CVE-2021-40389 : Exploit Details and Defense Strategies

This CVE-2021-40389 article provides details about a privilege escalation vulnerability in Advantech DeviceOn/iEdge Server 1.0.2.

Understanding CVE-2021-40389

This section will cover the impact, technical details, and mitigation strategies related to CVE-2021-40389.

What is CVE-2021-40389?

CVE-2021-40389 is a privilege escalation vulnerability in Advantech DeviceOn/iEdge Server 1.0.2, allowing an attacker to replace a specially-crafted file to escalate privileges to NT SYSTEM authority.

The Impact of CVE-2021-40389

The CVSS V3.0 base score for this vulnerability is 8.8 (High), with a high impact on confidentiality, integrity, and availability. An attacker with low privileges can exploit it locally without user interaction.

Technical Details of CVE-2021-40389

This section will delve into the vulnerability description, affected systems, versions, and the exploitation mechanism of CVE-2021-40389.

Vulnerability Description

The vulnerability allows privilege escalation by replacing a specially-crafted file in the system, granting NT SYSTEM authority.

Affected Systems and Versions

Product: n/a
Vendor: n/a
Versions affected: 1.0.2

Exploitation Mechanism

By providing a malicious file, an attacker can trigger the vulnerability and escalate privileges to NT SYSTEM authority.

Mitigation and Prevention

Here, you will find immediate steps and long-term security practices to mitigate the CVE-2021-40389 vulnerability.

Immediate Steps to Take

Apply vendor-supplied patches or security updates promptly.
Monitor system files for unauthorized changes.
Restrict access to vulnerable systems.

Long-Term Security Practices

Regularly update and patch software to ensure security.
Conduct security training for users to recognize phishing and suspicious activities.
Implement the principle of least privilege to limit user access.
Utilize security tools like intrusion detection systems.

Patching and Updates

Regularly check for patches and updates from the vendor to address and prevent vulnerabilities like CVE-2021-40389.