module

Safari in Operator Side Effect Exploit

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Disclosed
Mar 18, 2020
Created
Oct 1, 2020

Description

This module exploits an incorrect side-effect modeling of the 'in' operator.
The DFG compiler assumes that the 'in' operator is side-effect free, however
the element with the PDF plugin provides a callback that can trigger
side-effects leading to type confusion (CVE-2020-9850).
The type confusion can be used as addrof and fakeobj primitives that then
lead to arbitrary read/write of memory. These primitives allow us to write
shellcode into a JIT region (RWX memory) containing the next stage of the
exploit.
The next stage uses CVE-2020-9856 to exploit a heap overflow in CVM Server,
and extracts a macOS application containing our payload into /var/db/CVMS.
The payload can then be opened with CVE-2020-9801, executing the payload
as a user but without sandbox restrictions.

Authors

Yonghwi Jin [email protected]
Jungwon Lim [email protected]
Insu Yun [email protected]
Taesoo Kim [email protected]
timwr

Platform

OSX,Python,Unix

Architectures

x64, python, cmd

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