# CVE-2023-28657: Privilege escalation in CONPROSYS HMI System (CHS)

> A local user can gain administrative privileges in CONPROSYS HMI System, allowing them to read or modify product information.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/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:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 1 Jun 2023
- **Updated:** 9 Jan 2025
- **Also known as:** GHSA-mvj7-x43c-gpcj

## What is CVE-2023-28657?

CVE-2023-28657 is a high-severity vulnerability in Contec Co., Ltd. CONPROSYS HMI System (CHS), published on 1 Jun 2023. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Improper access control vulnerability exists in CONPROSYS HMI System (CHS) versions prior to 3.5.3. A user of the PC where the affected product is installed may gain an administrative privilege. As a result, information regarding the product may be obtained and/or altered by the user.

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2023-28657?

It affects 1 product.


Products: Contec Conprosys Hmi System.

## How do I fix CVE-2023-28657?

No fix has been published for CVE-2023-28657 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-28657 being exploited?

There is no known exploitation of CVE-2023-28657 in the wild and no public exploit code.

## Other vulnerabilities in Contec Co., Ltd. CONPROSYS HMI System (CHS)

- [CVE-2022-44456](https://insights.sbomify.com/CVE-2022-44456/): Command injection in CONPROSYS HMI System (CHS) (critical 9.8)
- [CVE-2023-28713](https://insights.sbomify.com/CVE-2023-28713/): Information disclosure in CONPROSYS HMI System (CHS) (high 8.1)
- [CVE-2023-28399](https://insights.sbomify.com/CVE-2023-28399/): Missing authorization in CONPROSYS HMI System (CHS) (high 7.8)
- [CVE-2023-22331](https://insights.sbomify.com/CVE-2023-22331/): Hardcoded credentials in CONPROSYS HMI System (CHS) (high 7.5)
- [CVE-2023-22339](https://insights.sbomify.com/CVE-2023-22339/): Missing authorization in CONPROSYS HMI System (CHS) (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-28657 and fix it if it is affected.

What it is: CVE-2023-28657 is a high-severity vulnerability in Contec Co., Ltd. CONPROSYS HMI System (CHS), published on 1 Jun 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-28657 in the wild and no public exploit code.

Affected product: Contec Co., Ltd. CONPROSYS HMI System (CHS). 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-2023-28657/ (Markdown: https://insights.sbomify.com/CVE-2023-28657/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-28657
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-28657
- OSV: https://osv.dev/vulnerability/CVE-2023-28657

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From sbomify Insights: https://insights.sbomify.com/CVE-2023-28657/
Summaries are generated and may contain mistakes; the official description above is the record.