CVE-2021-39223 : Security Advisory and Response
Learn about CVE-2021-39223, a vulnerability in Nextcloud Richdocuments application that could expose sensitive information through file path disclosure. Find mitigation steps and the impact of the vulnerability.
Nextcloud Richdocuments application versions prior to 3.8.6 and 4.2.3 could disclose full file paths, potentially exposing sensitive information.
Understanding CVE-2021-39223
The vulnerability in the Richdocuments application of Nextcloud could allow attackers to see the exact file paths on shared files, leading to potential data exposure.
What is CVE-2021-39223?
CVE-2021-39223 is a vulnerability in Nextcloud's Richdocuments application that could reveal complete file paths of shared files, risking the exposure of sensitive data to unauthorized parties.
The Impact of CVE-2021-39223
The vulnerability has a CVSS base score of 4.8, with high confidentiality impact but no integrity impact. It requires low privileges and user interaction, with a high attack complexity over the network.
Technical Details of CVE-2021-39223
The following technical details outline the specifics of this vulnerability in the Richdocuments application:
Vulnerability Description
- Richdocuments application versions prior to 3.8.6 and 4.2.3 disclosed verbatim exception messages to users, enabling full path disclosure on shared files.
Affected Systems and Versions
- Affected product: security-advisories
- Vendor: Nextcloud
- Vulnerable versions:
- < 3.8.6,
= 4.0.0, < 4.2.3
Exploitation Mechanism
- Attack Complexity: High
- Attack Vector: Network
- Privileges Required: Low
- User Interaction: Required
Mitigation and Prevention
Taking immediate steps and implementing long-term security practices are essential to mitigate the risks associated with CVE-2021-39223.
Immediate Steps to Take
- Upgrade the Richdocuments application to versions 3.8.6 or 4.2.3.
- As a workaround, disable the Richdocuments application in the app settings.
Long-Term Security Practices
- Regularly update and patch the Richdocuments application.
- Monitor and restrict access to sensitive files and directories.
- Conduct security awareness training to educate users on data protection.
- Implement network segmentation to limit the impact of potential breaches.
Patching and Updates
- Ensure that the Richdocuments application is regularly updated to the latest secure version.