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# Jetty WEB-INF 敏感信息泄露漏洞CVE-2021-34429
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在9.4.40后修复了因为`%2e`导致的敏感信息泄露漏洞[CVE-2021-28164](https://github.com/vulhub/vulhub/tree/master/jetty/CVE-2021-28164),但这个修复是不完全的,通过下面三种方式可以进行绕过:
- unicode形式URL编码`/%u002e/WEB-INF/web.xml`
- `\0`组合`.`导致的绕过:`/.%00/WEB-INF/web.xml`
- `\0`组合`..`导致的绕过:`/a/b/..%00/WEB-INF/web.xml`
影响版本9.4.37-9.4.42, 10.0.1-10.0.5, 11.0.1-11.0.5
参考链接:
- https://github.com/eclipse/jetty.project/security/advisories/GHSA-vjv5-gp2w-65vm
- https://xz.aliyun.com/t/10039
## 漏洞环境
执行如下命令启动一个Jetty 9.4.40
```
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`/%u002e/WEB-INF/web.xml`来绕过限制下载web.xml
![](2.png)