TOTOLINK EX1200T Buffer Overflow Vulnerability in IPv6 Setup Handler

A critical buffer overflow vulnerability has been identified in the TOTOLINK EX1200T router, specifically in the firmware version 4.1.2cu.5232_B20210713. The issue arises in the HTTP POST request handler for the IPv6 setup form, where the 'submit-url' argument can be manipulated to cause a buffer overflow. This vulnerability can be exploited remotely, potentially leading to a denial-of-service condition.

Impact

Exploitation of this vulnerability causes a buffer overflow, which can commonly lead to arbitrary code execution or a denial-of-service condition.

Reproduction

To reproduce this vulnerability, send a malicious HTTP POST request to the '/boafrm/formIpv6Setup' endpoint, including a crafted 'submit-url' argument that triggers the buffer overflow.