CVE-2021-32725

Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.13, 20.011, and 21.0.3, default share permissions were not being respected for federated reshares of files and folders. The issue was fixed in versions 19.0.13, 20.0.11, and 21.0.3. There are no known workarounds.

Weakness

A product defines a set of insecure permissions that are inherited by objects that are created by the program.

Affected Software

Potential Mitigations

• Compartmentalize the system to have “safe” areas where trust boundaries can be unambiguously drawn. Do not allow sensitive data to go outside of the trust boundary and always be careful when interfacing with a compartment outside of the safe area.
• Ensure that appropriate compartmentalization is built into the system design, and the compartmentalization allows for and reinforces privilege separation functionality. Architects and designers should rely on the principle of least privilege to decide the appropriate time to use privileges and the time to drop privileges.

References

• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-6f6v-h9x9-jj4v
• https://github.com/nextcloud/server/pull/26946
• https://hackerone.com/reports/1178320
• https://security.gentoo.org/glsa/202208-17