CVE-2021-32688

Nextcloud Server is a Nextcloud package that handles data storage. Nextcloud Server supports application specific tokens for authentication purposes. These tokens are supposed to be granted to a specific applications (e.g. DAV sync clients), and can also be configured by the user to not have any filesystem access. Due to a lacking permission check, the tokens were able to change their own permissions in versions prior to 19.0.13, 20.0.11, and 21.0.3. Thus fileystem limited tokens were able to grant themselves access to the filesystem. The issue is patched in versions 19.0.13, 20.0.11, and 21.0.3. There are no known workarounds aside from upgrading.

Nextcloud Server is a Nextcloud package that handles data storage. Nextcloud Server supports application specific tokens for authentication purposes. These tokens are supposed to be granted to a specific applications (e.g. DAV sync clients), and can also be configured by the user to not have any filesystem access. Due to a lacking permission check, the tokens were able to change their own permissions in versions prior to 19.0.13, 20.0.11, and 21.0.3. Thus fileystem limited tokens were able to grant themselves access to the filesystem. The issue is patched in versions 19.0.13, 20.0.11, and 21.0.3. There are no known workarounds aside from upgrading.

Nextcloud Server es un paquete de Nextcloud que maneja el almacenamiento de datos. Nextcloud Server soporta tokens específicos de la aplicación para fines de autenticación. Estos tokens se supone que le conceden a una aplicación específica (por ejemplo, clientes de sincronización DAV), y también pueden ser configurados por el usuario para no tener ningún acceso al sistema de archivos. Debido a una falta de comprobación de permisos, los tokens podían cambiar sus propios permisos en versiones anteriores a 19.0.13, 20.0.11 y 21.0.3. Así, los tokens limitados al sistema de archivos podían concederse a sí mismos acceso al sistema de archivos. El problema está parcheado En versiones 19.0.13, 20.0.11 y 21.0.3. No se conocen soluciones aparte de la actualización