CVE-2021-27646 Explained : Impact and Mitigation

A detailed overview of the Use After Free vulnerability in Synology DiskStation Manager (DSM) before version 6.2.3-25426-3, allowing remote code execution via crafted web requests.

Understanding CVE-2021-27646

This section delves into the impact, technical details, and mitigation strategies related to CVE-2021-27646.

What is CVE-2021-27646?

CVE-2021-27646 is a Use After Free vulnerability in iscsi_snapshot_comm_core in Synology DiskStation Manager (DSM) before 6.2.3-25426-3. This flaw enables malicious actors to execute arbitrary code through specially crafted web requests.

The Impact of CVE-2021-27646

With a CVSS base score of 9.8 (Critical), this vulnerability has a significant impact. It possesses high confidentiality, integrity, and availability impacts while requiring no special privileges to exploit, making it a severe threat to affected systems.

Technical Details of CVE-2021-27646

Explore the specific technical aspects behind CVE-2021-27646 to understand its nature and implications.

Vulnerability Description

The Use After Free vulnerability in iscsi_snapshot_comm_core permits remote attackers to run arbitrary code on vulnerable systems using malicious web requests.

Affected Systems and Versions

Synology DiskStation Manager (DSM) versions prior to 6.2.3-25426-3 are susceptible to this vulnerability, exposing them to potential exploitation.

Exploitation Mechanism

Remote attackers can leverage this flaw by sending carefully crafted web requests to the affected Synology DSM instances, enabling the execution of arbitrary code.

Mitigation and Prevention

Learn how to protect your systems from CVE-2021-27646 by applying immediate steps and long-term security practices.

Immediate Steps to Take

It is crucial to update Synology DiskStation Manager (DSM) to version 6.2.3-25426-3 or above to patch the Use After Free vulnerability and prevent remote code execution.

Long-Term Security Practices

Implement a robust security posture by regularly updating software, monitoring for unusual network activity, and employing intrusion detection systems to enhance your overall cybersecurity defenses.

Patching and Updates

Stay informed about security advisories and patches from Synology to address vulnerabilities promptly and maintain a secure system environment.