Stack-Based Buffer Overflow in Totolink X2000R

Executive Summary

This is a stack-based buffer overflow vulnerability in Totolink X2000R firmware affecting the pppoe functionality. It occurs when processing the pppoe_dns2 parameter in HTTP requests. An attacker can send a specially crafted request to overflow the stack, leading to arbitrary code execution. Authentication is required to exploit this vulnerability.

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Detection Guidance

This vulnerability can be detected by monitoring HTTP requests targeting the pppoe_dns2 parameter in Totolink X2000R devices. Check for malformed or unusually long inputs in the pppoe_dns2 field of HTTP requests. Inspect logs for stack-based buffer overflow indicators or crashes in the boa web server process.

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Impact Analysis

An attacker could gain control of the affected device by exploiting this flaw. This may allow them to execute arbitrary commands, install malware, or disrupt network operations. Since the device is a router, compromise could expose all connected systems to further attacks.

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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. Restrict access to the web interface by limiting source IP addresses. Disable PPPoE functionality if not in use. Monitor network traffic for suspicious HTTP requests targeting the pppoe_dns2 parameter.

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