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).
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_escmsf undefined(sysret_priv_esc) > show actions ...actions...msf undefined(sysret_priv_esc) > set ACTION < action-name >msf undefined(sysret_priv_esc) > show options ...show and set options...msf undefined(sysret_priv_esc) > runPrioritise with Active Threat Intelligence
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub