Change UniFi User Password from Command Line

  1. SSH into the UniFi server
  2. Connect to MongoDB
  3. Find user ObjectId
  4. Update user info with new Password

You will need a hash of the password to put into the database. We don’t cover that in this post. You could copy the password from a different user account or use a different UniFi instance to change the password and then check the DB to find the hash.

SSH into the UniFi Server

ssh unifiadmin@unifiserver

Connect to MongoDB

Connect to Mongo by typing in the following.

mongo -port 27117

Then select the ace database by typing

use ace

Find user ObjectId

The admins are in the admin collection/table. Use the following command to list all the users and their name, email, and password hash.

db.admin.find({ }, { name:"" , email : "", "x_shadow" : "" })

Update user info with new Password

The following looks complex. Fortunately though you should be able to copy and paste. You should only need to change the
– ObjectId to your User Id
– Password Hash to your password hash

db.admin.update({"_id" : ObjectId("223abc5489de0a93be758493")}, {$set: { "x_shadow" : "$6$nwpi7.q2$OuD9/UZGZt5cD739Dt7j8Gb1uPtfU99p0DeDSurSNBZVizieUrFVFbRufiZMgOk2IaaDZN9BVmL9yUwQ2mC8f."}});

Note: The hash above is password. Not recommended for use.

You should receive a confirmation that it succeeded. Test the new password by logging into the UniFi Controller.

For more MongoDB commands, check out this post.

Reset NextCloud admin password – Snap package

The regular command to reset the password for a NextCloud user does not work when NextCloud is installed from a snap package.

$ sudo -u www-data php /var/www/nextcloud/occ user:resetpassword admin
Could not open input file: /var/www/nextcloud/occ

The reason is that NextCloud is located in “/snap/nextcloud”

Unfortunately the occ file is not located in /snap/nextcloud/current/

However, you can run the nextcloud.occ command directly without specifying the path. Change admin to your user.

sudo nextcloud.occ user:resetpassword admin

Type in the new password twice and login.

Hashcat examples

Rule based attack

Use a wordlist and best64 rules to try and crack a wordpress hash. Using rockyou.txt as an example.

-m Specifies the hash type

hashcat -m 400 wordpress.hash -r rules/best64.rule wordlist/rockyou.txt

wordpress.hash is a text file that contains the password hash. You can list multiple hashes in the file

Example contents of file

bob@localhost:~$ cat wordpress.hash 

Brute force

Attempt every 8 numeric combination for a WPA2 key.

hashcat -m 2500 -a3 capture.hccapx ?d?d?d?d?d?d?d?d

Hashcat built in Charsets

You can swap out the ?d from the above command with any of the built in character sets below.

  ? | Charset
  l | abcdefghijklmnopqrstuvwxyz
  d | 0123456789
  h | 0123456789abcdef
  H | 0123456789ABCDEF
  s |  !"#$%&'()*+,-./:;<=>?@[\]^_`{|}~
  a | ?l?u?d?s
  b | 0x00 - 0xff

More information
Rule based attacks are recommended

Crack LUKS volume with Hashcat

Install hashcat

apt install hashcat

Find LUKS Volume

bob@localhost:~/$ dmesg
[ 1057.776074] sd 0:0:0:0: [sda] Write Protect is off
[ 1057.776074] sd 0:0:0:0: [sda] Mode Sense: 43 00 00 00
[ 1057.776593] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[ 1057.780234]  sda: sda1
[ 1057.783346] sd 0:0:0:0: [sda] Attached SCSI removable disk

From the above we see that the drive we just pluGged into the system is “sda” so our path and partition is “/dev/sda1”

Run hashcat

The following command will run hashcat against “/dev/sda1”, change if the encrypted partition is different. Mode is to brute force every 8 numeric character combination. Refer to the following link to learn more about mask attacks.

Note: You should be able to dump the header and work off of that as well.

sudo hashcat -a 3 -m 14600 /dev/sda1 ?d?d?d?d?d?d?d?d

Generate Password list using Crunch

Install crunch and then generate a word list with the following command. The 8 8 tells crunch to generate combinations that have a minimum and maximum length of 8. All the numbers from 1-0 tells crunch to use these characters, -o writes to output file.

Change options if desired.

crunch 8 8 1234567890 -o 8numberchars.lst

Further reading.

Hydra – SSH Example

Hydra is a network login cracker. You’ll need a password list and username(s) to get started.

Install Hydra

sudo apt-get install -y hydra 

Launch against device
Change the IP address to the target IP
Change ubnt to target Username
Change password.lst to your password list file

SSH Example

hydra -l ubnt -P password.lst ssh

Run hydra -h to get the full help.

