CVE-2019-5176 Explained : Impact and Mitigation

The WAGO PFC 200 Firmware version 03.02.02(14) has a stack buffer overflow vulnerability in the iocheckd service's 'I/O-Check' functionality, allowing attackers to crash the service by sending a crafted packet.

Understanding CVE-2019-5176

This CVE involves a specific vulnerability in the WAGO PFC 200 Firmware version 03.02.02(14) that can be exploited through a stack buffer overflow.

What is CVE-2019-5176?

This CVE refers to a stack buffer overflow vulnerability in the iocheckd service's 'I/O-Check' functionality of WAGO PFC 200 Firmware version 03.02.02(14).

The Impact of CVE-2019-5176

The vulnerability allows an attacker to crash the service by sending a specially crafted packet, affecting the availability of the system.

Technical Details of CVE-2019-5176

This section provides more technical insights into the vulnerability.

Vulnerability Description

The issue arises when a gateway value exceeds a specific length, causing a buffer overflow during the sprintf() function call.

Affected Systems and Versions

Product: WAGO PFC200
Vendor: Wago
Firmware version: 03.02.02(14)

Exploitation Mechanism

Attacker sends a crafted packet to trigger parsing of a cache file
Buffer overflow occurs when gateway value exceeds a certain length
Crash caused by overflowing the destination buffer

Mitigation and Prevention

Protecting systems from CVE-2019-5176 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply vendor-supplied patches or updates
Implement network segmentation to limit exposure
Monitor network traffic for suspicious activities

Long-Term Security Practices

Regularly update firmware and software
Conduct security assessments and penetration testing
Educate users on safe computing practices

Patching and Updates

Check vendor's website for security advisories
Apply patches promptly to mitigate the vulnerability