module

FreeBSD Intel SYSRET Privilege Escalation

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Disclosed
06/12/2012
Created
03/19/2019

Description

This module exploits a vulnerability in the FreeBSD kernel,
when running on 64-bit Intel processors.

By design, 64-bit processors following the X86-64 specification will
trigger a general protection fault (GPF) when executing a SYSRET
instruction with a non-canonical address in the RCX register.

However, Intel processors check for a non-canonical address prior to
dropping privileges, causing a GPF in privileged mode. As a result,
the current userland RSP stack pointer is restored and executed,
resulting in privileged code execution.

This module has been tested successfully on:

FreeBSD 8.3-RELEASE (amd64); and
FreeBSD 9.0-RELEASE (amd64).

Authors

Rafal WojtczukJohn BaldwiniZshbcoles

Platform

BSD

Architectures

x64

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/freebsd/local/intel_sysret_priv_esc
    msf /(c) > show actions
        ...actions...
    msf /(c) > set ACTION < action-name >
    msf /(c) > show options
        ...show and set options...
    msf /(c) > run
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