CVE-2022-30040 : What You Need to Know

This article provides an overview of CVE-2022-30040, a Buffer Overflow vulnerability identified in Tenda AX1803 v1.0.0.1_2890 that can lead to a denial of service attack on the router.

Understanding CVE-2022-30040

CVE-2022-30040 is a vulnerability that exists in the rootfs_ in /goform/setsystimecfg of /bin/tdhttpd in ubif file system of Tenda AX1803 v1.0.0.1_2890 routers. Attackers can exploit this issue to trigger a stack buffer overflow by accessing specific HTTP URLs.

What is CVE-2022-30040?

CVE-2022-30040 is a Buffer Overflow vulnerability in Tenda AX1803 routers that allows attackers to achieve a denial of service effect on the device by triggering a stack buffer overflow through manipulation of the ntpserve parameter.

The Impact of CVE-2022-30040

The impact of CVE-2022-30040 is severe as it enables attackers to disrupt the normal operation of Tenda AX1803 routers, leading to a denial of service condition and potential network downtime for users.

Technical Details of CVE-2022-30040

Vulnerability Description

The vulnerability arises due to insufficient input validation in the affected router model, allowing malicious actors to send crafted requests to trigger a buffer overflow in the system, leading to a crash or unresponsive state.

Affected Systems and Versions

CVE-2022-30040 affects Tenda AX1803 routers running firmware version v1.0.0.1_2890. It is crucial for users of this router model to be aware of the vulnerability and take appropriate actions to mitigate the risk.

Exploitation Mechanism

Attackers can exploit CVE-2022-30040 by accessing the specific URL 'http://ip/goform/SetSysTimeCfg' and manipulating the 'ntpserve' parameter to overflow the stack buffer, causing the router to become unresponsive.

Mitigation and Prevention

Immediate Steps to Take

Users of Tenda AX1803 v1.0.0.1_2890 routers are advised to update to a patched firmware version released by the vendor. Additionally, restricting access to the affected URLs and implementing network security measures can help mitigate the risk.

Long-Term Security Practices

To enhance overall security posture, users should follow best practices such as regularly updating firmware, configuring strong passwords, and monitoring network traffic for any suspicious activities.

Patching and Updates

It is crucial for users to keep their Tenda AX1803 routers up to date with the latest security patches provided by the vendor. Regularly checking for firmware updates and applying them promptly is essential to avoid falling victim to known vulnerabilities.