CVE-2021-43928 : Security Advisory and Response

CVE-2021-43928, discovered on March 11, 2022, involves an OS Command Injection vulnerability in Synology Mail Station before version 20211105-10315.

Understanding CVE-2021-43928

CVE-2021-43928 is a critical vulnerability that allows remote authenticated users to execute arbitrary commands through the mail sending and receiving component in Synology Mail Station.

What is CVE-2021-43928?

The CVE-2021-43928 vulnerability stems from improper neutralization of special elements used in OS commands, leading to command injection, a severe security risk that enables unauthorized command execution.

The Impact of CVE-2021-43928

The vulnerability poses a high risk to confidentiality, integrity, and availability, with a CVSS base score of 9.9 (Critical).

Technical Details of CVE-2021-43928

This section covers specific technical aspects to understand the nature of the CVE-2021-43928 vulnerability.

Vulnerability Description

Type: OS Command Injection (CWE-78)
Allows: Arbitrary command execution
Component: Synology Mail Station

Affected Systems and Versions

Product: Mail Station
Vendor: Synology
Vulnerable Versions: Before 20211105-10315

Exploitation Mechanism

The vulnerability can be exploited remotely by authenticated users via unspecified vectors to execute unauthorized commands.

Mitigation and Prevention

Protect your systems and data by following these security measures:

Immediate Steps to Take

Apply security patches promptly
Monitor for any unauthorized access
Restrict network access to essential users

Long-Term Security Practices

Conduct regular security assessments and audits
Implement strong access controls and authentication mechanisms

Patching and Updates

Update Synology Mail Station to version 20211105-10315 or later to mitigate the vulnerability.