CVE-2021-34598 : Security Advisory and Response

A detailed overview of CVE-2021-34598 focusing on the Phoenix Contact FL MGUARD vulnerability related to the lack of memory release in remote logging functionality.

Understanding CVE-2021-34598

This section provides insights into the impact, technical details, and mitigation strategies related to CVE-2021-34598.

What is CVE-2021-34598?

Phoenix Contact FL MGUARD versions 1.4.0, 1.4.1, and 1.5.0 suffer from impaired remote logging functionality due to the lack of memory release for data structures when active.

The Impact of CVE-2021-34598

The vulnerability presents a high availability impact with a CVSS base score of 7.5, potentially exploited over a network without the need for user interaction.

Technical Details of CVE-2021-34598

This section delves into the vulnerability description, affected systems, and exploitation mechanisms.

Vulnerability Description

The flaw arises from the improper release of memory in Phoenix Contact FL MGUARD devices, leading to remote logging dysfunctionality.

Affected Systems and Versions

FL MGUARD versions 1.4.0 and 1.4.1, which include FL MGUARD 1102 and 1105, are impacted by this memory release issue.

Exploitation Mechanism

Attackers can potentially exploit this vulnerability remotely over the network, affecting the availability of the systems.

Mitigation and Prevention

This section outlines immediate steps to take and long-term security practices to prevent exploits.

Immediate Steps to Take

Users are advised to upgrade affected devices to firmware version 1.5.1 or later to mitigate the memory release issue.

Long-Term Security Practices

To prevent potential attacks, it is recommended to disable remote logging on affected Phoenix Contact FL MGUARD devices.

Patching and Updates

Regularly apply security patches and firmware updates to maintain system integrity and protect against known vulnerabilities.