CVE-2021-21819 : Exploit Details and Defense Strategies
Learn about CVE-2021-21819, a critical code execution vulnerability in D-LINK DIR-3040 1.13B03, allowing attackers to execute arbitrary commands. Explore impact, technical details, and mitigation solutions.
A code execution vulnerability exists in the Libcli Test Environment functionality of D-LINK DIR-3040 1.13B03, allowing arbitrary command execution via specially crafted network requests.
Understanding CVE-2021-21819
This section provides insights into the impact, technical details, and mitigation strategies related to CVE-2021-21819.
What is CVE-2021-21819?
The vulnerability involves improper neutralization of special elements used in an OS command, leading to OS command injection in D-LINK DIR-3040 1.13B03.
The Impact of CVE-2021-21819
With a CVSS base score of 9.1 (Critical), the vulnerability poses a high risk of confidentiality, integrity, and availability impacts with high privileges required and network attack vector.
Technical Details of CVE-2021-21819
In this section, we delve into the vulnerability description, affected systems, versions, and exploitation mechanism.
Vulnerability Description
A crafted network request can trigger the code execution flaw in D-LINK DIR-3040 1.13B03, enabling attackers to execute arbitrary commands.
Affected Systems and Versions
D-LINK DIR-3040 1.13B03 is affected by this vulnerability, potentially impacting systems with this specific version.
Exploitation Mechanism
Attackers exploit this vulnerability by sending a sequence of requests, leveraging the Libcli Test Environment of D-LINK DIR-3040 1.13B03.
Mitigation and Prevention
This section outlines immediate steps, long-term security practices, and the importance of patching and updates.
Immediate Steps to Take
To mitigate the risk, users are advised to apply security patches promptly, monitor network traffic for suspicious activities, and restrict untrusted access.
Long-Term Security Practices
Implementing network segmentation, access controls, regular security assessments, and user awareness training can enhance overall security posture.
Patching and Updates
Regularly updating firmware, network devices, and implementing vendor-recommended security configurations are crucial for addressing vulnerabilities like CVE-2021-21819.