CVE-2021-32766 Explained : Impact and Mitigation
Discover the details of CVE-2021-32766, a vulnerability in Nextcloud Text app that could expose folder structures in a "File Drop" link share. Learn about impacted versions, risks, and mitigation steps.
A vulnerability has been identified in the Nextcloud Text app that could potentially disclose the existence of folders in a "File Drop" link share. This CVE-2021-32766 advisory provides details about the affected versions, impact, and mitigation steps.
Understanding CVE-2021-32766
This section delves into the specifics of the CVE-2021-32766 vulnerability found in the Nextcloud Text app.
What is CVE-2021-32766?
Nextcloud Text is a plaintext editing application included with the Nextcloud server. The vulnerability in affected versions allowed attackers to enumerate folders in a publicly shared link with "Upload Only" privileges, potentially disclosing sensitive information.
The Impact of CVE-2021-32766
The CVSS v3.1 base score for this vulnerability is 5.3, categorizing it as a medium severity issue. Attackers could exploit this flaw to view folder structures in "File Drop" shares, compromising user privacy.
Technical Details of CVE-2021-32766
Explore the technical aspects of CVE-2021-32766 to understand the vulnerability in depth.
Vulnerability Description
The vulnerability stemmed from Nextcloud Text returning different error messages based on folder existence in a public link share, enabling unauthorized enumeration of folders in a "File Drop" share.
Affected Systems and Versions
Nextcloud versions lower than 20.0.12, ranging from 21.0.0 to 21.0.3, and 22.0.0 to 22.0.1 are impacted by this vulnerability.
Exploitation Mechanism
Exploitation of this vulnerability requires access to a valid affected "File Drop" link share, allowing attackers to reveal folder structures.
Mitigation and Prevention
Learn the necessary measures to mitigate the risks posed by CVE-2021-32766.
Immediate Steps to Take
It is highly recommended to upgrade the Nextcloud server to versions 20.0.12, 21.0.4, or 22.0.1 to address this vulnerability. Users unable to update should disable the Nextcloud Text application in the app settings.
Long-Term Security Practices
Incorporate regular software updates and security patches as part of your long-term security strategy to prevent similar vulnerabilities.
Patching and Updates
Stay informed about security advisories and promptly apply patches provided by Nextcloud to ensure ongoing protection.