CVE-2023-40842 : Vulnerability Insights and Analysis

A buffer overflow vulnerability has been identified in Tengda AC6 US_AC6V1.0BR_V15.03.05.16_multi_TD01.bin, specifically in the function "R7WebsSecurityHandler".

Understanding CVE-2023-40842

This CVE identifies a critical buffer overflow vulnerability in the Tengda AC6 router firmware.

What is CVE-2023-40842?

The CVE-2023-40842 exposes a security flaw in the mentioned Tengda router firmware, allowing attackers to trigger a buffer overflow through the function "R7WebsSecurityHandler".

The Impact of CVE-2023-40842

Exploitation of this vulnerability may lead to remote code execution, unauthorized access, or denial of service attacks on the affected device.

Technical Details of CVE-2023-40842

The technical aspects of the CVE-2023-40842 vulnerability are as follows:

Vulnerability Description

The vulnerability arises from improper handling of data within the "R7WebsSecurityHandler" function, leading to a buffer overflow condition.

Affected Systems and Versions

The affected system is the Tengda AC6 router with firmware version US_AC6V1.0BR_V15.03.05.16_multi_TD01.bin.

Exploitation Mechanism

Attackers can exploit this vulnerability by sending specially crafted data to the vulnerable function, causing a buffer overflow and potentially executing malicious code.

Mitigation and Prevention

To mitigate the risks associated with CVE-2023-40842, follow the below steps:

Immediate Steps to Take

Disable remote access to the router if not required.
Implement network segmentation to prevent direct access to the router from untrusted networks.
Regularly monitor network traffic for any suspicious activities.

Long-Term Security Practices

Keep router firmware up to date with the latest security patches.
Implement strong password policies and multi-factor authentication for router access.

Patching and Updates

Check the vendor's official website for any security updates related to the Tengda AC6 router firmware.