CVE-2021-31757 : Vulnerability Insights and Analysis

This CVE-2021-31757 article provides an in-depth analysis of a stack buffer overflow vulnerability found in Tenda AC11 devices with firmware through 02.03.01.104_CN, allowing attackers to execute arbitrary code via a crafted post request.

Understanding CVE-2021-31757

This section delves into the details surrounding CVE-2021-31757 and its implications.

What is CVE-2021-31757?

CVE-2021-31757 relates to a stack buffer overflow vulnerability present in Tenda AC11 devices. Attackers can exploit this issue by employing a crafted post request, potentially enabling the execution of arbitrary code on the affected system.

The Impact of CVE-2021-31757

The exploitation of CVE-2021-31757 poses a significant risk to the security of Tenda AC11 devices, potentially leading to unauthorized remote code execution and system compromise.

Technical Details of CVE-2021-31757

This section provides a detailed breakdown of the technical aspects surrounding CVE-2021-31757.

Vulnerability Description

The vulnerability arises due to a stack buffer overflow in the /goform/setVLAN function of Tenda AC11 devices running firmware through version 02.03.01.104_CN. This flaw permits threat actors to trigger unauthorized code execution through the use of specially crafted post requests.

Affected Systems and Versions

Tenda AC11 devices up to and including firmware version 02.03.01.104_CN are affected by CVE-2021-31757, leaving them susceptible to exploitation.

Exploitation Mechanism

Exploiting this vulnerability involves sending a carefully manipulated post request to the /goform/setVLAN function of the targeted Tenda AC11 device. Successful exploitation could grant attackers the ability to execute arbitrary code on the system.

Mitigation and Prevention

This section outlines the necessary steps to mitigate the risks associated with CVE-2021-31757.

Immediate Steps to Take

Users of Tenda AC11 devices are advised to apply security patches promptly upon release to address the vulnerability and prevent potential exploitation. Additionally, implementing network-level protections can help mitigate the risk of unauthorized access.

Long-Term Security Practices

Ensuring that devices are regularly updated with the latest firmware and security patches is crucial for safeguarding against known vulnerabilities. Moreover, network segmentation and access control mechanisms can enhance overall security posture.

Patching and Updates

Vendor-issued patches and firmware updates should be diligently applied to Tenda AC11 devices to remediate the vulnerability identified in CVE-2021-31757, thereby reducing the risk of exploitation and unauthorized code execution.