CVE-2021-39278 : Security Advisory and Response

This CVE involves certain MOXA devices being vulnerable to reflected XSS via the Config Import menu.

Understanding CVE-2021-39278

This section provides insights into the impact and technical details of the CVE.

What is CVE-2021-39278?

Certain MOXA devices are susceptible to reflected XSS through the Config Import menu.
Affected devices include WAC-2004, WAC-1001, OnCell G3470A-LTE-EU, TAP-323, and WDR-3124A models with specific versions.

The Impact of CVE-2021-39278

Attackers can exploit this vulnerability to execute malicious scripts in the context of a user's session, potentially leading to unauthorized actions or data theft.

Technical Details of CVE-2021-39278

This section delves into the vulnerability description, affected systems, and exploitation mechanism.

Vulnerability Description

The vulnerability allows for reflected XSS via the Config Import menu on certain MOXA devices.

Affected Systems and Versions

WAC-2004 1.7
WAC-1001 2.1
OnCell G3470A-LTE-EU 1.7
TAP-323 series
WDR-3124A series

Exploitation Mechanism

Attackers can craft malicious links that, when clicked by users, execute arbitrary scripts within the user's session.

Mitigation and Prevention

In this section, we discuss immediate steps to take and long-term security practices to mitigate the CVE.

Immediate Steps to Take

Disable or restrict access to the Config Import menu on affected MOXA devices.
Regularly monitor and audit network traffic for any suspicious activity.

Long-Term Security Practices

Implement input validation to sanitize user inputs and prevent script injection.
Keep devices up to date with the latest firmware and security patches.
Educate users about safe browsing practices to minimize the risk of XSS attacks.
Consider deploying web application firewalls to filter and block malicious traffic.
Conduct security assessments and penetration testing regularly to identify and address vulnerabilities.

Patching and Updates

Regularly check for firmware updates and security advisories from MOXA to apply patches addressing the XSS vulnerability.