CVE-2023-2071: Rockwell FactoryTalk View RCE Vulnerability

CVE-2023-2071 Overview

CVE-2023-2071 is a critical remote code execution vulnerability affecting Rockwell Automation FactoryTalk View Machine Edition running on PanelView Plus devices. The vulnerability stems from improper verification of user input, which allows unauthenticated attackers to execute arbitrary code remotely via specially crafted malicious packets.

The affected devices include functionality through a CIP (Common Industrial Protocol) class that executes exported functions from libraries. While a security routine exists to restrict execution to specific functions from two designated dynamic link library files, attackers can bypass this protection by uploading a custom malicious library to the device, enabling them to execute arbitrary code.

Critical Impact

Unauthenticated remote code execution on industrial control systems can lead to complete device compromise, operational disruption, safety hazards, and potential access to broader industrial networks.

Affected Products

• Rockwell Automation FactoryTalk View Machine Edition
• Rockwell Automation PanelView Plus HMI devices
• Industrial control system environments utilizing affected FactoryTalk View deployments

Discovery Timeline

• September 12, 2023 - CVE-2023-2071 published to NVD
• November 21, 2024 - Last updated in NVD database

Technical Details for CVE-2023-2071

Vulnerability Analysis

This vulnerability combines improper input validation (CWE-20) with unrestricted file upload capabilities (CWE-434) to enable remote code execution. The attack is particularly dangerous because it requires no authentication, can be executed over the network, and targets industrial control equipment commonly found in manufacturing and critical infrastructure environments.

The FactoryTalk View Machine Edition platform includes a CIP class implementation that provides the ability to execute functions exported from dynamic link libraries. Under normal operation, a security routine restricts this functionality to only allow execution of specific functions from two pre-approved DLL files. However, the vulnerability allows attackers to circumvent this restriction entirely.

Root Cause

The root cause lies in insufficient validation of CIP class requests and the ability to upload arbitrary library files to the device. The existing security check that restricts function execution to approved DLLs can be bypassed because:

1. The input validation mechanism does not properly verify the source and integrity of library files
2. Attackers can upload custom-crafted libraries to the device through the CIP interface
3. Once a malicious library is uploaded, the security routine fails to prevent execution of functions within it

This represents a classic combination of improper input validation combined with dangerous file upload functionality, creating a direct path to code execution.

Attack Vector

The attack is conducted over the network using the Common Industrial Protocol (CIP), which is widely used in industrial automation environments. An attacker with network access to the target PanelView Plus device can:

1. Craft malicious CIP packets targeting the vulnerable class
2. Upload a custom DLL containing malicious code to the device
3. Trigger execution of functions within the uploaded library
4. Achieve arbitrary code execution with the privileges of the FactoryTalk View application

The attack requires no authentication, no user interaction, and can be executed with low complexity, making it highly accessible to attackers who gain network access to industrial environments.

Detection Methods for CVE-2023-2071

Indicators of Compromise

• Unexpected DLL files appearing on PanelView Plus devices outside of normal update cycles
• Unusual CIP traffic patterns or connections from unauthorized sources to affected devices
• Process anomalies or unexpected behavior on PanelView Plus HMI systems
• Network connections from HMI devices to unknown external addresses

Detection Strategies

• Monitor CIP protocol traffic for anomalous class requests targeting library execution functionality
• Implement network segmentation monitoring to detect unauthorized access attempts to industrial control networks
• Deploy industrial-aware intrusion detection systems (IDS) capable of inspecting CIP traffic
• Establish baseline behavior for PanelView Plus devices and alert on deviations

Monitoring Recommendations

• Enable comprehensive logging on network devices separating IT and OT environments
• Monitor for file system changes on affected devices, particularly new DLL files
• Implement network traffic analysis for EtherNet/IP and CIP protocol anomalies
• Configure alerts for any unauthorized network access attempts to industrial control segments

How to Mitigate CVE-2023-2071

Immediate Actions Required

• Apply vendor-provided security patches immediately to all affected FactoryTalk View Machine Edition installations
• Restrict network access to PanelView Plus devices using firewalls and network segmentation
• Ensure affected devices are not directly accessible from untrusted networks or the internet
• Implement network monitoring for CIP protocol traffic to affected systems

Patch Information

Rockwell Automation has released security guidance and patches addressing this vulnerability. Organizations should consult the Rockwell Automation Security Advisory for specific patch information and update procedures for their affected products. Apply updates according to vendor recommendations and established change management procedures for industrial control systems.

Workarounds

• Implement strict network segmentation to isolate affected PanelView Plus devices from untrusted networks
• Use firewalls to restrict CIP protocol access to only authorized systems and personnel
• Disable remote access to affected devices when not operationally required
• Implement application whitelisting where supported to prevent unauthorized library execution

# Network segmentation example - restrict CIP access to HMI devices
# Example firewall rules (adapt to your specific firewall platform)

# Block all inbound CIP traffic (TCP/UDP 44818) from untrusted networks
iptables -A INPUT -p tcp --dport 44818 -s ! 10.100.0.0/24 -j DROP
iptables -A INPUT -p udp --dport 44818 -s ! 10.100.0.0/24 -j DROP

# Allow CIP traffic only from authorized engineering workstations
iptables -A INPUT -p tcp --dport 44818 -s 10.100.0.50 -j ACCEPT
iptables -A INPUT -p udp --dport 44818 -s 10.100.0.50 -j ACCEPT