CVE-2019-5078 : Security Advisory and Response

A denial of service vulnerability in the iocheckd service "I/O-Check" functionality of WAGO PFC200 and PFC100 firmware versions can be exploited for network communication disruption.

Understanding CVE-2019-5078

This CVE involves a vulnerability in WAGO PFC200 and PFC100 firmware versions that can lead to a denial of service attack.

What is CVE-2019-5078?

The vulnerability in the iocheckd service of WAGO PFC200 and PFC100 firmware versions allows attackers to disrupt network communications without authentication.

The Impact of CVE-2019-5078

Exploiting this vulnerability can result in the affected device entering an error state, halting all network communications.

Technical Details of CVE-2019-5078

This section provides detailed technical information about the CVE.

Vulnerability Description

The vulnerability lies in the iocheckd service of WAGO PFC200 Firmware versions 03.01.07(13) and 03.00.39(12), as well as WAGO PFC100 Firmware version 03.00.39(12).

Affected Systems and Versions

WAGO PFC200 Firmware version 03.01.07(13)
WAGO PFC200 Firmware version 03.00.39(12)
WAGO PFC100 Firmware version 03.00.39(12)

Exploitation Mechanism

By sending a carefully crafted set of packets, an attacker can trigger the vulnerability, causing a denial of service attack.

Mitigation and Prevention

Protecting systems from CVE-2019-5078 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply vendor-provided patches promptly.
Implement network segmentation to limit the impact of potential attacks.
Monitor network traffic for any suspicious activity.

Long-Term Security Practices

Regularly update firmware and software to mitigate known vulnerabilities.
Conduct security assessments and penetration testing to identify and address weaknesses.

Patching and Updates

Regularly check for firmware updates and security patches from WAGO to address the CVE-2019-5078 vulnerability.