CVE-2013-0666 in MatrikonOPC Security Gateway
Summary
by MITRE
The configuration utility in MatrikonOPC Security Gateway 1.0 allows remote attackers to cause a denial of service (unhandled exception and application crash) via a TCP RST packet.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 04/30/2017
The vulnerability identified as CVE-2013-0666 affects the MatrikonOPC Security Gateway version 1.0 configuration utility, representing a significant security flaw that enables remote attackers to execute denial of service attacks. This issue specifically targets the network communication handling mechanisms within the security gateway's configuration interface, which operates over TCP connections. The vulnerability stems from inadequate exception handling within the application's network protocol stack, particularly when processing TCP RST (reset) packets that are typically used to terminate TCP connections. When the configuration utility receives a malformed or unexpected TCP RST packet, it fails to properly handle the exception, leading to an unhandled exception that causes the application to crash and terminate unexpectedly.
The technical implementation of this vulnerability involves the configuration utility's failure to implement proper input validation and exception handling for network traffic. TCP RST packets are standard components of the TCP protocol suite designed to abruptly terminate connections, but when improperly handled by applications, they can become attack vectors. The flaw demonstrates poor defensive programming practices and lacks robust error handling mechanisms that should be implemented to prevent application crashes from malformed network input. This vulnerability aligns with CWE-400, which addresses "Uncontrolled Resource Consumption," as the application's failure to properly manage TCP connection states results in resource exhaustion through application termination. Additionally, the vulnerability relates to CWE-248, "Uncaught Exception," indicating that the application does not properly anticipate and handle exceptional conditions that occur during normal operation.
The operational impact of this vulnerability extends beyond simple service disruption, as it can be exploited by remote attackers without requiring authentication or privileged access. Attackers can simply send a specially crafted TCP RST packet to the configuration utility's listening port, causing the application to crash and potentially rendering the security gateway inoperative. This creates a persistent denial of service condition that can be repeated indefinitely, effectively disabling the gateway's configuration capabilities and potentially compromising the overall security posture of the industrial control system. The vulnerability is particularly concerning in operational technology environments where system availability is critical, as it can lead to extended downtime and potential safety risks in industrial processes. The attack surface is broad since TCP RST packets can be sent from any network location, making the vulnerability accessible to attackers regardless of their physical proximity to the target system.
Mitigation strategies for CVE-2013-0666 should focus on both immediate defensive measures and long-term architectural improvements. Network administrators should implement firewall rules to restrict access to the configuration utility's TCP ports, limiting exposure to trusted networks only. Additionally, deploying intrusion detection systems that can identify and block malformed TCP RST packets may provide additional protection. The most effective long-term solution involves updating to a patched version of the MatrikonOPC Security Gateway that includes proper exception handling for TCP connection management. Organizations should also implement network segmentation to isolate industrial control systems from general network access, reducing the attack surface. This vulnerability demonstrates the importance of implementing the principle of least privilege and defense in depth, as recommended by the MITRE ATT&CK framework for operational technology environments. The incident highlights the need for regular security assessments and vulnerability management processes specifically tailored for industrial control systems, where traditional cybersecurity measures may not be sufficient to address unique operational technology risks.