CVE-2021-39226
Snapshot authentication bypass in grafana
In short
Grafana snapshots can be viewed and deleted by anyone without proper authentication. An attacker can access snapshot data and destroy it by guessing simple database keys, leading to data loss and unauthorized information disclosure.
Technical detail
Authentication bypass in Grafana snapshot endpoints allows unauthenticated users to enumerate and view snapshots via /dashboard/snapshot/:key or /api/snapshots/:key, and delete snapshots via /api/snapshots-delete/:deleteKey when public_mode is enabled. Authenticated users can delete snapshots regardless of public_mode setting. The vulnerability stems from insufficient access controls on snapshot endpoints that rely on predictable database keys rather than proper authentication checks.
Summary generated and translated by AI from the official description.
Grafana is an open source data visualization platform. In affected versions unauthenticated and authenticated users are able to view the snapshot with the lowest database key by accessing the literal paths: /dashboard/snapshot/:key, or /api/snapshots/:key. If the snapshot "public_mode" configuration setting is set to true (vs default of false), unauthenticated users are able to delete the snapshot with the lowest database key by accessing the literal path: /api/snapshots-delete/:deleteKey. Regardless of the snapshot "public_mode" setting, authenticated users are able to delete the snapshot with the lowest database key by accessing the literal paths: /api/snapshots/:key, or /api/snapshots-delete/:deleteKey. The combination of deletion and viewing enables a complete walk through all snapshot data while resulting in complete snapshot data loss. This issue has been resolved in versions 8.1.6 and 7.5.11. If for some reason you cannot upgrade you can use a reverse proxy or similar to block access to the literal paths: /api/snapshots/:key, /api/snapshots-delete/:deleteKey, /dashboard/snapshot/:key, and /api/snapshots/:key. They have no normal function and can be disabled without side effects.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H