back to article Finally, someone's fixed THAT Android hole. Was it your mobe network? No

A new tool attempts to close down the master-key vulnerability in Google Android that allows malicious software to masquerade as legit apps. Free utility ReKey hooks into the underlying operating system to defend fandroids who may be fretting about exactly when an official patch will arrive from their smartphone manufacturer …

COMMENTS

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  1. NorthernCoder
    Boffin

    The Android device needs to be rooted

    From www.rekey.io :

    "In order to patch the vulnerabilities on your device, ReKey requires escalated privileges. Normal unprivileged applications on stock Android devices do not possess such privileges, hence the need for a rooted device with the Superuser (or similar) application."

    1. Steve Graham

      Re: The Android device needs to be rooted

      They do say that it would be possible to use the vulnerability to patch the vulnerability (rather than via rooting) but prefer not to distribute a working example of an exploit (at the moment).

    2. JDX Gold badge

      Re: The Android device needs to be rooted

      I should hope so (needs to be rooted I mean)... I was about to make a scathing remark that "Free utility ReKey hooks into the underlying operating system" was even possible...

    3. LarsG
      Meh

      One door closes

      One door closes and another door opens.

  2. Dave Fox
    FAIL

    "but only the Samsung Galaxy S4 has been patched to protect against it"

    According to the Bluebox's security scanner, my Galaxy Note 2, Galaxy Note 8, and HTC One are also already patched!

    1. Steve Graham

      Re: "but only the Samsung Galaxy S4 has been patched to protect against it"

      According to the patch website, Bluebox scanner isn't working properly.

      1. Dave Fox

        Re: "but only the Samsung Galaxy S4 has been patched to protect against it"

        No - according to the patch website, the Bluebox scanner is failing to detect their patch in some cases, and stating that the phone is still vulnerable when it isn't. i.e. a false negative rather than a false positive.

    2. Gordon 11

      Re: "but only the Samsung Galaxy S4 has been patched to protect against it"

      My Galaxy S Advance too.

      Presumably with the Jelly Bean update it got in late early June.

    3. APA

      Re: "but only the Samsung Galaxy S4 has been patched to protect against it"

      Quick poll of Android devices in the office that are "patched":

      Sony Xperia Z

      Sony Xperia SP

      Samsung Galaxy S III

      Something's not right here. The first two are fairly new but the S3 hasn't been patched for ages. Either the statement "only the Samsung Galaxy S4 has been patched" is incorrect, or the scanner's wrong, or not all devices were vulnerable in the first place.

      1. Grant 5

        Re: "but only the Samsung Galaxy S4 has been patched to protect against it"

        Just tried the Bluebox tool on a HTC Desire S and it says unpatched, also tried on a Galaxy Note 2 which it says is patched, the Note 2 did download an update as soon as I unboxed it.

        My Galaxy S3 did actually download a small patch from Vodafone quite recently, unfortunately it's being repaired at the moment as I dropped it and am unable to test.

  3. Anonymous Coward
    Anonymous Coward

    You know the drill!

    Why are these articles always about MS? Give yourself a shake and stop using MS products....

    (It's pithier but still as stupid!!! win win!!)

  4. David Ireland
    Stop

    Please stop referring to it as 'master key'. The key is fine - there's just a hole in the door.

  5. Brenda McViking
    FAIL

    It would also appear

    that ReKey is having problems and causing some devices to enter a boot-loop. They say it's fixed in the latest version, but "non-destructive"? a boot-loop you can't get out of is a major implementation flaw, and almost as good as bricking your device.

    I'll be waiting for a few more positive reviews before I take the plunge, personally.

  6. Anonymous Coward
    Anonymous Coward

    You know what is coming next.

    Lots of fake versions of this tool posted in forums by devious buggers.

  7. Steve Graham
    Alert

    While I have no doubt that ReKey is genuine, it does request "full network access" and attempts to phone home on installation, without saying why or asking permission. Not good practice.

    1. sabroni Silver badge
      Thumb Down

      Not good practice.

      Maybe not, but very common....

    2. doctor dodongo

      @Steve Graham 12:28

      It doesn't matter what permissions it asks for. When you give it root access it can do anything it wants.

    3. ObeyThePoodle
      Holmes

      If you are rooted, which is required for ReKey, what stops you from using a firewall app like droidwall to prevent that network access?

      1. Charles 9

        The fact that it can just disable the firewall with a root shell. Even system apps are vulnerable to a root shell. That's why SU apps prompt you before they're given the OK. It's all up to you to make sure what you're allowing does what it's supposed to do because once they get the shell, it's all "caveat utilitor".

  8. Anonymous Coward
    Anonymous Coward

    vulnerable to whom? in whom can we really and honestly trust?

    as it is reported, all Android powered devices are OPEN to the world without the patch.

    can we really complain about a 'fix' that 'takes root and/or superuser privileges' in order to close the security flaw?

    which is the lesser evil, 'devious gov's, individuals, institutions, mobile phone carriers' placing malware on your device via this flaw or 'some basic trust' in a well meaning security group, that yes could be hacked themselves to produce a product or backdor?

    bit like your front door lock being broken. do you:

    a) close the door hoping no-one will try and get in?

    b) trust that the person who replaced the lock didn't sell a spare key to one of his mates?

    1. Anonymous Coward
      Anonymous Coward

      Re: vulnerable to whom? in whom can we really and honestly trust?

      I think you're miss understanding. The front door isn't open as you must first install a dodgy application for it to gain access to your system. This is more akin to your safe door being open and you then opening your front door and inviting a burglar in.

  9. Tony W

    Who do you believe?

    Bluebox scanner says my Galaxy S2 is patched, but I find this very unlikely.

    1. Dave Fox
      Go

      Re: Who do you believe?

      Try installing the proof of concept APK on the ReKey website via ADB.

      I tried on my devices which the Bluebox security scanners reports as patched and it failed - which is the correct behaviour for a patched device.

  10. Andy Nugent

    Genuine question

    Have I misunderstood this vulnerability or is it:

    - Hacker could take Facebook/Twitter/etc. APK.

    - Add malicious code into it.

    - Distribute the app (via 3rd party sites unless they have access to the companies Google Play login) and it would be installed as a valid update to your already installed Facebook/Twitter/etc. apps.

    But if you could get people to install your app from a non-Google Play source, couldn't you just as easily have them install any app that's labelled as Facebook/Twitter/etc. and just have the app open a web view or crash on startup (once you've done whatever you wanted to)?

    So what's the real vulnerability to end users? Not suggesting it shouldn't be fixed, but how does this make it easier to infect a phone?

  11. phuzz Silver badge

    Finally? Cyanogenmod fixed it last week:

    https://github.com/CyanogenMod/android_libcore/commit/f96064dfa4191cf58a7d96326002fc6e3423a123

  12. Dick Emery

    Do not get this app

    Go get the Bluebox Security App which will tell you if your Android OS passes the test. ReKey gets it wrong and supposedly will patch a flaw that is already patched in 4.2.2

  13. Daverk
    Alert

    Not all of us want to root our devices due to warranty issues! So are we left stranded?

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