CVE-2019-6571 in LOGO!8
Summary
by MITRE
A vulnerability has been identified in SIEMENS LOGO!8 (6ED1052-xyyxx-0BA8 FS:01 to FS:06 / Firmware version V1.80.xx and V1.81.xx), SIEMENS LOGO!8 (6ED1052-xyy08-0BA0 FS:01 / Firmware version < V1.82.02). An attacker with network access to port 10005/tcp of the LOGO! device could cause a Denial-of-Service condition by sending specially crafted packets. The security vulnerability could be exploited by an unauthenticated attacker with network access to the affected service. No user interaction is required to exploit this security vulnerability. Successful exploitation of the security vulnerability compromises availability of the targeted system. At the time of advisory publication no public exploitation of this security vulnerability was known.
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Analysis
by VulDB Data Team • 10/05/2023
The vulnerability identified as CVE-2019-6571 affects Siemens LOGO device and various configuration tools, making it a logical target for network-based attacks.
The technical flaw resides in the improper handling of incoming network packets on the exposed service. When an attacker sends specifically crafted packets to port 10005, the device's processing logic fails to adequately validate or sanitize the input data, leading to a condition where the device becomes unresponsive or crashes entirely. This behavior constitutes a classic denial-of-service vulnerability where legitimate network traffic is disrupted through malformed packet injection. The vulnerability is particularly concerning because it requires no authentication, user interaction, or specialized knowledge to exploit, making it accessible to any network attacker with access to the device's network interface. The flaw essentially allows an attacker to trigger an uncontrolled shutdown or crash of the device's operating system or application layer, rendering the industrial control system unavailable for its intended operational purposes.
The operational impact of this vulnerability extends beyond simple service disruption, as industrial control systems often operate in environments where continuous operation is critical for safety and production processes. When a LOGO!8 device becomes unavailable due to this vulnerability, it can lead to cascading failures in the broader industrial control network, potentially affecting production lines, safety systems, or other dependent devices. The vulnerability's characteristics align with CWE-129, which addresses improper validation of input boundaries, and more specifically with CWE-400, which covers resource exhaustion conditions. From an attack framework perspective, this vulnerability maps to ATT&CK technique T1499.004, which involves network denial of service attacks, and T1566.001, which encompasses spearphishing through social engineering. The lack of authentication requirements and the automated nature of exploitation make this particularly dangerous in industrial environments where physical security may be less stringent than in traditional IT environments.
Mitigation strategies for this vulnerability should prioritize immediate firmware updates from Siemens, as the company has likely released patches addressing the specific input validation issues. Network segmentation and access control measures should be implemented to restrict access to port 10005 to only authorized personnel and systems, effectively reducing the attack surface. Network monitoring solutions should be deployed to detect anomalous packet patterns that might indicate exploitation attempts, while implementing rate limiting or packet filtering rules at the network perimeter can help prevent exploitation. Organizations should also consider implementing redundant control systems or failover mechanisms to maintain operational continuity in case of successful exploitation. The vulnerability demonstrates the critical importance of maintaining current firmware versions in industrial environments and highlights the need for comprehensive security assessments of industrial control systems, particularly those running legacy protocols that may not include robust input validation mechanisms.