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h2database/CVE-2021-42392/README.md

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+# H2 Database Web Console Pre-Auth JNDI Injection RCE (CVE-2021-42392)
+
+[中文版本(Chinese version)](README.zh-cn.md)
+
+H2 database is a fast, open-source Java-based relational database management system (RDBMS) that can be used in both embedded (within a Java application) and client-server modes.
+
+Springboot with h2 database comes with a web management page if you set the following options:
+
+```
+spring.h2.console.enabled=true
+spring.h2.console.settings.web-allow-others=true
+```
+
+H2 Database version before 1.4.206 with this management page supports to use JNDI to load the JDBC driver, which can lead to remote code execution via JNDI injection.
+
+References:
+
+- <https://jfrog.com/blog/the-jndi-strikes-back-unauthenticated-rce-in-h2-database-console/>
+- <https://mp.weixin.qq.com/s?__biz=MzI2NTM1MjQ3OA==&mid=2247483658&idx=1&sn=584710da0fbe56c1246755147bcec48e>
+- <https://github.com/h2database/h2database/commit/b24aa46f48904ce64443f8f4353d70a2eed09037>
+- <https://github.com/h2database/h2database/security/advisories/GHSA-h376-j262-vhq6>
+
+## Setup
+
+Start a spring-boot with h2 database 2.0.204:
+
+```
+docker compose up -d
+```
+
+After started the container, the spring-boot is listening on `http://your-ip:8080`, the management page is `http://your-ip:8080/h2-console/` by default.
+
+## Vulnerability Reproduce
+
+Before reproducing this issue, we can confirm that the payload in [CVE-2018-10054](../CVE-2018-10054) is not exploitable because in-memory database is disabled after 1.4.197:
+
+![](1.png)
+
+The H2 console after version 1.4.197 added a new [`-ifNotExists` option](https://github.com/h2database/h2database/pull/1726) that disable remote database creation by default. So you are unable to authenticate the H2 console without a known database file, such as in-memory database.
+
+However, the H2 console still supports [JNDI injection](https://www.veracode.com/blog/research/exploiting-jndi-injections-java), which can be used to execute arbitrary code.
+
+Simply use the [Java-Chains](https://github.com/vulhub/java-chains) to exploit the vulnerability.
+
+First, generate the malicious JNDI URL by using the `JNDI/JNDIResourceRefPayload` module (don't forget to input the command you want to execute):
+
+![](2.png)
+
+Then, go to the H2 Web console login page, enter `javax.naming.InitialContext` as the Driver class, and the JNDI URL generated by Java-Chains as the JDBC URL.
+
+![](3.png)
+
+As you can see, the command has been executed successfully:
+
+![](4.png)

h2database/CVE-2021-42392/README.zh-cn.md

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+# H2 Database Web 控制台未授权JNDI注入RCE漏洞（CVE-2021-42392）
+
+H2 Database是一个快速、开源的基于Java的关系型数据库管理系统（RDBMS），可用于嵌入式（集成在Java应用中）和客户端-服务器模式。
+
+当Spring Boot集成H2 Database时，如果设置如下选项，将会启用Web管理页面：
+
+```
+spring.h2.console.enabled=true
+spring.h2.console.settings.web-allow-others=true
+```
+
+1.4.206之前版本的H2 Database管理页面支持通过JNDI加载JDBC驱动，攻击者可以利用JNDI注入实现远程代码执行。
+
+参考链接：
+
+- <https://jfrog.com/blog/the-jndi-strikes-back-unauthenticated-rce-in-h2-database-console/>
+- <https://mp.weixin.qq.com/s?__biz=MzI2NTM1MjQ3OA==&mid=2247483658&idx=1&sn=584710da0fbe56c1246755147bcec48e>
+- <https://github.com/h2database/h2database/commit/b24aa46f48904ce64443f8f4353d70a2eed09037>
+- <https://github.com/h2database/h2database/security/advisories/GHSA-h376-j262-vhq6>
+
+## 环境搭建
+
+执行如下命令启动一个集成了H2 Database 2.0.204版本的Spring Boot：
+
+```
+docker compose up -d
+```
+
+容器启动后，Spring Boot服务监听在`http://your-ip:8080`，H2管理页面默认地址为`http://your-ip:8080/h2-console/`。
+
+## 漏洞复现
+
+在复现本漏洞前，可以先确认[CVE-2018-10054](../CVE-2018-10054)中的payload已无法利用，因为1.4.197之后内存数据库被禁用：
+
+![](1.png)
+
+1.4.197之后的H2控制台新增了[`-ifNotExists`选项](https://github.com/h2database/h2database/pull/1726)，默认禁用远程数据库创建。因此，攻击者无法通过未知数据库文件（如内存数据库）进入H2控制台。
+
+但H2控制台依然支持[JNDI注入](https://www.veracode.com/blog/research/exploiting-jndi-injections-java)，可用于执行任意代码。
+
+我们可以直接使用[Java-Chains](https://github.com/vulhub/java-chains)来利用该漏洞。首先，使用`JNDI/JNDIResourceRefPayload`模块生成恶意JNDI URL（记得填写你想执行的命令）：
+
+![](2.png)
+
+然后，访问H2 Web控制台登录页，将Driver class填写为`javax.naming.InitialContext`，JDBC URL填写为Java-Chains生成的JNDI URL：
+
+![](3.png)
+
+如图所示，命令已被成功执行：
+
+![](4.png)

h2database/CVE-2021-42392/docker-compose.yml

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+services:
+  web:
+    image: vulhub/spring-with-h2database:2.0.204
+    ports:
+      - "8080:8080"
+      - "5005:5005"