CVE-2021-32926 Explained : Impact and Mitigation

This article provides insights into CVE-2021-32926, a vulnerability affecting Micro800 and MicroLogix 1400 devices that could potentially lead to a denial-of-service condition.

Understanding CVE-2021-32926

CVE-2021-32926 involves a security flaw that arises when an authenticated password change request occurs. This vulnerability allows an attacker to intercept the message containing the new password hash and replace it with a malicious hash, consequently preventing the user from authenticating to the controller.

What is CVE-2021-32926?

When an authenticated password change request is made, an attacker can manipulate the password hash, leading to a situation where the user is unable to authenticate, resulting in a denial-of-service scenario.

The Impact of CVE-2021-32926

The exploitation of this vulnerability could result in a denial-of-service condition, as the legitimate password hash is replaced with a malicious one, preventing access to the affected controller.

Technical Details of CVE-2021-32926

This section delves into the specifics of the vulnerability, outlining affected systems, versions, and the exploitation mechanism.

Vulnerability Description

CVE-2021-32926 allows an attacker to replace the legitimate password hash with an illegitimate one during an authenticated password change request, leading to a denial-of-service state.

Affected Systems and Versions

Micro800 devices of all versions and MicroLogix 1400 devices from Version 21 and later with Enhanced Password Security enabled are susceptible to this vulnerability.

Exploitation Mechanism

The vulnerability is exploited by intercepting the message containing the new password hash during an authenticated password change request and substituting it with a malicious hash, rendering the user unable to authenticate.

Mitigation and Prevention

In this section, we discuss steps to mitigate the risks posed by CVE-2021-32926 and prevent potential exploitation.

Immediate Steps to Take

Users are advised to disable Enhanced Password Security on affected MicroLogix 1400 devices and stay vigilant for any unauthorized password change requests.

Long-Term Security Practices

Implementing strong password policies, conducting regular security audits, and educating users on password security best practices can enhance long-term security.

Patching and Updates

Vendors may release patches or updates to address CVE-2021-32926. Ensure timely application of security patches to protect against potential threats.