module

FreeBSD Intel SYSRET Privilege Escalation

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

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 Wojtczuk
John Baldwin
iZsh
bcoles bcoles@gmail.com

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 exploit(intel_sysret_priv_esc) > show targets
        ...targets...
    msf exploit(intel_sysret_priv_esc) > set TARGET < target-id >
    msf exploit(intel_sysret_priv_esc) > show options
        ...show and set options...
    msf exploit(intel_sysret_priv_esc) > exploit
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