CVE-2021-26562 : Vulnerability Insights and Analysis

A critical Out-of-bounds write vulnerability was discovered in Synology DiskStation Manager (DSM) before version 6.2.3-25426-3, potentially allowing attackers to execute arbitrary code.

Understanding CVE-2021-26562

This CVE identifies a severe vulnerability in Synology DiskStation Manager (DSM) that could be exploited by attackers to run arbitrary code remotely, posing a significant risk to affected systems.

What is CVE-2021-26562?

The CVE-2021-26562 vulnerability involves an out-of-bounds write issue in synoagentregisterd within Synology DiskStation Manager (DSM) versions prior to 6.2.3-25426-3. This flaw may empower threat actors to carry out malicious activities by leveraging the syno_finder_site HTTP header.

The Impact of CVE-2021-26562

With a CVSS base score of 9.0, this critical vulnerability can have a severe impact on confidentiality, integrity, and availability. Attackers can exploit it to execute code and potentially compromise vulnerable systems, highlighting the urgency of remediation.

Technical Details of CVE-2021-26562

This section delves into the technical aspects of CVE-2021-26562, providing insights into the vulnerability description, affected systems, and the exploitation mechanism.

Vulnerability Description

The vulnerability in synoagentregisterd in Synology DSM versions before 6.2.3-25426-3 consists of an out-of-bounds write issue. This flaw enables attackers to inject and execute arbitrary code through the syno_finder_site HTTP header, creating a significant security risk.

Affected Systems and Versions

Synology DiskStation Manager (DSM) versions prior to 6.2.3-25426-3 are impacted by this vulnerability. Users of these versions should take immediate action to mitigate the risk and protect their systems from potential exploitation.

Exploitation Mechanism

The vulnerability allows man-in-the-middle attackers to perform out-of-bounds writes through the syno_finder_site HTTP header. By leveraging this weakness, threat actors can execute arbitrary code remotely, compromising the target system's security.

Mitigation and Prevention

In response to CVE-2021-26562, immediate steps must be taken to secure vulnerable systems and prevent potential exploitation.

Immediate Steps to Take

Users should update Synology DiskStation Manager (DSM) to version 6.2.3-25426-3 or later to remediate the vulnerability. Additionally, network security measures should be enforced to protect against any unauthorized access attempts.

Long-Term Security Practices

Implementing robust security practices, such as regular software updates, network monitoring, and security audits, can enhance overall system security and reduce the risk of similar vulnerabilities in the future.

Patching and Updates

Synology has released patches addressing the CVE-2021-26562 vulnerability. Users are advised to promptly apply these patches to ensure their systems are protected from potential threats.