CVE-2020-8119 : Exploit Details and Defense Strategies

Nextcloud Server 17.0.0 is affected by an improper authorization vulnerability that leads to the leaking of previews and files when a file-drop share link is opened via the gallery app.

Understanding CVE-2020-8119

This CVE identifies a security issue in Nextcloud Server version 17.0.0.

What is CVE-2020-8119?

The vulnerability in Nextcloud Server 17.0.0 allows unauthorized access to previews and files through a file-drop share link in the gallery app.

The Impact of CVE-2020-8119

The vulnerability can result in unauthorized access to sensitive information, potentially compromising the confidentiality of shared files.

Technical Details of CVE-2020-8119

Nextcloud Server 17.0.0 is susceptible to unauthorized data access due to improper authorization.

Vulnerability Description

The issue arises from a lack of proper authorization controls, enabling the leakage of previews and files when accessing a file-drop share link via the gallery app.

Affected Systems and Versions

Product: Nextcloud Server
Version: 17.0.0

Exploitation Mechanism

Unauthorized users can exploit the vulnerability by opening a file-drop share link through the gallery app, leading to the exposure of previews and files.

Mitigation and Prevention

To address CVE-2020-8119, immediate actions and long-term security practices are recommended.

Immediate Steps to Take

Update Nextcloud Server to a patched version that addresses the improper authorization vulnerability.
Restrict access to sensitive files and directories within the Nextcloud environment.

Long-Term Security Practices

Regularly monitor and audit access controls and permissions within Nextcloud Server.
Educate users on secure file sharing practices to prevent unauthorized data exposure.

Patching and Updates

Apply security patches provided by Nextcloud to fix the improper authorization issue and enhance overall system security.