CVE-2021-26564 : Exploit Details and Defense Strategies

A high-severity vulnerability was identified in Synology DiskStation Manager (DSM) before version 6.2.3-25426-3, allowing man-in-the-middle attackers to spoof servers via an HTTP session.

Understanding CVE-2021-26564

This CVE relates to a cleartext transmission of sensitive information vulnerability in synorelayd in Synology DiskStation Manager (DSM) that impacts versions before 6.2.3-25426-3.

What is CVE-2021-26564?

The CVE-2021-26564 vulnerability allows attackers to intercept and manipulate data transmitted over HTTP sessions in Synology DiskStation Manager (DSM) before version 6.2.3-25426-3.

The Impact of CVE-2021-26564

Exploitation of this vulnerability can lead to man-in-the-middle attacks, enabling threat actors to impersonate servers and potentially access sensitive information transmitted over cleartext protocols.

Technical Details of CVE-2021-26564

This section provides detailed technical information about the vulnerability for better understanding.

Vulnerability Description

The vulnerability in synorelayd in Synology DiskStation Manager (DSM) before 6.2.3-25426-3 allows for cleartext transmission of sensitive information, creating a potential security risk for users.

Affected Systems and Versions

Synology DiskStation Manager (DSM) versions earlier than 6.2.3-25426-3 are affected by this vulnerability, exposing users of these versions to the risk of man-in-the-middle attacks.

Exploitation Mechanism

In this context, attackers with network access can exploit the vulnerability to intercept and spoof servers, potentially compromising the confidentiality and integrity of transmitted data.

Mitigation and Prevention

To safeguard systems from the CVE-2021-26564 vulnerability, immediate action is required along with long-term security practices.

Immediate Steps to Take

Users are advised to update Synology DiskStation Manager (DSM) to version 6.2.3-25426-3 or apply patches provided by Synology to mitigate the risk of exploitation.

Long-Term Security Practices

Implementing encryption protocols, practicing secure communication channels, and ensuring regular software updates are crucial for maintaining a secure environment.

Patching and Updates

Regularly check for security advisories from Synology and promptly apply recommended patches and updates to address known vulnerabilities and enhance the security posture of the system.