full-disclosure - Re: Skype for Android Lockscreen Bypass

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Date: Tue, 2 Jul 2013 18:07:45 +0200
From: Ryan Dewhurst <ryandewhurst@...il.com>
To: Pulser on XDA <pulser@...-developers.com>
Cc: full-disclosure <full-disclosure@...ts.grok.org.uk>
Subject: Re: Skype for Android Lockscreen Bypass

Just a FYI.

Have not been able to reproduce on:

Galaxy Tab 2 10"
Android 4.1.2
Skype 3.2.0.6673 (same as listed above)
Screen Lock: Secured with pattern


On Mon, Jul 1, 2013 at 10:46 PM, Pulser on XDA <pulser@...-developers.com>wrote:

> Tested with Skype version 3.2.0.6673 (released 1st July 2013) on various
> Android devices (Sony Xperia Z, Samsung Galaxy Note 2, Huawei Premia 4G
>
> The Skype for Android application appears to have a bug which permits the
> Android inbuilt lockscreen (ie. pattern, PIN, password) to be bypassed
> relatively easily, if the device is logged into Skype, and the "attacker"
> is able to call the "victim" on Skype.
>
> This can be reproduced as follows with 2 Skype accounts, and 2 separate
> devices to use with Skype. The target phone is presumed to have an Android
> lockscreen configured and in use, and to be locked during the test.
>
>    1. Initiate a Skype call to the target device, which will cause it to
>    wake, ring, and display a prompt on the screen to answer or reject the call
>    2. Accept the call from the target device using the green answer
>    button on the screen
>    3. End the call from the initiating device (ie. the device used to
>    call the target phone)
>    4. The target device will end the call, and should display the
>    lockscreen.
>    5. Turn off the screen of the target device using the power key, and
>    turn it on again
>    6. The lockscreen will now be bypassed. It will remain bypassed until
>    the device is rebooted
>
> Similar to (ironically enough):
> http://arstechnica.com/security/2013/04/crital-app-flaw-bypasses-screen-lock-on-up-to-100-million-android-phones/.
> Seems that internet based calling apps might well be "unlucky".
>
> Thanks to Emilio López for originally bringing this to my attention
>
>
>
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