CVE-2021-43929 : Exploit Details and Defense Strategies

A vulnerability in Synology DiskStation Manager (DSM) before version 7.0.1-42218-2 allows remote authenticated users to inject arbitrary web script or HTML, posing a risk to affected systems.

Understanding CVE-2021-43929

This CVE involves an 'Improper Neutralization of Special Elements in Output Used by a Downstream Component' vulnerability in Synology DSM.

What is CVE-2021-43929?

The CVE-2021-43929 vulnerability in Synology DSM allows remote authenticated users to inject arbitrary web script or HTML due to improper neutralization of special elements in output used by a downstream component.

The Impact of CVE-2021-43929

The vulnerability poses a medium severity threat with a CVSS base score of 6.5. It has low impact on confidentiality, integrity, and availability, with low privileges required for exploitation.

Technical Details of CVE-2021-43929

This section delves into the technical aspects of the CVE.

Vulnerability Description

The vulnerability involves an injection flaw in work flow management in Synology DSM, enabling remote authenticated users to inject arbitrary web script or HTML.

Affected Systems and Versions

Product: Synology DiskStation Manager (DSM)
Vendor: Synology
Vulnerable Version: Before 7.0.1-42218-2

Exploitation Mechanism

The vulnerability allows remote authenticated users to exploit the injection flaw via unspecified vectors.

Mitigation and Prevention

Steps to address and prevent exploitation of the CVE.

Immediate Steps to Take

Update Synology DSM to version 7.0.1-42218-2 or later.
Monitor system logs for any suspicious activities.
Restrict network access to the affected systems.

Long-Term Security Practices

Implement strong authentication mechanisms.
Regularly audit and review system configurations.
Educate users on safe computing practices.

Patching and Updates

Apply security patches promptly and keep systems up to date.