CVE-2021-39226 Grafana Authentication Bypass
Attackers can bypass authentication to view and delete Grafana snapshots, leading to data exposure and loss.
- Exploited in the wild
- Since 25 Aug 2022
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-39226?
CVE-2021-39226 is a critical authentication bypass vulnerability in Fedoraproject Fedora, published on 5 Oct 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Which versions are affected by CVE-2021-39226?
5 open source packages ship an affected version, including github.com/grafana/grafana and grafana. It affects 2 products.
| Package | Affected | Fixed in |
|---|---|---|
github.com/grafana/grafana Go | All versions | 7.5.11 |
github.com/grafana/grafana Go | All versions | 7.5.11 |
github.com/grafana/grafana Go | From 8.0.0 | 8.1.6 |
github.com/grafana/grafana Go | From 8.0.0 | 8.1.6 |
grafana Bitnami | All versions | 7.5.11, 8.1.6 |
Linux distribution packages (32)
grafana Red Hat:enterprise_linux:8::appstream | All versions | 0:7.3.6-3.el8_4 |
grafana-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:7.3.6-3.el8_4 |
grafana Red Hat:rhel_eus:8.1::appstream | All versions | 0:6.2.2-7.el8_1 |
grafana-azure-monitor Red Hat:rhel_eus:8.1::appstream | All versions | 0:6.2.2-7.el8_1 |
grafana-cloudwatch Red Hat:rhel_eus:8.1::appstream | All versions | 0:6.2.2-7.el8_1 |
grafana-debuginfo Red Hat:rhel_eus:8.1::appstream | All versions | 0:6.2.2-7.el8_1 |
grafana-elasticsearch Red Hat:rhel_eus:8.1::appstream | All versions | 0:6.2.2-7.el8_1 |
grafana-graphite Red Hat:rhel_eus:8.1::appstream | All versions | 0:6.2.2-7.el8_1 |
grafana-influxdb Red Hat:rhel_eus:8.1::appstream | All versions | 0:6.2.2-7.el8_1 |
grafana-loki Red Hat:rhel_eus:8.1::appstream | All versions | 0:6.2.2-7.el8_1 |
grafana-mssql Red Hat:rhel_eus:8.1::appstream | All versions | 0:6.2.2-7.el8_1 |
grafana-mysql Red Hat:rhel_eus:8.1::appstream | All versions | 0:6.2.2-7.el8_1 |
grafana-opentsdb Red Hat:rhel_eus:8.1::appstream | All versions | 0:6.2.2-7.el8_1 |
grafana-postgres Red Hat:rhel_eus:8.1::appstream | All versions | 0:6.2.2-7.el8_1 |
grafana-prometheus Red Hat:rhel_eus:8.1::appstream | All versions | 0:6.2.2-7.el8_1 |
grafana-stackdriver Red Hat:rhel_eus:8.1::appstream | All versions | 0:6.2.2-7.el8_1 |
grafana Red Hat:rhel_eus:8.2::appstream | All versions | 0:6.3.6-3.el8_2 |
grafana-azure-monitor Red Hat:rhel_eus:8.2::appstream | All versions | 0:6.3.6-3.el8_2 |
grafana-cloudwatch Red Hat:rhel_eus:8.2::appstream | All versions | 0:6.3.6-3.el8_2 |
grafana-debuginfo Red Hat:rhel_eus:8.2::appstream | All versions | 0:6.3.6-3.el8_2 |
grafana-elasticsearch Red Hat:rhel_eus:8.2::appstream | All versions | 0:6.3.6-3.el8_2 |
grafana-graphite Red Hat:rhel_eus:8.2::appstream | All versions | 0:6.3.6-3.el8_2 |
grafana-influxdb Red Hat:rhel_eus:8.2::appstream | All versions | 0:6.3.6-3.el8_2 |
grafana-loki Red Hat:rhel_eus:8.2::appstream | All versions | 0:6.3.6-3.el8_2 |
grafana-mssql Red Hat:rhel_eus:8.2::appstream | All versions | 0:6.3.6-3.el8_2 |
grafana-mysql Red Hat:rhel_eus:8.2::appstream | All versions | 0:6.3.6-3.el8_2 |
grafana-opentsdb Red Hat:rhel_eus:8.2::appstream | All versions | 0:6.3.6-3.el8_2 |
grafana-postgres Red Hat:rhel_eus:8.2::appstream | All versions | 0:6.3.6-3.el8_2 |
grafana-prometheus Red Hat:rhel_eus:8.2::appstream | All versions | 0:6.3.6-3.el8_2 |
grafana-stackdriver Red Hat:rhel_eus:8.2::appstream | All versions | 0:6.3.6-3.el8_2 |
grafana Rocky Linux:8 | All versions | 0:7.3.6-3.el8_4 |
grafana openSUSE:Tumbleweed | All versions | 7.5.11-3.1 |
Products include Fedoraproject Fedora, Grafana Grafana.
How do I fix CVE-2021-39226?
Upgrade github.com/grafana/grafana to a fixed version for your release line: 7.5.11 or 8.1.6. US federal agencies must fix it by 15 Sep 2022.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2021-39226 being exploited?
Yes. Attackers have exploited CVE-2021-39226 in the wild since at least 25 Aug 2022.
Public exploit code: 1 Nuclei template.
Other vulnerabilities in Fedoraproject Fedora
Sources
Also known as BIT-grafana-2021-39226, GHSA-69j6-29vr-p3j9, RHSA-2021:3769, RHSA-2021:3770, RHSA-2021:3771, RLSA-2021:3771 and 2 more.