CVE-2021-25919 : Exploit Details and Defense Strategies

OpenEMR versions 5.0.2 to 6.0.0 are vulnerable to Stored Cross-Site-Scripting (XSS) attacks due to improper user input validation. This could allow a highly privileged attacker to inject malicious code into input fields.

Understanding CVE-2021-25919

This CVE identifies a critical vulnerability in OpenEMR versions 5.0.2 to 6.0.0 that could be exploited by a highly privileged attacker to execute arbitrary code through a Stored Cross-Site-Scripting (XSS) attack.

What is CVE-2021-25919?

CVE-2021-25919 pertains to a security issue in OpenEMR where versions 5.0.2 to 6.0.0 are susceptible to Stored Cross-Site-Scripting (XSS) due to inadequate input validation. An attacker with high privileges could inject and execute malicious scripts via input fields.

The Impact of CVE-2021-25919

If successfully exploited, this vulnerability could lead to unauthorized execution of malicious scripts, compromise sensitive data, and potentially result in a complete system takeover, posing a significant threat to the security and integrity of the OpenEMR software.

Technical Details of CVE-2021-25919

This section outlines specific technical aspects of the CVE.

Vulnerability Description

The vulnerability in OpenEMR versions 5.0.2 to 6.0.0 is due to stored cross-site scripting (XSS) resulting from inadequate validation of user inputs. Attackers with high privileges can inject arbitrary code into input fields, potentially leading to unauthorized script execution.

Affected Systems and Versions

OpenEMR versions 5.0.2 to 6.0.0 are confirmed to be affected by this CVE.

Exploitation Mechanism

Attackers exploit this vulnerability by injecting malicious code into input fields while creating a new user in the OpenEMR system, potentially allowing them to execute unauthorized scripts.

Mitigation and Prevention

To address CVE-2021-25919 and enhance security, consider implementing the following measures:

Immediate Steps to Take

Update OpenEMR to a non-vulnerable version or apply patches provided by the vendor.
Regularly monitor user inputs and apply strict validation techniques to prevent XSS attacks.

Long-Term Security Practices

Conduct regular security assessments and audits to identify and mitigate vulnerabilities promptly.
Educate users and administrators on best practices for secure coding and input validation.

Patching and Updates

Stay informed about security updates and patches released by OpenEMR. Promptly install updates to ensure that known vulnerabilities are addressed efficiently.