CVE-2022-29863 in OPC UA .NET Standard
Summary
by MITRE • 06/16/2022
OPC UA .NET Standard Stack 1.04.368 allows remote attacker to cause a crash via a crafted message that triggers excessive memory allocation.
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Analysis
by VulDB Data Team • 06/17/2022
The vulnerability identified as CVE-2022-29863 affects the OPC UA .NET Standard Stack version 1.04.368, representing a critical security flaw that enables remote attackers to execute a denial of service attack through carefully crafted malicious messages. This issue stems from inadequate input validation mechanisms within the OPC UA communication stack, which processes messages without proper bounds checking or resource allocation limits. The vulnerability manifests when the system receives a specially crafted message that triggers excessive memory allocation patterns, ultimately leading to system instability and potential application crashes. The OPC UA protocol, widely used in industrial automation and control systems, serves as a critical communication framework for connecting industrial devices and enterprise systems, making this vulnerability particularly concerning for operational technology environments.
The technical implementation of this flaw involves the stack's failure to properly validate message parameters during the parsing and processing phases of OPC UA communications. When an attacker sends a maliciously constructed message containing oversized or malformed data structures, the system attempts to allocate memory proportional to the crafted parameters without adequate safeguards. This behavior directly maps to CWE-770, which addresses allocation of resources without proper limits or checks, and aligns with ATT&CK technique T1499.004 related to network denial of service attacks. The memory allocation patterns triggered by the crafted messages cause the system to consume excessive resources, leading to memory exhaustion and subsequent application crashes that can disrupt critical industrial processes.
The operational impact of CVE-2022-29863 extends beyond simple service disruption, as it can severely compromise the availability and reliability of industrial control systems that depend on OPC UA communications. In manufacturing environments, process control systems, supervisory control and data acquisition systems, and other critical infrastructure components may experience unexpected downtime when this vulnerability is exploited. The attack can be executed remotely without requiring authentication, making it particularly dangerous for systems with exposed OPC UA endpoints. Organizations using affected versions of the OPC UA .NET Standard Stack face significant operational risks including production line stoppages, data integrity issues, and potential safety hazards in environments where automation systems control physical processes. The vulnerability's impact is amplified in connected environments where multiple systems communicate through OPC UA protocols, potentially allowing attackers to cascade their attacks across entire industrial networks.
Mitigation strategies for CVE-2022-29863 should focus on immediate patching of the affected OPC UA .NET Standard Stack to version 1.04.368 or later, which contains the necessary fixes for proper input validation and resource allocation limits. Organizations should implement network segmentation and access controls to limit exposure of OPC UA endpoints to untrusted networks, following ATT&CK technique T1046 for network service scanning and T1068 for exploit for privilege escalation. Additional protective measures include implementing intrusion detection systems that monitor for unusual memory allocation patterns and anomalous OPC UA traffic, deploying application firewalls with deep packet inspection capabilities, and establishing monitoring procedures for detecting memory exhaustion events. System administrators should also consider implementing rate limiting and message size restrictions at network boundaries to prevent malicious messages from reaching vulnerable systems. The vulnerability highlights the importance of proper resource management in industrial communication protocols and underscores the need for robust security practices in operational technology environments where system availability is paramount.