# CVE-2021-42171: Unrestricted Upload of File with Dangerous Type in Zenario CMS

> Attackers can upload malicious files to Zenario CMS to execute arbitrary code and compromise the web server.

- **Severity:** High 7.2 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 14 Mar 2022
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-rgg3-3wh7-w935

## What is CVE-2021-42171?

CVE-2021-42171 is a high-severity vulnerability in n/a, published on 14 Mar 2022. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

Zenario CMS 9.0.54156 is vulnerable to File Upload. The web server can be compromised by uploading and executing a web-shell which can run commands, browse system files, browse local resources, attack other servers, and exploit the local vulnerabilities, and so forth.

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

## Which versions are affected by CVE-2021-42171?

2 open source packages ship an affected version, including tribalsystems/zenario. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `tribalsystems/zenario` | Packagist | All versions | 9.0.55143 |
| `tribalsystems/zenario` | Packagist | All versions | 9.0.55143 |

Products: Tribalsystems Zenario.

## How do I fix CVE-2021-42171?

Upgrade tribalsystems/zenario to 9.0.55143 or later.

## Is CVE-2021-42171 being exploited?

There is no known exploitation of CVE-2021-42171 in the wild and no public exploit code.

Public exploit code:

- File upload to Remote Code Execution on Zenario CMS 9.0.54156 (github_poc): https://github.com/minhnq22/CVE-2021-42171

## Other vulnerabilities in n/a

- [CVE-2022-44136](https://insights.sbomify.com/CVE-2022-44136/): Zenario CMS is vulnerable to Remote Code Execution (RCE). (critical 9.8)
- [CVE-2021-26830](https://insights.sbomify.com/CVE-2021-26830/): SQL Injection in tribalsystems/zenario (critical 9.1)
- [CVE-2018-18420](https://insights.sbomify.com/CVE-2018-18420/): Zenario CMS vulnerable to CSRF (high 8.8)
- [CVE-2018-5960](https://insights.sbomify.com/CVE-2018-5960/): SQL Injection in Zenario 7.1-7.6 (high 8.8)
- [CVE-2022-23043](https://insights.sbomify.com/CVE-2022-23043/): File upload restriction bypass in Zenario CMS (high 7.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-42171 and fix it if it is affected.

What it is: CVE-2021-42171 is a high-severity vulnerability in n/a, published on 14 Mar 2022. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-42171 in the wild and no public exploit code.

Affected packages and fixed versions:
- tribalsystems/zenario (Packagist): affected all versions; fixed in 9.0.55143
- tribalsystems/zenario (Packagist): affected all versions; fixed in 9.0.55143

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-2021-42171/ (Markdown: https://insights.sbomify.com/CVE-2021-42171/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-42171
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-42171
- OSV: https://osv.dev/vulnerability/CVE-2021-42171

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-42171/
Summaries are generated and may contain mistakes; the official description above is the record.