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Budibase affected by VM2 Constructor Escape Vulnerability

Critical severity GitHub Reviewed Published Mar 1, 2024 in Budibase/budibase

Package

npm @budibase/server (npm)

Affected versions

< 2.20.0

Patched versions

2.20.0

Description

Impact

Previously, budibase used a library called vm2 for code execution inside the Budibase builder and apps, such as the UI below for configuring bindings in the design section.

Screenshot 2024-03-01 at 13 50 16

Due to a vulnerability in vm2, any environment that executed the code server side (automations and column formulas) was susceptible to this vulnerability, allowing users to escape the sandbox provided by vm2, and to expose server side variables such as process.env. It's recommended by the authors of vm2 themselves that you should move to another solution for remote JS execution due to this vulnerability.

Patches

We moved our entire JS sandbox infrastructure over to isolated-vm, a much more secure and recommended library for remote code execution in 2.20.0. This also comes with a performance benefit in the way we cache and execute your JS server side. The budibase cloud platform has been patched already and is not running vm2, but self host users will need to manage the updates by themselves.

If you are a self hosted user, you can take the following steps to reproduce the exploit and to verify if your installation is currently affected.

Create a new formula column on one of your tables in the data section with the following configuration.
Screenshot 2024-03-01 at 14 04 28

Add the following JS function to the formula and save.
Screenshot 2024-03-01 at 14 05 19

If your installation is vulnerable, when the formula evaluates you will be able to see the printed process.env in your new formula field. If not, your installation is not affected.

Workarounds

There is no workaround at this time for any budibase app that uses JS. You must fully migrate post version 2.20.0 to patch the vulnerability.

References

References

@shogunpurple shogunpurple published to Budibase/budibase Mar 1, 2024
Published to the GitHub Advisory Database Mar 1, 2024
Reviewed Mar 1, 2024

Severity

Critical

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CVE ID

No known CVE

GHSA ID

GHSA-4g2x-vq5p-5vj6

Source code

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