CVE-2021-22896 Explained : Impact and Mitigation

Nextcloud Mail before version 1.9.5 is impacted by a vulnerability that allows authenticated users to create mail aliases for other users due to improper access control and missing permission checks.

Understanding CVE-2021-22896

This CVE ID refers to a security issue found in Nextcloud Mail before version 1.9.5, leading to a missing permission check that enables authenticated users to create mail aliases for other users.

What is CVE-2021-22896?

CVE-2021-22896 is a vulnerability in Nextcloud Mail that results from improper access control, allowing unauthorized creation of mail aliases by authenticated users.

The Impact of CVE-2021-22896

The impact of this vulnerability is significant as it enables users to manipulate mail aliases of other users, potentially leading to unauthorized access or information disclosure.

Technical Details of CVE-2021-22896

The technical details of CVE-2021-22896 include the vulnerability description, affected systems and versions, and the exploitation mechanism.

Vulnerability Description

Nextcloud Mail before version 1.9.5 suffers from improper access control due to a missing permission check allowing other authenticated users to create mail aliases for other users.

Affected Systems and Versions

The vulnerability affects Nextcloud Mail versions before 1.9.5.

Exploitation Mechanism

Authenticated users can exploit this vulnerability to create mail aliases for other users without proper authorization.

Mitigation and Prevention

To address CVE-2021-22896, immediate steps should be taken along with long-term security practices and patching.

Immediate Steps to Take

Upgrade Nextcloud Mail to version 1.9.5 to mitigate the vulnerability.
Restrict user permissions to prevent unauthorized access.

Long-Term Security Practices

Implement regular security audits and train users on secure practices to avoid similar vulnerabilities.

Patching and Updates

Regularly monitor security advisories and apply patches promptly to stay protected.