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https://issues.apache.org/jira/browse/SLING-4019?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Antonio Sanso reassigned SLING-4019:
------------------------------------
Assignee: Antonio Sanso
> 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
> Assignee: 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 value=exam...@live.com />'
> +
> '<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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