module

Android Binder Use-After-Free Exploit

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Disclosed
2019-09-26
Created
2020-02-23

Description

This module exploits CVE-2019-2215, which is a use-after-free in Binder in the
Android kernel. The bug is a local privilege escalation vulnerability that
allows for a full compromise of a vulnerable device. If chained with a browser
renderer exploit, this bug could fully compromise a device through a malicious
website.
The freed memory is replaced with an iovec structure in order to leak a pointer
to the task_struct. Finally the bug is triggered again in order to overwrite
the addr_limit, making all memory (including kernel memory) accessible as part
of the user-space memory range in our process and allowing arbitrary reading
and writing of kernel memory.

Authors

Jann Horn
Maddie Stone
grant-h
timwr

Platform

Android,Linux

Architectures

aarch64

References

Module Options

To display the available options, load the module within the Metasploit console and run the commands ‘show options’ or ‘show advanced’:


    msf > use exploit/android/local/binder_uaf
    msf exploit(binder_uaf) > show targets
        ...targets...
    msf exploit(binder_uaf) > set TARGET < target-id >
    msf exploit(binder_uaf) > show options
        ...show and set options...
    msf exploit(binder_uaf) > exploit
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