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SaltStack Salt API RCE (CVE-2021-25281)
cve-2021 | Level: Easy | Total Lab Runs: 0 | Premium Lab |
What is SaltStack Salt?
Built on Python, Salt uses simple and human-readable YAML combined with event-driven automation to deploy and configure complex IT systems. In addition to leveling-up vRealize Automation SaltStack Config, Salt can be found under the hood of products from Juniper, Cisco, Cloudflare, Nutanix, SUSE, and Tieto, to name a few.
Reference: https://github.com/saltstack/salt
What are CVE-2021-25281 and CVE-2021-25282?
An issue was discovered in through SaltStack Salt before 3002.5. salt-api does not honor eauth credentials for the wheel_async client. Thus, an attacker can remotely run any wheel modules on the master.
This vulnerability was assigned a base score rating of 9.8 (critical)!
Reference: https://nvd.nist.gov/vuln/detail/CVE-2021-25281
An issue was discovered in through SaltStack Salt before 3002.5. The salt.wheel.pillar_roots.write method is vulnerable to directory traversal.
This vulnerability was assigned a base score rating of 9.1 (critical)!
Reference: https://nvd.nist.gov/vuln/detail/CVE-2021-25282
Lab Environment
In this lab environment, the user is going to get access to a Kali GUI instance. A SaltStack Salt API instance vulnerable to an RCE vulnerability, identified by CVEs CVE-2021-25281 and CVE-2021-25282, is running on the target server. It can be accessed using the tools installed on Kali at https://demo.ine.local:8000.
Objective: Leverage the vulnerable SaltStack Salt API to exploit the unauthenticated RCE vulnerability, get command execution on the target server and retrieve the flag.
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 a Kali instance
Your Kali has an interface with IP address 192.X.Y.Z. Run "ip addr" to know the values of X and Y.
The target server should be located at the IP address 192.X.Y.3.
Do not attack the gateway located at IP address 192.X.Y.1
| Verify: | ||
|---|---|---|
| 1. | Flag present on the target server |
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The following activities are strictly prohibited on this website unless otherwise explicitly stated as allowed in the mission statement:
- Using automated scanners
- Using brute force attacks
- Denial of Service attacks
- Attacking other student machines in challenges where you might achieve a shell on the vulnerable system
- Attacking the lab infrastructure
Users violating the above will be either temporarily or permanently banned from the website.
If you are unsure about an activity, then please contact support to confirm that it is allowed on our website.
Technical Support for this Lab:
There is a reason we provide unlimited lab time: you can take as much time as you need to solve a lab. However, we realize that sometimes hints might be necessary to keep you motivated!
We currently provide technical support limited to:
- Giving hints for a lab exercise
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- A lab exercise fails to load or has errors in it
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