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Date: Thu, 9 Dec 2021 17:07:13 +0100
From: Daniel Lee <daniel@...fana.com>
To: oss-security@...ts.openwall.com
Subject: CVE-2021-43798 Grafana directory traversal
We released Grafana 8.3.1, 8.2.7, 8.1.8, 8.0.7 on December 7th. This patch
release includes a high severity security fix that affects Grafana versions
from v8.0.0-beta1 through v8.3.0.
Release v8.3.1, only containing a security fix:
- [Download Grafana 8.3.1](https://grafana.com/grafana/download/8.3.1)
- [Release notes](
https://grafana.com/docs/grafana/latest/release-notes/release-notes-8-3-1/)
Release v8.2.7, only containing a security fix:
- [Download Grafana 8.2.7](https://grafana.com/grafana/download/8.2.7)
- [Release notes](
https://grafana.com/docs/grafana/latest/release-notes/release-notes-8-2-7/)
Release v8.1.8, only containing a security fix:
- [Download Grafana 8.1.8](https://grafana.com/grafana/download/8.1.8)
- [Release notes](
https://grafana.com/docs/grafana/latest/release-notes/release-notes-8-1-8/)
Release v8.0.7, only containing a security fix:
- [Download Grafana 8.0.7](https://grafana.com/grafana/download/8.0.7)
- [Release notes](
https://grafana.com/docs/grafana/latest/release-notes/release-notes-8-0-7/)
## Path Traversal ([CVE-2021-43798](
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-43798))
### Summary
On 2021-12-03, we received a report that Grafana is vulnerable to directory
traversal, allowing access to local files. We have confirmed this for
versions 8.0.0-beta1 to 8.3.0. Thanks to our defense-in-depth approach, at
no time has [Grafana Cloud](https://grafana.com/cloud) been vulnerable.
The vulnerable URL path is: <grafana_host_url>/public/plugins/<plugin-id>/,
where <plugin-id> is the plugin ID for any installed plugin.
Every Grafana instance comes with pre-installed plugins like the Prometheus
plugin or MySQL plugin so the following URLs are vulnerable for every
instance:
* <grafana_host_url>/public/plugins/alertlist/
* <grafana_host_url>/public/plugins/annolist/
* <grafana_host_url>/public/plugins/barchart/
* <grafana_host_url>/public/plugins/bargauge/
* <grafana_host_url>/public/plugins/candlestick/
* <grafana_host_url>/public/plugins/cloudwatch/
* <grafana_host_url>/public/plugins/dashlist/
* <grafana_host_url>/public/plugins/elasticsearch/
* <grafana_host_url>/public/plugins/gauge/
* <grafana_host_url>/public/plugins/geomap/
* <grafana_host_url>/public/plugins/gettingstarted/
* <grafana_host_url>/public/plugins/grafana-azure-monitor-datasource/
* <grafana_host_url>/public/plugins/graph/
* <grafana_host_url>/public/plugins/heatmap/
* <grafana_host_url>/public/plugins/histogram/
* <grafana_host_url>/public/plugins/influxdb/
* <grafana_host_url>/public/plugins/jaeger/
* <grafana_host_url>/public/plugins/logs/
* <grafana_host_url>/public/plugins/loki/
* <grafana_host_url>/public/plugins/mssql/
* <grafana_host_url>/public/plugins/mysql/
* <grafana_host_url>/public/plugins/news/
* <grafana_host_url>/public/plugins/nodeGraph/
* <grafana_host_url>/public/plugins/opentsdb
* <grafana_host_url>/public/plugins/piechart/
* <grafana_host_url>/public/plugins/pluginlist/
* <grafana_host_url>/public/plugins/postgres/
* <grafana_host_url>/public/plugins/prometheus/
* <grafana_host_url>/public/plugins/stackdriver/
* <grafana_host_url>/public/plugins/stat/
* <grafana_host_url>/public/plugins/state-timeline/
* <grafana_host_url>/public/plugins/status-history/
* <grafana_host_url>/public/plugins/table/
* <grafana_host_url>/public/plugins/table-old/
* <grafana_host_url>/public/plugins/tempo/
* <grafana_host_url>/public/plugins/testdata/
* <grafana_host_url>/public/plugins/text/
* <grafana_host_url>/public/plugins/timeseries/
* <grafana_host_url>/public/plugins/welcome/
* <grafana_host_url>/public/plugins/zipkin/
We have received CVE-2021-43798 for this issue. The CVSS score for this
vulnerability is 7.5 High (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N)
for Grafana versions 8.0.0-beta1 to 8.3.0
### Affected versions with high severity
Grafana 8.0.0-beta1 to 8.3.0
### Solutions and mitigations
All installations between v8.0.0-beta1 and v8.3.0 should be upgraded as
soon as possible.
If you can not upgrade, running a reverse proxy in front of Grafana that
normalizes the PATH of the request will mitigate the vulnerability. For
example the normalize_path
<https://www.envoyproxy.io/docs/envoy/latest/api-v3/extensions/filters/network/http_connection_manager/v3/http_connection_manager.proto#envoy-v3-api-field-extensions-filters-network-http-connection-manager-v3-httpconnectionmanager-normalize-path>
setting in envoy.
Thanks to our defense-in-depth approach, [Grafana Cloud](
https://grafana.com/cloud) instances have not been affected by the
vulnerability.
As always, we closely coordinated with all cloud providers licensed to
offer Grafana Pro. They have received early notification under embargo and
confirmed that their offerings are secure at the time of this announcement.
In alphabetical order, this is applicable to Amazon Managed Grafana, and
Azure Managed Grafana.
### Timeline and postmortem
Here is a detailed timeline starting from when we originally learned of the
issue. All times in UTC.
* 2021-12-03: Security researcher sends the initial report
* 2021-12-03: Confirmed for 8.0.0-beta1 through 8.3.0
* 2021-12-03: Confirmed that Grafana Cloud is not vulnerable
* 2021-12-03: Security fix determined and committed to Git
* 2021-12-03: Release timeline determined: 2021-12-07 for private customer
release, 2021-12-14 for public release
* 2021-12-06: Second report about the vulnerability received
* 2021-12-07: We received information that the vulnerability has been
leaked to the public, turning it into a 0day
* 2021-12-07: Decision made to release as quickly as feasible
* 2021-12-07: Private release with two hour grace period
* 2021-12-07: Public release
## Reporting security Issues
If you think you have found a security vulnerability, please send a report
to [security@...fana.com](mailto:security@...fana.com). This address can be
used for all of
Grafana Labs' open source and commercial products (including but not
limited to Grafana, Grafana Cloud, Grafana Enterprise, and grafana.com). We
can accept only vulnerability reports at this address. We would prefer that
you encrypt your message to us by using our PGP key. The key fingerprint is
F988 7BEA 027A 049F AE8E 5CAA D125 8932 BE24 C5CA
The key is available from [keyserver.ubuntu.com](
https://keyserver.ubuntu.com/pks/lookup?search=0xF9887BEA027A049FAE8E5CAAD1258932BE24C5CA&fingerprint=on&op=index
).
## Security announcements
We maintain a [security category on our blog}(
https://grafana.com/tags/security/),
where we will always post a summary, remediation, and mitigation details
for any patch containing security fixes.
You can also subscribe to our [RSS feed](
https://grafana.com/tags/security/index.xml).
Regards,
Daniel Lee, Grafana Labs
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