CVE-2020-13673 : Security Advisory and Response

The Entity Embed module in Drupal allows unprivileged users to inject HTML, potentially leading to cross-site scripting.

Understanding CVE-2020-13673

The Entity Embed module in Drupal is vulnerable to cross-site scripting due to improper filtering of embedded entities.

What is CVE-2020-13673?

The Entity Embed module in Drupal allows unprivileged users to inject HTML into pages, posing a risk of cross-site scripting when accessed by trusted users.

The Impact of CVE-2020-13673

This vulnerability could be exploited by attackers to execute malicious scripts on the victim's browser, potentially leading to unauthorized actions or data theft.

Technical Details of CVE-2020-13673

The vulnerability in the Entity Embed module in Drupal exposes systems to cross-site scripting attacks.

Vulnerability Description

The Entity Embed module lacks proper filtering, enabling unprivileged users to inject HTML, which trusted users may unknowingly execute, leading to cross-site scripting.

Affected Systems and Versions

Product: Entity Embed
Vendor: Drupal
Versions Affected: < 8.x-1.2

Exploitation Mechanism

Attackers can exploit this vulnerability by injecting malicious HTML code through the Entity Embed module, potentially executing scripts on trusted users' browsers.

Mitigation and Prevention

To address CVE-2020-13673, immediate actions and long-term security practices are crucial.

Immediate Steps to Take

Update the Entity Embed module to a non-vulnerable version.
Implement strict input validation to prevent HTML injection.
Monitor and restrict user permissions for embedding entities.

Long-Term Security Practices

Regularly audit and review code for vulnerabilities.
Educate users on safe content embedding practices.

Patching and Updates

Apply security patches provided by Drupal promptly to mitigate the vulnerability.