Apple iOS 8.0.2 Authentication Bypass Vulnerability

Document Title:
Apple iOS 8.0 – 8.0.2 – Controls Re Auth Bypass Vulnerability

Product & Service Introduction:
iOS (previously iPhone OS) is a mobile operating system developed and distributed by Apple Inc. Originally released in 2007 for
the iPhone and iPod Touch, it has been extended to support other Apple devices such as the iPad and Apple TV. Unlike Microsoft`s
Windows Phone (Windows CE) and Google`s Android, Apple does not license iOS for installation on non-Apple hardware. As of
September 12, 2012, Apple`s App Store contained more than 700,000 iOS applications, which have collectively been downloaded more
than 30 billion times. It had a 14.9% share of the smartphone mobile operating system units shipped in the third quarter of 2012,
behind only Google`s Android. In June 2012, it accounted for 65% of mobile web data consumption (including use on both the iPod
Touch and the iPad). At the half of 2012, there were 410 million devices activated. According to the special media event held by
Apple on September 12, 2012, 400 million devices have been sold through June 2012.

The user interface of iOS is based on the concept of direct manipulation, using multi-touch gestures. Interface control elements
consist of sliders, switches, and buttons. Interaction with the OS includes gestures such as swipe, tap, pinch, and reverse pinch,
all of which have specific definitions within the context of the iOS operating system and its multi-touch interface. Internal
accelerometers are used by some applications to respond to shaking the device (one common result is the undo command) or rotating
it in three dimensions (one common result is switching from portrait to landscape mode).

iOS is derived from OS X, with which it shares the Darwin foundation. iOS is Apple`s mobile version of the OS X operating system
used on Apple computers.

In iOS, there are four abstraction layers: the Core OS layer, the Core Services layer, the Media layer, and the Cocoa Touch layer.
The current version of the operating system (iOS 6.1) dedicates 1-1.5 GB of the device`s flash memory for the system partition,
using roughly 800 MB of that partition (varying by model) for iOS itself. iOS currently runs on iPhone, Apple TV, iPod Touch, and iPad.

( Copy of the Homepage: )

Technical Details & Description:
A local pass code (code lock) bypass and glitch has been discovered in the Apple iOS v8.0 (12A365) mobile device system.
The vulnerability allows to bypass or evade via glitch the regular pass code restriction of the embed iOS device system.

The local bypass vulnerability is located in the favorite contact preview function that can be used for imessages or phone calls.
Local attackers with physical access can glitch the display by usage of siri to bypass since the end of a call the device system
access restriction.

To exploit the attacker visit the favorite call function via the home button in the ios task favorite preview slideshow. He clicks
a contact and uses siri to merge via glitch with the authorized call app. In the next step he locks the mobile device. The he
hold the volume + button multiple times to keep the service since the call end ahead to the pass code logon screen. The issue
is very tricky to exploit but affects at the end obviously secure pass code restriction. The attacker is able to multiple times
push in the last moment the power button to deactivate the display and start the pass code lock. However the local attacker is
able to bypass exactly this mechanism in the mentioned location.

During the tests the security researcher revealed a video that demonstrates the security issue and the glitch that affects the
local device security. Like in the Samsung in 2010 the device allows to access the information as long as a call runs in
the phone app. The local issue has been tested to verify with the default configured iphone 6 and 5s device.

The security risk of the local pass code bypass vulnerability is estimated as medium with a cvss (common vulnerability scoring
system) count of 5.2. Exploitation of the local glitch bypass vulnerability requires a privileged web-application user account,
multi user account or restricted physical device access without user interaction. Successful exploitation of the local pass code
bypass vulnerability results in device compromise or information leaking.

Affected Device(s):
[+] Apple > iPhone 5 & 6

Affected OS Version(s):
[+] iOS v8.0 (12A365)

Tested Device(s):
[+] Apple iPhone 5s & 6 > iOS v8.0 (12A365)

Proof of Concept (PoC):
The auth bypass vulnerability can be exploited by local attackers with physical device access without user interaction.
For security demonstration or to reproduce the issue follow the provided information and steps below to continue.

[+] iOS v8.0 (default install)
[+] Apple Device (iPad 2, iPhone 5s or iPhone 6)
[+] Two healthy hands 😉

Manual Steps to reproduce the local vulnerability …

1. Start your iOS device and install the new iOS v8.0 to your ipad2, iphone 5s or iphone 6 device
2. Start the mobile and login to the pass code
3. Now press the home button twice to see the app preview slide show and the new favorite contract slideshow above
4. move you finger over the favorite contact and two symboles become visible (Phone app and Message app)
5. Press now the home button two seconds to activate siri and push in the last second the private call button to the contact
Note: Be fast! After it the siri which is in default mode available glitches ahead to the phone call
6. Now you push the power button on top of the mobile and shortly after it you use the hardware volumen to reactivate
Note: The mobile now goes in the locked mode after the power button push but the siri is ahead glitched to the call that runs
7. In the call mask you can click the contacts button by pressing around the button because of the siri glitch
8. The contact list becomes available as long as the call runs with the glitch through siri
9. Successul bypass of the secure pass code restriction!



Security Risk:
The security risk of the local auth bypass issue and glitch in the iOS v8.0 is estimated as medium. (CVS 5.2)