CVE-2021-21911 Explained : Impact and Mitigation
Learn about CVE-2021-21911, a privilege escalation vulnerability affecting Advantech R-SeeNet 2.4.15 on Windows. Understand the impact, technical details, and mitigation steps for CVE-2021-21911.
A privilege escalation vulnerability has been identified in the Windows installation version of Advantech R-SeeNet 2.4.15. This vulnerability allows an attacker to replace a specially-crafted file on the system, leading to escalated privileges to NT SYSTEM authority.
Understanding CVE-2021-21911
This section delves into the details of the CVE-2021-21911 vulnerability.
What is CVE-2021-21911?
CVE-2021-21911 is a privilege escalation vulnerability affecting the Windows version of installation for Advantech R-SeeNet 2.4.15. An attacker can exploit this by replacing a malicious file in the system to gain elevated privileges.
The Impact of CVE-2021-21911
The impact of this vulnerability is rated as high, with a base score of 8.8 (High) according to the CVSS v3.0 metrics. It can result in significant confidentiality, integrity, and availability impacts on the affected systems.
Technical Details of CVE-2021-21911
In this section, we explore the technical aspects of CVE-2021-21911.
Vulnerability Description
The vulnerability arises from incorrect default permissions in the Advantech R-SeeNet 2.4.15 installation for Windows, enabling unauthorized users to escalate privileges.
Affected Systems and Versions
Advantech R-SeeNet 2.4.15 (30.07.2021) for Windows is specifically impacted by this vulnerability.
Exploitation Mechanism
By providing a specially-crafted file, an attacker can trigger the privilege escalation vulnerability in Advantech R-SeeNet, granting unauthorized access.
Mitigation and Prevention
This section covers the recommended steps to mitigate and prevent exploitation of CVE-2021-21911.
Immediate Steps to Take
Immediately apply vendor-supplied patches or updates to remediate the vulnerability. Restrict access to vulnerable systems and monitor for any suspicious activity.
Long-Term Security Practices
Implement the principle of least privilege, regularly update security configurations, and conduct security awareness training to enhance overall system security.
Patching and Updates
Stay informed about security advisories from Advantech and apply patches promptly to address known vulnerabilities.