CVE-2020-8974 in TPS200 NG
Summary
by MITRE • 10/18/2022
In ZGR TPS200 NG 2.00 firmware version and 1.01 hardware version, the firmware upload process does not perform any type of restriction. This allows an attacker to modify it and re-upload it via web with malicious modifications, rendering the device unusable.
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Analysis
by VulDB Data Team • 10/18/2022
The vulnerability identified as CVE-2020-8974 affects the ZGR TPS200 NG device operating with firmware version 2.00 and hardware version 1.01, presenting a critical security flaw in the device's firmware update mechanism. This weakness stems from the complete absence of validation procedures during the firmware upload process, creating an exploitable condition that allows unauthorized modifications to the device's core software components. The device's web-based interface provides an attack surface where malicious actors can upload altered firmware images without any verification checks, fundamentally compromising the integrity of the device's operational environment.
This vulnerability represents a severe deviation from established security practices and aligns with CWE-494, which describes the dangerous use of download functions without integrity checks. The lack of firmware validation mechanisms creates a pathway for attackers to execute arbitrary code modifications, potentially transforming the device from a legitimate industrial control system into a compromised node within a broader attack infrastructure. The absence of cryptographic signature verification, checksum validation, or version control mechanisms during the firmware upload process eliminates any form of authentication or authorization for software modifications, making the device particularly susceptible to supply chain attacks and persistent threats.
The operational impact of this vulnerability extends beyond simple device compromise, as the malicious firmware modifications can render the device completely non-functional or cause it to behave in unexpected ways that may compromise the entire network infrastructure it operates within. This vulnerability directly impacts the device's availability and reliability, potentially leading to operational disruptions in industrial environments where the TPS200 NG devices are deployed for critical monitoring and control functions. The consequences of successful exploitation can include complete device bricking, unauthorized access to network resources, or the potential for attackers to establish persistent backdoors within the operational technology environment, affecting both cybersecurity and industrial control system security standards.
Organizations should implement immediate mitigations including network segmentation to isolate affected devices, disabling unnecessary web interfaces, and implementing strict access controls for firmware update procedures. The recommended approach involves establishing a secure firmware update protocol that includes digital signature verification, integrity checking mechanisms, and proper authentication procedures before allowing any firmware modifications to be applied. Security measures should also include regular firmware integrity monitoring, network traffic analysis for suspicious upload activities, and implementing device authentication protocols that prevent unauthorized firmware modifications. This vulnerability demonstrates the critical importance of firmware security in industrial control systems and aligns with ATT&CK technique T1547.001 for registry run keys and T1078 for valid accounts, as attackers could potentially establish persistent access through compromised firmware installations. Organizations must also consider implementing secure element technologies or trusted platform modules to provide hardware-level protection against unauthorized firmware modifications and ensure compliance with industrial security standards such as NIST SP 800-82 and IEC 62443.