Master Key multi-fix

Master Key multi-fix 2 for Android

A Free Tools App

Published By Tungstwenty

Master Key multi-fix (tungstwenty.xposed.masterkeydualfix): Requires the Xposed Framework. Grab it at and make sure it runs properly on your device.ROOT ... Read More > or Download Now >

Master Key multi-fix for Android

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29.25 KB

Google Play

Tech Specs

  • • Latest Version: 2
  • • Updated: November 6, 2013
  • • Requires: Android 2.3.3 and up
  • • Developer: Tungstwenty
  • • Content Rating: Unrated

User Reviews

  • 754 Votes, Average: 4.5 out of 5
  • • Rating Average
  • 4.5 out of 5
  • • Rating Users
  • 754

Download Count

  • • Total Downloads
  • 2123
  • • Current Version Downloads
  • 1822
  • • File Name: tungstwenty.xposed.masterkeydualfix.apk

You can now download the latest version apk file and install it.

More About Master Key multi-fix App

Master Key multi-fix Screenshot Image

Master Key multi-fix Description: Requires the Xposed Framework. Grab it at and make sure it runs properly on your device.
ROOT only required for installing the Xposed Framework, it can be dropped afterwards.

This app patches several vulnerability issues found on Android collectively known as 'Master Key' exploits:
- bug 8219321
- bug 9695860
- bug 9950697

In general terms, these allow exploiting signed APKs by replacing the code they contain while maintaining the existing signature valid (hence the term 'Master Key'), leading you to think the original author is someone you trust.
The original Android sources have been corrected to fix these problems, but it might take a while
till stock ROMs include the fixes, if ever.

To check if you're vulnerable, you can use other apps available on the store such as SRT AppScanner ( or Bluebox Security Scanner (
Note: If using Bluebox Security Scanner, make sure to force a refresh on the app once the fix is applied, otherwise you might get a cached and incorrect result.

For any questions or to support my work, please visit

What's New in Master Key multi-fix 2 >

2.0 Fix bug 9950697; additional corrections taken from Android 4.4
1.3 Fixed problems with parsing some zips depending on the rom original code
1.2 Added 2 additional zip entry integrity checks that were missing
1.1 Support for additional devices with modified core libraries (e.g. MTK6589)

Download Master Key multi-fix 2 APK File

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