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Apple iTunes & AppStore - Filter Bypass & Persistent Invoice Vulnerability

2015-07-27 16:30
Document Title:
Apple iTunes & AppStore - Filter Bypass & Persistent Invoice Vulnerability

References (Source):

Apple Security ID: 623920272

Video: http://www.vulnerability-lab.com/get_content.php?id=1517

Vulnerability Magazine:

Release Date:

Vulnerability Laboratory ID (VL-ID):

Common Vulnerability Scoring System:

Product & Service Introduction:
Apple Inc. is an American multinational technology company headquartered in Cupertino, California, that designs,
develops, and sells consumer electronics,
computer software, online services, and personal computers. Its best-known hardware products are the Mac line of
computers, the iPod media player, the
iPhone smartphone, the iPad tablet computer, and the Apple Watch smartwatch. Its online services include iCloud, the
iTunes Store, and the App Store.
Apple`s consumer software includes the OS X and iOS operating systems, the iTunes media browser, the Safari web
browser, and the iLife and iWork
creativity and productivity suites.

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

Abstract Advisory Information:
The Vulnerability Laboratory discovered an application-side input validation web vulnerability in the official Apple -
App Store and iTunes Store online-service web-application.

Vulnerability Disclosure Timeline:
2015-06-08: Researcher Notification & Coordination (Benjamin Kunz Mejri)
2015-06-09: Vendor Notification (Apple Product Security Team)
2015-**-**: Vendor Response/Feedback (Apple Product Security Team)
2015-**-**: Vendor Fix/Patch Notification (Apple Developer Team)
2015-07-27: Public Disclosure (Vulnerability Laboratory)

Discovery Status:

Affected Product(s):
Product: iTunes & AppStore - Online Service (Web-Application) 2015 Q2

Exploitation Technique:

Severity Level:

Technical Details & Description:
An application-side input validation web vulnerability has been discovered in the official Apple - App Store and iTunes
Store online-service web-application.
The vulnerability allows remote attackers to inject own malicious script codes to the application-side of the
vulnerable context function or service module.

The apple itunes and appstore is taking the device cell name of the buying users. Remote attackers can manipulate the
name value by an exchange with script code (special chars).
After that the attacker buys any article in the appstore or itunes-store. During that procedure the internal appstore
service takes the device value and does encode it with wrong conditions.
The seller account context runs since the error with the injected script code occurs and gets this way re-implemented
to the invoice. Thus results in an application-side script code execution
in the invoice of apple. Remote attackers can manipulate the issue by interaction via persisten manipulated context to
other apple store user accounts. The vulnerability can be exploited by
remote attackers and the malicious receiver/sender email is * () email apple com The invoice is present to both
parties (buyer & seller) which demonstrates a significant risk to buyers, sellers
or apple website managers/developers. The issue imapct also the risk that a buyer can be the seller by usage of the
same name to compromise the store online service integrity.

The security risk of the persistent input validation and mail encoding web vulnerability is estimated as high with a
cvss (common vulnerability scoring system) count of 5.8.
Exploitation of the persistent input validation and mail encoding web vulnerability requires a low privilege apple
(appstore/icloud) account and low or medium user interaction.
Successful exploitation of the vulnerability results in session hijacking, persistent phishing attacks, persistent
redirect to external sources and persistent manipulation of
affected or connected service module context.

Vulnerable Module(s):
[+] Apple Invoice

Vulnerable Parameter(s):
[+] device-cell
[+] type cell

Affected Service(s):
[+] Appstore & iTunes

[+] @email.apple.com

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

Sender: * () email apple com

Manual steps to reproduce the vulnerability ...
1. Inject script code to your device cell name ;)
2. Buy an article by usage of the apple itunes or appstore online-service (via app or desktop browser)
3. Choose any app or movie that you would like to buy and download it
4. After the download an invoice arrives to the users inbox
Note: The appstore runs since the gets the wrong encoded values and stops which results in the manipulated device name
value in the seller name input
5. The application-side injected script code execution occurs in the arrived emails context next to the device-cell and
type cell value parameters
6. Successful reproduce of the remote vulnerability!

PoC: Ihre Rechnung von Apple (Your Invoice by Apple)

<tbody><tr style="background-color: rgb(245,245,245);" class="section-header" height="24">
<td colspan="2"
style="width:350px;padding-left:10px;border-top-left-radius:3px;border-bottom-left-radius:3px;" width="350"><span
style="font-size:14px;font-weight:500;">App Store</span></td>
<td style="width:100px;padding-left:20px;" width="100"><span
<td style="width:120px;padding-left:20px;" width="120"><span
style="color:rgb(153,153,153);font-size:10px;position:relative;top:1;">GEKAUFT BEI</span></td>
<td style="width:100px;padding-right:
20px;position:relative;top:1;border-top-right-radius:3px;border-bottom-right-radius:3px;" width="90"
align="right"><span style="color:rgb(153,153,153);font-size:10px;white-


<tr height="90">
<td class="artwork-cell" style="padding:0 0 0 20px;margin:0;height:60px;width:60px;" width="60" align="center">
alt="DuckTales: Remastered" style="border:none;padding:0;margin:0;-ms-interpolation-mode:

bicubic;border-radius:14px;border:1px solid rgba(128,128,128,0.2);" border="0" height="60" width="60">
<td style="padding:0 0 0 20px;width:260px;line-height:15px;" class="item-cell" width="260">
<span class="title" style="font-weight:600;">DuckTales: Remastered</span><br>
<span class="artist" style="color:rgb(153,153,153);">Disney</span><br> <span
class="item-links" style="font-size:10px;">
style="color:#0073ff;">Eine Rezension schreiben</a>Â |Â <a

style="color:#0073ff;">Problem melden</a> </span>
<td class="type-cell" style="padding:0 0 0 20px;width:100px;" width="100">
<span style="color:rgb(153,153,153)">App</span></td>
<td class="device-cell" style="padding:0 0 0 20px;width:120px;" width="120">
<span style="color:rgb(153,153,153);">[PERSISTENT INJECTED SCRIPT CODE VULNERABILITY!]bkm337"><img src="x">%20<iframe
<td width="90" class="price-cell" align="right" style="padding:0 20px 0 0;width:100px;"><span
style="font-weight:600;white-space:nowrap;">9,99 €</span></td>

Note: We used the ducktales remake app to approve the zero-day remote vulnerability in the itunes and appstore without
malicious perpose!


Security Risk:
The security risk of the application-side input validation and mail encoding web vulnerability in the invoice module is
estimated as high. (CVSS 5.8)

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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