CVE-2021-32630 : What You Need to Know

Admidio is an open-source user management system for websites. In Admidio versions prior to 4.0.4, a critical vulnerability exists allowing for authenticated remote code execution (RCE) via .phar file upload, potentially leading to a reverse/bind shell payload. The issue has been addressed in version 4.0.4.

Understanding CVE-2021-32630

This CVE pertains to an authenticated RCE vulnerability in Admidio before version 4.0.4, which could be exploited through a malicious .phar file upload.

What is CVE-2021-32630?

Admidio, a free open-source user management system, is susceptible to an authenticated RCE via .phar file upload in versions earlier than 4.0.4.

The Impact of CVE-2021-32630

The vulnerability could allow an attacker to upload a PHP web shell through the Documents & Files upload feature, potentially leading to a reverse/bind shell payload.

Technical Details of CVE-2021-32630

In Admidio versions prior to 4.0.4, the vulnerability arises from an unrestricted upload of a file with a dangerous type, enabling the upload and execution of a malicious .phar file.

Vulnerability Description

The flaw permits an attacker with upload permissions to upload a PHP shell, rename it with a .phar extension, and trigger the payload for remote code execution.

Affected Systems and Versions

Admidio versions before 4.0.4 are affected by this vulnerability.

Exploitation Mechanism

By exploiting the authenticated RCE vulnerability via a .phar file upload, an attacker could execute arbitrary code on the target system.

Mitigation and Prevention

To mitigate the risk associated with CVE-2021-32630, users should take immediate steps and adopt long-term security practices to enhance system security.

Immediate Steps to Take

Exclude the .phar file extension from being uploaded and conduct a security audit to ensure no malicious files are present.

Long-Term Security Practices

Implement strict file upload restrictions, educate users on secure practices, and keep software up to date to prevent security loopholes.

Patching and Updates

It is crucial to update Admidio to version 4.0.4 or later to patch the authenticated RCE vulnerability.