CVE-2021-34639 : Exploit Details and Defense Strategies

WordPress Download Manager version 3.1.24 and previous versions are affected by an Authenticated Arbitrary File Upload vulnerability that allows Author+ users to upload files with executable double extensions. This can lead to high impact on confidentiality, integrity, and availability of the affected systems.

Understanding CVE-2021-34639

This CVE involves an authenticated file upload vulnerability in WordPress Download Manager <= 3.1.24 that can allow users to upload malicious files with executable double extensions.

What is CVE-2021-34639?

CVE-2021-34639 refers to an Authenticated Arbitrary File Upload vulnerability in WordPress Download Manager version 3.1.24 and earlier. It enables authenticated users to upload files with double extensions, leading to potential execution of malicious code.

The Impact of CVE-2021-34639

This vulnerability has a high severity impact, affecting the confidentiality, integrity, and availability of systems where WordPress Download Manager <= 3.1.24 is installed. Attackers can exploit this flaw to upload and execute malicious files.

Technical Details of CVE-2021-34639

The technical details of the CVE include vulnerability description, affected systems and versions, and exploitation mechanism.

Vulnerability Description

The vulnerability allows authenticated users to upload files with double extensions that may execute in specific configurations, posing a risk to the affected systems.

Affected Systems and Versions

WordPress Download Manager version 3.1.24 and prior versions are affected. Users with Author+ privileges are capable of exploiting this vulnerability.

Exploitation Mechanism

Attackers with Author+ access can upload files with double extensions, such as "payload.php.png", which can be executed in certain scenarios.

Mitigation and Prevention

To mitigate and prevent exploitation of CVE-2021-34639, immediate steps and long-term security practices are recommended.

Immediate Steps to Take

Users should update WordPress Download Manager to a patched version and monitor file uploads for suspicious double extensions.

Long-Term Security Practices

Implement proper file upload validation, restrict permissions based on the principle of least privilege, and regularly update software components to prevent such vulnerabilities.

Patching and Updates

Stay informed about security updates for WordPress Download Manager and promptly apply patches provided by the vendor to address known vulnerabilities.