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80 lines
3.1 KiB
Text
Executable file
80 lines
3.1 KiB
Text
Executable file
SEC Consult Security Advisory < 20090305-0 >
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========================================================================
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title: NextApp Echo XML Injection Vulnerability
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program: NextApp Echo
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vulnerable version: Echo2 < 2.1.1
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homepage: http://echo.nextapp.com/site/echo2
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found: Feb. 2008
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by: Anonymous / SEC Consult Vulnerability Lab
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permanent link: http://www.sec-consult.com/files/20090305-0_echo_nextapp_xml_injection.txt
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========================================================================
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Vendor description:
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-------------------
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Echo is a platform for building web-based applications that approach the capabilities of rich clients. The applications
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are developed using a component-oriented and event-driven API, eliminating the need to deal with the "page-based"
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nature of browsers. To the developer, Echo works just like a user interface toolkit.
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Vulnerability overview:
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-----------------------
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Unverified XML Data is passed from the client (Webbrowser) to the NextApp Echo Engine and consequently
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to an underlying XML Parser. This leading to a typical XML Injection scenario.
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Vulnerability description:
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--------------------------
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All XML requests for the framework are created by javascript and than sent to the Server via POST HTTP requests.
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A typical requests would look like the following:
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---cut here---
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<client-message xmlns="http://www.nextapp.com/products/echo2/climsg" trans-id="3" focus="c_25"><message-part xmlns="" processor="EchoPropertyUpdate"><property component-id="c_25" name="text">aa</property><property component-id="c_25" name="horizontalScroll" value="0"/><property component-id="c_25" name="verticalScroll" value="0"/></message-part><message-part xmlns="" processor="EchoAction"><action component-id="c_25" name="action"/></message-part></client-message>
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---cut here---
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By manipulating the POST content it is possible to inject arbitrary XML declarations- and tags.
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Proof of concept:
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-----------------
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The following entity declaration would create a new XML entity with the content of the boot.ini file which
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can be referenced in the following XML request content:
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---cut here---
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<?xml version="1.0"?><!DOCTYPE sec [<!ELEMENT sec ANY><!ENTITY mytestentity SYSTEM "file:///c:\boot.ini">]>
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---cut here---
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Vulnerable versions:
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--------------------
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NextApp Echo v2.1.0.rc2
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Vendor contact timeline:
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------------------------
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2009/02/16: Vendor notified via email
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2009/02/24: Patch available
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Patch/Workaround:
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-----------------
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The vendor has released an update which addresses the vulnerability. The update can be downloaded at:
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http://echo.nextapp.com/site/node/5742
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--
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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SEC Consult Unternehmensberatung GmbH
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Office Vienna
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Mooslackengasse 17
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A-1190 Vienna
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Austria
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Tel.: +43 / 1 / 890 30 43 - 0
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Fax.: +43 / 1 / 890 30 43 - 25
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Mail: research at sec-consult dot com
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www.sec-consult.com
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# EOF SEC Consult Vulnerability Lab / @2009
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# milw0rm.com [2009-03-10]
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