CVE-2022-31803 : Security Advisory and Response

CODESYS Gateway Server V2 is prone to a Denial of Service (DoS) attack due to an insufficient check for the activity of TCP client connections. This vulnerability allows an unauthenticated attacker to consume all available TCP connections, potentially disrupting legitimate user connections to the server.

Understanding CVE-2022-31803

This section will provide insights into the nature and impact of the vulnerability affecting CODESYS Gateway Server V2.

What is CVE-2022-31803?

CVE-2022-31803 involves an insufficient check for TCP client connections in CODESYS Gateway Server V2, enabling an attacker to exhaust available TCP connections and hinder new connection establishment.

The Impact of CVE-2022-31803

The vulnerability poses a medium risk with a CVSS base score of 5.3. It can lead to a denial of service condition, preventing legitimate users or clients from establishing connections to the server.

Technical Details of CVE-2022-31803

This section will delve into the specific technical details of the vulnerability.

Vulnerability Description

An insufficient check for the activity of TCP client connections allows unauthenticated attackers to exhaust TCP connections, affecting connection establishment.

Affected Systems and Versions

CODESYS Gateway Server V2 versions up to V2.3.9.38 are impacted by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by initiating a high volume of TCP client connections, overwhelming the server and leading to a denial of service.

Mitigation and Prevention

Protecting systems from CVE-2022-31803 requires immediate actions and long-term security practices.

Immediate Steps to Take

Users are advised to update CODESYS Gateway Server V2 to a non-vulnerable version, apply security patches, and implement network-level protections.

Long-Term Security Practices

Implement network segmentation, access controls, and monitoring mechanisms to detect and mitigate potential DoS attacks.

Patching and Updates

Regularly check for security advisories from CODESYS and apply patches promptly to address known vulnerabilities.