CVE-2021-26561 Explained : Impact and Mitigation
Learn about CVE-2021-26561, a critical stack-based buffer overflow vulnerability in Synology DiskStation Manager (DSM) versions prior to 6.2.3-25426-3. Explore its impact, technical details, and mitigation steps.
A stack-based buffer overflow vulnerability in Synology DiskStation Manager (DSM) before version 6.2.3-25426-3 has been identified, allowing attackers to execute arbitrary code. This CVE was made public on February 26, 2021.
Understanding CVE-2021-26561
This section delves into the specifics of the CVE-2021-26561 vulnerability.
What is CVE-2021-26561?
The CVE-2021-26561 vulnerability refers to a stack-based buffer overflow in the 'synoagentregisterd' component of Synology DiskStation Manager (DSM) versions prior to 6.2.3-25426-3. It permits man-in-the-middle attackers to run malicious code using the 'syno_finder_site' HTTP header.
The Impact of CVE-2021-26561
With a CVSS base score of 9.0 (Critical severity), this vulnerability can have a high impact on confidentiality, integrity, and availability, making it crucial to address promptly.
Technical Details of CVE-2021-26561
Explore the technical aspects related to CVE-2021-26561 below.
Vulnerability Description
The vulnerability arises from a stack-based buffer overflow, a Common Weakness Enumeration (CWE-121), enabling attackers to trigger the execution of arbitrary code remotely.
Affected Systems and Versions
Synology DiskStation Manager (DSM) versions earlier than 6.2.3-25426-3 are impacted by this vulnerability, necessitating immediate attention from users of these versions.
Exploitation Mechanism
The exploitation of CVE-2021-26561 involves utilizing a man-in-the-middle attack to inject and execute arbitrary code via the 'syno_finder_site' HTTP header.
Mitigation and Prevention
Discover the essential steps to mitigate and prevent the CVE-2021-26561 vulnerability.
Immediate Steps to Take
Users should upgrade their Synology DSM to version 6.2.3-25426-3 or newer to patch the vulnerability and prevent potential exploitation.
Long-Term Security Practices
Adopting strict network security measures, including monitoring for anomalous activities and keeping systems up-to-date, can enhance overall security posture.
Patching and Updates
Regularly check for security updates from Synology and apply patches promptly to safeguard against known vulnerabilities.