CVE-2021-21869 : Exploit Details and Defense Strategies

An unsafe deserialization vulnerability in CODESYS GmbH CODESYS Development System versions 3.5.16 and 3.5.17 could allow arbitrary command execution when processing specially crafted files.

Understanding CVE-2021-21869

This CVE involves an unsafe deserialization vulnerability in CODESYS Development System versions 3.5.16 and 3.5.17, posing a significant risk of arbitrary command execution.

What is CVE-2021-21869?

The vulnerability exists in the ProfileInformation ProfileData functionality of CODESYS. An attacker could exploit this flaw by providing a malicious file, triggering arbitrary command execution.

The Impact of CVE-2021-21869

With a CVSS base score of 8.8 (High), the vulnerability has a severe impact on confidentiality, integrity, and availability. Attackers could exploit this to execute arbitrary commands.

Technical Details of CVE-2021-21869

This section outlines the specific technical details of the CVE.

Vulnerability Description

An unsafe deserialization vulnerability in the Engine.plugin ProfileInformation ProfileData functionality of CODESYS GmbH CODESYS Development System 3.5.16 and 3.5.17 allows arbitrary command execution through specially crafted files.

Affected Systems and Versions

The vulnerability affects CODESYS GmbH CODESYS Development System versions 3.5.16 and 3.5.17.

Exploitation Mechanism

Attackers can exploit this vulnerability by providing a malicious file to the affected CODESYS systems, enabling arbitrary command execution.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-21869, organizations and users should take immediate actions and implement long-term security measures.

Immediate Steps to Take

Ensure that security patches provided by CODESYS are promptly applied to the affected systems. Consider restricting access to affected systems and monitoring for any suspicious activities.

Long-Term Security Practices

Implement secure coding practices, conduct regular security training for developers, and stay informed about potential vulnerabilities in CODESYS products.

Patching and Updates

Regularly check for updates and security advisories from CODESYS. Stay proactive in applying patches and security upgrades to protect against known vulnerabilities.