CVE-2019-19789 : Exploit Details and Defense Strategies

A NULL pointer dereference vulnerability exists in CODESYS SP Realtime NT versions before V2.3.7.28, CODESYS Runtime Toolkit 32 bit full versions before V2.4.7.54, and CODESYS PLCWinNT versions before V2.4.7.54.

Understanding CVE-2019-19789

This CVE identifies a specific vulnerability in CODESYS products that could lead to a NULL pointer dereference.

What is CVE-2019-19789?

CVE-2019-19789 is a security vulnerability found in 3S-Smart CODESYS SP Realtime NT, CODESYS Runtime Toolkit 32 bit full, and CODESYS PLCWinNT versions before specific releases.

The Impact of CVE-2019-19789

The vulnerability could allow an attacker to exploit a NULL pointer dereference, potentially leading to a denial of service or arbitrary code execution.

Technical Details of CVE-2019-19789

This section provides more in-depth technical information about the vulnerability.

Vulnerability Description

A NULL pointer dereference vulnerability exists in CODESYS SP Realtime NT, CODESYS Runtime Toolkit 32 bit full, and CODESYS PLCWinNT versions before specific releases.

Affected Systems and Versions

CODESYS SP Realtime NT versions before V2.3.7.28
CODESYS Runtime Toolkit 32 bit full versions before V2.4.7.54
CODESYS PLCWinNT versions before V2.4.7.54

Exploitation Mechanism

The vulnerability can be exploited by an attacker to trigger a NULL pointer dereference, potentially leading to a system crash or unauthorized code execution.

Mitigation and Prevention

To address CVE-2019-19789, follow these mitigation strategies:

Immediate Steps to Take

Update affected CODESYS products to versions V2.3.7.28, V2.4.7.54, or later.
Monitor vendor communications for patches or workarounds.

Long-Term Security Practices

Regularly update software and firmware to the latest versions.
Implement network segmentation and access controls to limit exposure.

Patching and Updates

Apply patches provided by CODESYS promptly to address the vulnerability.