Requesting tickets
The auxiliary/admin/kerberos/get_ticket module can be used to request TGT/TGS tickets from the KDC.
The following ACTIONS are supported:
- GET_TGT: legally request a TGT from the KDC given a password, a NT hash or an encryption key. The resulting TGT will be cached.
- GET_TGS: legally request a TGS from the KDC given a password, a NT hash, an encryption key or a cached TGT. If the TGT is not provided, it will request it the same way the “TGT action” does. The resulting TGT and the TGS will be cached.
Module usage
- Start
msfconsole - Do:
use auxiliary/admin/kerberos/get_ticket - Do:
run rhosts=<remote host> domain=<domain> username=<username> password=<password> action=GET_TGT - You should see that the TGT is correctly retrieved and stored in loot as well as the klist command
- Try with the NT hash (
NTHASHoption) and the encryption key (AES_KEYoption) instead of the password - Do:
run rhosts=<remote host> domain=<domain> username=<username> password=<password> action=GET_TGS spn=<SPN> - You should see that the module uses the TGT in the cache and does not request a new one
- You should see TGS is correctly retrieved and stored in the loot
- Do:
run rhosts=<remote host> domain=<domain> username=<username> password=<password> action=GET_TGS spn=<SPN> KrbUseCachedCredentials=false - You should see the module does not use the TGT in the cache and requests a new one
- You should see both the TGT and the TGS are correctly retrieved and stored in the loot
- Try with the NT hash (
NTHASHoption) and the encryption key (AES_KEYoption) instead of the password
Options
CERT_FILE
The PKCS12 (.pfx) certificate file to authenticate with. When this option is set, USERNAME and DOMAIN are optional and will be extracted from the certificate unless specified. Specifying a certificate causes PKINIT to be used to obtain the ticket. The module will provide a warning if USERNAME and DOMAIN are set but do not match any entries within the certificate.
CERT_PASSWORD
The certificate file’s password.
DOMAIN
The Fully Qualified Domain Name (FQDN). Ex: mydomain.local
USERNAME
The domain username to authenticate with.
PASSWORD
The user’s password to use.
NTHASH
The user’s NT hash in hex string to authenticate with. Not that the DC must support RC4 encryption.
AES_KEY
The user’s AES key to use for Kerberos authentication in hex string. Supported keys: 128 or 256 bits.
SPN
The Service Principal Name, the format is service_name/FQDN . Ex: cifs/dc01.mydomain.local. This option is only used when requesting a TGS.
IMPERSONATE
The user on whose behalf a TGS is requested (it will use S4U2Self/S4U2Proxy to request the ticket).
KrbUseCachedCredentials
If set to true, it looks for a matching TGT in the database and, if found, use it for Kerberos authentication when requesting a TGS. Note that this option only applies to GET_TGS action and has no effect on the GET_TGT action. Default is true.
Scenarios
Requesting a TGT
An example of viewing the Kerberos ticket cache, and requesting a TGT with NT hash:
msf6 auxiliary(admin/kerberos/get_ticket) > klist
Kerberos Cache
==============
No tickets
msf6 auxiliary(admin/kerberos/get_ticket) > run verbose=true rhosts=10.0.0.24 domain=mylab.local username=Administrator nthash=<redacted> action=GET_TGT
[*] Running module against 10.0.0.24
[+] 10.0.0.24:88 - Received a valid TGT-Response
[*] 10.0.0.24:88 - TGT MIT Credential Cache saved on /home/msfuser/.msf4/loot/20221104181416_default_10.0.0.24_mit.kerberos.cca_912121.bin
