CVE-2019-5079 : Exploit Details and Defense Strategies

A vulnerability in WAGO PFC200 and PFC100 firmware versions allows for remote code execution through a heap buffer overflow in the iocheckd service.

Understanding CVE-2019-5079

This CVE involves a critical security issue in WAGO PFC200 and PFC100 devices that could lead to unauthorized code execution.

What is CVE-2019-5079?

This vulnerability enables attackers to exploit a heap buffer overflow in the "I/O-Check" functionality of the iocheckd service in specific firmware versions of WAGO PFC200 and PFC100 devices.

The Impact of CVE-2019-5079

The vulnerability permits remote code execution without the need for authentication, posing a severe security risk to affected systems.

Technical Details of CVE-2019-5079

This section delves into the technical aspects of the CVE.

Vulnerability Description

The vulnerability allows attackers to trigger a heap buffer overflow by sending crafted packets, potentially leading to code execution.

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 the vulnerability by sending specially crafted packets to the iocheckd service, triggering the heap buffer overflow.

Mitigation and Prevention

Protecting systems from CVE-2019-5079 is crucial to prevent unauthorized access and code execution.

Immediate Steps to Take

Apply patches or updates provided by WAGO to address the vulnerability.
Implement network segmentation to limit access to vulnerable devices.
Monitor network traffic for any suspicious activity.

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

Stay informed about security advisories from WAGO and apply patches promptly to secure the devices.