NULL Pointer Dereference in TP-Link TL-MR6400

Executive Summary

This vulnerability is a NULL pointer dereference in the HTTP request parsing function of TL-MR6400 v7. An attacker can exploit it by sending a specially crafted HTTP request with a malformed session cookie header. Successful exploitation may crash the HTTP service, causing a denial-of-service and temporary loss of management or CGI functionality until the service recovers.

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Detection Guidance

Monitor HTTP service crashes or unresponsiveness on TL-MR6400 devices. Check logs for malformed session cookie headers in HTTP requests. Use network scanning tools to detect unusual traffic patterns targeting the HTTP service.

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Impact Analysis

This vulnerability can lead to a denial-of-service condition, disrupting network management and CGI functionality. It may cause temporary loss of access to the device's management interface or web-based controls until the service restarts.

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Compliance Impact

This vulnerability causes a denial-of-service condition by crashing the HTTP service, leading to temporary loss of management or CGI functionality. Such disruptions could impact availability requirements under GDPR and HIPAA, which mandate timely access to systems and data. However, the specific compliance impact depends on the system's role in processing personal or health data.

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Mitigation Strategies

Apply the latest firmware update from TP-Link if available. Disable remote HTTP management if not required. Use a firewall to block malformed HTTP requests targeting the session cookie header.

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