Improper permissions preservation in Nextcloud Server 16.0.1 causes sharees to be able to reshare with write permissions when sharing the mount point of a share they received, as a public link.
Weakness
The product does not preserve permissions or incorrectly preserves permissions when copying, restoring, or sharing objects, which can cause them to have less restrictive permissions than intended.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Nextcloud_server | Nextcloud | * | 14.0.13 (excluding) |
| Nextcloud_server | Nextcloud | 15.0.0 (including) | 15.0.9 (excluding) |
| Nextcloud_server | Nextcloud | 16.0.0 (including) | 16.0.2 (excluding) |
References
- http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00019.html
- http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00022.html
- https://hackerone.com/reports/619484
- https://nextcloud.com/security/advisory/?id=NC-SA-2020-012
- http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00019.html
- http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00022.html
- https://hackerone.com/reports/619484
- https://nextcloud.com/security/advisory/?id=NC-SA-2020-012