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fs0c131y's profile
Elliot Alderson
Elliot Alderson
Elliot Alderson
@fs0c131y

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Elliot Alderson

@fs0c131y

French security researcher. Worst nightmare of Oneplus, Wiko, UIDAI, Kimbho and others. Not completely schizophrenic. Not related to USANetwork. DMs open.

Joined June 2015

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    1. Elliot Alderson‏ @fs0c131y 22 Dec 2017

      <Thread> Hi @ARCHOS 👋! Let's discuss a backdoor found in the EngineerMode app on the @ARCHOS 40 Power phonepic.twitter.com/RY5Yxw02zL

      4 replies 42 retweets 58 likes
      Show this thread
    2. Elliot Alderson‏ @fs0c131y 22 Dec 2017

      You can open the EngineerMode app like this: 1. Open Dialer app 2. Dial *#*#83781#*#* If you swipe to the "HARDWARETEST" section, you will find the item "root check". Sounds like something interesting, no?pic.twitter.com/QWxdDbmbMO

      1 reply 3 retweets 5 likes
      Show this thread
    3. Elliot Alderson‏ @fs0c131y 22 Dec 2017

      This item is set to "rooted" if the method get_rootflag returns 1. This method is a native method defined in the jni_engineermode lib.pic.twitter.com/wcTpspt2W5

      1 reply 1 retweet 2 likes
      Show this thread
    4. Elliot Alderson‏ @fs0c131y 22 Dec 2017

      In the strings of libjni_engineermode.so we can find: - /data/misc/rootrecorder - [root_recorder] magic=%d\n - [root_recorder] rootflag=%d\n - [root_recorder] sprd magic verify pass.\n - [root_recorder] sprd magic verify failed.\npic.twitter.com/YlrgCMYykn

      1 reply 1 retweet 3 likes
      Show this thread
    5. Elliot Alderson‏ @fs0c131y 22 Dec 2017

      By disassembling the method get_rootflag we can see the following flow: 1) Open and read /data/misc/rootrecorder 2) Compare the value with 'ROOT' 3) Returns 1 if equals, otherwise 0pic.twitter.com/IhsyqA9g7R

      2 replies 1 retweet 4 likes
      Show this thread
    6. Elliot Alderson‏ @fs0c131y 22 Dec 2017

      As I didn't root my device yet, I can't write to /data/misc/rootrecorder 😢. Moreover, I didn't find any use of this backdoor in the limited part of the firmware I have. I will continue to dig 😈

      1 reply 1 retweet 4 likes
      Show this thread
      Elliot Alderson‏ @fs0c131y 22 Dec 2017

      Anyway, it's very funny to see that the angela backdoor implemented by @oneplus was not an isolated incident, @ARCHOS and OEMs in general used to implemented this kind of backdoor for 🤦‍♂️debug purposes🤦‍♂️

      1:09 AM - 22 Dec 2017
      • 7 Retweets
      • 18 Likes
      • KP Roberto W Larus Ben Filip Eliáš🌐 ░░░░░░░░░░░░░░░ Jeffffffffffffffff ░░░░░░░░░░░░░░░ Maidunda Stefan Djokić volvery
      4 replies 7 retweets 18 likes
        1. New conversation
        2. Elliot Alderson‏ @fs0c131y 22 Dec 2017

          cc @AndroidAuth @AndroidPolice @androidcentral @androidandme @Androidheadline @xdadevelopers @AndroidSPIN @TheHackersNews @verge @CNET @VICE @WIRED @JAMESWT_MHT @malwrhunterteam @hackerfantastic @LukasStefanko @ANDROIDPIT @FigaroTech @virqdroid @twandroid

          1 reply 0 retweets 11 likes
          Show this thread
        3. Elliot Alderson‏ @fs0c131y 22 Dec 2017

          @reporteric @OmarBelkaab @OtaXou @gkallenborn @LucieRonfaut @LucieRonfaut @MishaalRahman @Numerama @bviglia @SriramVSharma @zpring @stshank @campuscodi @lilyhnewman

          0 replies 1 retweet 6 likes
          Show this thread
        4. End of conversation
        1. New conversation
        2. Mishaal Rahman‏ @MishaalRahman 22 Dec 2017
          Replying to @fs0c131y @oneplus @ARCHOS

          How exactly is this a backdoor then?

          1 reply 0 retweets 0 likes
        3. Elliot Alderson‏ @fs0c131y 22 Dec 2017
          Replying to @MishaalRahman @oneplus @ARCHOS

          There 2 possibilities: - Set this flag will root the device - This flag is set after a root procedure As my device is not rooted, I cannot test it for now. Anyway, it's clearly shows that a root procedure had been implemented by @ARCHOS without the knowledge of the user

          1 reply 0 retweets 0 likes
        4. Mishaal Rahman‏ @MishaalRahman 22 Dec 2017
          Replying to @fs0c131y @oneplus @ARCHOS

          You shouldn't call it a backdoor if you haven't tested that. Plus if it already needs root to write to /data, then so what? That process already has root so what would be the importance of this?

          1 reply 0 retweets 0 likes
        5. Elliot Alderson‏ @fs0c131y 22 Dec 2017
          Replying to @MishaalRahman @oneplus @ARCHOS

          A root procedure implemented by the phone maker without the knowledge of the user is a backdoor... Not sure you really understand the thing here. As said in the tweet this is a partial result but it clearly shows that @ARCHOS has a way to root the device.

          2 replies 0 retweets 0 likes
        6. Elliot Alderson‏ @fs0c131y 22 Dec 2017
          Replying to @fs0c131y @MishaalRahman and

          The main hypothesis here is that this flag is set by another @ARCHOS system app. I will continue to dig to find how to trigger this procedure

          1 reply 0 retweets 0 likes
        7. Moyster‏ @oysterized 22 Dec 2017
          Replying to @fs0c131y @MishaalRahman and

          Time to say a prayer for all those all-winner devices running that "rootmydevice" piece of code : https://github.com/allwinner-zh/linux-3.4-sunxi/commit/e8bb679bbb18b90174381bea0e643eb81a92030b … 😂

          0 replies 0 retweets 0 likes
        8. End of conversation
        1. NodePoint‏ @CoolApps45 22 Dec 2017
          Replying to @fs0c131y @oneplus @ARCHOS

          They couldn't just use debugging builds? smh

          0 replies 0 retweets 0 likes
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        1. Hackbert‏ @squeakybumtime_ 22 Dec 2017
          Replying to @fs0c131y @malwrhunterteam and

          Debugpic.twitter.com/ntUMTwlybS

          0 replies 0 retweets 0 likes
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