CVE-2021-29083 : Security Advisory and Response

A detailed overview of CVE-2021-29083, a vulnerability in Synology DiskStation Manager (DSM) that allows remote authenticated users to execute arbitrary code via a specific parameter.

Understanding CVE-2021-29083

This section provides insights into the nature and impact of the vulnerability.

What is CVE-2021-29083?

The CVE-2021-29083 vulnerability involves improper neutralization of special elements in an OS command within SYNO.Core.Network.PPPoE in Synology DiskStation Manager (DSM) before version 6.2.3-25426-3. This security flaw can be exploited by remote authenticated users to execute arbitrary code through a specific parameter.

The Impact of CVE-2021-29083

With a CVSS base score of 7.2, this vulnerability poses a high risk. Attackers can leverage this flaw to execute malicious code on affected systems, potentially leading to data confidentiality, integrity, and availability compromises.

Technical Details of CVE-2021-29083

Explore the technical aspects of the CVE-2021-29083 vulnerability to understand how it can affect systems.

Vulnerability Description

The vulnerability stems from a lack of proper validation and sanitization of user inputs, specifically in the realname parameter of SYNO.Core.Network.PPPoE in Synology DSM.

Affected Systems and Versions

Synology DiskStation Manager (DSM) versions prior to 6.2.3-25426-3 are affected by this vulnerability. Users of these versions are advised to upgrade to a secure version to mitigate the risk.

Exploitation Mechanism

Remote authenticated attackers can exploit this vulnerability by crafting malicious inputs containing OS commands within the realname parameter. Upon successful exploitation, attackers can execute unauthorized code on the target system.

Mitigation and Prevention

Discover the necessary steps to protect systems from CVE-2021-29083 and prevent potential security incidents.

Immediate Steps to Take

Users and administrators should immediately update their Synology DSM to version 6.2.3-25426-3 or later to eliminate the vulnerability. Additionally, monitoring for any suspicious activities on the network is recommended.

Long-Term Security Practices

Incorporating strict input validation mechanisms and regular security audits can help prevent similar vulnerabilities in the future. Educating users about safe computing practices is also crucial.

Patching and Updates

Stay informed about security advisories from Synology and promptly apply patches and updates to ensure the continued security of Synology DiskStation Manager (DSM).