CVE-2021-34594 : Exploit Details and Defense Strategies

A relative path traversal vulnerability was discovered in the TwinCAT OPC UA Server, affecting versions TF6100 and TS6100 before 4.3.48.0, as well as TcOpcUaServer versions below 3.2.0.19423. This vulnerability could allow administrators to create or delete files on the system.

Understanding CVE-2021-34594

This section will provide insights into the nature and impact of the vulnerability.

What is CVE-2021-34594?

The CVE-2021-34594 relates to a relative path traversal vulnerability present in the TwinCAT OPC UA Server. It could be exploited by attackers to manipulate files on the system.

The Impact of CVE-2021-34594

The vulnerability poses a medium-level risk with high availability and integrity impact. Attackers with high privileges could potentially compromise the system by creating or deleting critical files.

Technical Details of CVE-2021-34594

Explore the specific technical aspects of the CVE.

Vulnerability Description

The vulnerability allows unauthorized administrators to traverse relative paths, potentially leading to arbitrary file operations on the affected system.

Affected Systems and Versions

TwinCAT OPC UA Server versions TF6100 and TS6100 before 4.3.48.0, as well as TcOpcUaServer versions below 3.2.0.19423, are affected.

Exploitation Mechanism

Attackers can exploit this vulnerability by manipulating paths within the OPC UA Server, granting them unauthorized access to file system operations.

Mitigation and Prevention

Learn how to mitigate the risks associated with CVE-2021-34594.

Immediate Steps to Take

Users are advised to update to a version of the affected products that is equal to or greater than TF6100 or TS6100 version 4.3.48.0.

Long-Term Security Practices

Implement strict file system access controls and regularly update the OPC UA Server to prevent such vulnerabilities.

Patching and Updates

Stay proactive by applying security patches and updates released by Beckhoff Automation to address CVE-2021-34594.