CVE-2021-21867 : Vulnerability Insights and Analysis

An unsafe deserialization vulnerability exists in the CODESYS Development System 3.5.16 and 3.5.17, allowing arbitrary command execution when processing a specially crafted file.

Understanding CVE-2021-21867

This vulnerability affects versions 3.5.16 and 3.5.17 of the CODESYS Development System, posing a high risk with a CVSS base score of 8.8.

What is CVE-2021-21867?

The vulnerability lies in the ObjectManager.plugin ObjectStream.ProfileByteArray functionality, enabling attackers to execute arbitrary commands using a malicious file.

The Impact of CVE-2021-21867

With a high base severity rating, the vulnerability could lead to confidentiality, integrity, and availability compromise without requiring privileges.

Technical Details of CVE-2021-21867

The vulnerability allows unauthenticated attackers to trigger arbitrary command execution through a specially crafted file.

Vulnerability Description

The unsafe deserialization vulnerability arises in the ObjectManager.plugin ObjectStream.ProfileByteArray functionality of CODESYS Development System versions 3.5.16 and 3.5.17.

Affected Systems and Versions

The affected versions include CODESYS Development System 3.5.16 and 3.5.17.

Exploitation Mechanism

An attacker can exploit this vulnerability by providing a specially crafted file to the affected system, triggering arbitrary command execution.

Mitigation and Prevention

It is crucial to implement immediate security measures and apply patches to prevent exploitation and enhance the overall security posture.

Immediate Steps to Take

Users are advised to update to the latest patched versions or apply security fixes provided by the vendor.

Long-Term Security Practices

Practicing secure coding, input validation, and file handling techniques can help prevent similar vulnerabilities in the future.

Patching and Updates

Regularly check for security updates and apply patches promptly to mitigate the risk of exploitation.