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50 lines
1.3 KiB
Markdown
50 lines
1.3 KiB
Markdown
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# Jetty WEB-INF 敏感信息泄露漏洞 CVE-2021-34429
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## 漏洞描述
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Eclipse Jetty 是一个 Java Web 服务器和 Java Servlet 容器。
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Jetty 9.4.40 修复了一个模糊路径信息泄露漏洞[CVE-2021-28164](https://github.com/vulhub/vulhub/tree/master/jetty/CVE-2021-28164)，CVE-2021-34429 是它的变种和绕过。
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有 3 种类型的有效载荷可以泄露以下内容`WEB-INF/web.xml`：
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- 基于 Unicode 的 URL 编码：`/%u002e/WEB-INF/web.xml`
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- `\0`有`.`错误：`/.%00/WEB-INF/web.xml`
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- `\0`有`..`错误：`/a/b/..%00/WEB-INF/web.xml`
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参考：
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- https://github.com/eclipse/jetty.project/security/advisories/GHSA-vjv5-gp2w-65vm
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- https://xz.aliyun.com/t/10039
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## 漏洞影响
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```
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9.4.37 ≤ Eclipse Jetty ≤ 9.4.42
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10.0.1 ≤ Eclipse Jetty ≤ 10.0.5
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11.0.1 ≤ Eclipse Jetty ≤ 11.0.5
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```
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## 环境搭建
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Vulhub执行以下命令启动 Jetty 9.4.40 服务器。
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```
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docker-compose up -d
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```
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服务器启动后，访问`http://your-ip:8080`查看示例页面。
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## 漏洞复现
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`/%u002e`unicode解码为：
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直接访问`/WEB-INF/web.xml`将会返回404页面：
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使用`/%u002e`来绕过限制下载web.xml：
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