CVE-2021-27647 : Vulnerability Insights and Analysis

A detailed overview of CVE-2021-27647, a critical Out-of-bounds Read vulnerability in Synology DiskStation Manager (DSM) before version 6.2.3-25426-3, allowing remote attackers to execute arbitrary code.

Understanding CVE-2021-27647

This section explores the impact, technical details, and mitigation strategies for CVE-2021-27647.

What is CVE-2021-27647?

CVE-2021-27647 is an Out-of-bounds Read vulnerability in the iscsi_snapshot_comm_core component of Synology DiskStation Manager (DSM) prior to version 6.2.3-25426-3. It enables remote attackers to execute arbitrary code through manipulated web requests.

The Impact of CVE-2021-27647

With a CVSS base score of 9.8 (Critical), this vulnerability has a high impact on confidentiality, integrity, and availability. Attackers can exploit it over the network without user interaction, potentially leading to serious security breaches.

Technical Details of CVE-2021-27647

Let's delve into the specifics of the vulnerability, the affected systems, and the exploitation mechanism.

Vulnerability Description

The vulnerability arises in the iscsi_snapshot_comm_core in Synology DSM, allowing attackers to read data beyond the bounds of an allocated memory buffer due to improper input validation.

Affected Systems and Versions

Synology DiskStation Manager versions prior to 6.2.3-25426-3 are susceptible to this security flaw. Users of the affected systems are at risk of exploitation by remote threat actors.

Exploitation Mechanism

Remote attackers can exploit this vulnerability by sending maliciously crafted web requests to the target system, triggering the out-of-bounds read and potentially executing arbitrary code.

Mitigation and Prevention

Discover the essential steps to mitigate the risks posed by CVE-2021-27647 and secure your systems effectively.

Immediate Steps to Take

Users are strongly advised to update their Synology DiskStation Manager to version 6.2.3-25426-3 or later to address this vulnerability. Network administrators should monitor for any anomalous activities that might indicate exploitation attempts.

Long-Term Security Practices

Implementing robust network security measures, such as network segmentation, access controls, and intrusion detection systems, can enhance overall resilience against cyber threats.

Patching and Updates

Regularly applying security patches and updates from Synology is crucial to ensuring ongoing protection against known vulnerabilities and emerging cyber risks.