CVE-2022-41970 : What You Need to Know

Nextcloud Server's disabled download shares still allow download through preview images.

Understanding CVE-2022-41970

This vulnerability in Nextcloud Server allows unauthorized downloads through preview images, affecting versions prior to 24.0.7 and 25.0.1.

What is CVE-2022-41970?

The Nextcloud Server, an open-source personal cloud server, is impacted by improper access control. Despite download shares being disabled, attackers can still download files through preview images.

The Impact of CVE-2022-41970

This vulnerability poses a low severity risk, with a CVSS base score of 2.6. Attackers with low privileges can exploit this issue, requiring user interaction. Confidentiality impact is low, and integrity impact is none.

Technical Details of CVE-2022-41970

This section provides details about the vulnerability and its implications.

Vulnerability Description

Disabled download shares in Nextcloud Server allow downloads via preview images, enabling access to files and document previews without watermarks.

Affected Systems and Versions

Vendor: Nextcloud
Product: Security Advisories
Affected Versions:
< 24.0.7

= 25.0.0, < 25.0.1

Exploitation Mechanism

Attackers can exploit this vulnerability by using preview images to download files that should be restricted, compromising data confidentiality.

Mitigation and Prevention

Protecting systems from CVE-2022-41970 requires immediate action and long-term security measures.

Immediate Steps to Take

Update Nextcloud Server to versions 24.0.7 or 25.0.1 to mitigate the risk of unauthorized downloads through preview images.

Long-Term Security Practices

Regularly update and patch Nextcloud Server to address security vulnerabilities and protect against potential exploits.

Patching and Updates

Apply security patches promptly to ensure that known vulnerabilities are addressed effectively.