# CVE-2023-3321: Code Execution through Writable Mosquitto Configuration File

> Low-privileged users can modify writable configuration files in ABB zenon, enabling attackers to execute arbitrary code on installed hosts.

- **Severity:** High 7.0 (`CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 24 Jul 2023
- **Updated:** 24 Oct 2024
- **Also known as:** GHSA-32mx-3mqx-p47v

## What is CVE-2023-3321?

CVE-2023-3321 is a high-severity vulnerability in ABB Ability™ zenon, published on 24 Jul 2023. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A vulnerability exists by allowing low-privileged users to read and update the data in various directories used by the Zenon system. An attacker could exploit the vulnerability by using specially crafted
programs to exploit the vulnerabilities by allowing them to run on the zenon installed hosts.
This issue affects ABB Ability™ zenon: from 11 build through 11 build 106404.

Weakness: CWE-15 (External Control of System or Configuration Setting)

## Which versions are affected by CVE-2023-3321?

It affects 1 product.


Products: Abb Zenon.

## How do I fix CVE-2023-3321?

No fix has been published for CVE-2023-3321 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-3321 being exploited?

There is no known exploitation of CVE-2023-3321 in the wild and no public exploit code.

## Other vulnerabilities in ABB Ability™ zenon

- [CVE-2022-34838](https://insights.sbomify.com/CVE-2022-34838/): ABB Ability TM Operations Data Management Zenon Zenon Log Server file access control (high 8.1)
- [CVE-2023-3322](https://insights.sbomify.com/CVE-2023-3322/): Code Execution through overwriting service executable in utilities directory (high 7.0)
- [CVE-2023-3324](https://insights.sbomify.com/CVE-2023-3324/): Insecure deserialization in zenon internal DLLs (medium 6.3)
- [CVE-2022-34837](https://insights.sbomify.com/CVE-2022-34837/): ABB Ability TM Operations Data Management Zenon Zenon Log Server file access control (medium 6.2)
- [CVE-2023-3323](https://insights.sbomify.com/CVE-2023-3323/): Code Execution through overwriting project file on zenon engineering studio system (medium 5.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-3321 and fix it if it is affected.

What it is: CVE-2023-3321 is a high-severity vulnerability in ABB Ability™ zenon, published on 24 Jul 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-3321 in the wild and no public exploit code.

Affected product: ABB Ability™ zenon. 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/CVE-2023-3321/ (Markdown: https://insights.sbomify.com/CVE-2023-3321/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-3321
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-3321
- OSV: https://osv.dev/vulnerability/CVE-2023-3321

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-3321/
Summaries are generated and may contain mistakes; the official description above is the record.