U-SPEED N300 Wireless Router Denial-of-Service Vulnerability

A denial-of-service vulnerability exists in the U-SPEED N300 wireless router running firmware version 1.0.0. The issue arises when a large number of concurrent HTTP requests are sent to random or non-existent endpoints on the web management interface. This flood of requests exhausts system resources in the embedded Boa HTTP server, causing the router's web interface to become unresponsive. Users may need to manually reboot the router to restore normal operation.

Impact

Exploitation of this vulnerability causes the web management interface to become unresponsive, disrupting routing services and requiring a manual reboot to restore functionality.

Reproduction

The vulnerability can be reproduced by sending a high volume of concurrent HTTP requests to the router's web management interface, targeting random or non-existent endpoints. This can be done using a script that automates the process, such as one written in Python that utilizes the 'requests' library and 'threading' module to send multiple requests at once.

Remediation

To address this vulnerability, it is recommended to implement connection rate limiting on the Boa web server, restrict the maximum number of concurrent connections per source IP, and introduce an automatic recovery or watchdog mechanism.