CVE-2021-26569 : Exploit Details and Defense Strategies

A Race Condition within a Thread vulnerability in iscsi_snapshot_comm_core in Synology DiskStation Manager (DSM) before 6.2.3-25426-3 allows remote attackers to execute arbitrary code via crafted web requests.

Understanding CVE-2021-26569

This CVE describes a critical vulnerability in Synology DiskStation Manager (DSM) that can be exploited by remote attackers to execute arbitrary code.

What is CVE-2021-26569?

CVE-2021-26569 is a Race Condition within a Thread vulnerability in Synology DiskStation Manager (DSM) that allows attackers to execute arbitrary code through specially crafted web requests.

The Impact of CVE-2021-26569

The impact of this vulnerability is rated as critical, with a base score of 9.8, posing a high risk to confidentiality, integrity, and availability of affected systems.

Technical Details of CVE-2021-26569

This section provides technical details about the vulnerability in Synology DiskStation Manager (DSM) before version 6.2.3-25426-3.

Vulnerability Description

The vulnerability stems from a race condition within a thread in the iscsi_snapshot_comm_core component, allowing remote attackers to achieve code execution.

Affected Systems and Versions

The affected product is Synology DiskStation Manager (DSM) with versions below 6.2.3-25426-3. Custom versions are also impacted by this vulnerability.

Exploitation Mechanism

Remote attackers can exploit this vulnerability by sending specially crafted web requests to the affected Synology DiskStation Manager (DSM) instances.

Mitigation and Prevention

To safeguard systems from CVE-2021-26569 and prevent potential exploitation, follow these mitigation measures:

Immediate Steps to Take

Users are advised to update their Synology DiskStation Manager (DSM) to version 6.2.3-25426-3 or above to eliminate the vulnerability.

Long-Term Security Practices

Implement regular security updates for all software components and conduct thorough security assessments to identify and resolve vulnerabilities.

Patching and Updates

Stay informed about security advisories from Synology and other relevant sources to apply patches promptly and enhance the security posture of your system.