CVE-2022-32140 in CODESYS
Summary
by MITRE • 06/24/2022
Multiple CODESYS products are affected to a buffer overflow.A low privileged remote attacker may craft a request, which can cause a buffer copy without checking the size of the service, resulting in a denial-of-service condition. User Interaction is not required.
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Analysis
by VulDB Data Team • 07/14/2022
The vulnerability identified as CVE-2022-32140 represents a critical buffer overflow flaw affecting multiple CODESYS products within the industrial automation and control systems domain. This vulnerability resides in the handling of service requests within the CODESYS runtime environment, where insufficient input validation leads to unsafe memory operations. The flaw manifests when the system processes incoming requests without proper size verification, creating an opportunity for malicious actors to exploit the buffer overflow condition. The severity of this vulnerability is compounded by its remote accessibility and the absence of user interaction requirements, making it particularly dangerous in industrial environments where continuous operation is critical. CODESYS products are widely deployed in manufacturing, process control, and industrial IoT applications, where they serve as foundational components for programmable logic controllers and embedded systems.
The technical implementation of this buffer overflow vulnerability stems from inadequate bounds checking within the service request processing pipeline. When a remote attacker crafts a malicious request containing oversized data payloads, the system fails to validate the incoming data size against the allocated buffer space. This allows the overflow to occur during memory copy operations, potentially overwriting adjacent memory locations and corrupting the program state. The vulnerability specifically affects the CODESYS runtime environment's handling of service requests, where the buffer copy operation lacks proper size validation mechanisms. The flaw is classified as a classic buffer overflow condition that can lead to unpredictable program behavior, including application crashes, memory corruption, and potential system instability. According to CWE standards, this vulnerability maps to CWE-121, which describes stack-based buffer overflow conditions, though the specific implementation may involve heap-based overflow patterns common in industrial software stacks.
The operational impact of CVE-2022-32140 extends beyond simple denial-of-service conditions to potentially compromise entire industrial control systems. In manufacturing environments where CODESYS products control critical processes, a successful exploitation could lead to production halts, safety system failures, or even physical damage to equipment. The remote nature of the attack means that adversaries can target these systems from external networks without requiring physical access or user credentials, making the attack surface significantly broader than typical local vulnerabilities. Industrial systems often operate continuously with minimal downtime tolerance, so even brief service interruptions caused by this vulnerability can result in substantial financial losses and operational disruptions. The vulnerability's classification under the ATT&CK framework would align with T1499.004, which covers network denial of service attacks, and potentially T1059.001 for command and scripting interpreter usage in exploitation activities. Organizations using CODESYS products in critical infrastructure environments face heightened risk profiles, as these systems often lack the robust security monitoring and incident response capabilities typical of enterprise environments.
Mitigation strategies for CVE-2022-32140 should prioritize immediate patch deployment from CODESYS vendors, as this represents the most effective solution to address the root cause. Network segmentation and access controls should be implemented to limit exposure of affected systems to untrusted networks, while firewall rules can be configured to restrict access to specific ports and services. Monitoring systems should be enhanced to detect anomalous request patterns that may indicate exploitation attempts, particularly focusing on oversized payload deliveries. Organizations should conduct comprehensive vulnerability assessments to identify all instances of affected CODESYS products within their operational technology environments, as these systems may be deployed across multiple locations and network segments. The implementation of input validation controls and bounds checking mechanisms should be prioritized in system hardening efforts, particularly for industrial control systems that may not have received regular security updates. Regular security assessments and penetration testing should be conducted to verify the effectiveness of implemented mitigations, while incident response procedures should be updated to include specific handling protocols for buffer overflow exploitation attempts in industrial control environments. Additionally, organizations should consider implementing network-based intrusion detection systems specifically configured to identify and alert on suspicious service request patterns that could indicate exploitation of this vulnerability.