Buffer Overflow in TOTOLINK X2000R Router

Executive Summary

This is a stack-based buffer overflow vulnerability in the TOTOLINK X2000R router firmware (version TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327). It exists in the boa formIpQos mac functionality and can be triggered by a specially crafted HTTP request. Successful exploitation allows arbitrary code execution due to improper input validation.

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Detection Guidance

Detecting this vulnerability requires monitoring for malformed HTTP requests targeting the formIpQos mac functionality. Check web server logs for unusual POST requests to /cgi-bin/formIpQos or similar endpoints. Use network traffic analysis tools like tcpdump or Wireshark to inspect HTTP traffic for malformed headers or payloads exceeding normal size limits.

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Impact Analysis

An attacker could exploit this to execute arbitrary code on the affected device. This may allow unauthorized access, data theft, or disruption of network services. Since it requires authentication, attackers would need valid credentials to exploit it.

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Compliance Impact

This vulnerability could potentially lead to unauthorized access or data breaches due to arbitrary code execution via crafted HTTP requests. Such breaches may violate GDPR's data protection requirements or HIPAA's safeguards for protected health information if exploited.

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Mitigation Strategies

Immediately update the TOTOLINK X2000R firmware to the latest patched version. Disable remote access to the web interface if not required. Implement network-level controls to block malicious HTTP requests. Monitor for suspicious activity and restrict authenticated access to trusted users only.

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