67 lines
1.5 KiB
Ruby
67 lines
1.5 KiB
Ruby
require 'rex/exploitation/seh'
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module Msf
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###
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#
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# Seh
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# ---
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#
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# This mixin provides a interface to generating SEH registration records in a
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# robust fashion using the Rex::Exploitation::Seh class.
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#
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###
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module Exploit::Seh
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def initialize(info = {})
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super
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# Register an advanced option that allows users to specify whether or
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# not a dynamic SEH record should be used.
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register_advanced_options(
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[
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OptBool.new('DynamicSehRecord', [ false, "Generate a dynamic SEH record (more stealthy)", 'no' ])
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], Msf::Exploit::Seh)
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end
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#
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# Generates an SEH record with zero or more options. The supported options
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# are:
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#
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# EvasionLevel
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#
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# The evasion level to use. If none is supplied, the default is used.
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#
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# NopGenerator
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#
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# The NOP generator instance to use, if any.
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#
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# Space
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#
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# The amount of room the SEH record generator has to play with for
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# random padding. This should be derived from the maximum amount of
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# space available to the exploit for payloads minus the current payload
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# size.
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#
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def generate_seh_record(handler, opts = {})
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seh = Rex::Exploitation::Seh.new(
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payload_badchars,
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opts['Space'],
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opts['NopGenerator'])
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evlvl = opts['EvasionLevel'] || seh.default_evasion_level
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# If the user specified that a dynamic SEH record be used, override all
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# of the supplied settings.
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if (datastore['DynamicSehRecord'])
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evlvl = EVASION_HIGH
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end
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# Generate the record
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seh.generate_seh_record(handler, evlvl)
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end
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end
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end
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