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# Spring Security OAuth2 远程命令执行漏洞CVE-2016-4977
Spring Security OAuth 是为 Spring 框架提供安全认证支持的一个模块。在其使用 whitelabel views 来处理错误时由于使用了Springs Expression Language (SpEL),攻击者在被授权的情况下可以通过构造恶意参数来远程执行命令。
参考链接:
- http://secalert.net/#CVE-2016-4977
- https://deadpool.sh/2017/RCE-Springs/
- http://blog.knownsec.com/2016/10/spring-security-oauth-rce/
## 运行环境
执行如下命令启动漏洞环境:
```
docker compose up -d
```
启动完成后,访问`http://your-ip:8080/`即可看到web页面。
## 漏洞复现
访问`http://your-ip:8080/oauth/authorize?response_type=${233*233}&client_id=acme&scope=openid&redirect_uri=http://test`。首先需要填写用户名和密码,我们这里填入`admin:admin`即可。
可见我们输入是SpEL表达式`${233*233}`已经成功执行并返回结果:
![](1.png)
然后,我们使用[poc.py](poc.py)来生成反弹shell的POC注意[Java反弹shell的限制与绕过方式](http://www.jackson-t.ca/runtime-exec-payloads.html)
![](2.png)
如上图生成了一大串SpEL语句。附带上这个SpEL语句访问成功弹回shell
![](3.png)