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Introduction about myself a student that complated university studies related to cybersecurity a CTF player learnt cybersecurity for a few years but still weak in it How I learn ethical hacking Part 0 Back then, I don’t really know about red team and blue team and I just decided to learn hacking for fun. Since hacking others looks more fun, I decided to look into videos and anything related. The first courses I go through is actually Practical Ethical Hacking from TCM Security. After going through the first few topic of the course, I have some basic understanding about how hacking works (that’s what I thought back then). Eventually, I stopped the course halfway because the course started to go through hackthebox retired machine and I don’t have a VIP account to follow along. Instead, I decided to move on with PicoCTF and Tryhackme as some of the people mentioned this 2 platform is great for learning cybersecurity. I further improved my basic skills such as linux command and getting more new knowledge from Tryhackme since it has a lot of different room. As for PicoCTF, I was stunned for quite some times as that is the first time I find out about CTF. That is also when I found out that there are a lot of different hacking. ...

Description I asked for the challenge from other people so I have no idea what the description is. All I know is this challenge required me to upload my malicious APK into the server SecureNote.apk Static Analysis I started out using jadx-gui to decompile and read the code. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 <activity android:name="com.app.rehack.MainActivity" android:exported="true"> <intent-filter> <action android:name="android.intent.action.MAIN"/> <category android:name="android.intent.category.LAUNCHER"/> </intent-filter> </activity> <activity android:name="com.app.rehack.NoteListActivity" android:exported="true"/> <activity android:name="com.app.rehack.AddNoteActivity" android:exported="true"/> <activity android:name="com.app.rehack.ViewNoteActivity" android:exported="false"/> <provider android:name="com.app.rehack.Utils.FileProvider" android:writePermission="false" android:enabled="true" android:exported="false" android:authorities="com.app.rehack" android:grantUriPermissions="true"> <meta-data android:name="android.support.FILE_PROVIDER_PATHS" android:resource="@xml/provider_path"/> </provider> Based on the AndroidManifest.xml, there’s 4 activities in total but only one activity is not exported. Aside of that, there’s a provider with grantUriPermissions="true". Based on previous challenge, this is actually vulnerable so I assume exploit path should be similar. The provider has a @xml/provider_path which provide the folder path of the file provider. ...

Description I asked for the challenge from other people so I have no idea what the description is. All I know is this challenge required me to upload my malicious APK into the server Senoparty.apk Static Analysis I started out using jadx-gui to decompile and read the code. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 <activity android:theme="@style/Theme.Senoparty" android:label="@string/app_name" android:name="com.example.senoparty.MainActivity" android:exported="true"> <intent-filter> <action android:name="android.intent.action.MAIN"/> <category android:name="android.intent.category.LAUNCHER"/> </intent-filter> <intent-filter> <action android:name="android.intent.action.VIEW"/> <category android:name="android.intent.category.BROWSABLE"/> <category android:name="android.intent.category.DEFAULT"/> <data android:scheme="content"/> <data android:scheme="file"/> </intent-filter> </activity> <provider android:name="com.example.senoparty.SenopartyProvider" android:exported="false" android:authorities="com.example.senoparty.SenopartyProvider" android:grantUriPermissions="true"> <intent-filter> <action android:name="android.intent.action.VIEW"/> <category android:name="android.intent.category.DEFAULT"/> </intent-filter> </provider> Based on the AndroidManifest.xml, there’s a MainActivity activity and a SenopartyProvider provider. I then first looked into the MainActivity. ...