CVE-2021-39224 : Exploit Details and Defense Strategies

Nextcloud OfficeOnline application prior to version 1.1.1 is affected by a vulnerability that could lead to a full path disclosure on shared files.

Understanding CVE-2021-39224

This CVE refers to the file path disclosure issue in the OfficeOnline application of Nextcloud, potentially exposing sensitive information.

What is CVE-2021-39224?

The vulnerability in Nextcloud's OfficeOnline application could allow an attacker to view the full path of shared files, exposing potentially sensitive information.

The Impact of CVE-2021-39224

The impact of this vulnerability is rated as Low severity with a CVSS base score of 3.5. It requires network access and user interaction to exploit, leading to the disclosure of sensitive data.

Technical Details of CVE-2021-39224

Nextcloud OfficeOnline application version < 1.1.1 is susceptible to a full path disclosure vulnerability in shared files.

Vulnerability Description

The vulnerable version of the OfficeOnline application returns verbatim exception messages to users, potentially revealing complete file paths of shared files.

Affected Systems and Versions

Product: security-advisories
Vendor: nextcloud
Versions Affected: < 1.1.1

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Network
User Interaction: Required
Privileges Required: Low
Confidentiality Impact: Low

Mitigation and Prevention

To address CVE-2021-39224, consider the following steps:

Immediate Steps to Take

Upgrade the OfficeOnline application to version 1.1.1
Disable the OfficeOnline application in the app settings as a workaround

Long-Term Security Practices

Regularly update software and applications
Implement access controls and restrictions to limit exposure

Patching and Updates

Ensure all systems are patched with the latest updates and security fixes to prevent exploitation of this vulnerability.