UTT HiPER 840G Buffer Overflow Vulnerability in Web Host Filter

A critical buffer overflow vulnerability has been identified in the UTT HiPER 840G router, affecting versions through 3.1.1-190328. The issue arises in the file '/goform/websWhiteList', where the 'addHostFilter' parameter can be manipulated, leading to a buffer overflow. This vulnerability can be exploited remotely, and a public proof-of-concept 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

The vulnerability can be reproduced by sending a crafted request to the '/goform/websWhiteList' endpoint, manipulating the 'addHostFilter' parameter to exceed the buffer size, which triggers the overflow condition.