CVE-2020-27648 : Security Advisory and Response
Learn about CVE-2020-27648, an improper certificate validation vulnerability in Synology DiskStation Manager (DSM) allowing man-in-the-middle attacks. Find mitigation steps and preventive measures here.
A vulnerability in Synology DiskStation Manager (DSM) before version 6.2.3-25426-2 could allow man-in-the-middle attackers to spoof servers and access sensitive information.
Understanding CVE-2020-27648
This CVE involves an improper certificate validation vulnerability in the OpenVPN client within Synology DiskStation Manager (DSM) software.
What is CVE-2020-27648?
The vulnerability in the OpenVPN client in Synology DSM prior to version 6.2.3-25426-2 enables attackers to impersonate servers and acquire confidential data using a specially crafted certificate.
The Impact of CVE-2020-27648
The vulnerability has a CVSS base score of 8.3, indicating a high severity level with significant impacts on confidentiality, integrity, and availability of affected systems.
Technical Details of CVE-2020-27648
This section provides more in-depth technical insights into the vulnerability.
Vulnerability Description
The flaw allows man-in-the-middle attackers to deceive users by presenting a fake server using a malicious certificate, leading to the disclosure of sensitive information.
Affected Systems and Versions
- Product: DiskStation Manager (DSM)
- Vendor: Synology
- Versions Affected: Before 6.2.3-25426-2
Exploitation Mechanism
The vulnerability can be exploited by attackers intercepting communication between the OpenVPN client and server, leveraging a crafted certificate to deceive the client.
Mitigation and Prevention
Protecting systems from this vulnerability requires immediate actions and long-term security measures.
Immediate Steps to Take
- Update Synology DSM to version 6.2.3-25426-2 or later to mitigate the vulnerability.
- Monitor network traffic for any suspicious activities that could indicate exploitation.
Long-Term Security Practices
- Implement strong certificate validation mechanisms to prevent similar attacks in the future.
- Regularly review and update security configurations to address emerging threats.
Patching and Updates
- Stay informed about security advisories from Synology and promptly apply patches to address known vulnerabilities.