Stack-Based Buffer Overflow in TOTOLINK X2000R Router

Executive Summary

This is a stack-based buffer overflow vulnerability in the X2000R router from TOTOLINK. It exists in the formFilter functionality and can be triggered by a specially crafted HTTP request. The vulnerability specifically involves the vpnPassword parameter and can lead to arbitrary code execution if exploited.

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Detection Guidance

Detecting this vulnerability requires checking for vulnerable TOTOLINK X2000R devices with firmware version TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327. Inspect HTTP requests targeting the formFilter functionality, particularly those manipulating the vpnPassword parameter. Use network scanning tools to identify affected devices and monitor for unusual HTTP traffic patterns.

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Impact Analysis

An attacker can exploit this vulnerability by making an authenticated HTTP request to the vulnerable device. Successful exploitation could allow the attacker to execute arbitrary code on the device, potentially gaining control over it. This could lead to unauthorized access, data theft, or disruption of network services.

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Compliance Impact

This vulnerability allows arbitrary code execution via a crafted HTTP request targeting the vpnPassword parameter, which could lead to unauthorized access or data breaches. 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 a patched version if available. Disable unauthenticated HTTP access and restrict access to trusted networks. Implement network segmentation to limit exposure. Monitor for suspicious activity and apply strict input validation for HTTP parameters.

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