CVE-2021-21956 Explained : Impact and Mitigation

A php unserialize vulnerability exists in the Ai-Bolit functionality of CloudLinux Inc Imunify360 5.10.2, allowing potential arbitrary command execution through a specially crafted malformed file.

Understanding CVE-2021-21956

This CVE involves a vulnerability in CloudLinux Inc Imunify360 that could be exploited by an attacker to execute arbitrary commands.

What is CVE-2021-21956?

The vulnerability in Ai-Bolit functionality of Imunify360 version 5.10.2 allows an attacker to trigger potential arbitrary command execution using a specially-crafted file.

The Impact of CVE-2021-21956

With a CVSS base score of 8.2 (High), this vulnerability poses a significant threat with high confidentiality and integrity impacts, even if the availability impact is rated as "None".

Technical Details of CVE-2021-21956

This section covers details about the vulnerability, affected systems and versions, as well as the exploitation mechanism.

Vulnerability Description

The vulnerability arises from a php unserialize issue in the Ai-Bolit feature of Imunify360 version 5.10.2, enabling attackers to execute arbitrary commands.

Affected Systems and Versions

Imunify360 versions 5.8 and 5.9 are confirmed to be affected by this vulnerability, emphasizing the importance of timely updates and patches.

Exploitation Mechanism

By providing a specially-crafted malformed file, malicious actors can exploit this vulnerability to execute arbitrary commands within the affected system.

Mitigation and Prevention

To safeguard systems from CVE-2021-21956, immediate actions and long-term security measures are essential.

Immediate Steps to Take

Update Imunify360 to a secure version and implement additional security controls to mitigate the risk of unauthorized command execution.

Long-Term Security Practices

Regularly monitor for security updates, conduct thorough vulnerability assessments, and enforce secure coding practices to prevent similar exploits in the future.

Patching and Updates

CloudLinux Inc should release patches promptly to address the vulnerability and protect users from potential exploits.