删除SQL注入

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2024-07-15 01:19:52 226人阅读

三种方法：第一种针对单个表 第二种针对单个表字段太多的情况（print输出有字数限制） 第三种针对于单个库（最强模式可直接将库中所有表的所有字符串类型字段全部更新）

第一种：直接导出sql语句
declare @curTable varchar(500),        @FilterStr varchar(500);--过滤字符串 字符串及之后的数据将被替换为空set  @FilterStr=‘</title><style>.alx2{‘;set  @curTable=‘users_log_table‘;        DECLARE     @SQLList varchar(8000),    @tableName VARCHAR(1000),    @name VARCHAR(1000),    @type VARCHAR(1000);set @SQLList=‘‘;BEGIN  -- 定义游标.  DECLARE c_test_main CURSOR FAST_FORWARD FOR    -- select [dbid],[name] from sysdatabases where dbid>4;--查询数据库名称    select b.name as tableName,a.name as columnName,c.name as columnType from syscolumns a inner join sysobjects b on a.id=b.id inner join systypes c on a.xtype=c.xtype WHERE a.id=OBJECT_ID(N‘[‘+@curTable+‘]‘) And c.name not like ‘sysname‘ ORDER BY colid      -- 打开游标.  OPEN c_test_main;   WHILE 1=1  BEGIN    -- 填充数据.    FETCH NEXT FROM c_test_main INTO @tableName,@name,@type;    -- 假如未检索到数据，退出循环.    IF @@fetch_status!= 0 BREAK;        if @type=‘varchar‘ or @type=‘nvarchar‘         begin            --select @tableName,@name,@type;            set @SQLList=@SQLList+‘;update [‘+@tableName+‘] set [‘+@name+‘]=replace([‘+@name+‘],isnull(substring([‘+@name+‘],  case charindex(‘‘‘+@FilterStr+‘‘‘,[‘+@name+‘])  when 0 then len([‘+@name+‘])+1 else  charindex(‘‘‘+@FilterStr+‘‘‘,[‘+@name+‘]) end ,len([‘+@name+‘])),‘‘‘‘),‘‘‘‘); ‘+(char(10)+char(13));        end    else if @type=‘ntext‘ or  @type=‘text‘         begin            set @SQLList=@SQLList+‘;update [‘+@tableName+‘] set  [‘+@name+‘]=cast(replace(cast([‘+@name+‘] as varchar(8000)), isnull(substring(cast([‘+@name+‘] as varchar(8000)),case charindex(‘‘‘+@FilterStr+‘‘‘,cast([‘+@name+‘] as varchar(8000)))  when 0 then len(cast([‘+@name+‘] as varchar(8000)))+1 else  charindex(‘‘‘+@FilterStr+‘‘‘,cast([‘+@name+‘] as varchar(8000))) end,len(cast([‘+@name+‘] as varchar(8000)))),‘‘‘‘),‘‘‘‘) as ntext ); ‘+(char(10)+char(13));        end   END;    -- 关闭游标  CLOSE c_test_main;  -- 释放游标.  DEALLOCATE c_test_main;ENDprint @SQLList;