[*] Auxiliary module execution completed
msf6 auxiliary(admin/kerberos/get_ticket) > klist
Kerberos Cache
==============
host principal sname issued status path
---- --------- ----- ------ ------ ----
192.168.123.13 Administrator@ADF3.LOCAL krbtgt/ADF3.LOCAL@ADF3.LOCAL 2023-01-12 19:37:54 +0000 valid /Users/usr/.msf4/loot/20230112193756_default_192.168.123.13_mit.kerberos.cca_131390.bin
msf6 auxiliary(admin/kerberos/get_ticket) > hosts
Hosts
=====
address mac name os_name os_flavor os_sp purpose info comments
------- --- ---- ------- --------- ----- ------- ---- --------
10.0.0.24 Unknown device
msf6 auxiliary(admin/kerberos/get_ticket) > services
Services
========
host port proto name state info
---- ---- ----- ---- ----- ----
10.0.0.24 88 tcp kerberos open Module: auxiliary/admin/kerberos/get_ticket, KDC for domain mylab.local
TGT with encryption key
msf6 auxiliary(admin/kerberos/get_ticket) > run verbose=true rhosts=10.0.0.24 domain=mylab.local username=Administrator AES_KEY=<redacted> action=GET_TGT
[*] Running module against 10.0.0.24
[*] 10.0.0.24:88 - Getting TGT for Administrator@mylab.local
[+] 10.0.0.24:88 - Received a valid TGT-Response
[*] 10.0.0.24:88 - TGT MIT Credential Cache saved on /home/msfuser/.msf4/loot/20221104182051_default_10.0.0.24_mit.kerberos.cca_535003.bin
[*] Auxiliary module execution completed
TGT with password
msf6 auxiliary(admin/kerberos/get_ticket) > run verbose=true rhosts=10.0.0.24 domain=mylab.local username=Administrator password=<redacted> action=GET_TGT
[*] Running module against 10.0.0.24
[*] 10.0.0.24:88 - Getting TGT for Administrator@mylab.local
[+] 10.0.0.24:88 - Received a valid TGT-Response
[*] 10.0.0.24:88 - TGT MIT Credential Cache saved on /home/msfuser/.msf4/loot/20221104182219_default_10.0.0.24_mit.kerberos.cca_533360.bin
[*] Auxiliary module execution completed
TGT with certificate
msf6 auxiliary(admin/kerberos/get_ticket) > run verbose=true rhosts=10.0.0.24 cert_file=/home/msfuser/.msf4/loot/20230124155521_default_10.0.0.24_windows.ad.cs_384669.pfx action=GET_TGT
[*] Running module against 10.0.0.24
[*] 10.0.0.24:88 - Getting TGT for Administrator@mylab.local
[+] 10.0.0.24:88 - Received a valid TGT-Response
[*] 10.0.0.24:88 - TGT MIT Credential Cache ticket saved to /home/msfuser/.msf4/loot/20230124155555_default_192.168.159.10_mit.kerberos.cca_702818.bin
[*] Auxiliary module execution completed
msf6 auxiliary(admin/kerberos/get_ticket) >
Requesting a TGS
TGS with NT hash:
msf6 auxiliary(admin/kerberos/get_ticket) > run verbose=true rhosts=10.0.0.24 domain=mylab.local username=Administrator nthash=<redacted> action=GET_TGS spn=cifs/dc02.mylab.local
[*] Running module against 10.0.0.24
[+] 10.0.0.24:88 - Received a valid TGT-Response
[*] 10.0.0.24:88 - TGT MIT Credential Cache saved on /home/msfuser/.msf4/loot/20221104182601_default_10.0.0.24_mit.kerberos.cca_760650.bin
[+] 10.0.0.24:88 - Received a valid TGS-Response
[*] 10.0.0.24:88 - TGS MIT Credential Cache saved to /home/msfuser/.msf4/loot/20221104182601_default_10.0.0.24_mit.kerberos.cca_883314.bin
[*] Auxiliary module execution completed
msf6 auxiliary(admin/kerberos/get_ticket) > loot
Loot
====
host service type name content info path
---- ------- ---- ---- ------- ---- ----
10.0.0.24 mit.kerberos.ccache application/octet-stream realm: MYLAB.LOCAL, serviceName: krbtgt/mylab.local, username: administrator /home/msfuser/.msf4/loot/20221104182601_default_10.0.0.24_mit.kerberos.cca_760650.bin
