TOTOLINK A702R Buffer Overflow Vulnerability in HTTP POST Request Handler

A critical buffer overflow vulnerability has been identified in the TOTOLINK A702R router, specifically in version 4.0.0-B20230721.1521. The issue arises in an unknown function of the file '/boafrm/formFilter', within the HTTP POST request handler component. The vulnerability is triggered by manipulating the 'ip6addr' argument, which leads to a stack-based buffer overflow. This vulnerability can be exploited remotely, and a public exploit is available.

Impact

Exploitation of this vulnerability causes a stack-based buffer overflow, which can lead to arbitrary code execution or a denial-of-service condition by crashing the device.

Reproduction

The vulnerability can be reproduced by sending a crafted HTTP POST request to the '/boafrm/formFilter' endpoint. The request must include a 'sessionCheck' parameter and the 'ip6addr' argument with a payload that exceeds the buffer size, causing a buffer overflow.