 2016 pwnable writeup 0

FSB+UAF，比较常规的套路题

首先F5

int __cdecl main(int argc, const char **argv, const char **envp)
{
  unsigned int *v3; // rsi@1
  _QWORD *v4; // rax@1
  unsigned int v6; // [rsp+Ch] [rbp-24h]@1
  __int64 v7; // [rsp+10h] [rbp-20h]@1
  __int64 v8; // [rsp+18h] [rbp-18h]@1
  __int64 v9; // [rsp+20h] [rbp-10h]@1

  setvbuf(stdout, 0LL, 2, 0LL);
  setvbuf(stdin, 0LL, 1, 0LL);
  o = malloc(0x28uLL);
  *((_QWORD *)o + 3) = greetings;
  *((_QWORD *)o + 4) = byebye;
  printf("hey, what's your name? : ", 0LL);
  v3 = (unsigned int *)&v7;
  __isoc99_scanf((__int64)"%24s", (__int64)&v7);
  v4 = o;
  *(_QWORD *)o = v7;
  v4[1] = v8;
  v4[2] = v9;
  id = v7;
  getchar();
  func[0] = (__int64)echo1;
  qword_602088 = (__int64)echo2;
  qword_602090 = (__int64)echo3;
  v6 = 0;
  do
  {
    while ( 1 )
    {
      while ( 1 )
      {
        puts("\n- select echo type -");
        puts("- 1. : BOF echo");
        puts("- 2. : FSB echo");
        puts("- 3. : UAF echo");
        puts("- 4. : exit");
        printf("> ", v3);
        v3 = &v6;
        __isoc99_scanf((__int64)"%d", (__int64)&v6);
        getchar();
        if ( v6 > 3 )
          break;
        ((void (__fastcall *)(const char *, unsigned int *))func[(unsigned __int64)(v6 - 1)])("%d", &v6);
      }
      if ( v6 == 4 )
        break;
      puts("invalid menu");
    }
    cleanup();
    printf("Are you sure you want to exit? (y/n)", &v6);
    v6 = getchar();
  }
  while ( v6 != 121 );
  puts("bye");
  return 0;
}

__int64 echo2()
{
  char format; // [rsp+0h] [rbp-20h]@1

  (*((void (__fastcall **)(void *))o + 3))(o);
  get_input(&format, 32LL);
  printf(&format);
  (*((void (__fastcall **)(void *))o + 4))(o);
  return 0LL;
}

__int64 echo3()
{
  char *s; // ST08_8@1

  (*((void (__fastcall **)(void *))o + 3))(o);
  s = (char *)malloc(0x20uLL);
  get_input(s, 32LL);
  puts(s);
  free(s);
  (*((void (__fastcall **)(void *, signed __int64))o + 4))(o, 32LL);
  return 0LL;
}

int __cdecl main(int argc, const char **argv, const char **envp)

{

unsigned int *v3; // rsi@1

_QWORD *v4; // rax@1

unsigned int v6; // [rsp+Ch] [rbp-24h]@1

__int64 v7; // [rsp+10h] [rbp-20h]@1

__int64 v8; // [rsp+18h] [rbp-18h]@1

__int64 v9; // [rsp+20h] [rbp-10h]@1

setvbuf(stdout, 0LL, 2, 0LL);

setvbuf(stdin, 0LL, 1, 0LL);

o = malloc(0x28uLL);

*((_QWORD *)o + 3) = greetings;

*((_QWORD *)o + 4) = byebye;

printf("hey, what's your name? : ", 0LL);

v3 = (unsigned int *)&v7;

__isoc99_scanf((__int64)"%24s", (__int64)&v7);

v4 = o;

*(_QWORD *)o = v7;

v4[1] = v8;

v4[2] = v9;

id = v7;

getchar();

func[0] = (__int64)echo1;

qword_602088 = (__int64)echo2;

qword_602090 = (__int64)echo3;

v6 = 0;

{

while ( 1 )

{

while ( 1 )

{

puts("\n- select echo type -");

&nb