利用Request对象的包解析漏洞绕过防注入程序

<%
Dim Query_Badword,Form_Badword,i,Err_Message,Err_Web,name
------定义部份 头----------------------------------------------------------------------
Err_Message = 1 处理方式：1=提示信息,2=转向页面,3=先提示再转向
Err_Web = "Err.Asp" 出错时转向的页面
Query_Badword="∥and∥select∥update∥chr∥delete∥%20from∥;∥insert∥mid∥master.∥set∥chr(37)∥="
在这部份定义get非法参数,使用"∥"号间隔
Form_Badword="∥%∥&∥*∥#∥(∥)∥=" 在这部份定义post非法参数,使用"∥"号间隔
------定义部份 尾-----------------------------------------------------------------------

On Error Resume Next
----- 对 get query 值 的过滤.
if request.QueryString<>"" then
response.write "QueryString :" & request.QueryString & "
"
Chk_badword=split(Query_Badword,"∥")
FOR EACH Query_Name IN Request.QueryString
for i=0 to ubound(Chk_badword)
If Instr(LCase(request.QueryString(Query_Name)),Chk_badword(i))<>0 Then
response.write request.QueryString(Query_Name) & "出现关键词" & Chk_badword(i) &"
"
Select Case Err_Message
Case "1"
Response.Write "传参错误！参数 "&name&" 的值中包含非法字符串！\n\n请不要在参数中出现：and update delete ; insert mid master 等非法字符"
Case "2"
Response.Write "<Script Language=JavaScript>location.href="&Err_Web&"</Script>"
Case "3"
Response.Write "<Script Language=JavaScript>alert(传参错误！参数 "&name&"的值中包含非法字符串！\n\n请不要在参数中出现：and update delete ; insert mid master 等非法字符！);location.href="&Err_Web&";</Script>"
End Select
Response.End
End If
NEXT
NEXT
End if
-----对 post 表 单值的过滤.
if request.form<>"" then
Chk_badword=split(Form_Badword,"∥")
FOR EACH name IN Request.Form
for i=0 to ubound(Chk_badword)
If Instr(LCase(request.form(name)),Chk_badword(i))<>0 Then
response.write request.form(name) & "出现关键词" & Chk_badword(i) &"
"
Select Case Err_Message
Case "1"
Response.Write "出错了！表单 "&name&" 的值中包含非法字符串！\n\n请不要在表单中出现： % & * # ( ) 等非法字符！"
Case "3"
Response.Write "出错了！参数 "&name&"的值中包含非法字符串！\n\n请不要在表单中出现： % & * # ( ) 等非法字符！"
End Select
Response.End
End If
NEXT
NEXT
end if
%>