Improper Authentication in Tenda AC10 Router Firmware

Executive Summary

This vulnerability is an authentication bypass flaw in the Tenda AC10 router's web management interface. It exists in the R7WebsSecurityHandler component due to inconsistent URL handling. The security check compares raw URLs including query strings against a whitelist, while authentication logic uses URLs without query strings. Attackers can exploit this by adding a whitelisted string like ?reasy-ui-1.0.3.js to any request URL to bypass authentication and access protected features.

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Detection Guidance

To detect this vulnerability, check if unauthenticated requests to the Tenda AC10 web interface return HTTP 200 instead of redirecting to a login page (HTTP 302). Test by appending whitelisted strings like '?reasy-ui-1.0.3.js' or '?img/main-logo.png' to any URL. If successful responses are received without authentication, the vulnerability is likely present.

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Impact Analysis

An attacker could gain unauthorized access to your Tenda AC10 router's administrative functions. This includes downloading configurations, viewing logs, upgrading firmware, or changing settings without authentication. The impact ranges from network compromise to complete device takeover if remote management is enabled.

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Compliance Impact

This vulnerability allows unauthenticated remote attackers to bypass authentication and access sensitive administrative functions, which could lead to unauthorized data access or modification. For GDPR, this may violate principles of data protection and integrity, potentially resulting in unauthorized processing or disclosure of personal data. For HIPAA, it could compromise the confidentiality, integrity, or availability of protected health information by allowing unauthorized access to systems handling such data.

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Mitigation Strategies

Immediately disable remote management on the Tenda AC10 if enabled. Update the router to the latest firmware version if a patch is available. Block external access to the web interface via firewall rules. Monitor network traffic for suspicious requests targeting the web interface.

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