modules/auxiliary/fuzzers/ssh/ssh_kexinit_corrupt.rb
##
# 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::Fuzzer
def initialize(info = {})
super(update_info(info,
'Name' => 'SSH Key Exchange Init Corruption',
'Description' => %q{
This module sends a series of SSH requests with a corrupted initial key exchange payload.
},
'Author' => [ 'hdm' ],
'License' => MSF_LICENSE
))
register_options([
Opt::RPORT(22),
OptInt.new('MAXDEPTH', [false, 'Specify a maximum byte depth to test'])
])
end
def do_ssh_kexinit(pkt,opts={})
@connected = false
connect
@connected = true
@banner = sock.get_once(-1,opts[:banner_timeout])
return if not @banner
sock.put("SSH-2.0-OpenSSH_5.1p1 Debian-5ubuntu1\r\n")
sock.put(pkt)
sock.get_once(-1,opts[:kex_timeout])
end
def run
last_str = nil
last_inp = nil
last_err = nil
pkt = make_kex_init
cnt = 0
max = datastore['MAXDEPTH'].to_i
max = nil if max == 0
tot = ( max ? [max,pkt.length].min : pkt.length) * 256
print_status("Fuzzing SSH initial key exchange with #{tot} requests")
fuzz_string_corrupt_byte_reverse(pkt,max) do |str|
cnt += 1
if(cnt % 100 == 0)
print_status("Fuzzing with iteration #{cnt}/#{tot} using #{@last_fuzzer_input}")
end
begin
r = do_ssh_kexinit(str,:banner_timeout => 5, :kex_timeout => 0.5)
rescue ::Interrupt
print_status("Exiting on interrupt: iteration #{cnt} using #{@last_fuzzer_input}")
raise $!
rescue ::Exception => e
last_err = e
ensure
disconnect
end
if(not @connected)
if(last_str)
print_status("The service may have crashed: iteration:#{cnt-1} method=#{last_inp} string=#{last_str.unpack("H*")[0]} error=#{last_err}")
else
print_status("Could not connect to the service: #{last_err}")
end
return
end
if(not @banner)
print_status("The service may have crashed (no banner): iteration:#{cnt-1} method=#{last_inp} string=#{last_str.to_s.unpack("H*")[0]} ")
return
end
last_str = str
last_inp = @last_fuzzer_input
end
end
def make_kex_init
[0x00, 0x00, 0x03, 0x14, 0x08, 0x14, 0xff, 0x9f,
0xde, 0x5d, 0x5f, 0xb3, 0x07, 0x8f, 0x49, 0xa7,
0x79, 0x6a, 0x03, 0x3d, 0xaf, 0x55, 0x00, 0x00,
0x00, 0x7e, 0x64, 0x69, 0x66, 0x66, 0x69, 0x65,
0x2d, 0x68, 0x65, 0x6c, 0x6c, 0x6d, 0x61, 0x6e,
0x2d, 0x67, 0x72, 0x6f, 0x75, 0x70, 0x2d, 0x65,
0x78, 0x63, 0x68, 0x61, 0x6e, 0x67, 0x65, 0x2d,
0x73, 0x68, 0x61, 0x32, 0x35, 0x36, 0x2c, 0x64,
0x69, 0x66, 0x66, 0x69, 0x65, 0x2d, 0x68, 0x65,
0x6c, 0x6c, 0x6d, 0x61, 0x6e, 0x2d, 0x67, 0x72,
0x6f, 0x75, 0x70, 0x2d, 0x65, 0x78, 0x63, 0x68,
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0x31, 0x2c, 0x64, 0x69, 0x66, 0x66, 0x69, 0x65,
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end
end