Stack-Based Buffer Overflow in Totolink X2000R Firmware

Executive Summary

This is a stack-based buffer overflow vulnerability in Totolink X2000R firmware version TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327. It exists in the static network configuration functionality, specifically the formIpv6Setup function. A remote attacker can send a crafted HTTP request with a malicious static_dns1 parameter to trigger the overflow, potentially leading to arbitrary code execution. Authentication is required to exploit this vulnerability.

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Detection Guidance

Detecting this vulnerability requires monitoring for unusual HTTP requests targeting the static_dns1 parameter in Totolink X2000R devices. Check web server logs for malformed or excessively long requests to the formIpv6Setup endpoint. Use network traffic analysis tools like tcpdump or Wireshark to inspect HTTP traffic for suspicious payloads.

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Impact Analysis

If exploited, this vulnerability allows an authenticated attacker to execute arbitrary code on the affected device. This could lead to complete compromise of the router, enabling network traffic interception, device control, or further attacks on connected systems. The attacker could gain full administrative access to the router.

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Compliance Impact

This vulnerability allows arbitrary code execution via crafted HTTP requests, 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 the latest patched version. Disable unauthenticated access to the formIpv6Setup endpoint if possible. Restrict network access to the device's web interface using firewalls or network segmentation. Monitor for any signs of exploitation attempts in logs.

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