CVE-2017-0936 Explained : Impact and Mitigation

CVE-2017-0936 was published on February 7, 2018, and affects Nextcloud Server versions prior to 11.0.7 and 12.0.5. The vulnerability allows logged-in users to bypass authorization and modify app passwords of other users.

Understanding CVE-2017-0936

What is CVE-2017-0936?

CVE-2017-0936 is an Authorization Bypass Through User-Controlled Key vulnerability in Nextcloud Server versions before 11.0.7 and 12.0.5. It enables users to alter the scope of app passwords belonging to other users.

The Impact of CVE-2017-0936

The vulnerability does not expose actual app passwords and cannot be exploited to impersonate other users.

Technical Details of CVE-2017-0936

Vulnerability Description

A missing ownership check in Nextcloud Server allowed authenticated users to manipulate app passwords of other users.

Affected Systems and Versions

Product: Nextcloud Server
Vendor: Nextcloud
Versions Affected: Before 11.0.7 and 12.0.5

Exploitation Mechanism

The vulnerability enables unauthorized users to modify the scope of app passwords of other users without proper authorization.

Mitigation and Prevention

Immediate Steps to Take

Upgrade Nextcloud Server to version 11.0.7 or 12.0.5 to mitigate the vulnerability.
Monitor app password changes for any unauthorized modifications.

Long-Term Security Practices

Regularly update and patch Nextcloud Server to address security vulnerabilities.
Implement strong authentication mechanisms to prevent unauthorized access.

Patching and Updates

Apply security patches and updates provided by Nextcloud to ensure the ongoing security of the server.