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Fencer Intel
critical 9.8

GHSA-4g2x-vq5p-5vj6 json

Budibase affected by VM2 Constructor Escape Vulnerability

published 2y ago modified 2y ago

cvss
9.8
version 3.1, GitHub
cisa kev
Not listed
not in CISA's catalog
epss
—
no score, EPSS covers CVEs only
public exploits
0
none known

Summary

### 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](https://github.com/Budibase/budibase/assets/11256663/5f049b64-cd99-48fd-a184-644cd312c82e)

Due to a [vulnerability in vm2](https://github.com/advisories/GHSA-cchq-frgv-rjh5), 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](https://github.com/Budibase/budibase/assets/11256663/0f8bc19b-9e44-4e95-ab4e-6ef6278eea34)

Add the following JS function to the formula and save. ![Screenshot 2024-03-01 at 14 05 19](https://github.com/Budibase/budibase/assets/11256663/1d0c9705-1a88-49b0-93e0-f385a04b5c25)

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 - https://github.com/advisories/GHSA-cchq-frgv-rjh5

Patch / fix

  • npm @budibase/server 2.20.0

Is GHSA-4g2x-vq5p-5vj6 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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CVSS scores

assigned by version score vector
GitHub 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
npm @budibase/server
<2.20.0
2.20.0

Classification

Weakness
  • CWE-94 Improper Control of Generation of Code

References

Sources

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