10.0.0.24 mit.kerberos.ccache application/octet-stream realm: MYLAB.LOCAL, serviceName: cifs/dc02.mylab.local, username: administrator /home/msfuser/.msf4/loot/20221104182601_default_10.0.0.24_mit.kerberos.cca_883314.bin
TGS with encryption key:
msf6 auxiliary(admin/kerberos/get_ticket) > run verbose=true rhosts=10.0.0.24 domain=mylab.local username=Administrator AES_KEY=<redacted> action=GET_TGS spn=cifs/dc02.mylab.local
[*] Running module against 10.0.0.24
[+] 10.0.0.24:88 - Received a valid TGT-Response
[*] 10.0.0.24:88 - TGT MIT Credential Cache saved on /home/msfuser/.msf4/loot/20221104183040_default_10.0.0.24_mit.kerberos.cca_140502.bin
[+] 10.0.0.24:88 - Received a valid TGS-Response
[*] 10.0.0.24:88 - TGS MIT Credential Cache saved to /home/msfuser/.msf4/loot/20221104183040_default_10.0.0.24_mit.kerberos.cca_500387.bin
[*] Auxiliary module execution completed
TGS with password:
msf6 auxiliary(admin/kerberos/get_ticket) > run verbose=true rhosts=10.0.0.24 domain=mylab.local username=Administrator password=<redacted> action=GET_TGS spn=cifs/dc02.mylab.local
[*] Running module against 10.0.0.24
[+] 10.0.0.24:88 - Received a valid TGT-Response
[*] 10.0.0.24:88 - TGT MIT Credential Cache saved on /home/msfuser/.msf4/loot/20221104183244_default_10.0.0.24_mit.kerberos.cca_171694.bin
[+] 10.0.0.24:88 - Received a valid TGS-Response
[*] 10.0.0.24:88 - TGS MIT Credential Cache saved to /home/msfuser/.msf4/loot/20221104183244_default_10.0.0.24_mit.kerberos.cca_360960.bin
[*] Auxiliary module execution completed
TGS with cached TGT:
msf6 auxiliary(admin/kerberos/get_ticket) > loot
Loot
====
host service type name content info path
---- ------- ---- ---- ------- ---- ----
10.0.0.24 mit.kerberos.ccache application/octet-stream realm: MYLAB.LOCAL, serviceName: krbtgt/mylab.local, username: administrator /home/msfuser/.msf4/loot/20221104183244_default_10.0.0.24_mit.kerberos.cca_171694.bin
10.0.0.24 mit.kerberos.ccache application/octet-stream realm: MYLAB.LOCAL, serviceName: cifs/dc02.mylab.local, username: administrator /home/msfuser/.msf4/loot/20221104183244_default_10.0.0.24_mit.kerberos.cca_360960.bin
msf6 auxiliary(admin/kerberos/get_ticket) > run verbose=true rhosts=10.0.0.24 domain=mylab.local username=Administrator action=GET_TGS spn=cifs/dc02.mylab.local
[*] Running module against 10.0.0.24
[*] 10.0.0.24:88 - Using cached credential for krbtgt/mylab.local Administrator
[+] 10.0.0.24:88 - Received a valid TGS-Response
[*] 10.0.0.24:88 - TGS MIT Credential Cache saved to /home/msfuser/.msf4/loot/20221104183346_default_10.0.0.24_mit.kerberos.cca_525186.bin
[*] Auxiliary module execution completed
TGS without cached TGT:
msf6 auxiliary(admin/kerberos/get_ticket) > loot
Loot
====
host service type name content info path
---- ------- ---- ---- ------- ---- ----
10.0.0.24 mit.kerberos.ccache application/octet-stream realm: MYLAB.LOCAL, serviceName: krbtgt/mylab.local, username: administrator /home/msfuser/.msf4/loot/20221104183244_default_10.0.0.24_mit.kerberos.cca_171694.bin
10.0.0.24 mit.kerberos.ccache application/octet-stream realm: MYLAB.LOCAL, serviceName: cifs/dc02.mylab.local, username: administrator /home/msfuser/.msf4/loot/20221104183244_default_10.0.0.24_mit.kerberos.cca_360960.bin
msf6 auxiliary(admin/kerberos/get_ticket) > run verbose=true rhosts=10.0.0.24 domain=mylab.local username=Administrator action=GET_TGS spn=cifs/dc02.mylab.local KrbUseCachedCredentials=false
