CVE-2018-16333 : Security Advisory and Response

Tenda AC7, AC9, AC10, AC15, and AC18 routers are vulnerable to a buffer overflow issue in their web server, potentially allowing attackers to execute arbitrary code.

Understanding CVE-2018-16333

This CVE identifies a critical vulnerability in Tenda routers that could lead to a buffer overflow.

What is CVE-2018-16333?

The vulnerability exists in the web server of Tenda routers, specifically in how the ssid parameter is processed for a POST request. This flaw can be exploited to trigger a buffer overflow by manipulating the ssid value.

The Impact of CVE-2018-16333

Exploitation of this vulnerability could allow malicious actors to execute arbitrary code on the affected routers, compromising the security and integrity of the devices and the network they are connected to.

Technical Details of CVE-2018-16333

Tenda routers are susceptible to a buffer overflow due to improper handling of user input.

Vulnerability Description

The vulnerability arises from a buffer overflow in the router's web server when processing the ssid parameter, leading to a stack-based buffer overflow by directly using the value in a sprintf call.

Affected Systems and Versions

Tenda AC7 V15.03.06.44_CN
Tenda AC9 V15.03.05.19(6318)_CN
Tenda AC10 V15.03.06.23_CN
Tenda AC15 V15.03.05.19_CN
Tenda AC18 V15.03.05.19(6318)_CN

Exploitation Mechanism

By crafting a malicious ssid value in a POST request, an attacker can trigger the buffer overflow, potentially leading to remote code execution.

Mitigation and Prevention

It is crucial to take immediate action to secure the affected Tenda routers.

Immediate Steps to Take

Disable remote management access if not required
Implement strong, unique passwords for router administration
Regularly monitor for any unusual network activity

Long-Term Security Practices

Keep router firmware up to date with the latest security patches
Conduct regular security audits and vulnerability assessments
Educate users on best practices for network security

Patching and Updates

Check for firmware updates from Tenda and apply them promptly to mitigate the vulnerability