CVE-2021-43861 Explained : Impact and Mitigation
Learn about CVE-2021-43861 affecting Mermaid diagramming tool prior to version 8.13.8, allowing malicious JavaScript execution. Upgrade to patch XSS vulnerability.
Mermaid is a Javascript based diagramming and charting tool that uses Markdown-inspired text definitions and a renderer to create and modify complex diagrams. Prior to version 8.13.8, malicious diagrams can run JavaScript code at diagram readers' machines. Users are advised to upgrade to version 8.13.8 to receive a patch.
Understanding CVE-2021-43861
Mermaid tool prior to version 8.13.8 is susceptible to attacks due to improper sanitization that leads to cross-site scripting (XSS) vulnerabilities.
What is CVE-2021-43861?
CVE-2021-43861 highlights a security issue in Mermaid versions earlier than 8.13.8, allowing malicious diagrams to execute JavaScript on the machines of users viewing the diagrams.
The Impact of CVE-2021-43861
The vulnerability has a high severity rating with a base score of 7.2 according to the CVSS v3.1 metrics. It can lead to high impacts on confidentiality, integrity, and availability of affected systems.
Technical Details of CVE-2021-43861
The technical details of this CVE provide insights into the vulnerability and its exploitation.
Vulnerability Description
The vulnerability arises from improper sanitization functions in the Mermaid tool, enabling attackers to inject and run malicious JavaScript code.
Affected Systems and Versions
- Product: Mermaid
- Vendor: Mermaid-js
- Versions Affected: < 8.13.8
Exploitation Mechanism
The vulnerability allows threat actors to craft malicious diagrams that, when accessed by users, execute JavaScript code on the target machines.
Mitigation and Prevention
Addressing and preventing the exploitation of CVE-2021-43861 is crucial for maintaining system security.
Immediate Steps to Take
- Upgrade Mermaid to version 8.13.8 or later to mitigate the XSS vulnerability.
Long-Term Security Practices
- Regularly update software and applications to the latest versions to ensure security patches are applied promptly.
Patching and Updates
- Stay informed about security advisories and release notes to promptly address vulnerabilities and ensure secure usage.