CVE-2019-18858 : Security Advisory and Response

A Buffer Overflow exists in versions of CODESYS 3 web server prior to 3.5.15.20, which is included in the CODESYS Control runtime systems.

Understanding CVE-2019-18858

A Buffer Overflow vulnerability in CODESYS 3 web server versions before 3.5.15.20, distributed with CODESYS Control runtime systems.

What is CVE-2019-18858?

CODESYS 3 web server, part of CODESYS Control runtime systems, is susceptible to a Buffer Overflow.

The Impact of CVE-2019-18858

Attackers can exploit this vulnerability to execute arbitrary code or crash the system.
Unauthorized access to sensitive information may occur.

Technical Details of CVE-2019-18858

A detailed look at the technical aspects of the vulnerability.

Vulnerability Description

The vulnerability lies in the CODESYS 3 web server, allowing attackers to trigger a Buffer Overflow.

Affected Systems and Versions

Versions of CODESYS 3 web server before 3.5.15.20 are affected.
CODESYS Control runtime systems incorporating the vulnerable web server are at risk.

Exploitation Mechanism

Attackers can craft malicious input to overrun the buffer, leading to potential system compromise.

Mitigation and Prevention

Measures to address and prevent exploitation of CVE-2019-18858.

Immediate Steps to Take

Update CODESYS 3 web server to version 3.5.15.20 or later.
Implement network security measures to restrict unauthorized access.

Long-Term Security Practices

Regularly monitor and update software components for security patches.
Conduct security assessments to identify and mitigate vulnerabilities proactively.

Patching and Updates

Apply patches and updates provided by CODESYS to fix the Buffer Overflow vulnerability.