CVE-2018-7277 in Wi-MGR
Summary
by MITRE
An issue was discovered on RLE Wi-MGR/FDS-Wi 6.2 devices. Persistent XSS exists in the web server. Remote attackers can inject malicious JavaScript code using the device's BACnet implementation. This is similar to a Cross Protocol Injection with SNMP.
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Analysis
by VulDB Data Team • 01/07/2020
The vulnerability identified as CVE-2018-7277 affects RLE Wi-MGR/FDS-Wi 6.2 network devices, representing a critical persistent cross-site scripting flaw within the device's web server interface. This security weakness stems from inadequate input validation and output encoding mechanisms that fail to properly sanitize user-supplied data before processing it through the BACnet protocol implementation. The vulnerability manifests when remote attackers exploit the device's web interface to inject malicious JavaScript code that persists in the system's storage, allowing the malicious payload to execute whenever legitimate users access the affected web server pages.
The technical exploitation of this vulnerability occurs through the device's BACnet implementation, which serves as an entry point for attackers to inject malicious code into the web server environment. This particular flaw demonstrates characteristics similar to cross-protocol injection attacks commonly observed with SNMP implementations, where protocols designed for network management and device communication become vectors for web-based attacks. The BACnet protocol's integration with the web server creates an attack surface where malicious input can bypass traditional web application security controls and persist within the device's storage mechanisms.
From an operational impact perspective, this vulnerability presents significant risks to industrial control systems and building automation environments where RLE Wi-MGR/FDS-Wi devices are deployed. Remote attackers can execute arbitrary JavaScript code in the context of the victim's browser, potentially leading to session hijacking, credential theft, or further exploitation of the network infrastructure. The persistent nature of the XSS vulnerability means that malicious code remains active even after the initial injection, continuously affecting any user who accesses the compromised web interface. This characteristic transforms what might initially appear as a simple web application vulnerability into a persistent threat that can compromise multiple users over time.
The vulnerability aligns with CWE-79, which specifically addresses cross-site scripting flaws in web applications, and demonstrates characteristics consistent with ATT&CK technique T1212, which involves exploitation of web application vulnerabilities for persistent access. Organizations deploying these devices face risks of unauthorized access to critical infrastructure monitoring interfaces, potential data exfiltration, and possible escalation to broader network compromise. The attack vector through BACnet protocol integration creates a unique challenge for security teams, as it requires understanding both traditional web application security controls and industrial protocol security considerations.
Mitigation strategies should focus on implementing comprehensive input validation and output encoding mechanisms within the web server components of these devices. Network segmentation and access controls should be enforced to limit exposure of these devices to untrusted networks. Regular firmware updates and security patches should be applied promptly, while network monitoring should be enhanced to detect anomalous BACnet traffic patterns that might indicate exploitation attempts. Security awareness training for personnel managing these industrial systems should include recognition of potential cross-protocol injection attack vectors. Additionally, organizations should consider implementing web application firewalls and conducting regular security assessments specifically targeting industrial protocol implementations to prevent similar vulnerabilities from being exploited in operational technology environments.