CVE-2021-43264 : Exploit Details and Defense Strategies

In Mahara before 20.04.5, 20.10.3, 21.04.2, and 21.10.0 versions, attackers can exploit a vulnerability to bypass access control for HTML files via directory traversal.

Understanding CVE-2021-43264

This CVE highlights a security issue in Mahara versions prior to 20.04.5, 20.10.3, 21.04.2, and 21.10.0.

What is CVE-2021-43264?

This CVE allows attackers to manipulate path components in the page help file to circumvent intended access controls for HTML files through directory traversal.

The Impact of CVE-2021-43264

The vulnerability enables attackers to replace the - character with /, effectively bypassing access restrictions and potentially gaining unauthorized access to HTML files.

Technical Details of CVE-2021-43264

This section delves into the technical aspects of the CVE.

Vulnerability Description

By altering the path component in the page help file, attackers can evade access controls for HTML files via directory traversal, switching - to /.

Affected Systems and Versions

Affected Systems: Mahara versions before 20.04.5, 20.10.3, 21.04.2, and 21.10.0.
Specific Versions: 20.04.5, 20.10.3, 21.04.2, and 21.10.0.

Exploitation Mechanism

Attackers exploit the vulnerability by making path adjustments in the help file, subverting access controls by changing - to / characters.

Mitigation and Prevention

Learn how to mitigate and prevent exploits of CVE-2021-43264.

Immediate Steps to Take

Update Mahara to versions 20.04.5, 20.10.3, 21.04.2, or 21.10.0 to patch the vulnerability.
Implement access controls and input validation to prevent directory traversal attacks.

Long-Term Security Practices

Conduct regular security assessments to identify and address vulnerabilities.
Educate users on secure coding practices and the risks of directory traversal attacks.

Patching and Updates

Regularly update Mahara to the latest versions to ensure security patches are applied effectively.