CVE-2021-42021 Explained : Impact and Mitigation

A vulnerability has been identified in Siveillance Video DLNA Server versions 2019 R1, 2019 R2, 2019 R3, 2020 R1, 2020 R2, 2020 R3, and 2021 R1. The vulnerability allows an unauthenticated remote attacker to perform path traversal attacks, potentially leading to unauthorized access to sensitive files.

Understanding CVE-2021-42021

This CVE discloses a critical vulnerability in Siemens' Siveillance Video DLNA Server, allowing attackers to read arbitrary files on the server via a path traversal exploit.

What is CVE-2021-42021?

The vulnerability found in various versions of the Siveillance Video DLNA Server allows unauthenticated remote attackers to access files outside the web document directory, posing a significant security risk.

The Impact of CVE-2021-42021

The vulnerability can be exploited by attackers to gain access to sensitive information stored on the server, potentially leading to further malicious activities.

Technical Details of CVE-2021-42021

Siemens' Siveillance Video DLNA Server is affected by a critical path traversal vulnerability, enabling unauthorized access to files.

Vulnerability Description

The vulnerability allows unauthenticated remote attackers to read arbitrary files on the server through a path traversal exploit.

Affected Systems and Versions

Siveillance Video DLNA Server 2019 R1
Siveillance Video DLNA Server 2019 R2
Siveillance Video DLNA Server 2019 R3
Siveillance Video DLNA Server 2020 R1
Siveillance Video DLNA Server 2020 R2
Siveillance Video DLNA Server 2020 R3
Siveillance Video DLNA Server 2021 R1

Exploitation Mechanism

The vulnerability allows attackers to bypass restrictions and access files outside the intended directories, compromising data integrity.

Mitigation and Prevention

Immediate action is crucial to mitigate the risks associated with CVE-2021-42021.

Immediate Steps to Take

Apply security patches or updates provided by Siemens promptly.
Implement network segmentation to restrict unauthorized access to critical servers.
Monitor server logs for any suspicious activities or unauthorized access attempts.

Long-Term Security Practices

Conduct regular security assessments and penetration testing to identify vulnerabilities proactively.
Train employees on cybersecurity best practices to prevent unauthorized access attempts.

Patching and Updates

Siemens may release patches or updates to address this vulnerability; ensure timely installation to safeguard your systems.