CVE-2020-27656 Explained : Impact and Mitigation

A vulnerability in Synology DiskStation Manager (DSM) before version 6.2.3-25426-2 could allow attackers to intercept sensitive information during DDNS communication.

Understanding CVE-2020-27656

This CVE involves a cleartext transmission vulnerability in DDNS within Synology DSM, potentially enabling man-in-the-middle attacks.

What is CVE-2020-27656?

The vulnerability in Synology DSM prior to version 6.2.3-25426-2 allows attackers to eavesdrop on authentication data of DNSExit through unspecified means.

The Impact of CVE-2020-27656

The vulnerability has a CVSS base score of 6.5, indicating a medium severity issue with high attack complexity and network-based attack vector. While the confidentiality, integrity, and availability impacts are low, the exploit does not require privileges or user interaction.

Technical Details of CVE-2020-27656

This section delves into the specifics of the vulnerability.

Vulnerability Description

The flaw permits man-in-the-middle attackers to intercept authentication details of DNSExit due to cleartext transmission in DDNS within Synology DSM.

Affected Systems and Versions

Product: DiskStation Manager (DSM)
Vendor: Synology
Versions Affected: < 6.2.3-25426-2 (unspecified/custom)

Exploitation Mechanism

The vulnerability can be exploited through network-based attacks with high complexity, allowing interception of sensitive information during DDNS communication.

Mitigation and Prevention

Protecting systems from CVE-2020-27656 requires immediate actions and long-term security practices.

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 signs of unauthorized access or data interception.

Long-Term Security Practices

Implement encryption protocols for sensitive data transmission to prevent eavesdropping.
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.