Antonio Sanso created SLING-4019:
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Summary: ReferrerFilter should have DEFAULT_ALLOW_EMPTY set to
false
Key: SLING-4019
URL: https://issues.apache.org/jira/browse/SLING-4019
Project: Sling
Issue Type: Bug
Reporter: Antonio Sanso
The ReferrerFilter should have DEFAULT_ALLOW_EMPTY set to false.
The reasons is that the attacker can force an empty referrer in at least two
ways:
- is the victim site runs using http the attacker can create a "mallory page"
under an https site. In this case (namely https-to-http) the referrer is not
passed.
- The attacker create a dynamic post doing something like:
{code}
<head>
<script>
function load() {
var postdata = '<form id=dynForm method=POST
action=\'https://www.google.com\'>' +
'<input type=hidden name=email [email protected] />' +
'<input type=hidden name=pass value=password />' +
'<input type=hidden name=locale value=en_US />' +
'</form>';
top.frames[0].document.body.innerHTML=postdata;
top.frames[0].document.getElementById('dynForm').submit();
}
</script>
</head>
<body onload="load()">
<iframe src="about:blank" id="noreferer"></iframe>
</body>
</html>
{code}
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