新云网站管理系统2.1SP1任意文件下载漏洞

<%
Dim url,strUrl,strPath
url = Replace(Replace(Replace(Request("url"), "'", ""), "%", ""), "\", "/")
//首先先进行一些字符的替换，'换成空，%也换成空，\换成/

If Len(url) > 3 Then
 If Left(url,1) = "/" Then
 Response.Redirect url //如果用户提交的url第一个字符是/，那直接转向url
 End If
 If Left(url,3) = "../" Then
 Response.Redirect url //同上，意思就是不给你用../跳转目录
 End If
 strUrl = Left(url,10)
 If InStr(strUrl, "://") > 0 Then //这个，汗·～～://不懂干什么用的
 Response.Redirect url
 End If
 If InStr(url, "/") > 0 Then
 strPath = Server.MapPath(".") & "\" & url //补充物理地址了
 strPath = Replace(strPath, "/", "\") //替换/为\呢
 Call downThisFile(strPath) //HOHO～～开始下载了
 Else
 Response.Redirect url
 End If
End If

Sub downThisFile(thePath)
 Response.Clear
 On Error Resume Next
 Dim stream, fileName, fileContentType
 
 fileName = split(thePath,"\")(UBound(split(thePath,"\")))
 Set stream = Server.CreateObject("adodb.stream")
 stream.Open
 stream.Type = 1
 stream.LoadFromFile(thePath)
 Response.AddHeader "Content-Disposition", "attachment; filename=" & fileName
 Response.AddHeader "Content-Length", stream.Size
 Response.Charset = "UTF-8"
 Response.ContentType = "application/octet-stream"
 Response.BinaryWrite stream.Read
 Response.Flush
 stream.Close
 Set stream = Nothing
End Sub
%>