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Nameko Deserialization RCE (CVE-2021-41078)
cve-2021 | Level: Easy | Total Lab Runs: 0 | Premium Lab |
What is Nameko?
Nameko is a framework for building microservices in Python.
It comes with built-in support for:
RPC over AMQP
Asynchronous events (pub-sub) over AMQP
Simple HTTP GET and POST
Websocket RPC and subscriptions (experimental)
Out of the box you can build a service that can respond to RPC messages, dispatch events on certain actions, and listen to events from other services. It could also have HTTP interfaces for clients that can't speak AMQP, and a websocket interface for, say, Javascript clients.
Nameko is also extensible. You can define your own transport mechanisms and service dependencies to mix and match as desired.
Nameko strongly encourages the dependency injection pattern, which makes building and testing services clean and simple.
Nameko takes its name from the Japanese mushroom, which grows in clusters.
Reference: https://nameko.readthedocs.io/en/stable/what_is_nameko.html
What is CVE-2021-41078?
Nameko through 2.13.0 can be tricked into performing arbitrary code execution when deserializing the config file.
Reference: https://nvd.nist.gov/vuln/detail/CVE-2021-41078
Lab Environment
In this lab environment, the user is going to get access to an Ubuntu TTYD instance having a version of Nameko framework vulnerable to RCE via YAML config deserialization, identified by the CVE ID CVE-2021-41078.
Objective: Create a YAML config file to trigger the deserialization RCE vulnerability Nameko framework!
Instructions
This lab is dedicated to you! No other users are on this network :)
Once you start the lab, you will have access to a root terminal of an Ubuntu TTYD instance
The vulnerable version of the Nameko framework is preinstalled in the provided Ubuntu instance.
Do not attack the gateway located at IP address 192.X.Y.1
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- Using brute force attacks
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- Attacking the lab infrastructure
Users violating the above will be either temporarily or permanently banned from the website.
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