CVE-2019-5074 : Exploit Details and Defense Strategies

A vulnerability has been discovered in the "I/O-Check" feature of the WAGO PFC200 Firmware version 03.01.07(13), WAGO PFC200 Firmware version 03.00.39(12), and WAGO PFC100 Firmware version 03.00.39(12). This vulnerability can be exploited through a stack buffer overflow by sending a carefully crafted set of packets, which can lead to the execution of malicious code. The attacker does not need to be authenticated to trigger this vulnerability.

Understanding CVE-2019-5074

This CVE identifies a remote code execution vulnerability in WAGO PFC200 and PFC100 devices.

What is CVE-2019-5074?

CVE-2019-5074 is a stack buffer overflow vulnerability in the iocheckd service 'I/O-Check' functionality of WAGO PFC200 and PFC100 devices.

The Impact of CVE-2019-5074

The vulnerability allows an attacker to execute malicious code by exploiting a stack buffer overflow, potentially compromising the affected systems.

Technical Details of CVE-2019-5074

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The vulnerability exists in the 'I/O-Check' functionality of WAGO PFC200 Firmware versions 03.01.07(13) and 03.00.39(12), as well as PFC100 Firmware version 03.00.39(12). It can be triggered by sending specially crafted packets, leading to a stack buffer overflow.

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 unauthenticated packets to trigger the stack buffer overflow, enabling the execution of malicious code.

Mitigation and Prevention

Protecting systems from CVE-2019-5074 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply patches provided by the vendor to mitigate the vulnerability.
Implement network segmentation to limit the attack surface.
Monitor network traffic for any suspicious activity.

Long-Term Security Practices

Regularly update firmware and software to address security vulnerabilities.
Conduct security assessments and penetration testing to identify and remediate weaknesses.
Educate users and administrators about cybersecurity best practices.

Patching and Updates

Stay informed about security advisories and updates from WAGO.
Apply patches promptly to ensure systems are protected against known vulnerabilities.