CVE-2018-3762 : Vulnerability Insights and Analysis
Learn about CVE-2018-3762 affecting Nextcloud Server versions prior to 12.0.8 and 13.0.3. Discover the impact, technical details, and mitigation steps for this improper access control vulnerability.
CVE-2018-3762 was published on July 5, 2018, and affects Nextcloud Server versions prior to 12.0.8 and 13.0.3. The vulnerability allows users to request previews for files they should not have access to due to improper verification of dropped permissions for incoming shares.
Understanding CVE-2018-3762
This CVE involves an improper access control issue in Nextcloud Server versions.
What is CVE-2018-3762?
The vulnerability in Nextcloud Server versions before 12.0.8 and 13.0.3 allows users to bypass proper permissions and access file previews they are not authorized to view.
The Impact of CVE-2018-3762
The vulnerability could lead to unauthorized access to sensitive files and compromise data confidentiality within affected Nextcloud Server instances.
Technical Details of CVE-2018-3762
This section provides more technical insights into the CVE.
Vulnerability Description
Nextcloud Server versions prior to 12.0.8 and 13.0.3 lack proper checks on dropped permissions for incoming shares, enabling users to request previews for restricted files.
Affected Systems and Versions
- Product: Nextcloud Server
- Vendor: Nextcloud
- Vulnerable Versions: <13.0.3, <12.0.8
Exploitation Mechanism
The vulnerability arises from the failure to adequately verify permissions for incoming shares, allowing users to exploit this flaw and access unauthorized file previews.
Mitigation and Prevention
Protecting systems from CVE-2018-3762 requires immediate actions and long-term security measures.
Immediate Steps to Take
- Upgrade Nextcloud Server to version 12.0.8 or 13.0.3 to mitigate the vulnerability.
- Monitor and restrict user permissions to prevent unauthorized access to sensitive files.
Long-Term Security Practices
- Regularly update and patch Nextcloud Server to address security vulnerabilities promptly.
- Conduct security audits and assessments to identify and remediate access control issues.
Patching and Updates
Apply security patches and updates provided by Nextcloud to ensure the ongoing security of the server.