CVE-2023-25078: Honeywell Experion Server DoS Vulnerability

CVE-2023-25078 Overview

CVE-2023-25078 is a heap overflow vulnerability affecting Honeywell Experion industrial control system (ICS) components. The vulnerability occurs during the handling of a specially crafted message for a specific configuration operation, which can cause a Denial of Service (DoS) condition on affected Server or Console Station systems.

This vulnerability is particularly concerning for critical infrastructure environments where Honeywell Experion systems are deployed for process control and automation. An attacker exploiting this flaw could disrupt operations by rendering key control system components unavailable.

Critical Impact

A remote, unauthenticated attacker can cause a Denial of Service condition on Honeywell Experion Server or Console Station components through heap overflow, potentially disrupting critical industrial control operations.

Affected Products

• Honeywell Experion Server
• Honeywell Experion Station
• Honeywell Engineering Station
• Honeywell Direct Station

Discovery Timeline

• 2023-07-13 - CVE-2023-25078 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2023-25078

Vulnerability Analysis

This vulnerability is classified under CWE-787 (Out-of-bounds Write), commonly referred to as a heap overflow. The flaw exists in the message handling mechanism used for configuration operations within the Honeywell Experion platform.

When the affected components process specially crafted network messages, improper bounds checking allows data to be written beyond the allocated heap buffer. This memory corruption leads to an unstable application state, ultimately causing the service to crash and creating a Denial of Service condition.

The vulnerability is network-accessible, meaning an attacker does not require local access to the target system. Additionally, no authentication or user interaction is required to trigger the flaw, making it particularly dangerous in environments where Experion systems are exposed to untrusted network segments.

Root Cause

The root cause of CVE-2023-25078 is insufficient input validation and boundary checking in the message parsing routines responsible for handling configuration operation requests. When processing incoming network messages, the affected code fails to properly verify the size of incoming data before copying it into heap-allocated buffers, resulting in an out-of-bounds write condition.

Attack Vector

The attack vector for this vulnerability is network-based. An attacker can remotely send a specially crafted message to the vulnerable Experion component targeting the configuration operation handler. The attack does not require any prior authentication or user interaction, making it a viable target for opportunistic attackers scanning industrial networks.

The attacker must have network connectivity to the affected Honeywell Experion system. In properly segmented OT environments, this may require the attacker to first compromise a system on the industrial network. However, improperly configured networks with direct internet exposure or flat network architectures significantly increase the risk of exploitation.

The exploitation mechanism involves sending malformed messages that exceed expected buffer sizes during configuration operations. When processed, the oversized data overwrites adjacent heap memory, corrupting application state and causing the service to terminate unexpectedly.

Detection Methods for CVE-2023-25078

Indicators of Compromise

• Unexpected crashes or service restarts of Honeywell Experion Server or Station components
• Anomalous network traffic patterns targeting Experion configuration service ports
• System logs showing memory-related errors or heap corruption warnings prior to service failures
• Repeated connection attempts from unusual IP addresses to Experion management interfaces

Detection Strategies

• Deploy network intrusion detection systems (NIDS) with rules to identify malformed configuration messages targeting Honeywell Experion systems
• Enable and monitor application crash dumps for heap overflow signatures and memory corruption indicators
• Implement deep packet inspection at network boundaries to detect oversized or malformed messages destined for Experion components
• Configure SIEM correlation rules to alert on patterns of service restarts combined with network anomalies

Monitoring Recommendations

• Continuously monitor the availability and health status of all Honeywell Experion Server and Station components
• Implement network traffic baselining to detect deviations in communication patterns to Experion systems
• Enable verbose logging on Experion components and forward logs to a centralized SIEM for analysis
• Regularly audit network segmentation to ensure Experion systems are isolated from untrusted network segments

How to Mitigate CVE-2023-25078

Immediate Actions Required

• Review the Honeywell Process Security Overview for specific security notifications and recommended version upgrades
• Verify that all Honeywell Experion components are isolated on a segmented OT network with strict firewall controls
• Restrict network access to Experion configuration interfaces to authorized IP addresses only
• Implement network monitoring to detect and block potential exploitation attempts

Patch Information

Honeywell has released security guidance for addressing this vulnerability. Organizations should consult the official Honeywell Security Notification referenced in the CVE description for specific recommendations on upgrading and versioning affected components. Contact Honeywell support or visit the Honeywell Process Security Overview portal for access to the latest security patches and upgrade documentation.

Workarounds

• Implement strict network segmentation to isolate Honeywell Experion systems from general corporate networks and the internet
• Deploy application-layer firewalls or ICS-aware security appliances to filter malformed messages before they reach Experion components
• Disable or restrict access to configuration operation interfaces when not actively in use for maintenance
• Enable host-based monitoring and endpoint protection on systems running Experion software to detect crash events

# Example network segmentation firewall rule (syntax varies by firewall vendor)
# Restrict access to Experion configuration ports from authorized management stations only
iptables -A INPUT -p tcp --dport <experion_config_port> -s <authorized_management_subnet> -j ACCEPT
iptables -A INPUT -p tcp --dport <experion_config_port> -j DROP