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shiro/CVE-2020-1957/README.zh-cn.md
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shiro/CVE-2020-1957/README.zh-cn.md
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# Apache Shiro 认证绕过漏洞(CVE-2020-1957)
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Apache Shiro是一款开源安全框架,提供身份验证、授权、密码学和会话管理。Shiro框架直观、易用,同时也能提供健壮的安全性。
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在Apache Shiro 1.5.2以前的版本中,在使用Spring动态控制器时,攻击者通过构造`..;`这样的跳转,可以绕过Shiro中对目录的权限限制。
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参考链接:
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- <https://github.com/apache/shiro/commit/3708d7907016bf2fa12691dff6ff0def1249b8ce#diff-98f7bc5c0391389e56531f8b3754081aL139>
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- <https://xz.aliyun.com/t/8281>
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- <https://blog.spoock.com/2020/05/09/cve-2020-1957/>
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## 环境搭建
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执行如下命令启动一个搭载Spring 2.2.2与Shiro 1.5.1的应用:
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```
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docker compose up -d
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```
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环境启动后,访问`http://your-ip:8080`即可查看首页。
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这个应用中对URL权限的配置如下:
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```java
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@Bean
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public ShiroFilterChainDefinition shiroFilterChainDefinition() {
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DefaultShiroFilterChainDefinition chainDefinition = new DefaultShiroFilterChainDefinition();
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chainDefinition.addPathDefinition("/login.html", "authc"); // need to accept POSTs from the login form
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chainDefinition.addPathDefinition("/logout", "logout");
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chainDefinition.addPathDefinition("/admin/**", "authc");
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return chainDefinition;
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}
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```
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## 漏洞复现
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直接请求管理页面`/admin/`,无法访问,将会被重定向到登录页面:
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构造恶意请求`/xxx/..;/admin/`,即可绕过权限校验,访问到管理页面:
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