CVE-2021-29440 : What You Need to Know

Twig, a vulnerability in the Grav content management system, allows arbitrary code execution and privilege escalation due to unsandboxed Twig processing. This CVE has a CVSS base score of 8.4, indicating a high severity issue.

Understanding CVE-2021-29440

This section dives into the details of the Twig vulnerability in Grav.

What is CVE-2021-29440?

CVE-2021-29440 highlights a security flaw in Grav, where Twig processing of static pages can be enabled, leading to arbitrary code execution and privilege elevation.

The Impact of CVE-2021-29440

The CVE carries a CVSS base score of 8.4, indicating a high severity vulnerability with significant impacts on confidentiality, integrity, and availability.

Technical Details of CVE-2021-29440

Let's explore the technical aspects of this CVE.

Vulnerability Description

The vulnerability arises from unsandboxed Twig processing, allowing administrative users to execute dangerous PHP functions.

Affected Systems and Versions

Grav versions prior to 1.7.11 are affected by this vulnerability, enabling attackers to exploit Twig processing for arbitrary code execution.

Exploitation Mechanism

By leveraging the Twig processor in Grav, malicious users can execute arbitrary code and gain elevated privileges on the system.

Mitigation and Prevention

Discover how to protect your systems from the Twig vulnerability.

Immediate Steps to Take

Users are advised to update Grav to version 1.7.11 or later to mitigate the Twig vulnerability and prevent code execution risks.

Long-Term Security Practices

Implement strong security protocols, restrict administrative access, and regularly monitor for unauthorized activities to enhance system security.

Patching and Updates

Stay informed about security patches and updates for Grav to address vulnerabilities promptly and maintain a secure web platform.