CVE-2021-3924 : Exploit Details and Defense Strategies

grav is vulnerable to Improper Limitation of a Pathname to a Restricted Directory, leading to a Path Traversal vulnerability with a CVSS base score of 8.8.

Understanding CVE-2021-3924

This CVE involves a path traversal vulnerability in getgrav/grav, affecting versions less than or equal to 1.7.24.

What is CVE-2021-3924?

The vulnerability in grav allows attackers to navigate outside the intended directory structure, potentially accessing sensitive files and directories.

The Impact of CVE-2021-3924

With a CVSS base score of 8.8, this high severity vulnerability can lead to unauthorized access, data loss, and system compromise if exploited.

Technical Details of CVE-2021-3924

This section covers the specific technical details of the CVE.

Vulnerability Description

The vulnerability is due to improper limitation of pathname inputs, enabling malicious actors to traverse directories beyond specified boundaries.

Affected Systems and Versions

getgrav/grav versions less than or equal to 1.7.24 are impacted by this vulnerability, exposing them to potential exploitation.

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting malicious requests to traverse directories and access restricted files on the server.

Mitigation and Prevention

Protecting systems from CVE-2021-3924 requires immediate action and ongoing security practices.

Immediate Steps to Take

Update getgrav/grav to a non-vulnerable version above 1.7.24.
Restrict access to sensitive directories and files.

Long-Term Security Practices

Implement input validation mechanisms to prevent directory traversal attacks.
Regularly monitor and audit file system access for any unauthorized activities.

Patching and Updates

Stay informed about security updates for getgrav/grav and apply patches promptly to address known vulnerabilities.