CVE-2021-39226
Grafana Authentication Bypass
- Published5 Oct 2021
- Added to CISA KEV25 Aug 2022
- Remediation due15 Sept 2022
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 breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HAffected products
Remediation
References
- https://github.com/grafana/grafana/commit/2d456a6375855364d098ede379438bf7f0667269
- https://github.com/grafana/grafana/security/advisories/GHSA-69j6-29vr-p3j9
- https://grafana.com/docs/grafana/latest/release-notes/release-notes-7-5-11/
- https://grafana.com/docs/grafana/latest/release-notes/release-notes-8-1-6/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DCKBFUSY6V4VU5AQUYWKISREZX5NLQJT/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/E6ANHRDBXQT6TURLP2THM26ZPDINFBEG/
- https://security.netapp.com/advisory/ntap-20211029-0008/
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-39226
- http://www.openwall.com/lists/oss-security/2021/10/05/4
Related CVEs
Recent high-severity vulnerabilities sharing a weakness type.
Frequently asked
Is CVE-2021-39226 being actively exploited?
Yes. CVE-2021-39226 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 25 Aug 2022.
How severe is CVE-2021-39226?
CVE-2021-39226 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 99.9% probability of exploitation.
Which products are affected by CVE-2021-39226?
Affected products include Grafana, Fedoraproject Fedora.
How do I fix CVE-2021-39226?
Upgrade affected software to a fixed version, for example Grafana 8.1.6 or later, then confirm no affected versions remain in your inventory.
How Secuno handles this
Secuno correlates vulnerabilities like CVE-2021-39226 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.
Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.