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 within the HTTP POST request handler, in the file '/boafrm/formSysLog'. The vulnerability is triggered by manipulating the 'submit-url' argument, which leads to a buffer overflow. This vulnerability can be exploited remotely, and a public exploit is available.

Impact

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

Reproduction

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