Security Flaw Bypasses IPhone Lock Screen

It looks like the iPhone lock screen provides just a marginal level of protection. [Jordand321] discovered a key combination that opens the contact app on a locked iPhone. Just tap the emergency call button, enter the pound sign three times (###), then tap call and immediately tap the lock key on the top of the phone. If this is confusing just look at the video after the break to see how it’s done.

You don’t get access to everything on the device. But this does give an attacker access to all of your contact data and allows that person to make any calls they desire.


[via Wired via 9to5Mac]

53 thoughts on “Security Flaw Bypasses IPhone Lock Screen

  1. I’m not sure that i catch your drift ACIDRAIN… What has their philosophy to do with this bug? I’m sorry but i’ve seen worse bugs in some of the old Android releases and i’m sure there is bugs even in Froyo.. To me your post only seem like a flamewar-starter.

    Note: I myself is an Android user, and i dont exactly like Apple’s philosophy, but your post seems to be pretty useless.

  2. To be fair, glitches like this can happen no matter who is writing the software, and the issue will certainly be fixed soon. I don’t support many of Apple’s business practices either, but that has nothing to do with this.

    Android 2.0.1 had a glitch wherein the lock screen could be bypassed simply by calling the phone in question and hitting the Back button.

  3. @Bilbao Bob: “All smartphones have a maintenance bypass.”

    How on earth is a “maintenance bypass” on a lock screen a feature? Then what is the use of the lock screen in the first place…? No, this is a Bad Thing.

  4. You can also access people’s photo library and take pictures if you edit a contact. Thankfully, it doesn’t look like you can take them off the phone.

    As always, physical security is paramount regardless of the technology.

  5. Definitely works on mine. (ip4 jailbroken 4.2) You can also activate the voice control once ‘breaking into’ the dial pad by holding the home button. From there i was able to play music as well as make calls.

  6. This bug is much like the Win 98 login bypass by going to Help -> Print Help, etc. I hate Apple and all, but honestly, this crap happens. You program something with as much text as the bible, and have dozens of authors, there’s going to be mistakes. (I’m sure there’s a corollary in there somewhere…)

  7. Any number works, not just 3 #s. Also, you can send email, send texts, and browse photos. All from the contacts list. Pretty powerful stuff. If you’re wondering how you can send a text, try sending a contact.

  8. Same as how I used to bypass windows XP activation screen. It’s just a bug and really not a big one, if someone steals your iPhone, they can use a PC to get through your password screen. (ie recovery mode -> iPHUC -> remove “/mnt/mobile/Library/Preferences/”)

    Physical access trumps all.

  9. @Pilotgeek: “So? On my Android, pulling the battery and turning it back on bypasses the lock screen.”

    Really? It doesn’t on mine – if I reboot it, it still asks for the passcode (well, joiny-dot combination) when I turn it back on, before it will let me do anything on the phone. And I have to put the PIN code in again when I do that.

    @Itwork4me: “…since your phones JBd…”

    They guy specifically says in the video that he has tested it on non-JBd devices as well.

    @MS3FGX: “…glitches like this can happen no matter who is writing…”

    I totally agree with you. I am worried that the locking feature can somehow fall back to the default caller app though – seems like they haven’t isolated the locking feature from the rest of the OS properly, in my eyes. Meh. It’s not like the other mobile OS’s haven’t had similar problems in the past (and probably will in the future).

  10. It could be feature added for medical purposes. To allow ER staff to gain access to ICE (In Case of Emergency) phone numbers. I am sure that there is a graph somewhere showing the direct correlation between rate of hospitalization and iDiots.

  11. It is like locking down menus on windows98 and you can still hack yourself a cmd shell :)

    Personally I never lock my phones because it’s only me whose gonna get annoyed from it. Who would use it anyway? If someone would steal it they could get around that lock anyways.

  12. Im Surprised apple hasnt come back saying “your typing it wrong!”

    but in fairness bugs exsist across platforms, but its how the company deals with it, when apple makes up stuff to cover it up is where i draw the line

  13. I can bypass the lock screen of my iPhone 4 by simply holding the home button until voice control pops up. From voice control I can call people and play music. 4.1 iOS not jailbroken. The posted method above works for me as well.

  14. I just stumbled on this post… just wanted to point out that if you use the “Android Lock XT” app off Cydia, it removes the emergency call option from your lockscreen, and pretty much renders that glitch a non-issue. I just hope you don’t need to call 911 quick. haha.

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