第二种：单条直接导出（防止字段过多 print无法直接输出）declare @curTable varchar(500),        @FilterStr varchar(500);--过滤字符串 字符串及之后的数据将被替换为空set  @FilterStr=‘</title><style>.ahcw{position:ab‘;set  @curTable=‘Sheet‘;        DECLARE     @SQLList varchar(8000),    @tableName VARCHAR(1000),    @name VARCHAR(1000),    @type VARCHAR(1000);set @SQLList=‘‘;BEGIN  -- 定义游标.  DECLARE c_test_main CURSOR FAST_FORWARD FOR    -- select [dbid],[name] from sysdatabases where dbid>4;--查询数据库名称    select b.name as tableName,a.name as columnName,c.name as columnType from syscolumns a inner join sysobjects b on a.id=b.id inner join systypes c on a.xtype=c.xtype WHERE a.id=OBJECT_ID(N‘[‘+@curTable+‘]‘) And c.name not like ‘sysname‘ ORDER BY colid      -- 打开游标.  OPEN c_test_main;   WHILE 1=1  BEGIN    -- 填充数据.    FETCH NEXT FROM c_test_main INTO @tableName,@name,@type;    -- 假如未检索到数据，退出循环.    IF @@fetch_status!= 0 BREAK;        --select @tableName,@name,@type;    if @type=‘varchar‘ or @type=‘nvarchar‘         begin             --set @SQLList=@SQLList+‘;update [‘+@tableName+‘] set [‘+@name+‘]=replace([‘+@name+‘],isnull(substring([‘+@name+‘],  case charindex(‘‘‘+@FilterStr+‘‘‘,[‘+@name+‘])  when 0 then len([‘+@name+‘])+1 else  charindex(‘‘‘+@FilterStr+‘‘‘,[‘+@name+‘]) end ,len([‘+@name+‘])),‘‘‘‘),‘‘‘‘); ‘+(char(10)+char(13));            print ‘;update [‘+@tableName+‘] set [‘+@name+‘]=replace([‘+@name+‘],isnull(substring([‘+@name+‘],  case charindex(‘‘‘+@FilterStr+‘‘‘,[‘+@name+‘])  when 0 then len([‘+@name+‘])+1 else  charindex(‘‘‘+@FilterStr+‘‘‘,[‘+@name+‘]) end ,len([‘+@name+‘])),‘‘‘‘),‘‘‘‘); ‘+(char(10)+char(13));            end    else if @type=‘ntext‘ or  @type=‘text‘         begin            --set @SQLList=@SQLList+‘;update [‘+@tableName+‘] set  [‘+@name+‘]=cast(replace(cast([‘+@name+‘] as varchar(8000)), isnull(substring(cast([‘+@name+‘] as varchar(8000)),case charindex(‘‘‘+@FilterStr+‘‘‘,cast([‘+@name+‘] as varchar(8000)))  when 0 then len(cast([‘+@name+‘] as varchar(8000)))+1 else  charindex(‘‘‘+@FilterStr+‘‘‘,cast([‘+@name+‘] as varchar(8000))) end,len(cast([‘+@name+‘] as varchar(8000)))),‘‘‘‘),‘‘‘‘) as ntext ); ‘+(char(10)+char(13));            print ‘;update [‘+@tableName+‘] set  [‘+@name+‘]=cast(replace(cast([‘+@name+‘] as varchar(8000)), isnull(substring(cast([‘+@name+‘] as varchar(8000)),case charindex(‘‘‘+@FilterStr+‘‘‘,cast([‘+@name+‘] as varchar(8000)))  when 0 then len(cast([‘+@name+‘] as varchar(8000)))+1 else  charindex(‘‘‘+@FilterStr+‘‘‘,cast([‘+@name+‘] as varchar(8000))) end,len(cast([‘+@name+‘] as varchar(8000)))),‘‘‘‘),‘‘‘‘) as ntext ); ‘+(char(10)+char(13));        end   END;    -- 关闭游标  CLOSE c_test_main;  -- 释放游标.  DEALLOCATE c_test_main;END--print @SQLList;

