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AF_PACKET chocobo_root Privilege Escalation

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AF_PACKET chocobo_root Privilege Escalation

Disclosed
08/12/2016
Created
06/14/2018

Description

This module exploits a race condition and use-after-free in the packet_set_ring function in net/packet/af_packet.c (AF_PACKET) in the Linux kernel to execute code as root (CVE-2016-8655). The bug was initially introduced in 2011 and patched in 2016 in version 4.4.0-53.74, potentially affecting a large number of kernels; however this exploit targets only systems using Ubuntu (Trusty / Xenial) kernels 4.4.0 < 4.4.0-53, including Linux distros based on Ubuntu, such as Linux Mint. The target system must have unprivileged user namespaces enabled, two or more CPU cores, and SMAP must be disabled. Bypasses for SMEP and KASLR are included. Failed exploitation may crash the kernel. This module has been tested successfully on Linux Mint 17.3 (x86_64); Linux Mint 18 (x86_64); Ubuntu 16.04 (x86_64); and Ubuntu 16.04.2 (x86_64).

Author(s)

  • rebel
  • bcoles <bcoles@gmail.com>

Platform

Linux

Architectures

x86, x64

Development

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/linux/local/af_packet_chocobo_root_priv_esc
msf exploit(af_packet_chocobo_root_priv_esc) > show targets
    ...targets...
msf exploit(af_packet_chocobo_root_priv_esc) > set TARGET < target-id >
msf exploit(af_packet_chocobo_root_priv_esc) > show options
    ...show and set options...
msf exploit(af_packet_chocobo_root_priv_esc) > exploit

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