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Hack The Box: Active

Active - 10.10.10.100

@jdksec

Target enumeration:

OS: Windows

IP: 10.10.10.100

User: 86d67d8ba232bb6a254aa4d10159e983

Root: b5fc76d1d6b91d77b2fbf2d54d0f708b

Ports / Services / Software versions running

53/tcp    open domain        Microsoft DNS 6.1.7601 (1DB15D39) (Windows Server 2008 R2 SP1)

88/tcp    open kerberos-sec  Microsoft Windows Kerberos (server time: 2018-12-17 17:16:59Z)

135/tcp   open msrpc         Microsoft Windows RPC

139/tcp   open netbios-ssn   Microsoft Windows netbios-ssn

389/tcp   open ldap          Microsoft Windows Active Directory LDAP (Domain: active.htb, Site: Default-First-Site-Name)

445/tcp   open microsoft-ds?

464/tcp   open kpasswd5?

593/tcp   open ncacn_http    Microsoft Windows RPC over HTTP 1.0

636/tcp   open tcpwrapped

3268/tcp  open ldap          Microsoft Windows Active Directory LDAP (Domain: active.htb, Site: Default-First-Site-Name)

3269/tcp  open tcpwrapped

5722/tcp  open msrpc         Microsoft Windows RPC

9389/tcp  open mc-nmf        .NET Message Framing

47001/tcp open  http Microsoft HTTPAPI httpd 2.0 (SSDP/UPnP)

49152/tcp open  msrpc Microsoft Windows RPC

49153/tcp open  msrpc Microsoft Windows RPC

49154/tcp open  msrpc Microsoft Windows RPC

49155/tcp open  msrpc Microsoft Windows RPC

49157/tcp open  ncacn_http Microsoft Windows RPC over HTTP 1.0

49158/tcp open  msrpc Microsoft Windows RPC

49169/tcp open  msrpc Microsoft Windows RPC

49171/tcp open  msrpc Microsoft Windows RPC

49182/tcp open  msrpc Microsoft Windows RPC

Vulnerability exploited:

Anonymous SMB login to Replication

Decrypt cpassword from Groups.xml

Login with low priv user.

Privilege escalation:

GetUserSPN.py allows you to grab the admins kerberos hash

Decrypting the hash allows you to login with psexec as the administrator

Exploiting the host:

Nmap

Ldap, kerberos and DNS means it could be an AD box.

SMB Map

Logging in with smbclient to “replication”

Grab the groups.xml file which can contain a cpassword on 2008 systems

Cat the file to get the hash

Grep the password and pipe into gpp-decrypt

User is active.htb\SVC_TGS:GPPstillStandingStrong2k18

Login with smb with psexec does not work

Try enumerating other shares as the user

Can login and download the user.txt

Grab the admins hash using GetUserSPNs.py from impacket.

Crack it with hashcat

Admin's password is Ticketmaster1968

Once Admins password discovered login with psexec and grab the root flag