CVE-2019-11813 : Security Advisory and Response

A vulnerability was identified in MISP version 2.4.107 that allows for persistent cross-site scripting (XSS) attacks.

Understanding CVE-2019-11813

This CVE involves a specific vulnerability in MISP version 2.4.107 that can be exploited by attackers to execute XSS attacks.

What is CVE-2019-11813?

This CVE refers to a flaw in the file app/View/Elements/Events/View/value_field.ctp in MISP version 2.4.107. Attackers can leverage this vulnerability through link type attributes containing javascript:// links, leading to persistent cross-site scripting (XSS) attacks.

The Impact of CVE-2019-11813

The vulnerability allows attackers to inject malicious scripts into web pages viewed by other users, potentially leading to unauthorized access to sensitive data or account takeover.

Technical Details of CVE-2019-11813

This section provides more technical insights into the CVE.

Vulnerability Description

The issue resides in app/View/Elements/Events/View/value_field.ctp in MISP before version 2.4.107, enabling persistent XSS attacks via link type attributes with javascript:// links.

Affected Systems and Versions

Affected Version: MISP version 2.4.107
Systems: MISP instances running versions prior to 2.4.107

Exploitation Mechanism

Attackers can exploit this vulnerability by inserting malicious scripts into link type attributes that contain javascript:// links, allowing them to execute XSS attacks.

Mitigation and Prevention

Protecting systems from CVE-2019-11813 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update MISP to version 2.4.107 or later to mitigate the vulnerability.
Regularly monitor and sanitize user inputs to prevent XSS attacks.

Long-Term Security Practices

Implement input validation and output encoding to prevent XSS vulnerabilities.
Educate users on safe browsing habits and the risks of clicking on suspicious links.

Patching and Updates

Stay informed about security updates and patches released by MISP.
Apply patches promptly to ensure systems are protected against known vulnerabilities.