BlueStacks privilege escalation through VM backdooring
by Loki - Saturday July 27, 2024 at 05:44 PM
#1
BlueStacks is an Android emulator which runs the guest Android system within a virtual machine. 
Because BlueStacks stores virtual machine configuration files in a world-writeable directory and shares them across different OS users, it is possible for an unprivileged user to backdoor an image that would then gain code execution capabilities of a privileged user.

Reproduction

  1. Set up attacker and victim accounts, preferably making attacker unprivileged and victim the administrator
  2. Victim: install the vulnerbale version of BlueStacks
  3. Attacker: modify Nougat32.bstk to give Android access to C drive
  4. Attacker: run the Android system and install a malicious application on it
  5. Victim: run BlueStacks, causing the malicious application to drop payload in your startup directory
  6. Victim: reboot the machine and log into your account again
  7. Startup payload should be executed with your privileges

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Omnicer
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#2
Thank you bro for this PoC.

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