CVE-2019-5169 : Exploit Details and Defense Strategies

A vulnerability in the iocheckd service's "I/O-Check" function of the WAGO PFC 200 Firmware version 03.02.02(14) allows for command injection, potentially leading to unauthorized execution of operating system commands.

Understanding CVE-2019-5169

This CVE involves a command injection vulnerability in a specific firmware version of the WAGO PFC 200, which can be exploited through a crafted XML cache file.

What is CVE-2019-5169?

The vulnerability in the iocheckd service of the WAGO PFC 200 Firmware version 03.02.02(14) enables attackers to inject operating system commands by manipulating a custom XML cache file.

The Impact of CVE-2019-5169

Exploiting this vulnerability could result in unauthorized execution of commands on the affected device, potentially leading to further compromise or disruption.

Technical Details of CVE-2019-5169

This section provides more in-depth technical insights into the vulnerability.

Vulnerability Description

The vulnerability allows for command injection through the parsing of a specially crafted XML cache file, leading to the execution of unauthorized operating system commands.

Affected Systems and Versions

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

Exploitation Mechanism

Attackers create a custom XML cache file and place it in a specific location on the device
By sending a specially crafted packet, the cache file is parsed, and the gateway value extracted from the XML file is used to execute unauthorized commands
The command is executed via a call to system()

Mitigation and Prevention

To address and prevent the exploitation of CVE-2019-5169, the following steps are recommended:

Immediate Steps to Take

Apply vendor-supplied patches or updates to mitigate the vulnerability
Monitor network traffic for any suspicious activities
Restrict access to vulnerable systems

Long-Term Security Practices

Regularly update firmware and software to the latest versions
Implement network segmentation to limit the impact of potential attacks
Conduct security assessments and penetration testing to identify and address vulnerabilities

Patching and Updates

Stay informed about security advisories and updates from the vendor
Apply patches promptly to ensure the security of the system