CVE-2017-6565 in TS-550 EVO
Summary
by MITRE
On Franklin Fueling Systems TS-550 evo 2.3.0.7332 devices, the roleDiag user, which can be obtained by exploiting CVE-2013-7247, has the ability to upload files to the server hosting the web service. As no sanitization checks are in place, an attacker can upload a malicious payload.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 09/22/2020
The vulnerability described in CVE-2017-6565 represents a critical security flaw within the Franklin Fueling Systems TS-550 evo fueling system, specifically affecting firmware version 2.3.0.7332. This device operates as a web-based service platform that manages fueling operations and system diagnostics, making it a prime target for cyber attacks in industrial control environments. The vulnerability stems from inadequate input validation mechanisms that permit arbitrary file uploads without proper sanitization checks, creating a pathway for malicious actors to compromise the system's integrity and potentially disrupt critical infrastructure operations.
The technical exploitation of this vulnerability begins with the prior compromise of the roleDiag user account, which is made possible through the exploitation of CVE-2013-7247. This prerequisite attack vector demonstrates the cascading nature of security weaknesses in industrial systems where initial footholds can lead to more severe compromises. Once the roleDiag user credentials are obtained, the attacker gains the ability to interact with the web service's file upload functionality, which lacks proper validation mechanisms to inspect or sanitize uploaded content. This absence of input sanitization creates a direct pathway for attackers to upload malicious payloads including web shells, malware, or other harmful executables that can be executed within the server environment.
The operational impact of this vulnerability extends beyond simple unauthorized file uploads, as it fundamentally undermines the security posture of the fueling infrastructure. Industrial control systems such as the TS-550 evo are designed to operate in secure environments where unauthorized access can lead to operational disruptions, data compromise, or even physical safety risks. The ability to upload malicious payloads creates potential for persistent threats that can maintain access to the system, exfiltrate sensitive operational data, or disrupt fueling operations. This vulnerability aligns with CWE-434, which specifically addresses the issue of uncontrolled file uploads, and represents a significant concern for critical infrastructure protection standards.
From a threat modeling perspective, this vulnerability maps directly to several ATT&CK tactics including initial access through credential compromise and persistence via malicious file execution. The attack surface is particularly concerning given that fueling systems often operate in environments where physical security is paramount, and digital security controls must provide equivalent protection. Organizations implementing such systems should consider the broader implications of this vulnerability within their overall security architecture, particularly in environments where industrial control systems are connected to corporate networks or the internet. The lack of proper input validation and sanitization mechanisms demonstrates a failure to implement defense-in-depth principles that are essential for protecting critical infrastructure from sophisticated cyber threats.
Recommended mitigations for this vulnerability include immediate implementation of proper input validation and sanitization checks for all file upload functionalities, mandatory authentication and authorization controls for all system users, and network segmentation to isolate critical industrial control systems from general corporate networks. Additionally, organizations should implement regular security assessments and penetration testing to identify similar vulnerabilities in their industrial control systems, as well as establish incident response procedures specifically tailored for critical infrastructure environments. The vulnerability also highlights the importance of maintaining current firmware versions and implementing proper security configuration management practices for all industrial control system components.