`SEC Consult Security Advisory < 20090305-0 > ======================================================================== title: NextApp Echo XML Injection Vulnerability program: NextApp Echo vulnerable version: Echo2 < 2.1.1 homepage: http://echo.nextapp.com/site/echo2 found: Feb. 2008 by: Anonymous / SEC Consult Vulnerability Lab permanent link: http://www.sec-consult.com/files/20090305-0_echo_nextapp_xml_injection.txt ======================================================================== Vendor description: ------------------- Echo is a platform for building web-based applications that approach the capabilities of rich clients. The applications are developed using a component-oriented and event-driven API, eliminating the need to deal with the "page-based" nature of browsers. To the developer, Echo works just like a user interface toolkit. Vulnerability overview: ----------------------- Unverified XML Data is passed from the client (Webbrowser) to the NextApp Echo Engine and consequently to an underlying XML Parser. This leading to a typical XML Injection scenario. Vulnerability description: -------------------------- All XML requests for the framework are created by javascript and than sent to the Server via POST HTTP requests. A typical requests would look like the following: ---cut here---

---cut here--- By manipulating the POST content it is possible to inject arbitrary XML declarations- and tags. Proof of concept: ----------------- The following entity declaration would create a new XML entity with the content of the boot.ini file which can be referenced in the following XML request content: ---cut here--- ]> ---cut here--- Vulnerable versions: -------------------- NextApp Echo v2.1.0.rc2 Vendor contact timeline: ------------------------ 2009/02/16: Vendor notified via email 2009/02/24: Patch available Patch: ----------------- The vendor has released an update which addresses the vulnerability. The update can be downloaded at: http://echo.nextapp.com/site/node/5742 -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ SEC Consult Unternehmensberatung GmbH Office Vienna Mooslackengasse 17 A-1190 Vienna Austria Tel.: +43 / 1 / 890 30 43 - 0 Fax.: +43 / 1 / 890 30 43 - 25 Mail: research at sec-consult dot com www.sec-consult.com # EOF SEC Consult Vulnerability Lab / @2009 `

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