CVE-2013-2791 in SCADA DNP3 OPC Server
Summary
by MITRE
MatrikonOPC SCADA DNP3 OPC Server 1.2.0 allows remote attackers to cause a denial of service (master-station daemon crash) via a malformed DNP3 TCP packet from the IP address of an outstation.
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Analysis
by VulDB Data Team • 02/28/2018
The vulnerability identified as CVE-2013-2791 affects MatrikonOPC SCADA DNP3 OPC Server version 1.2.0, representing a critical security flaw that exposes industrial control systems to remote exploitation. This vulnerability specifically targets the DNP3 protocol implementation within the OPC server software, which serves as a bridge between industrial automation systems and enterprise networks. The DNP3 protocol is widely used in electric utilities, water treatment facilities, and other critical infrastructure environments for communication between master stations and outstations. The affected MatrikonOPC server operates as a gateway that translates DNP3 protocol data into OPC format for consumption by enterprise applications, making it a crucial component in SCADA system architectures.
The technical flaw manifests through improper input validation mechanisms within the DNP3 TCP packet processing functionality. When the server receives a malformed DNP3 TCP packet from an outstation IP address, the parsing logic fails to properly handle the unexpected data structure, leading to a critical system failure. This vulnerability falls under the CWE-129 weakness category, specifically addressing improper validation of input boundaries, and represents a classic buffer over-read condition that can cause memory corruption and subsequent system instability. The malformed packet structure exploits a lack of proper boundary checking in the DNP3 protocol parser, causing the master-station daemon to crash and terminate unexpectedly. This type of vulnerability is particularly dangerous in industrial environments where continuous operation is critical for safety and operational continuity.
The operational impact of this vulnerability extends beyond simple service disruption, as it can lead to complete system outages in critical infrastructure environments. When the master-station daemon crashes, the entire communication chain between the SCADA system and field devices is severed, potentially leading to loss of monitoring capabilities and control functions. This denial of service condition can have cascading effects throughout the industrial control network, as other systems may not receive critical operational data or commands. The vulnerability is particularly concerning because it allows remote exploitation from any IP address that can reach the affected OPC server, meaning that attackers do not need physical access to the industrial network to cause disruption. This characteristic aligns with ATT&CK technique T1499.001, which describes network denial of service attacks targeting operational technology environments.
Organizations utilizing MatrikonOPC SCADA DNP3 OPC Server should implement immediate mitigation strategies to address this vulnerability. The most effective approach involves applying the vendor-provided security patch or upgrading to a newer version of the software that contains proper input validation mechanisms. Network segmentation and access controls should be implemented to limit exposure of the affected OPC server to untrusted networks, while monitoring systems should be deployed to detect anomalous DNP3 traffic patterns. Additionally, administrators should configure the OPC server to implement strict input validation and connection filtering to prevent malformed packets from reaching the vulnerable parsing logic. The vulnerability demonstrates the importance of proper protocol implementation in industrial control systems and highlights the need for regular security assessments of operational technology components that interface with enterprise networks.