Executive Summary

The Tenda AC7 router firmware version V03.03.03.01_cn and earlier contains a reflected Cross-Site Scripting (XSS) vulnerability. This occurs because the web management interface improperly encodes output, reflecting user-supplied input in HTTP responses without adequate escaping.

As a result, an attacker can inject arbitrary HTML or JavaScript code into the victim’s browser context, potentially causing malicious script execution.

This vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation) and has a medium severity level with a CVSS v4 base score of 5.1.

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Impact Analysis

[{'type': 'paragraph', 'content': "This vulnerability allows an attacker to execute arbitrary HTML or JavaScript code in the context of a victim’s browser when interacting with the router's web management interface."}, {'type': 'paragraph', 'content': 'Potential impacts include theft of sensitive information, session hijacking, or performing actions on behalf of the user without their consent.'}, {'type': 'paragraph', 'content': 'The vulnerability can be exploited remotely over the network without requiring privileges, but it does require user interaction.'}] [2]

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Detection Guidance

[{'type': 'paragraph', 'content': 'This vulnerability can be detected by testing the web management interface of the Tenda AC7 router firmware version V03.03.03.01_cn and earlier for reflected Cross-Site Scripting (XSS) issues. Specifically, by injecting typical XSS payloads into input fields or URL parameters and observing if the input is reflected unescaped in the HTTP response.'}, {'type': 'list_item', 'content': "Use curl or similar tools to send HTTP requests with XSS payloads to the router's web interface and inspect the response for unescaped input."}, {'type': 'list_item', 'content': 'Example command: curl -i -k "http://<router-ip>/path?param=<script>alert(1)</script>"'}, {'type': 'list_item', 'content': 'Check the HTTP response for the presence of the injected script tag without proper encoding or escaping.'}, {'type': 'list_item', 'content': "Alternatively, use web vulnerability scanners that test for reflected XSS vulnerabilities on the router's web interface."}] [2]

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Mitigation Strategies

[{'type': 'paragraph', 'content': 'Immediate mitigation steps include:'}, {'type': 'list_item', 'content': 'Avoid using the vulnerable web management interface from untrusted networks or browsers.'}, {'type': 'list_item', 'content': "Restrict access to the router's web interface to trusted IP addresses or local network only."}, {'type': 'list_item', 'content': 'Disable remote management features if enabled.'}, {'type': 'list_item', 'content': 'Monitor for firmware updates from Tenda that address this vulnerability and apply them as soon as they become available.'}, {'type': 'list_item', 'content': 'Use network-level protections such as web application firewalls or intrusion detection systems to detect and block XSS attack attempts.'}] [2]

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Compliance Impact

I don't know

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