CVE-2021-21936 Explained : Impact and Mitigation

A CVE-2021-21936 vulnerability has been identified in Advantech's R-SeeNet software version 2.4.15. This vulnerability can be exploited through a specially-crafted HTTP request leading to SQL injection.

Understanding CVE-2021-21936

This section will cover what CVE-2021-21936 is and the impact it can have.

What is CVE-2021-21936?

The CVE-2021-21936 vulnerability is triggered by a malicious HTTP request that allows an attacker to execute SQL injection. By manipulating the 'health_alt_filter' parameter, an authenticated user or a cross-site request forgery attacker can exploit this flaw.

The Impact of CVE-2021-21936

With a CVSSv3 base score of 7.7, this vulnerability has a high severity rating. It can result in high confidentiality impact by allowing unauthorized access to sensitive data.

Technical Details of CVE-2021-21936

Let's delve deeper into the technical aspects of this vulnerability.

Vulnerability Description

The vulnerability arises from improper input validation of the 'health_alt_filter' parameter, enabling SQL injection attacks.

Affected Systems and Versions

Advantech's R-SeeNet version 2.4.15 released on 30th July 2021 is affected by this vulnerability.

Exploitation Mechanism

Exploitation of this vulnerability can be carried out by crafting a specific HTTP request that manipulates the 'health_alt_filter' parameter.

Mitigation and Prevention

Discover the necessary steps to mitigate and prevent exploitation of CVE-2021-21936.

Immediate Steps to Take

Immediately restrict access to vulnerable systems and monitor for any malicious activity targeting this vulnerability.

Long-Term Security Practices

Implement strict input validation mechanisms and security controls to prevent SQL injection attacks in the future.

Patching and Updates

Update the Advantech R-SeeNet software to a patched version that addresses this vulnerability to ensure system security.