Background exploitation KEV catalog No authentication

CVE-2021-39226

Grafana Authentication Bypass Vulnerability

CheckOps priority index

9.3/10 Patch within 24 h

Severity9.8

Probability10.0

Exploitation4/5

Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.

EPSS · today 99.9% higher than 99.97% of CVEs

CVSS 3.1 9.8 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:

Exploited for 1,531 days 25 Aug 2022

CISA due date 15 Sept 2022 for US federal agencies

Exploitation probability EPSS · FIRST

EPSS probability (%)Percentile among all CVEs

Exploitation signals 4 / 5

KEV catalog (CISA)25 Aug 2022
Exploited in EUVD (ENISA)25 Aug 2022
Used by ransomwareno
EPSS above 10 %99.9%
No account, over the networkyes

What to do

Fix

Update to a fixed version: 7.5.11 8.1.6

CISA guidance: Apply updates per vendor instructions.

Meanwhile

Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.

Manufacturers (CRA)

Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained

Description ENISA EUVD

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.

Affected products

Grafana

Affected versions

8.0.0, < 8.1.6
< 7.5.11

Weaknesses (CWE)

CWE-287

Open source packages OSV

github.com/grafana/grafanaGo · GHSA-69j6-29vr-p3j9
fixed in 7.5.11
github.com/grafana/grafanaGo · GHSA-69j6-29vr-p3j9
fixed in 8.1.6

Timeline

05 Oct 2021
Published
25 Aug 2022
Exploitation reported (ENISA)
25 Aug 2022
Added to the KEV catalog
15 Sept 2022
CISA remediation due date
26 Sept 2026
EPSS peak: 99.9%

References

Other exploited vulnerabilities from the same vendor

CVE-2021-43798Grafana Path Traversal Vulnerability
8.1 · Background exploitation