Improper access restrictions in Grafana

1) Improper access control

EUVDB-ID: #VU57320

Risk: Medium

CVSSv3.1: 6.2 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:H/RL:O/RC:C]

CVE-ID: CVE-2021-39226

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions to database snapshots. Remote 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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Grafana: 7.5.0 - 8.1.5

External links

http://github.com/grafana/grafana/commit/2d456a6375855364d098ede379438bf7f0667269
http://grafana.com/docs/grafana/latest/release-notes/release-notes-8-1-6/
http://github.com/grafana/grafana/security/advisories/GHSA-69j6-29vr-p3j9
http://grafana.com/docs/grafana/latest/release-notes/release-notes-7-5-11/
http://www.openwall.com/lists/oss-security/2021/10/05/4

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.