CVE-2019-5081 Explained : Impact and Mitigation

The WAGO PFC 200 and PFC100 devices are affected by a heap buffer overflow vulnerability that can lead to remote code execution.

Understanding CVE-2019-5081

This CVE involves a critical vulnerability in the iocheckd service of WAGO PFC 200 and PFC100 devices, allowing attackers to execute arbitrary code.

What is CVE-2019-5081?

The vulnerability in the iocheckd service of WAGO PFC 200 Firmware versions 03.01.07(13) and 03.00.39(12), as well as PFC100 Firmware version 03.00.39(12), enables a heap buffer overflow when receiving specially crafted packets, potentially leading to code execution.

The Impact of CVE-2019-5081

The exploitation of this vulnerability can result in remote code execution without the need for authentication, posing a significant security risk to affected systems.

Technical Details of CVE-2019-5081

Vulnerability Description

The heap buffer overflow vulnerability in the iocheckd service of WAGO PFC 200 and PFC100 devices allows attackers to trigger code execution by sending malicious packets.

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

Attackers can exploit this vulnerability by sending a specifically crafted set of packets to the iocheckd service, bypassing authentication requirements.

Mitigation and Prevention

Immediate Steps to Take

Apply security patches provided by WAGO to address the vulnerability.
Implement network segmentation to limit exposure of vulnerable devices.
Monitor network traffic for any suspicious activities.

Long-Term Security Practices

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

Patching and Updates

Ensure timely installation of security patches released by WAGO to protect the devices from potential exploits.