CVE-2019-5185 : What You Need to Know

A vulnerability in the iocheckd service known as "I/O-Check" in WAGO PFC 200 exposes a stack buffer overflow that can be exploited when a specially crafted packet is sent. This vulnerability can lead to a service crash if triggered with a specific state value.

Understanding CVE-2019-5185

This CVE involves a stack buffer overflow vulnerability in the iocheckd service of WAGO PFC 200, allowing attackers to crash the service by sending a specially crafted packet.

What is CVE-2019-5185?

The vulnerability in the iocheckd service of WAGO PFC 200 allows for a stack buffer overflow when processing specially crafted packets, potentially leading to a service crash.

The Impact of CVE-2019-5185

The exploitation of this vulnerability can result in a denial of service (DoS) condition by crashing the affected service.

Technical Details of CVE-2019-5185

This section provides more technical insights into the vulnerability.

Vulnerability Description

The vulnerability arises from a stack buffer overflow in the iocheckd service of WAGO PFC 200, triggered by parsing a cache file with a specially crafted packet.

Affected Systems and Versions

Product: Wago
Vendor: n/a
Affected Version: WAGO PFC200 Firmware version 03.02.02(14)

Exploitation Mechanism

An attacker sends a specially crafted packet to trigger cache file parsing in the iocheckd service.
The vulnerability occurs when the state value extracted from an xml file is used as an argument for the sprintf() function, leading to a buffer overflow.
If the state value exceeds a certain length, it causes a crash due to an invalid memory access.

Mitigation and Prevention

Protecting systems from this vulnerability requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply vendor-supplied patches or updates to fix the vulnerability.
Implement network segmentation to limit the impact of potential attacks.

Long-Term Security Practices

Regularly update and patch all software and firmware to prevent known vulnerabilities.
Conduct security assessments and penetration testing to identify and address weaknesses.

Patching and Updates

Regularly check for security advisories from the vendor and apply patches promptly to mitigate risks.