HTTP Referer Header Validation Bypass in Device Web Interface

Executive Summary

The vulnerability involves the web interface of an affected device relying on the HTTP referrer header for request validation. If the referrer header is empty or missing, the device may still accept and process the request due to weak validation logic.

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Detection Guidance

Check if the web interface accepts requests with missing or empty Referer headers. Use tools like curl to send requests without the Referer header and inspect responses for sensitive data exposure. Example: curl -H 'Referer:' http://<device-ip>

Monitor network traffic for unusual requests to the web management interface. Look for patterns where the Referer header is omitted or empty.

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Impact Analysis

An attacker with access to the web management interface could exploit this to obtain sensitive device configuration details and other confidential information.

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Mitigation Strategies

Disable or restrict access to the web management interface from untrusted networks. Implement network segmentation to limit exposure.

Update the device firmware to a patched version if available. Contact the vendor for security updates addressing this issue.

Enable strict validation for the Referer header on the web interface. Configure the server to reject requests with missing or empty Referer headers.

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