CVE-2017-11401 Explained : Impact and Mitigation

A vulnerability has been identified in the Belden Hirschmann Tofino Xenon Security Appliance prior to version 03.2.00, allowing attackers to bypass function code filtering.

Understanding CVE-2017-11401

This CVE involves improper handling of ModBus packets in the ModBus DPI filter of the Belden Hirschmann Tofino Xenon Security Appliance.

What is CVE-2017-11401?

The vulnerability in the ModBus DPI filter allows attackers to send manipulated packets to a secured asset, circumventing function code filtering.

The Impact of CVE-2017-11401

This vulnerability could be exploited by attackers to send crafted packets to protected assets, potentially leading to unauthorized access or disruption of critical functions.

Technical Details of CVE-2017-11401

The technical aspects of this CVE are as follows:

Vulnerability Description

The ModBus DPI filter in the Belden Hirschmann Tofino Xenon Security Appliance mishandles the mbap.length field of ModBus packets.

Affected Systems and Versions

Belden Hirschmann Tofino Xenon Security Appliance versions prior to 03.2.00 are affected.

Exploitation Mechanism

Attackers can exploit this vulnerability by sending manipulated ModBus packets to bypass function code filtering.

Mitigation and Prevention

To address CVE-2017-11401, consider the following steps:

Immediate Steps to Take

Update the Belden Hirschmann Tofino Xenon Security Appliance to version 03.2.00 or later.
Monitor network traffic for any signs of malicious activity.

Long-Term Security Practices

Regularly review and update security configurations on network devices.
Conduct security training for personnel to recognize and respond to potential threats.

Patching and Updates

Stay informed about security bulletins and advisories from Belden.
Implement a robust patch management process to promptly apply security updates.