CVE-2025-0960: C-more EA9 HMI RCE Vulnerability

CVE-2025-0960 Overview

CVE-2025-0960 is a critical buffer overflow vulnerability affecting AutomationDirect C-more EA9 Human-Machine Interface (HMI) devices. The vulnerability exists in a function where bounds checks can be bypassed, allowing attackers to exploit the flaw remotely. Successful exploitation could result in denial-of-service conditions or remote code execution on affected industrial control system devices.

Critical Impact

This vulnerability enables network-based attackers to potentially achieve remote code execution or cause denial-of-service on industrial HMI devices without requiring authentication or user interaction. Given the ICS/SCADA nature of affected devices, exploitation could disrupt critical industrial processes.

Affected Products

• AutomationDirect C-more EA9 HMI devices

Discovery Timeline

• February 4, 2025 - CVE-2025-0960 published to NVD
• February 4, 2025 - Last updated in NVD database

Technical Details for CVE-2025-0960

Vulnerability Analysis

This vulnerability is classified as CWE-120 (Buffer Copy without Checking Size of Input), commonly known as a classic buffer overflow. The flaw exists in a function within the AutomationDirect C-more EA9 HMI firmware where input bounds validation can be circumvented. When an attacker sends specially crafted network traffic to the vulnerable device, they can skip the bounds checking logic and overflow the buffer.

The network-accessible nature of this vulnerability is particularly concerning for industrial environments. HMI devices like the C-more EA9 are typically used to monitor and control industrial processes, making them high-value targets. An attacker who gains remote code execution on such a device could potentially manipulate industrial control systems, view sensitive operational data, or use the compromised device as a pivot point for further attacks within the operational technology (OT) network.

Root Cause

The root cause of CVE-2025-0960 is a buffer overflow condition (CWE-120) where a function copies input data to a buffer without properly validating the size of the input. The bounds checking mechanism in the vulnerable function can be bypassed, allowing data larger than the allocated buffer to be written to memory. This overflow can corrupt adjacent memory locations, potentially overwriting critical program data, return addresses, or function pointers.

Attack Vector

The attack vector is network-based and requires no authentication or user interaction. An attacker can exploit this vulnerability by:

1. Identifying a vulnerable AutomationDirect C-more EA9 HMI device accessible on the network
2. Crafting malicious input designed to bypass the bounds checking mechanism
3. Sending the malicious payload to the device over the network
4. The buffer overflow occurs, potentially leading to code execution or device crash

The vulnerability is exploitable remotely from any network position that can communicate with the affected HMI device. In poorly segmented industrial networks, this could include access from corporate networks or even the internet if the device is inadvertently exposed.

Detection Methods for CVE-2025-0960

Indicators of Compromise

• Unexpected network connections to C-more EA9 HMI devices from untrusted sources
• Device crashes, restarts, or unresponsive behavior indicating denial-of-service attacks
• Anomalous network traffic patterns targeting HMI communication ports
• Unusual memory consumption or CPU utilization on affected devices

Detection Strategies

• Implement network intrusion detection systems (IDS) with signatures for buffer overflow exploitation attempts
• Monitor for unusual packet sizes or malformed requests targeting HMI devices
• Deploy network traffic analysis tools to baseline and detect anomalous communications with industrial devices
• Configure SIEM alerts for connection attempts to HMI devices from non-whitelisted IP addresses

Monitoring Recommendations

• Enable logging on network devices that can capture traffic to and from HMI systems
• Implement asset inventory tracking to identify all C-more EA9 devices in the environment
• Configure alerts for device availability to quickly detect denial-of-service conditions
• Establish baseline behavior patterns for HMI network communications to identify deviations

How to Mitigate CVE-2025-0960

Immediate Actions Required

• Review the CISA ICS Advisory ICSA-25-035-08 for official guidance
• Implement network segmentation to isolate HMI devices from untrusted networks
• Apply firewall rules to restrict access to C-more EA9 devices to only authorized IP addresses
• Check the AutomationDirect Security Advisories for available patches or firmware updates

Patch Information

Organizations should consult the official AutomationDirect security advisories for patch availability and update instructions. CISA has published advisory ICSA-25-035-08 with additional mitigation guidance for this vulnerability. Given the critical nature of this vulnerability, applying vendor-provided patches should be prioritized as soon as they become available.

Workarounds

• Implement strict network access controls to limit connectivity to HMI devices
• Place C-more EA9 HMI devices behind firewalls and ensure they are not directly accessible from the internet
• Use VPN connections for any required remote access to industrial control networks
• Disable any unnecessary network services on the HMI devices to reduce attack surface
• Implement application-layer firewalls or deep packet inspection to filter malicious traffic

# Example network segmentation using iptables (adjust for your environment)
# Restrict access to HMI device (example IP: 192.168.100.50) from trusted management subnet only
iptables -A INPUT -s 192.168.10.0/24 -d 192.168.100.50 -j ACCEPT
iptables -A INPUT -d 192.168.100.50 -j DROP