Tenda F1202 Stack-Based Buffer Overflow Vulnerability in WrlExtraSet Function

A stack-based buffer overflow vulnerability has been identified in the Tenda F1202 router, specifically in version 1.2.0.20(408). The issue arises in the WrlExtraSet function, where user-supplied data is not properly validated before being passed to a vulnerable function. This flaw allows for remote exploitation, potentially leading to a denial-of-service condition or arbitrary code execution.

Impact

Exploitation of this vulnerability causes a stack-based buffer overflow, which can be leveraged to execute arbitrary code or cause a denial-of-service condition.

Reproduction

The vulnerability can be reproduced by sending a POST request to the /goform/WrlExtraSet endpoint. The request must include a 'GO' parameter with a payload that exceeds the buffer's capacity, causing a stack-based overflow.