# DRUPAL-CONTRIB-2023-034: The ACL module, short for Access Control Lists, is an API for other modules to create lists of users and give them access to nodes.

> An attacker with admin-type permissions can achieve remote code execution via unsafe object injection in the Drupal ACL module.

- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 23 Aug 2023

## What is DRUPAL-CONTRIB-2023-034?

DRUPAL-CONTRIB-2023-034 is an unsafe deserialization vulnerability in drupal/acl, published on 23 Aug 2023. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

The ACL module, short for Access Control Lists, is an API for other modules to create lists of users and give them access to nodes.

The module processes user input in a way that could be unsafe. This can lead to Remote Code Execution via Object Injection.

As this is an API module, it is only exploitable if a "client" module exposes the vulnerability. Details of some contributed client modules are given below. Custom modules using ACL could also expose the vulnerability.

This vulnerability is mitigated by the fact that an attacker typically needs an "admin"-type permission provided by one of ACL's client modules.

Known client modules include:

* Forum Access
* Flexi Access
* Content Access

Coordinated Security Advisories are being released for those client modules that have Security coverage.

## Which versions are affected by DRUPAL-CONTRIB-2023-034?


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `drupal/acl` | Packagist:https://packages.drupal.org/8 | All versions | 1.0.0 |

## How do I fix DRUPAL-CONTRIB-2023-034?

Apply the vendor's patch.

## Is DRUPAL-CONTRIB-2023-034 being exploited?

There is no known exploitation of DRUPAL-CONTRIB-2023-034 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for DRUPAL-CONTRIB-2023-034 and fix it if it is affected.

What it is: DRUPAL-CONTRIB-2023-034 is an unsafe deserialization vulnerability in drupal/acl, published on 23 Aug 2023. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of DRUPAL-CONTRIB-2023-034 in the wild and no public exploit code.

Affected product: drupal/acl. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/DRUPAL-CONTRIB-2023-034/ (Markdown: https://insights.sbomify.com/DRUPAL-CONTRIB-2023-034/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/DRUPAL-CONTRIB-2023-034

---
From sbomify Insights: https://insights.sbomify.com/DRUPAL-CONTRIB-2023-034/
Summaries are generated and may contain mistakes; the official description above is the record.