Windows - Easy - BoardLight

Created At： Updated At：
Keywords: linux

Recon

PORT   STATE SERVICE VERSION
22/tcp open  ssh     OpenSSH 8.2p1 Ubuntu 4ubuntu0.11 (Ubuntu Linux; protocol 2.0)
| ssh-hostkey: 
|   3072 06:2d:3b:85:10:59:ff:73:66:27:7f:0e:ae:03:ea:f4 (RSA)
|   256 59:03:dc:52:87:3a:35:99:34:44:74:33:78:31:35:fb (ECDSA)
|_  256 ab:13:38:e4:3e:e0:24:b4:69:38:a9:63:82:38:dd:f4 (ED25519)
80/tcp open  http    Apache httpd 2.4.41 ((Ubuntu))
|_http-title: Site doesn't have a title (text/html; charset=UTF-8).
|_http-server-header: Apache/2.4.41 (Ubuntu)
Service Info: OS: Linux; CPE: cpe:/o:linux:linux_kernel

- Nikto v2.5.0
---------------------------------------------------------------------------
+ Target IP:          10.129.231.37
+ Target Hostname:    10.129.231.37
+ Target Port:        80
+ Start Time:         2024-08-15 08:36:51 (GMT0)
---------------------------------------------------------------------------
+ Server: Apache/2.4.41 (Ubuntu)
+ /: The anti-clickjacking X-Frame-Options header is not present. See: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Frame-Options
+ /: The X-Content-Type-Options header is not set. This could allow the user agent to render the content of the site in a different fashion to the MIME type. See: https://www.netsparker.com/web-vulnerability-scanner/vulnerabilities/missing-content-type-header/
+ No CGI Directories found (use '-C all' to force check all possible dirs)
+ Apache/2.4.41 appears to be outdated (current is at least Apache/2.4.54). Apache 2.2.34 is the EOL for the 2.x branch.
+ /: Web Server returns a valid response with junk HTTP methods which may cause false positives.
+ 8102 requests: 0 error(s) and 4 item(s) reported on remote host
+ End Time:           2024-08-15 08:41:57 (GMT0) (306 seconds)
---------------------------------------------------------------------------
+ 1 host(s) tested

After stumbling for way too long, we can find board.htb domain at the bottom of the page.

Then we can do subdomain enumeration using gobuster, after adding this domain to dnsmasq.conf file.

$gobuster vhost -w /usr/share/wordlists/seclists/Discovery/DNS/n0kovo_subdomains.txt -u http://board.htb  --append-domain -t 150
===============================================================
Gobuster v3.6
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@firefart)
===============================================================
[+] Url:             http://board.htb
[+] Method:          GET
[+] Threads:         150
[+] Wordlist:        /usr/share/wordlists/seclists/Discovery/DNS/n0kovo_subdomains.txt
[+] User Agent:      gobuster/3.6
[+] Timeout:         10s
[+] Append Domain:   true
===============================================================
Starting gobuster in VHOST enumeration mode
===============================================================
Found: crm.board.htb Status: 200 [Size: 6360]

After going to the site, we can see Dolibar 17.0.0

And fortunetly there is an exploit for that.
https://github.com/nikn0laty/Exploit-for-Dolibarr-17.0.0-CVE-2023-30253

For QoL, we can get shell stablisation.

python3 -c 'import pty;pty.spawn("/bin/bash")'
export TERM=xterm
CTRL-Z
stty raw -echo; fg

User login

LinEnum.sh returns nothing of value as usualy.

After a lot of stumbling, we get

www-data@boardlight:~/html/crm.board.htb/htdocs/conf$ cat conf.php
<?php
//
// File generated by Dolibarr installer 17.0.0 on May 13, 2024
//
// Take a look at conf.php.example file for an example of conf.php file
// and explanations for all possibles parameters.
//
$dolibarr_main_url_root='http://crm.board.htb';
$dolibarr_main_document_root='/var/www/html/crm.board.htb/htdocs';
$dolibarr_main_url_root_alt='/custom';
$dolibarr_main_document_root_alt='/var/www/html/crm.board.htb/htdocs/custom';
$dolibarr_main_data_root='/var/www/html/crm.board.htb/documents';
$dolibarr_main_db_host='localhost';
$dolibarr_main_db_port='3306';
$dolibarr_main_db_name='dolibarr';
$dolibarr_main_db_prefix='llx_';
$dolibarr_main_db_user='dolibarrowner';
$dolibarr_main_db_pass='serverfun2$2023!!';
$dolibarr_main_db_type='mysqli';
$dolibarr_main_db_character_set='utf8';
$dolibarr_main_db_collation='utf8_unicode_ci';
// Authentication settings
$dolibarr_main_authentication='dolibarr';

username: larrissa
password: serverfun2$2023!!

and we get the flag in /home/larissa/user.txt

Priv Esc

Running linPEAS as larissa gives us 3 CVEs:

[+] [CVE-2022-0847] DirtyPipe

   Details: https://dirtypipe.cm4all.com/
   Exposure: probable
   Tags: [ ubuntu=(20.04|21.04) ],debian=11
   Download URL: https://haxx.in/files/dirtypipez.c

