Know the exploit before it knows you.

Summary

A stack-based buffer overflow in the Device-Information CGI (infostat.cgi) of TOTOLINK A950RG firmware v4.1.2cu.5268_B20221104 allows remote attackers to overwrite memory via the CONTENT_LENGTH argument, enabling full system compromise due to lack of input validation and stack protections.

Exploitability

Trivial to exploit remotely without authentication or user interaction, as the vulnerable endpoint is publicly accessible and the attack vector (manipulating CONTENT_LENGTH) is straightforward.

Blast radius

Complete device takeover is likely, enabling full disclosure of sensitive data, unauthorized configuration changes, and potential use as a pivot point to compromise internal networks.

Detection

Look for HTTP POST requests to /infostat.cgi with abnormally large or malformed CONTENT_LENGTH headers exceeding typical device-information request sizes (e.g., >1024 bytes), especially when accompanied by unusual response behavior such as connection resets or service restarts.

Remediation

Upgrade to firmware version 4.1.2cu.5268_B20230101 or later if available; otherwise, immediately disable the infostat.cgi endpoint by removing execute permissions or blocking access via firewall rules until a patch is applied.

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