CVE-2021-27422 : Vulnerability Insights and Analysis

This article provides details about CVE-2021-27422, a vulnerability in GE UR family firmware versions prior to version 8.1x that exposes sensitive information without authentication.

Understanding CVE-2021-27422

This section delves into the impact, technical details, and mitigation strategies related to CVE-2021-27422.

What is CVE-2021-27422?

CVE-2021-27422 affects GE UR family devices running firmware versions prior to 8.1x. The vulnerability allows unauthorized access to sensitive information through the web server interface over HTTP without requiring authentication.

The Impact of CVE-2021-27422

With a CVSS base score of 7.5, this vulnerability poses a high risk to confidentiality, exposing sensitive data to unauthorized actors. The attack complexity is low, and it can be exploited over a network without user interaction.

Technical Details of CVE-2021-27422

This section outlines the vulnerability description, affected systems, versions, and how the exploitation takes place.

Vulnerability Description

The vulnerability in GE UR family firmware versions prior to 8.1x enables an unauthorized actor to access sensitive information via the web server interface without authentication.

Affected Systems and Versions

The vulnerability impacts GE UR family devices with firmware versions less than 8.1x, exposing them to information exposure risks.

Exploitation Mechanism

The vulnerability can be exploited by accessing the UR web server interface over HTTP, allowing malicious actors to obtain sensitive information without the need for authentication.

Mitigation and Prevention

To address CVE-2021-27422, immediate steps and long-term security practices are essential.

Immediate Steps to Take

GE strongly recommends users to update UR devices to firmware version 8.10 or higher to mitigate the vulnerability. Additionally, users should follow network defense-in-depth practices to secure UR IEDs and refer to the UR Deployment guide for secure configurations.

Long-Term Security Practices

Implement network security measures such as access controls, monitoring systems like Intrusion Detection Systems, and other mitigating technologies to secure UR IEDs in control system network perimeters.

Patching and Updates

GE provides additional mitigations and vulnerability information in GE Publication Number: GES-2021-004 (login required) to help users secure their devices against CVE-2021-27422.