Tenda M3 Stack-Based Buffer Overflow Vulnerability in formQuickIndex Function

A stack-based buffer overflow vulnerability has been identified in the Tenda M3 router, specifically in version 1.0.0.12. The issue arises in the formQuickIndex function within the file /goform/QuickIndex. The vulnerability is triggered by manipulating the PPPOEPassword parameter, which leads to a stack overflow condition. This vulnerability can be exploited remotely, and a proof-of-concept exploit is publicly 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 on the device.

Reproduction

To reproduce this vulnerability, send a POST request to the /goform/QuickIndex endpoint with a crafted PPPOEPassword parameter. The value should be sufficiently long to overflow the stack-based buffer. Include a cookie with the user set to 'admin' to authenticate the request.