module

Linux Kernel 4.6.3 Netfilter Privilege Escalation

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Disclosed
Jun 3, 2016
Created
May 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)

Authors

h00die mike@stcyrsecurity.com
vnik
Jesse Hertz
Tim Newsham

Platform

Linux

Architectures

x86, 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/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
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