CVE-2019-15623 : Security Advisory and Response
Learn about CVE-2019-15623 where Nextcloud Server 16.0.1 unintentionally exposes private information, sending domain and user IDs to the Lookup Server, impacting privacy. Find mitigation steps and preventive measures.
Nextcloud Server 16.0.1 exposes private information, sending domain and user IDs to the Nextcloud Lookup Server unintentionally.
Understanding CVE-2019-15623
When the Nextcloud Server 16.0.1 exposes private information, it unintentionally sends domain and user IDs to the Nextcloud Lookup Server, even when the Lookup server is disabled.
What is CVE-2019-15623?
This CVE refers to the exposure of private information in Nextcloud Server 16.0.1, causing the server to send its domain and user IDs to the Nextcloud Lookup Server without any further data when the Lookup server is disabled.
The Impact of CVE-2019-15623
The vulnerability leads to a privacy violation (CWE-359) by disclosing sensitive information to the Lookup Server.
Technical Details of CVE-2019-15623
Nextcloud Server 16.0.1 vulnerability details:
Vulnerability Description
- Nextcloud Server 16.0.1 exposes private information, sending domain and user IDs to the Lookup Server.
Affected Systems and Versions
- Product: Nextcloud Server
- Version: 16.0.1
Exploitation Mechanism
- The server unintentionally sends domain and user IDs to the Lookup Server, even when disabled.
Mitigation and Prevention
Steps to address CVE-2019-15623:
Immediate Steps to Take
- Update Nextcloud Server to a patched version.
- Review and restrict server configurations to prevent data leakage.
Long-Term Security Practices
- Regularly monitor and update server configurations.
- Implement network segmentation to limit data exposure.
Patching and Updates
- Apply security patches provided by Nextcloud promptly to mitigate the vulnerability.