full-disclosure - Re: Skype for Android Lockscreen Bypass

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Message-ID: <CABTg7rXn7A8RayEcqVJ3DpfGk2UCzv8bVsh1v=XfLLq_M1UNkA@mail.gmail.com>
Date: Tue, 2 Jul 2013 17:44:36 +0100
From: Pulser on XDA <pulser@...-developers.com>
To: Ryan Dewhurst <ryandewhurst@...il.com>
Cc: full-disclosure <full-disclosure@...ts.grok.org.uk>
Subject: Re: Skype for Android Lockscreen Bypass

It appears that it is in some way device or firmware dependent (when tested
on a Sony device, it happened on the Sony ROM, but not on CyanogenMod ROM).

Unfortunately I'm not sure of the criteria that make this happen, but it
seems a little difficult to reproduce right now on some devices.


On Tue, Jul 2, 2013 at 5:07 PM, Ryan Dewhurst <ryandewhurst@...il.com>wrote:

> 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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