CVE-2021-25918 : Security Advisory and Response
Learn about CVE-2021-25918 affecting OpenEMR versions 5.0.2 to 6.0.0. Explore the impact, technical details, and mitigation steps for this Cross-Site-Scripting vulnerability.
OpenEMR versions 5.0.2 to 6.0.0 are vulnerable to Stored Cross-Site-Scripting (XSS) due to improper user input validation in the TOTP Authentication method. An attacker with high privileges could insert malicious code into input fields during new user creation.
Understanding CVE-2021-25918
This section provides insights into the impact and technical details of the vulnerability.
What is CVE-2021-25918?
CVE-2021-25918 pertains to Stored Cross-Site-Scripting (XSS) vulnerability in OpenEMR versions 5.0.2 to 6.0.0, allowing attackers to inject arbitrary code into input fields.
The Impact of CVE-2021-25918
The vulnerability exposes OpenEMR to potential attacks by highly privileged adversaries, enabling them to execute malicious scripts in the application context.
Technical Details of CVE-2021-25918
This section delves into the specifics of the vulnerability.
Vulnerability Description
The vulnerability arises due to inadequate validation of user input, leading to the injection of malicious scripts in the TOTP Authentication method page within OpenEMR.
Affected Systems and Versions
OpenEMR versions 5.0.2, 5.0.2.1, 5.0.2.2, 5.0.2.3, 5.0.2.4, and 6.0.0 are impacted by this XSS vulnerability.
Exploitation Mechanism
Attackers with significant privileges can exploit this vulnerability by inserting arbitrary code into input fields when creating a new user.
Mitigation and Prevention
In this section, we outline strategies to mitigate and prevent exploitation of CVE-2021-25918.
Immediate Steps to Take
Users must update OpenEMR to the latest patched version to prevent exploitation of this vulnerability. Additionally, restrict privileged access to prevent unauthorized users from exploiting the XSS flaw.
Long-Term Security Practices
Implement a robust input validation mechanism to thwart XSS attacks and regularly educate users on safe coding practices to enhance overall system security.
Patching and Updates
Regularly monitor security advisories and apply patches promptly to ensure OpenEMR remains resilient against emerging threats.