CVE-2021-37743 : Security Advisory and Response

A Stored XSS vulnerability in MISP 2.4.147 allows attackers to execute malicious scripts when viewing galaxy cluster elements in JSON format.

Understanding CVE-2021-37743

This CVE describes a security flaw in MISP version 2.4.147 that enables Stored Cross-Site Scripting (XSS) attacks.

What is CVE-2021-37743?

The vulnerability exists in the 'app/View/GalaxyElements/ajax/index.ctp' file of MISP 2.4.147, allowing threat actors to inject and execute malicious scripts when users view galaxy cluster elements in JSON format.

The Impact of CVE-2021-37743

Successful exploitation of this vulnerability could lead to unauthorized access, data theft, and potential compromise of the MISP platform's integrity.

Technical Details of CVE-2021-37743

This section provides a detailed overview of the vulnerability, its affected systems, versions, and the mechanism of exploitation.

Vulnerability Description

The specific flaw lies in how MISP processes and renders content from the 'app/View/GalaxyElements/ajax/index.ctp' file, allowing attackers to embed malicious scripts that get executed within the context of the user's session.

Affected Systems and Versions

MISP version 2.4.147 is confirmed to be impacted by this vulnerability, exposing instances running this version to the risk of stored XSS attacks.

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting a malicious request to the affected 'index.ctp' file, triggering the execution of unauthorized scripts in the application's context.

Mitigation and Prevention

To safeguard systems from potential exploits leveraging CVE-2021-37743, immediate actions and long-term security measures are crucial.

Immediate Steps to Take

Users are advised to update their MISP installations to a patched version that addresses the stored XSS vulnerability. Additionally, monitoring for any suspicious activities or injected scripts is recommended.

Long-Term Security Practices

Implementing secure coding practices, performing regular security audits, and educating users about the risks associated with XSS attacks are essential for enhancing the overall security posture.

Patching and Updates

Stay informed about security advisories from MISP and promptly apply security patches and updates to ensure that known vulnerabilities, including CVE-2021-37743, are mitigated.