CVE-2020-8976 in TPS200 NG
Summary
by MITRE • 10/18/2022
The integrated server of the ZGR TPS200 NG on its 2.00 firmware version and 1.01 hardware version, allows a remote attacker to perform actions with the permissions of a victim user. For this to happen, the victim user has to have an active session and triggers the malicious request.
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Analysis
by VulDB Data Team • 11/10/2022
The vulnerability identified as CVE-2020-8976 affects the ZGR TPS200 NG integrated server running firmware version 2.00 with hardware version 1.01. This represents a critical security flaw that enables remote code execution with elevated privileges, specifically allowing attackers to perform actions under the context of authenticated victim users. The vulnerability stems from inadequate input validation and authentication mechanisms within the server's web interface implementation. The affected device operates as a networked industrial control system component that typically manages industrial processes and monitoring functions.
The technical exploitation of this vulnerability occurs through a remote attack vector that leverages the existing session of a legitimate user. This type of flaw falls under the Common Weakness Enumeration category of weak session management and insufficient authorization checks. The attack requires the victim user to be actively logged into the system and to inadvertently trigger a malicious request, making it particularly dangerous in operational technology environments where users may be less security-aware. The vulnerability essentially allows for privilege escalation from regular user permissions to potentially administrative capabilities depending on the system configuration.
From an operational impact perspective, this vulnerability poses significant risks to industrial control systems and critical infrastructure environments where the ZGR TPS200 NG devices are deployed. The attack requires minimal user interaction beyond maintaining an active session, making it particularly stealthy and difficult to detect. The implications extend beyond simple data compromise to potential system disruption, process manipulation, and unauthorized control of industrial processes. Organizations implementing these devices in manufacturing, energy, or other critical sectors face substantial risk of operational disruption and safety hazards.
The attack pattern aligns with techniques documented in the MITRE ATT&CK framework under the privilege escalation and defense evasion domains. Specifically, this vulnerability enables techniques such as "Exploitation for Privilege Escalation" and "Taint Data" where an attacker can manipulate system behavior through legitimate user sessions. The vulnerability also represents a failure in the principle of least privilege enforcement, as the system does not properly validate that requests originate from authenticated and authorized sources. Organizations should consider implementing network segmentation, regular firmware updates, and continuous monitoring of authentication sessions to detect potential exploitation attempts.
Mitigation strategies should include immediate firmware updates from the vendor to address the identified vulnerability, implementation of network access controls to restrict unauthorized access to the device, and deployment of intrusion detection systems to monitor for suspicious session activity. Security teams should also conduct comprehensive vulnerability assessments of all industrial control system components and establish incident response procedures specifically tailored for operational technology environments. The vulnerability highlights the importance of maintaining current firmware versions and implementing robust access controls in industrial settings where security is paramount.