CVE-2018-17533 in RUT9XX
Summary
by MITRE
Teltonika RUT9XX routers with firmware before 00.05.01.1 are prone to cross-site scripting vulnerabilities in hotspotlogin.cgi due to insufficient user input sanitization.
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Analysis
by VulDB Data Team • 05/25/2023
The Teltonika RUT9XX series routers represent a line of industrial-grade networking equipment designed for remote monitoring and management applications in various sectors including telecommunications, energy, and transportation. These devices operate as robust gateways that provide connectivity solutions for remote locations where traditional network infrastructure may be limited or unavailable. The vulnerability identified in CVE-2018-17533 specifically affects firmware versions prior to 00.05.01.1, indicating that this issue was present in a significant portion of the deployed hardware base. The affected component hotspotlogin.cgi serves as a critical interface for managing wireless hotspot authentication and user access control, making it a prime target for malicious actors seeking unauthorized network access. This particular vulnerability falls under the CWE-79 category of Cross-Site Scripting, which represents one of the most prevalent and dangerous web application security flaws in the cybersecurity landscape.
The technical flaw manifests through inadequate input sanitization within the hotspotlogin.cgi script that handles user authentication parameters. When users interact with the hotspot login interface, the router fails to properly validate or escape user-supplied data before incorporating it into dynamic web responses. This omission allows attackers to inject malicious script code through carefully crafted input fields, typically including username, password, or other authentication parameters. The vulnerability specifically affects the router's web-based management interface, which means that successful exploitation could occur through standard web browser interactions without requiring specialized tools or direct network access. The lack of proper input validation creates a persistent vector where malicious payloads can be executed in the context of the router's administrative interface, potentially compromising the entire device and its network operations.
The operational impact of this vulnerability extends beyond simple web application compromise, as it fundamentally undermines the security posture of industrial networking equipment deployed in critical infrastructure environments. An attacker who successfully exploits this vulnerability could potentially gain unauthorized access to the router's administrative functions, allowing them to modify network configurations, redirect traffic, or even establish persistent backdoors for future access. The implications are particularly severe given that these routers are commonly deployed in remote locations where physical access is limited, making remote exploitation particularly dangerous. The vulnerability could enable attackers to disrupt critical network services, compromise data integrity, or serve as a stepping stone for broader network infiltration activities. Organizations relying on these devices for remote monitoring and management operations face significant risk exposure, especially in sectors where network reliability and security are paramount to operational continuity.
Mitigation strategies for this vulnerability require immediate firmware updates to version 00.05.01.1 or later, which Teltonika has specifically provided to address this security gap. Network administrators should conduct comprehensive inventory assessments to identify all affected devices within their infrastructure and prioritize remediation efforts based on risk exposure levels. Additional protective measures include implementing network segmentation to isolate affected routers from critical systems, deploying web application firewalls to monitor and filter malicious traffic, and establishing robust monitoring protocols to detect unusual authentication patterns. The ATT&CK framework categorizes this vulnerability under the T1059.007 technique for script injection, emphasizing the need for proper input validation and output encoding practices. Organizations should also consider implementing network access controls that limit administrative access to these devices and establish strict change management procedures for router configuration modifications. Regular security assessments and vulnerability scanning should be conducted to identify similar issues in other network infrastructure components, as this vulnerability demonstrates the critical importance of input validation in embedded systems and industrial control networks.