Buffer Overflow in TOTOLINK X2000R Router

Executive Summary

This is a stack-based buffer overflow vulnerability in the boa formUploadFile functionality of TOTOLINK X2000R router firmware version TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327. It allows arbitrary code execution when an attacker sends a specially crafted HTTP request. The vulnerability requires authentication to exploit.

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Detection Guidance

To detect this vulnerability, monitor network traffic for HTTP requests targeting the formUploadFile functionality of TOTOLINK X2000R devices. Check for malformed or oversized payloads in HTTP POST requests. Use intrusion detection systems (IDS) to flag unusual file upload patterns or buffer overflow attempts.

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Impact Analysis

An attacker could gain control of your router, steal sensitive data, or use it as a foothold to attack other devices on your network. Since it requires authentication, attackers would need valid credentials, but once exploited, they could execute malicious code with high privileges.

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Compliance Impact

This vulnerability allows arbitrary code execution via a stack-based buffer overflow in the boa formUploadFile functionality. Such vulnerabilities can lead to unauthorized access, data breaches, or system compromise, which may violate compliance requirements under GDPR, HIPAA, or other standards that mandate protection of sensitive data and system integrity.

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Mitigation Strategies

Immediately update the TOTOLINK X2000R firmware to the latest patched version to address the stack-based buffer overflow in formUploadFile. Disable unauthenticated HTTP access if possible and restrict authenticated access to trusted users only.

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