CVE-2019-5174 : Exploit Details and Defense Strategies

A vulnerability in the iocheckd service's 'I/O-Check' function in the WAGO PFC 200 version 03.02.02(14) allows for command injection, enabling attackers to execute OS commands by manipulating XML cache files.

Understanding CVE-2019-5174

This CVE involves a command injection vulnerability in the WAGO PFC 200 firmware version 03.02.02(14).

What is CVE-2019-5174?

The vulnerability in the iocheckd service's 'I/O-Check' function of the WAGO PFC 200 version 03.02.02(14) permits attackers to inject OS commands by exploiting specially crafted XML cache files.

The Impact of CVE-2019-5174

The vulnerability allows threat actors to execute arbitrary commands on affected devices, potentially leading to unauthorized access and control.

Technical Details of CVE-2019-5174

This section provides detailed technical insights into the vulnerability.

Vulnerability Description

The vulnerability arises from the parsing of a customized XML cache file, enabling the injection of OS commands through a crafted packet.

Affected Systems and Versions

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

Exploitation Mechanism

Attackers can exploit the vulnerability by placing a customized XML cache file in a specific location on the device.
By sending a specially crafted packet, the parsing of the cache file is triggered, allowing for command injection.
The subnetmask value extracted from the XML file is used as an argument in the command execution process.

Mitigation and Prevention

Protecting systems from CVE-2019-5174 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply vendor-supplied patches or updates promptly.
Implement network segmentation to limit the impact of potential attacks.
Monitor network traffic for any suspicious activity.

Long-Term Security Practices

Regularly update and patch all software and firmware on devices.
Conduct security assessments and penetration testing to identify vulnerabilities.
Educate users and administrators about secure configuration practices.

Patching and Updates

Regularly check for security advisories from the vendor.
Apply patches or updates as soon as they are available to mitigate the vulnerability.