Tenda CH22 Stack-Based Buffer Overflow Vulnerability in Parameter Handler

A stack-based buffer overflow vulnerability has been identified in the Tenda CH22 router, specifically in version 1.0.0.1. The issue arises in the 'formWebTypeLibrary' function within the '/goform/webtypelibrary' file, part of the Parameter Handler component. The vulnerability is triggered by manipulating the 'webSiteId' parameter, which is not properly validated before being processed, allowing for a buffer overflow that could be exploited remotely. This vulnerability has been publicly disclosed and is accompanied by a proof-of-concept exploit.

Impact

Exploitation of this vulnerability leads to a stack-based buffer overflow, which can commonly result in arbitrary code execution or causing a denial-of-service condition.

Reproduction

The vulnerability can be reproduced by sending a POST request to the '/goform/webtypelibrary' endpoint. The request must include a 'webSiteId' parameter with a payload that exceeds the buffer's capacity, effectively overwriting adjacent memory on the stack.