Apple iOS v12.1.1 - Combo Passcode Bypass Vulnerability

Document Title:
===============
Apple iOS v12.1.1 - Combo Passcode Bypass Vulnerability


References:
===========
https://www.vulnerability-lab.com/get_content.php?id=2169

Watch Video: https://www.youtube.com/watch?v=QjhV59-NA60

Advisory: https://www.vulnerability-lab.com/get_content.php?id=2162

Vulnerability Magazine: https://www.vulnerability-db.com/?q=articles/2018/12/24/apple-ios-120-1211-passcode-bypass-vulnerability



Release Date:
=============
2018-12-24


Vulnerability Laboratory ID (VL-ID):
====================================
2169


Common Vulnerability Scoring System:
====================================
6.3


Vulnerability Class:
====================
Authentication Bypass


Current Estimated Price:
========================
10.000€ - 25.000€


Vulnerability Disclosure Timeline:
==================================
2018-10-22: Researcher Notification & Coordination (Security Researcher)
2018-11-01: Vendor Notification (Security Department)
2018-11-12: Vendor Response/Feedback #1 (Security Department) - Not able to reproduce
2018-12-15: Vendor Response/Feedback #2 (Security Department) - Not able to reproduce
2018-**-**: Vendor Fix/Patch (Service Developer Team)
2018-**-**: Security Acknowledgements  (Security Department)
2018-12-24: Public Disclosure (Vulnerability Laboratory)


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


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


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


Authentication Type:
====================
Open Authentication (Anonymous Privileges)


User Interaction:
=================
No User Interaction


Disclosure Type:
================
Independent Security Research


Technical Details & Description:
================================
The video shows the access to the contacts list from outside by usage of the screenshot function. The requirements are siri, voiceover, sms answer (custom), 
screenshot edit function, signature menu and a camera app part as default setup. We can confirm the issue for the newst ios 12.0, 12.1 and 12.1.1 version after patch. 
We tested with iphone 6s and iphone 7 and no default setting has been modified. The video shows clearly the impact 
of the problematic in best quality.

The access permission vulnerability is located in the message menu to answer custom messages in combination with 
the available default app functions of the ios device. The issue allows to combine different methods used to access 
and edit photos in the restricted mode. Using a hidden menu in combination with a glitch allows local attackers to 
access sensitive idevice data like contacts, the pictures library or default applications. The issue bypassed with 
the default permissions and the basic security protection of the newst 12.1.1 ios devices. The problem is located 
when processing the permissions when editing and writing images during the usage of siri and custom sms answer.


Credits & Authors:
==================
Benjamin K.M. [[email protected]] - https://www.vulnerability-lab.com/show.php?user=Benjamin+K.M.


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