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 versions through 4.0.0-B20230721.1521. The vulnerability arises in the HTTP POST request handler for the file '/boafrm/formWlSiteSurvey', where the 'submit-url' argument can be manipulated, leading to a buffer overflow. This vulnerability can be exploited remotely, potentially causing a denial-of-service condition.

Impact

Exploitation of this vulnerability causes a buffer overflow, which can 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/formWlSiteSurvey' endpoint, including a crafted 'submit-url' argument that triggers the buffer overflow.