CVE-2019-18320 in SPPA-T3000 Application Server
Summary
by MITRE
A vulnerability has been identified in SPPA-T3000 Application Server (All versions). An attacker with network access to the Application Server could be able to upload arbitrary files without authentication. Please note that an attacker needs to have network access to the Application Server in order to exploit this vulnerability. At the time of advisory publication no public exploitation of this security vulnerability was known.
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Analysis
by VulDB Data Team • 03/11/2024
The vulnerability identified as CVE-2019-18320 affects the SPPA-T3000 Application Server, a critical component in industrial automation and control systems used primarily in power generation and process control environments. This vulnerability represents a severe authentication bypass issue that allows unauthenticated attackers to upload arbitrary files to the server. The SPPA-T3000 system is designed for supervisory control and data acquisition in power plant operations, making it a high-value target for cyberattacks that could potentially disrupt critical infrastructure operations. The vulnerability exists within the application server component that handles file upload functionalities, creating an attack vector that bypasses normal authentication mechanisms.
The technical flaw stems from insufficient input validation and authentication checks within the file upload handler of the SPPA-T3000 Application Server. This weakness allows attackers to bypass the normal authentication process required for file upload operations, enabling them to place malicious files on the server without proper credentials. The vulnerability is classified as a path traversal or file upload vulnerability, which aligns with CWE-434: "Unrestricted Upload of File with Dangerous Type." The attack requires only network access to the application server itself, meaning that an attacker does not need to be physically present at the site or have access to the local network, though they must be able to reach the server through network connections. This characteristic makes the vulnerability particularly dangerous as it can be exploited remotely from any location with network connectivity to the targeted server.
The operational impact of this vulnerability is significant for organizations using SPPA-T3000 systems, as it creates a potential pathway for attackers to gain persistent access to critical industrial control systems. Successful exploitation could allow attackers to deploy malware, backdoors, or other malicious payloads that could remain undetected for extended periods. The ability to upload arbitrary files without authentication directly violates fundamental security principles and could enable attackers to escalate privileges, modify system configurations, or even take control of the entire application server. This vulnerability particularly threatens the integrity and availability of power generation and process control systems, where system reliability and security are paramount. According to ATT&CK framework, this vulnerability maps to T1195.001: "Phishing for Information" and potentially T1059.001: "Command and Scripting Interpreter" if attackers use the uploaded files to execute commands on the server.
Organizations should implement immediate mitigations to address this vulnerability, including network segmentation to isolate the SPPA-T3000 Application Server from general network access, implementing strict firewall rules to restrict access to only authorized personnel, and applying vendor-provided patches as soon as they become available. The vulnerability should be prioritized for remediation as it allows for arbitrary file upload without authentication, which is a critical security flaw in industrial control systems. Additional protective measures include implementing network monitoring to detect unusual file upload activities, conducting regular security assessments of industrial control systems, and establishing robust access control policies. The vulnerability also highlights the importance of secure coding practices and input validation in industrial software, as proper authentication mechanisms should always be enforced before allowing file upload operations. Organizations should also consider implementing intrusion detection systems specifically designed for industrial environments to monitor for potential exploitation attempts. The lack of known public exploitation at the time of advisory publication does not diminish the severity of the vulnerability, as it represents a critical weakness that could be easily leveraged by sophisticated attackers with knowledge of industrial control systems.