CVE-2019-5173 : Security Advisory and Response

A security vulnerability exists in the 'I/O-Check' function of WAGO PFC200 Firmware version 03.02.02(14), allowing command injection through specially crafted XML cache files.

Understanding CVE-2019-5173

This CVE involves a command injection vulnerability in the iocheckd service of the WAGO PFC200.

What is CVE-2019-5173?

The vulnerability enables an attacker to inject OS commands by manipulating XML cache files on the device.

The Impact of CVE-2019-5173

The vulnerability allows unauthorized individuals to execute arbitrary commands on the affected device, potentially leading to system compromise.

Technical Details of CVE-2019-5173

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The issue arises from the iocheckd service in the 'I/O-Check' function of WAGO PFC200 Firmware version 03.02.02(14), where specially crafted XML cache files can be used to inject malicious commands.

Affected Systems and Versions

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

Exploitation Mechanism

Attacker creates a specially designed XML cache file
File is placed in a specific location on the device
Triggering the parsing of this cache file leads to command injection
The state value extracted from the XML file is used to execute malicious commands

Mitigation and Prevention

Protecting systems from CVE-2019-5173 involves immediate actions and long-term security practices.

Immediate Steps to Take

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

Long-Term Security Practices

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

Patching and Updates

WAGO or the vendor, Wago, may release patches to address the vulnerability
Regularly check for updates and apply them as soon as they are available