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SqlServer中批量替换被插入的木马记录

WBOY
Release: 2016-06-07 18:02:12
Original
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最近公司做的一个事业性质网站被黑客攻击了,通过sql注入方式,把木马注入了数据库,整个MSSQL SERVER 的数据都被附加上恶意脚本了

最近找了找 批量替换被插入的木马记录,找到了一条好的语句,用处很大,仅仅使用十几行游标语句,把整个数据库的所有表的恶 意木马清除掉了,而且在Google搜索到此记录几率很小,在此专门转载一下!为了以后自己能找得到,也希望后人能得到帮助。
原文如下:
代码如下:
declare @t varchar(555),@c varchar(555) ,@inScript varchar(8000)
set @inScript='恶意代码'
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(cast(['+@c+'] as varchar(8000)),'''+@inScript+''','''')' )
fetch next from table_cursor into @t,@c
end
close table_cursor
deallocate table_cursor;

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):
代码如下:
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
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