CVE-2021-31755 : What You Need to Know

A stack buffer overflow vulnerability in Tenda AC11 devices with firmware through 02.03.01.104_CN could allow attackers to execute arbitrary code on the system via a crafted post request.

Understanding CVE-2021-31755

This CVE identifies a critical security issue present in Tenda AC11 devices, which can lead to arbitrary code execution.

What is CVE-2021-31755?

CVE-2021-31755 is a stack buffer overflow vulnerability discovered in Tenda AC11 devices running firmware through version 02.03.01.104_CN. The vulnerability exists in the /goform/setmac functionality, allowing malicious actors to execute arbitrary code through specifically crafted post requests.

The Impact of CVE-2021-31755

Exploitation of this vulnerability could result in unauthorized remote code execution on the affected system, potentially granting attackers full control over the device and its data.

Technical Details of CVE-2021-31755

This section provides a detailed overview of the technical aspects related to CVE-2021-31755.

Vulnerability Description

The stack buffer overflow vulnerability in the /goform/setmac feature of Tenda AC11 devices enables threat actors to inject and execute arbitrary code on the device, posing a significant security risk.

Affected Systems and Versions

Tenda AC11 devices with firmware versions up to 02.03.01.104_CN are susceptible to this vulnerability, impacting the security of these devices.

Exploitation Mechanism

Attackers can exploit this vulnerability by sending specially crafted post requests to the /goform/setmac function, triggering the stack buffer overflow and potentially gaining unauthorized access to execute malicious code.

Mitigation and Prevention

To safeguard systems against the CVE-2021-31755 vulnerability, immediate actions and long-term security measures should be implemented.

Immediate Steps to Take

Users and administrators are advised to update the firmware of Tenda AC11 devices to the latest non-vulnerable version provided by the vendor. Furthermore, it is crucial to monitor network traffic for any suspicious activities that may indicate exploitation attempts.

Long-Term Security Practices

Maintaining regular security updates, employing network segregation techniques, and implementing strong access controls are essential for enhancing the overall security posture and mitigating similar vulnerabilities in the future.

Patching and Updates

Vendor-provided patches and firmware updates should be promptly applied to mitigate the risk associated with CVE-2021-31755. Regularly checking for security advisories and conducting vulnerability assessments are recommended to stay proactive against emerging threats.