[*] Running module against 10.0.0.24
[-] Auxiliary aborted due to failure: unknown: Error while requesting a TGT: Kerberos Error - KDC_ERR_PREAUTH_REQUIRED (25) - Additional pre-authentication required - Check the authentication-related options (PASSWORD, NTHASH or AES_KEY)
[*] Auxiliary module execution completed
msf6 auxiliary(admin/kerberos/get_ticket) > run verbose=true rhosts=10.0.0.24 domain=mylab.local username=Administrator action=GET_TGS spn=cifs/dc02.mylab.local KrbUseCachedCredentials=false password=<redacted>
[*] Running module against 10.0.0.24
[+] 10.0.0.24:88 - Received a valid TGT-Response
[*] 10.0.0.24:88 - TGT MIT Credential Cache saved on /home/msfuser/.msf4/loot/20221104183538_default_10.0.0.24_mit.kerberos.cca_200958.bin
[+] 10.0.0.24:88 - Received a valid TGS-Response
[*] 10.0.0.24:88 - TGS MIT Credential Cache saved to /home/msfuser/.msf4/loot/20221104183538_default_10.0.0.24_mit.kerberos.cca_849639.bin
[*] Auxiliary module execution completed
msf6 auxiliary(admin/kerberos/get_ticket) > loot
Loot
====
host service type name content info path
---- ------- ---- ---- ------- ---- ----
10.0.0.24 mit.kerberos.ccache application/octet-stream realm: MYLAB.LOCAL, serviceName: krbtgt/mylab.local, username: administrator /home/msfuser/.msf4/loot/20221104183244_default_10.0.0.24_mit.kerberos.cca_171694.bin
10.0.0.24 mit.kerberos.ccache application/octet-stream realm: MYLAB.LOCAL, serviceName: cifs/dc02.mylab.local, username: administrator /home/msfuser/.msf4/loot/20221104183244_default_10.0.0.24_mit.kerberos.cca_360960.bin
10.0.0.24 mit.kerberos.ccache application/octet-stream realm: MYLAB.LOCAL, serviceName: krbtgt/mylab.local, username: administrator /home/msfuser/.msf4/loot/20221104183538_default_10.0.0.24_mit.kerberos.cca_200958.bin
10.0.0.24 mit.kerberos.ccache application/octet-stream realm: MYLAB.LOCAL, serviceName: cifs/dc02.mylab.local, username: administrator /home/msfuser/.msf4/loot/20221104183538_default_10.0.0.24_mit.kerberos.cca_849639.bin
TGS impersonating the Administrator account:
msf6 auxiliary(admin/kerberos/get_ticket) > run verbose=true rhosts=10.0.0.24 domain=mylab.local username=serviceA password=123456 action=GET_TGS spn=cifs/dc02.mylab.local impersonate=Administrator
[*] Running module against 10.0.0.24
[*] 10.0.0.24:88 - Getting TGS impersonating Administrator@mylab.local (SPN: cifs/dc02.mylab.local)
[+] 10.0.0.24:88 - Received a valid TGT-Response
[*] 10.0.0.24:88 - TGT MIT Credential Cache saved to /home/msfuser/.msf4/loot/20221201210211_default_10.0.0.24_mit.kerberos.cca_667626.bin
[+] 10.0.0.24:88 - Received a valid TGS-Response
[+] 10.0.0.24:88 - Received a valid TGS-Response
[*] 10.0.0.24:88 - TGS MIT Credential Cache saved to /home/msfuser/.msf4/loot/20221201210211_default_10.0.0.24_mit.kerberos.cca_757041.bin
[*] Auxiliary module execution completed
msf6 auxiliary(admin/kerberos/get_ticket) > loot
Loot
====
host service type name content info path
---- ------- ---- ---- ------- ---- ----
10.0.0.24 mit.kerberos.ccache application/octet-stream realm: MYLAB.LOCAL, serviceName: krbtgt/mylab.local, username: servicea /home/msfuser/.msf4/loot/20221201210211_default_10.0.0.24_mit.kerberos.cca_667626.bin
10.0.0.24 mit.kerberos.ccache application/octet-stream realm: MYLAB.LOCAL, serviceName: cifs/dc02.mylab.local, username: administrator /home/msfuser/.msf4/loot/20221201210211_default_10.0.0.24_mit.kerberos.cca_757041.bin