CVE-2021-22808 : Security Advisory and Response

A CWE-416: Use After Free vulnerability exists in Eurotherm by Schneider Electric GUIcon Version 2.0 (Build 683.003) and prior. This vulnerability could lead to arbitrary code execution when a malicious *.gd1 configuration file is loaded into the GUIcon tool.

Understanding CVE-2021-22808

This section provides insights into the impact, technical details, and mitigation strategies for CVE-2021-22808.

What is CVE-2021-22808?

CVE-2021-22808 is a Use After Free vulnerability in Eurotherm by Schneider Electric GUIcon Version 2.0 and earlier versions. An attacker can exploit this vulnerability by loading a malicious *.gd1 configuration file into the GUIcon tool, potentially leading to arbitrary code execution.

The Impact of CVE-2021-22808

The exploitation of this vulnerability could result in an attacker executing arbitrary code on the targeted system, compromising its integrity and confidentiality. It poses a serious threat to the security of systems running the affected Eurotherm GUIcon versions.

Technical Details of CVE-2021-22808

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

Vulnerability Description

CVE-2021-22808 is classified as a CWE-416: Use After Free vulnerability. The flaw arises when a malicious *.gd1 configuration file is processed by the GUIcon tool, allowing an attacker to execute arbitrary code.

Affected Systems and Versions

Eurotherm by Schneider Electric GUIcon Version 2.0 (Build 683.003) and prior are confirmed to be impacted by this vulnerability. Users of these versions are at risk of exploitation and should take immediate action to secure their systems.

Exploitation Mechanism

An attacker can exploit CVE-2021-22808 by crafting a specially designed *.gd1 configuration file and enticing a user to load it into the vulnerable GUIcon tool. Once executed, the malicious code can take advantage of the Use After Free flaw to achieve arbitrary code execution.

Mitigation and Prevention

This section outlines the steps that users and administrators can take to mitigate the risks posed by CVE-2021-22808.

Immediate Steps to Take

It is recommended to cease using Eurotherm GUIcon Version 2.0 and prior until a security patch is released. Users should exercise caution when handling external or untrusted configuration files to prevent exploitation.

Long-Term Security Practices

Implementing security best practices, such as regular software updates, network segmentation, and user awareness training, can enhance the overall security posture and mitigate similar vulnerabilities in the future.

Patching and Updates

Stay informed about security advisories from Schneider Electric regarding CVE-2021-22808. Apply patches and updates as soon as they are available to protect your systems from known vulnerabilities.