Alfred@localhost:~$ hydra -h
Hydra v8.6 (c) 2017 by van Hauser/THC - Please do not use in military or secret service organizations, or for illegal purposes.
 Syntax: hydra [[[-l LOGIN|-L FILE] [-p PASS|-P FILE]] | [-C FILE]] [-e nsr] [-o FILE] [-t TASKS] [-M FILE [-T TASKS]] [-w TIME] [-W TIME] [-f] [-s PORT] [-x MIN:MAX:CHARSET] [-c TIME] [-ISOuvVd46] [service://server[:PORT][/OPT]]
   -R        restore a previous aborted/crashed session
   -I        ignore an existing restore file (don't wait 10 seconds)
   -S        perform an SSL connect
   -s PORT   if the service is on a different default port, define it here
   -l LOGIN or -L FILE  login with LOGIN name, or load several logins from FILE
   -p PASS  or -P FILE  try password PASS, or load several passwords from FILE
   -x MIN:MAX:CHARSET  password bruteforce generation, type "-x -h" to get help
   -y        disable use of symbols in bruteforce, see above
   -e nsr    try "n" null password, "s" login as pass and/or "r" reversed login
   -u        loop around users, not passwords (effective! implied with -x)
   -C FILE   colon separated "login:pass" format, instead of -L/-P options
   -M FILE   list of servers to attack, one entry per line, ':' to specify port
   -o FILE   write found login/password pairs to FILE instead of stdout
   -b FORMAT specify the format for the -o FILE: text(default), json, jsonv1
   -f / -F   exit when a login/pass pair is found (-M: -f per host, -F global)
   -t TASKS  run TASKS number of connects in parallel per target (default: 16)
   -T TASKS  run TASKS connects in parallel overall (for -M, default: 64)
   -w / -W TIME  wait time for a response (32) / between connects per thread (0)
   -c TIME   wait time per login attempt over all threads (enforces -t 1)
   -4 / -6   use IPv4 (default) / IPv6 addresses (put always in [] also in -M)
   -v / -V / -d  verbose mode / show login+pass for each attempt / debug mode 
   -O        use old SSL v2 and v3
   -q        do not print messages about connection errors
   -U        service module usage details
   -h        more command line options (COMPLETE HELP)
   server    the target: DNS, IP or (this OR the -M option)
   service   the service to crack (see below for supported protocols)
   OPT       some service modules support additional input (-U for module help)
 Supported services: adam6500 asterisk cisco cisco-enable cvs firebird ftp ftps http[s]-{head|get|post} http[s]-{get|post}-form http-proxy http-proxy-urlenum icq imap[s] irc ldap2[s] ldap3[-{cram|digest}md5][s] mssql mysql nntp oracle-listener oracle-sid pcanywhere pcnfs pop3[s] postgres radmin2 rdp redis rexec rlogin rpcap rsh rtsp s7-300 sip smb smtp[s] smtp-enum snmp socks5 ssh sshkey svn teamspeak telnet[s] vmauthd vnc xmpp
 Hydra is a tool to guess/crack valid login/password pairs. Licensed under AGPL
 v3.0. The newest version is always available at
 Don't use in military or secret service organizations, or for illegal purposes.
 These services were not compiled in: afp ncp oracle sapr3.
 Use HYDRA_PROXY_HTTP or HYDRA_PROXY environment variables for a proxy setup.
 E.g. % export HYDRA_PROXY=socks5://l:p@ (or: socks4:// connect://)
      % export HYDRA_PROXY=connect_and_socks_proxylist.txt  (up to 64 entries)
      % export HYDRA_PROXY_HTTP=http://login:pass@proxy:8080
      % export HYDRA_PROXY_HTTP=proxylist.txt  (up to 64 entries)
   hydra -l user -P passlist.txt
   hydra -L userlist.txt -p defaultpw imap://
   hydra -C defaults.txt -6 pop3s://[2001:db8::1]:143/TLS:DIGEST-MD5
   hydra -l admin -p password ftp://[]/
   hydra -L logins.txt -P pws.txt -M targets.txt ssh

How To Reset root Password on CentOS VM – XenServer

Basic steps are as follows.

  1. Shutdown VM
  2. From XenCenter, insert the CentOS iso into the VM’s Virtual DVD drive.
  3. Boot the CentOS VM in recovery mode.  If you need help with that check this post out.
  4. On the grub menu, select recover OS Installation.
  5. Run through the recovery and mount the VM’s disk where CentOS is installed
  6. You should now be able to drop to a prompt and chroot /sysimage
  7. Change the root password with passwd
  8. Shutdown the VM
  9. Eject the CentOS iso
  10. Boot up the VM and login with the new password

OpenVas set password for user

After installing OpenVAS you may need to setup a user. Running the following command will create the user admin and will print the password for the user below.

openvasmd --create-user admin

Example output.

User created with password 'b4539967-c521-fe41-d255-aeb53e735h9a'.

If needed you can delete a user with the following command

openvasmd --delete-user=USERNAME