Stack-Based Buffer Overflow in TOTOLINK X2000R

Executive Summary

This is a stack-based buffer overflow in the batchupg 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

Detecting this vulnerability requires monitoring for unusual HTTP requests targeting the batchupg functionality. Check web server logs for POST or GET requests to paths containing 'batchupg' with large payloads. Use network traffic analysis tools like Wireshark to inspect HTTP traffic for malformed requests. Ensure intrusion detection systems (IDS) are updated to flag suspicious patterns.

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Impact Analysis

An attacker could gain control of the affected router, potentially leading to network compromise, data theft, or further attacks within the local network. Since it requires authentication, attackers would need valid credentials to exploit it.

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Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating GDPR and HIPAA requirements for data protection. Organizations using this device may face compliance violations and potential legal consequences.

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Mitigation Strategies

Immediately update the X2000R firmware to the latest patched version if available. Disable the batchupg functionality if not required. Restrict access to the web interface via network segmentation or firewall rules. Monitor for exploitation attempts and apply network-level mitigations like rate limiting on HTTP requests.

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