sql注入数据库修复方法

绝地灬酷狼 2022-09-12 05:55 178阅读 0赞

1.第一种情况是 需要将指定的 注入字符串全部替换掉（仅替换注入的字符串为空）

declare @delStr nvarchar(500) 
    set @delStr='<script src=http://www.111cn.net/js/common.js></script>' --这里被注入的字段串 
    /****************************************/
    /**********以下为操作实体************/ 
    set nocount on
    declare @tableName nvarchar(100),@columnName nvarchar(100),@tbID int,@iRow int,@iResult int 
    declare @sql nvarchar(2000)
    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 
    select name from syscolumns where xtype in (231,167,239,175, 35, 99) and id=@tbID 
    open cur1 
    fetch next from cur1 into @columnName 
    while @@fetch_status=0 
    begin 
    set @sql='update [' + @tableName + '] set ['+ @columnName +']= SUBSTRING([' + @columnName + '],' + '1, PATINDEX( ''%' + @delStr + '%'', [' + @columnName + '])-1) + ' + 'SUBSTRING([' + @columnName + '], PATINDEX( ''%' + @delStr + '%'', [' + @columnName + ']) + ' + 'len(''' + @delStr + ''') , datalength([' + @columnName + '])) 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 '数据库教程共有'+convert(varchar(10),@iResult)+'条记录被更新!!!'
    close cur 
    deallocate cur 
    set nocount off

2.第二种是  需要将注入到表中起始位置到最后都删掉。（此种方法直接找到注入的起始位置，后面的全部删掉）

--恢复被注入数据库 
    --2013-09-26
    declare @delStr nvarchar(500) 
    set @delStr='</title><style>.' --被注入的字段串的开始采样，从此位置后面的数据都为注入数据
    
    /**********以下为操作实体************/ 
    set nocount on
    declare @tableName nvarchar(100),@columnName nvarchar(100),@tbID int,@iRow int,@iResult int 
    declare @sql nvarchar(2000)
    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 
    select name from syscolumns where xtype in (231,167,239,175, 35, 99) and id=@tbID 
    open cur1 
    fetch next from cur1 into @columnName 
    while @@fetch_status=0 
    begin 
    set @sql='update [' + @tableName + '] set ['+ @columnName +']=
     SUBSTRING([' + @columnName + '],1, PATINDEX( ''%' + @delStr + '%'', [' + @columnName + '])-1)   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 '数据库教程共有'+convert(varchar(10),@iResult)+'条记录被更新!!!'
    close cur 
    deallocate cur 
    set nocount off