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wdormann's profile
Will Dormann
Will Dormann
Will Dormann
@wdormann

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Will Dormann

@wdormann

Vulnerability Analyst at the CERT/CC. My thoughts are my own, not my employer's.

Joined August 2012

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    1. Daniel Isaksen‏ @duniel_pls 7 Feb 2019
      • Report Tweet
      • Report NetzDG Violation

      `apktool' will create the `com.vendor.package' directory in your current directory. When you've done this, open the `com.vendor.package-dex2jar.jar' file d2j generated in the `jd-gui' program - it's a Java decompiler. (5/?)

      2 replies 0 retweets 20 likes
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    2. Daniel Isaksen‏ @duniel_pls 7 Feb 2019
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      • Report NetzDG Violation

      With `jd-gui' purring nicely, hit Ctrl+Shift+S, check all the "Search For" boxes, and search for "PKCS12". It *should* come up with `NetworkManager.class', double click it and it'll take you to the matching code. (6/?)

      2 replies 0 retweets 19 likes
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    3. Daniel Isaksen‏ @duniel_pls 7 Feb 2019
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      You should either find the password in cleartext in a string nearby, or something like `paramContext.getString(2131492865);`. If you come across the number, open `R.class', Ctrl+F for it, and copy the variable identifier. (7/?)

      1 reply 0 retweets 21 likes
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    4. Daniel Isaksen‏ @duniel_pls 7 Feb 2019
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      Then look for it in the apktool directory, in `com.vendor.package/res/values/strings.xml' - the password should be there, in plaintext. (8/?)

      1 reply 0 retweets 18 likes
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    5. Daniel Isaksen‏ @duniel_pls 7 Feb 2019
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      Anyway, once you have the password, move to `com.vendor.package/assets', find the `.p12' files, and run `keytool -list -v -keystore <KEYSTORE_FILE> -storetype PKCS12 -storepass "<PASSWORD_HERE>"'. It'll spit out a bunch of data, including an encrypted RSA key at the top. (9/?)

      2 replies 0 retweets 21 likes
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    6. Daniel Isaksen‏ @duniel_pls 7 Feb 2019
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      Copy that key (with the header and footer) to a separate file, name it something like "thedomain.tld.key.enc", and run `openssl rsa -in domain.tld.key.enc -out domain.tld.key'. The password should be the same, and you'll have the decrypted key. (10/11)

      1 reply 1 retweet 21 likes
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    7. Daniel Isaksen‏ @duniel_pls 7 Feb 2019
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      Once you have the RSA private key, you could do something funky, like MitM-attacks or impersonating the server. Or whatever your heart desires! I suspect these keys are used for backend communications, as the crypto. fingerprints differ from the ones on the websites. (11/11)

      1 reply 0 retweets 30 likes
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    8. Daniel Isaksen‏ @duniel_pls 7 Feb 2019
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      POST SCRIPTUM: These apps were publicly released by Atrient, and with them, the casinos' private RSA keys. The decryption passwords were also shockingly easy to find, and to make matters worse, it turns out most of the certificates are wildcard DV certs.pic.twitter.com/xkEHPDUwYd

      5 replies 30 retweets 141 likes
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    9. Will Dormann‏ @wdormann 7 Feb 2019
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      Replying to @duniel_pls

      Hm, I only have two of their apps in my pile of Android apps that distribute private keys. I wonder if it's only some of the apps that make this mistake? Or if my methodology is flawed in some way? But yeah. Private key for a wildcard domain. I notified these authors a year ago.pic.twitter.com/EbpWmjTB93

      1 reply 2 retweets 10 likes
    10. Daniel Isaksen‏ @duniel_pls 7 Feb 2019
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      Replying to @wdormann

      Yeah, I've come across a surprising amount of Android app with secrets inside them. Here are four of the Atrient app identifiers, I was unable to find all of them on Google Play: com.atrient.aviresort com.atrient.treasurebaycasino http://com.gr .casinos com.myddwv

      2 replies 5 retweets 8 likes
      Will Dormann‏ @wdormann 7 Feb 2019
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      Replying to @duniel_pls

      Got it. Sounds like you may have been doing some work similar to what I did! My framework found the three of those that are in the Google Play store. If you're at all interested in my summary presentation, check out: https://resources.sei.cmu.edu/library/asset-view.cfm?assetID=517768 …

      8:09 PM - 7 Feb 2019
      0 replies 0 retweets 0 likes

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