# CVE-2023-4739: Byzoro Smart S85F Management Platform updateos.php unrestricted upload

> Attackers can upload malicious files via updateos.php to execute arbitrary code on the Byzoro Smart S85F Management Platform.

- **Severity:** Medium 6.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L`)
- **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:** 3 Sep 2023
- **Updated:** 21 Nov 2024
- **Also known as:** GHSA-3pj2-53jv-g287

## What is CVE-2023-4739?

CVE-2023-4739 is a medium-severity vulnerability in Byzoro Smart S85F Management Platform, published on 3 Sep 2023. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability, which was classified as critical, has been found in Byzoro Smart S85F Management Platform up to 20230820. Affected by this issue is some unknown functionality of the file /sysmanage/updateos.php. The manipulation of the argument 1_file_upload leads to unrestricted upload. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. The identifier of this vulnerability is VDB-238628. NOTE: The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-434 (Unrestricted Upload of File with Dangerous Type)

## Which versions are affected by CVE-2023-4739?

It affects 1 product.


Products: Byzoro Smart S85f Firmware.

## How do I fix CVE-2023-4739?

No fix has been published for CVE-2023-4739 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-4739 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-4739 exists.

## Other vulnerabilities in Byzoro Smart S85F Management Platform

- [CVE-2023-5683](https://insights.sbomify.com/CVE-2023-5683/): Byzoro Smart S85F Management Platform importconf.php os command injection (medium 6.3)
- [CVE-2023-5684](https://insights.sbomify.com/CVE-2023-5684/): Byzoro Smart S85F Management Platform importexport.php os command injection (medium 4.7)
- [CVE-2023-5959](https://insights.sbomify.com/CVE-2023-5959/): Byzoro Smart S85F Management Platform login.php password recovery (medium 4.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-4739 and fix it if it is affected.

What it is: CVE-2023-4739 is a medium-severity vulnerability in Byzoro Smart S85F Management Platform, published on 3 Sep 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-4739 exists.

Affected product: Byzoro Smart S85F Management Platform. 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-2023-4739/ (Markdown: https://insights.sbomify.com/CVE-2023-4739/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-4739
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-4739
- OSV: https://osv.dev/vulnerability/CVE-2023-4739

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From sbomify Insights: https://insights.sbomify.com/CVE-2023-4739/
Summaries are generated and may contain mistakes; the official description above is the record.