Rapid7 Vulnerability & Exploit Database

Linux Kernel 4.6.3 Netfilter Privilege Escalation

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Linux Kernel 4.6.3 Netfilter Privilege Escalation

Disclosed
06/03/2016
Created
05/30/2018

Description

This module attempts to exploit a netfilter bug on Linux Kernels before 4.6.3, and currently only works against Ubuntu 16.04 (not 16.04.1) with kernel 4.4.0-21-generic. Several conditions have to be met for successful exploitation: Ubuntu: 1. ip_tables.ko (ubuntu), iptable_raw (fedora) has to be loaded (root running iptables -L will do such) 2. libc6-dev-i386 (ubuntu), glibc-devel.i686 & libgcc.i686 (fedora) needs to be installed to compile Kernel 4.4.0-31-generic and newer are not vulnerable. This exploit does not bypass SMEP/SMAP. We write the ascii files and compile on target instead of locally since metasm bombs for not having cdefs.h (even if locally installed)

Author(s)

  • h00die <mike@stcyrsecurity.com>
  • vnik
  • Jesse Hertz
  • Tim Newsham

Platform

Linux

Architectures

x86, x64

Development

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/linux/local/netfilter_priv_esc_ipv4
msf exploit(netfilter_priv_esc_ipv4) > show targets
    ...targets...
msf exploit(netfilter_priv_esc_ipv4) > set TARGET < target-id >
msf exploit(netfilter_priv_esc_ipv4) > show options
    ...show and set options...
msf exploit(netfilter_priv_esc_ipv4) > exploit

Time is precious, so I don’t want to do something manually that I can automate. Leveraging the Metasploit Framework when automating any task keeps us from having to re-create the wheel as we can use the existing libraries and focus our efforts where it matters.

– Jim O’Gorman | President, Offensive Security

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