Stack-Based Buffer Overflow in Totolink X2000R

Executive Summary

This vulnerability is a stack-based buffer overflow in the Totolink X2000R router's formIpv6Setup functionality. It occurs when processing the static_ipv6 parameter in HTTP requests. An attacker can exploit this by sending a specially crafted request to execute arbitrary code on the device.

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Detection Guidance

Detecting this vulnerability requires monitoring for unusual HTTP requests targeting the static_ipv6 parameter in Totolink X2000R devices. Check web server logs for malformed or excessively long IPv6 address strings in HTTP POST/GET requests to /cgi-bin/formIpv6Setup. Use network traffic analysis tools like tcpdump or Wireshark to capture and inspect HTTP traffic for patterns matching the vulnerable parameter.

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Impact Analysis

An attacker could gain control of the router, allowing them to intercept network traffic, install malware, or launch further attacks on connected devices. Since it requires authentication, attackers must first gain access to the router's admin interface.

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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, depending on the affected system's use case.

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Mitigation Strategies

Immediately update the Totolink X2000R firmware to the latest patched version. If no patch is available, restrict access to the device's web interface via network segmentation or firewall rules. Disable IPv6 static configuration features if not required. Monitor for unauthorized access attempts and consider isolating the device from critical network segments.

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