[+] [CVE-2021-3156] sudo Baron Samedit

   Details: https://www.qualys.com/2021/01/26/cve-2021-3156/baron-samedit-heap-based-overflow-sudo.txt
   Exposure: probable
   Tags: mint=19,[ ubuntu=18|20 ], debian=10
   Download URL: https://codeload.github.com/blasty/CVE-2021-3156/zip/main

[+] [CVE-2021-3156] sudo Baron Samedit 2

   Details: https://www.qualys.com/2021/01/26/cve-2021-3156/baron-samedit-heap-based-overflow-sudo.txt
   Exposure: probable
   Tags: centos=6|7|8,[ ubuntu=14|16|17|18|19|20 ], debian=9|10
   Download URL: https://codeload.github.com/worawit/CVE-2021-3156/zip/main

[+] [CVE-2021-22555] Netfilter heap out-of-bounds write

   Details: https://google.github.io/security-research/pocs/linux/cve-2021-22555/writeup.html
   Exposure: probable
   Tags: [ ubuntu=20.04 ]{kernel:5.8.0-*}
   Download URL: https://raw.githubusercontent.com/google/security-research/master/pocs/linux/cve-2021-22555/exploit.c
   ext-url: https://raw.githubusercontent.com/bcoles/kernel-exploits/master/CVE-2021-22555/exploit.c
   Comments: ip_tables kernel module must be loaded
                      ╔════════════════════════════════════╗
══════════════════════╣ Files with Interesting Permissions ╠══════════════════════
                      ╚════════════════════════════════════╝
╔══════════╣ SUID - Check easy privesc, exploits and write perms
╚ https://book.hacktricks.xyz/linux-hardening/privilege-escalation#sudo-and-suid
-rwsr-xr-x 1 root root 15K Jul  8  2019 /usr/lib/eject/dmcrypt-get-device
-rwsr-sr-x 1 root root 15K Apr  8 18:36 /usr/lib/xorg/Xorg.wrap
-rwsr-xr-x 1 root root 27K Jan 29  2020 /usr/lib/x86_64-linux-gnu/enlightenment/utils/enlightenment_sys (Unknown SUID binary!)
-rwsr-xr-x 1 root root 15K Jan 29  2020 /usr/lib/x86_64-linux-gnu/enlightenment/utils/enlightenment_ckpasswd (Unknown SUID binary!)
-rwsr-xr-x 1 root root 15K Jan 29  2020 /usr/lib/x86_64-linux-gnu/enlightenment/utils/enlightenment_backlight (Unknown SUID binary!)
-rwsr-xr-x 1 root root 15K Jan 29  2020 /usr/lib/x86_64-linux-gnu/enlightenment/modules/cpufreq/linux-gnu-x86_64-0.23.1/freqset (Unknown SUID binary!)
-rwsr-xr-- 1 root messagebus 51K Oct 25  2022 /usr/lib/dbus-1.0/dbus-daemon-launch-helper
-rwsr-xr-x 1 root root 467K Jan  2  2024 /usr/lib/openssh/ssh-keysign
-rwsr-xr-- 1 root dip 386K Jul 23  2020 /usr/sbin/pppd  --->  Apple_Mac_OSX_10.4.8(05-2007)
-rwsr-xr-x 1 root root 44K Feb  6  2024 /usr/bin/newgrp  --->  HP-UX_10.20
-rwsr-xr-x 1 root root 55K Apr  9 08:34 /usr/bin/mount  --->  Apple_Mac_OSX(Lion)_Kernel_xnu-1699.32.7_except_xnu-1699.24.8
-rwsr-xr-x 1 root root 163K Apr  4  2023 /usr/bin/sudo  --->  check_if_the_sudo_version_is_vulnerable
-rwsr-xr-x 1 root root 67K Apr  9 08:34 /usr/bin/su
-rwsr-xr-x 1 root root 84K Feb  6  2024 /usr/bin/chfn  --->  SuSE_9.3/10
-rwsr-xr-x 1 root root 39K Apr  9 08:34 /usr/bin/umount  --->  BSD/Linux(08-1996)
-rwsr-xr-x 1 root root 87K Feb  6  2024 /usr/bin/gpasswd
-rwsr-xr-x 1 root root 67K Feb  6  2024 /usr/bin/passwd  --->  Apple_Mac_OSX(03-2006)/Solaris_8/9(12-2004)/SPARC_8/9/Sun_Solaris_2.3_to_2.5.1(02-1997)
-rwsr-xr-x 1 root root 39K Mar  7  2020 /usr/bin/fusermount
-rwsr-xr-x 1 root root 52K Feb  6  2024 /usr/bin/chsh
-rwsr-xr-x 1 root root 15K Oct 27  2023 /usr/bin/vmware-user-suid-wrapper

All of the enlighten modules are suspicous. Quick github search gives us:
https://github.com/MaherAzzouzi/CVE-2022-37706-LPE-exploit

It works.