Authentication Bypass in Fanvil x7a Firmware

Executive Summary

The Fanvil x7a device's websocket handler in firmware version 2.6.0.1182 lacks proper authentication checks for sessionless users. This allows unauthorized individuals to access device resources like operational logs or execute diagnostic commands without valid credentials.

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Detection Guidance

Since the vulnerability involves unauthenticated access to device resources via the websocket handler, check for unauthorized websocket connections to the Fanvil x7a device on port 80 or 443. Monitor logs for unexpected diagnostic requests or resource access attempts from unknown IPs.

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Impact Analysis

An attacker could exploit this to view sensitive device logs or run unauthorized diagnostic requests, potentially leading to information disclosure or device misuse. This may disrupt operations or expose confidential data.

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Compliance Impact

This vulnerability could violate compliance requirements by enabling unauthorized access to sensitive data, such as logs containing personal or health information. Organizations may face penalties for failing to protect such data under GDPR or HIPAA.

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Mitigation Strategies

Immediately update the Fanvil x7a firmware to the latest version that enforces proper authentication restrictions. Disable or restrict access to the websocket handler from untrusted networks until the update is applied.

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