module

Chrome 72.0.3626.119 FileReader UaF exploit for Windows 7 x86

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Disclosed
2019-03-21
Created
2019-05-08

Description

This exploit takes advantage of a use after free vulnerability in Google
Chrome 72.0.3626.119 running on Windows 7 x86.
The FileReader.readAsArrayBuffer function can return multiple references to the
same ArrayBuffer object, which can be freed and overwritten with sprayed objects.
The dangling ArrayBuffer reference can be used to access the sprayed objects,
allowing arbitrary memory access from Javascript. This is used to write and
execute shellcode in a WebAssembly object.
The shellcode is executed within the Chrome sandbox, so you must explicitly
disable the sandbox for the payload to be successful.

Authors

Clement Lecigne
István Kurucsai
timwr

Platform

Windows

Architectures

x86

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/windows/browser/chrome_filereader_uaf
    msf exploit(chrome_filereader_uaf) > show targets
        ...targets...
    msf exploit(chrome_filereader_uaf) > set TARGET < target-id >
    msf exploit(chrome_filereader_uaf) > show options
        ...show and set options...
    msf exploit(chrome_filereader_uaf) > exploit
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