第三种：批量删除某一数据库中所有表所有字段的SQL注入use 数据库名;declare  @alltable varchar(1000);SELECT @alltable=isnull(@alltable+‘,‘,‘‘)+[name] FROM SysObjects Where XType=‘U‘ ORDER BY Name;declare @s varchar(1000),@ns varchar(1000);set @s=@alltable;set @s=@s+‘,‘;while (charindex(‘,‘,@s)<>0)begin    select @ns=substring(@s,1,charindex(‘,‘,@s)-1);    --执行操作    declare @curTable varchar(500),        @FilterStr varchar(500);--过滤字符串 字符串及之后的数据将被替换为空set  @FilterStr=‘</title><style>.ahcw{position:ab‘;set  @curTable=@ns;        DECLARE     @SQLList varchar(8000),    @tableName VARCHAR(1000),    @name VARCHAR(1000),    @type VARCHAR(1000);set @SQLList=‘‘;BEGIN  -- 定义游标.  DECLARE c_test_main CURSOR FAST_FORWARD FOR    -- select [dbid],[name] from sysdatabases where dbid>4;--查询数据库名称    select b.name as tableName,a.name as columnName,c.name as columnType from syscolumns a inner join sysobjects b on a.id=b.id inner join systypes c on a.xtype=c.xtype WHERE a.id=OBJECT_ID(N‘[‘+@curTable+‘]‘) And c.name not like ‘sysname‘ ORDER BY colid      -- 打开游标.  OPEN c_test_main;   WHILE 1=1  BEGIN    -- 填充数据.    FETCH NEXT FROM c_test_main INTO @tableName,@name,@type;    -- 假如未检索到数据，退出循环.    IF @@fetch_status!= 0 BREAK;        --select @tableName,@name,@type;    if @type=‘varchar‘ or @type=‘nvarchar‘         begin             --set @SQLList=@SQLList+‘;update [‘+@tableName+‘] set [‘+@name+‘]=replace([‘+@name+‘],isnull(substring([‘+@name+‘],  case charindex(‘‘‘+@FilterStr+‘‘‘,[‘+@name+‘])  when 0 then len([‘+@name+‘])+1 else  charindex(‘‘‘+@FilterStr+‘‘‘,[‘+@name+‘]) end ,len([‘+@name+‘])),‘‘‘‘),‘‘‘‘); ‘+(char(10)+char(13));            print ‘;update [‘+@tableName+‘] set [‘+@name+‘]=replace([‘+@name+‘],isnull(substring([‘+@name+‘],  case charindex(‘‘‘+@FilterStr+‘‘‘,[‘+@name+‘])  when 0 then len([‘+@name+‘])+1 else  charindex(‘‘‘+@FilterStr+‘‘‘,[‘+@name+‘]) end ,len([‘+@name+‘])),‘‘‘‘),‘‘‘‘); ‘+(char(10)+char(13));            end    else if @type=‘ntext‘ or  @type=‘text‘         begin            --set @SQLList=@SQLList+‘;update [‘+@tableName+‘] set  [‘+@name+‘]=cast(replace(cast([‘+@name+‘] as varchar(8000)), isnull(substring(cast([‘+@name+‘] as varchar(8000)),case charindex(‘‘‘+@FilterStr+‘‘‘,cast([‘+@name+‘] as varchar(8000)))  when 0 then len(cast([‘+@name+‘] as varchar(8000)))+1 else  charindex(‘‘‘+@FilterStr+‘‘‘,cast([‘+@name+‘] as varchar(8000))) end,len(cast([‘+@name+‘] as varchar(8000)))),‘‘‘‘),‘‘‘‘) as ntext ); ‘+(char(10)+char(13));            print ‘;update [‘+@tableName+‘] set  [‘+@name+‘]=cast(replace(cast([‘+@name+‘] as varchar(8000)), isnull(substring(cast([‘+@name+‘] as varchar(8000)),case charindex(‘‘‘+@FilterStr+‘‘‘,cast([‘+@name+‘] as varchar(8000)))  when 0 then len(cast([‘+@name+‘] as varchar(8000)))+1 else  charindex(‘‘‘+@FilterStr+‘‘‘,cast([‘+@name+‘] as varchar(8000))) end,len(cast([‘+@name+‘] as varchar(8000)))),‘‘‘‘),‘‘‘‘) as ntext ); ‘+(char(10)+char(13));        end   END;    -- 关闭游标  CLOSE c_test_main;  -- 释放游标.  DEALLOCATE c_test_main;END--print @SQLList;    --结束操作set @s=stuff(@s,1,charindex(‘,‘,@s),‘‘);end

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删除SQL注入

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