# CVE-2018-8838: Missing authorization in Yokogawa CENTUM and Exaopc

> A local attacker can exploit weak access controls in the message management function to modify data and cause denial of service.

- **Severity:** Medium 6.5 (`CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:L/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:** 17 Apr 2018
- **Updated:** 17 Sep 2024
- **Also known as:** GHSA-4cv8-c362-f6hv

## What is CVE-2018-8838?

CVE-2018-8838 is a medium-severity missing authorization vulnerability in ICS-CERT Yokogawa CENTUM and Exaopc, published on 17 Apr 2018. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A weakness in access controls in CENTUM CS 1000 all versions, CENTUM CS 3000 versions R3.09.50 and earlier, CENTUM CS 3000 Small versions R3.09.50 and earlier, CENTUM VP versions R6.03.10 and earlier, CENTUM VP Small versions R6.03.10 and earlier, CENTUM VP Basic versions R6.03.10 and earlier, Exaopc versions R3.75.00 and earlier, B/M9000 CS all versions, and B/M9000 VP versions R8.01.01 and earlier may allow a local attacker to exploit the message management function of the system. A CVSS v3 base score of 6.5 has been calculated; the CVSS vector string is (AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:H).

## Which versions are affected by CVE-2018-8838?

It affects 5 products.


Products: Yokogawa B\/M9000 Cs, Yokogawa B\/M9000 Vp, Yokogawa Centum Cs 3000, Yokogawa Centum Vp, Yokogawa Exaopc.

## How do I fix CVE-2018-8838?

No fix has been published for CVE-2018-8838 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-8838 being exploited?

There is no known exploitation of CVE-2018-8838 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-8838 and fix it if it is affected.

What it is: CVE-2018-8838 is a medium-severity missing authorization vulnerability in ICS-CERT Yokogawa CENTUM and Exaopc, published on 17 Apr 2018. 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-2018-8838 in the wild and no public exploit code.

Affected product: ICS-CERT Yokogawa CENTUM and Exaopc. 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-2018-8838/ (Markdown: https://insights.sbomify.com/CVE-2018-8838/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-8838
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-8838
- OSV: https://osv.dev/vulnerability/CVE-2018-8838

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From sbomify Insights: https://insights.sbomify.com/CVE-2018-8838/
Summaries are generated and may contain mistakes; the official description above is the record.