CVE-2017-20084 in Smart Visu Server
Summary
by MITRE • 06/22/2022
A vulnerability has been found in JUNG Smart Visu Server 1.0.804/1.0.830/1.0.832 and classified as critical. Affected by this vulnerability is an unknown functionality of the component KNX Group Address. The manipulation leads to backdoor. Local access is required to approach this attack. The exploit has been disclosed to the public and may be used. Upgrading to version 1.0.900 is able to address this issue. It is recommended to upgrade the affected component.
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Analysis
by VulDB Data Team • 11/14/2022
The vulnerability identified as CVE-2017-20084 represents a critical security flaw in JUNG Smart Visu Server versions 1.0.804, 1.0.830, and 1.0.832, specifically affecting the KNX Group Address functionality within the system. This vulnerability falls under the category of backdoor access mechanisms that can be exploited to gain unauthorized control over the affected system. The flaw is particularly concerning because it enables attackers to establish persistent access points within industrial control systems that manage building automation and smart building environments. The KNX Group Address component serves as a critical communication element in building automation protocols, making this vulnerability especially dangerous in environments where physical security and automated building systems are interconnected.
The technical implementation of this vulnerability involves a backdoor mechanism that allows local attackers with physical access to the system to bypass normal authentication and authorization controls. This backdoor functionality enables unauthorized users to gain elevated privileges and potentially access sensitive building management data or manipulate automated systems controlling lighting, heating, ventilation, air conditioning, and other critical building functions. The vulnerability requires local access to exploit, which means that an attacker must already have physical presence or network access to the target system, but once exploited, the backdoor provides persistent access that can be maintained across system reboots or normal operational cycles. The attack vector demonstrates characteristics consistent with CWE-284 (Improper Access Control) and potentially CWE-916 (Use of Password Hash with Insufficient Computational Complexity) if password-based access controls are involved.
The operational impact of this vulnerability extends beyond simple unauthorized access to encompass potential compromise of entire building automation systems and the broader industrial control networks they support. In smart building environments, this vulnerability could enable attackers to manipulate environmental controls, disable security systems, or gain access to sensitive data about building operations and occupancy patterns. The disclosure of the exploit to the public increases the risk profile significantly, as it provides threat actors with documented techniques to compromise these systems. Building automation systems are increasingly integrated with broader enterprise networks, making this vulnerability potentially exploitable for lateral movement within larger organizational infrastructures, which aligns with ATT&CK technique T1071.004 (Application Layer Protocol: DNS) and T1566 (Phishing for Information) when considering the broader attack surface.
The recommended remediation approach involves upgrading the affected JUNG Smart Visu Server components to version 1.0.900, which contains patches addressing the backdoor vulnerability. This upgrade process should be carefully planned and executed within the context of industrial control system maintenance protocols, ensuring that critical building automation functions remain operational during the update process. Organizations should implement comprehensive vulnerability management procedures that include regular assessment of industrial control system components, network segmentation to limit potential attack surfaces, and monitoring for suspicious access patterns that might indicate exploitation attempts. Additionally, implementing network access controls, disabling unnecessary services, and maintaining detailed audit logs of system access can help detect and prevent exploitation of similar vulnerabilities. The vulnerability serves as a reminder of the critical importance of securing industrial control systems and the need for continuous security assessment of embedded systems within building automation environments, particularly those that interface with enterprise networks and may contain sensitive operational data.