# CVE-2017-14251: TYPO3 Arbitrary Code Execution

> Authenticated attackers can upload malicious PHP files to execute arbitrary code on TYPO3 servers.

- **Severity:** High 8.8 (`CVSS:3.0/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:** Yes
- **Published:** 11 Sep 2017
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-fh4q-hxrw-cjqq

## What is CVE-2017-14251?

CVE-2017-14251 is a high-severity vulnerability in Typo3 Typo3, published on 11 Sep 2017. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Unrestricted File Upload vulnerability in the fileDenyPattern in sysext/core/Classes/Core/SystemEnvironmentBuilder.php in TYPO3 7.6.0 to 7.6.21 and 8.0.0 to 8.7.4 allows remote authenticated users to upload files with a .pht extension and consequently execute arbitrary PHP code.

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

## Which versions are affected by CVE-2017-14251?

4 open source packages ship an affected version, including typo3/cms. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `typo3/cms` | Packagist | From 7.6.0 | 7.6.22 |
| `typo3/cms` | Packagist | From 7.6.0 | 7.6.22 |
| `typo3/cms` | Packagist | From 8.0.0 | 8.7.5 |
| `typo3/cms` | Packagist | From 8.0.0 | 8.7.5 |

Products: Typo3 Typo3.

## How do I fix CVE-2017-14251?

Upgrade typo3/cms to a fixed version for your release line: 7.6.22 or 8.7.5.

## Is CVE-2017-14251 being exploited?

There is no known exploitation of CVE-2017-14251 in the wild and no public exploit code.

## Other vulnerabilities in Typo3 Typo3

- [CVE-2009-0258](https://insights.sbomify.com/CVE-2009-0258/): Indexed Search Engine for TYPO3 Command Execution via Metacharacter Injection (critical 10.0)
- [CVE-2011-3583](https://insights.sbomify.com/CVE-2011-3583/): Typo3 SQL injection due to faulty prepared statements (critical 9.8)
- [CVE-2011-4628](https://insights.sbomify.com/CVE-2011-4628/): Typo3 Authentication Bypass (critical 9.8)
- [CVE-2023-24814](https://insights.sbomify.com/CVE-2023-24814/): Persisted Cross-Site Scripting in Frontend Rendering in typo3 (high 8.8)
- [CVE-2021-41113](https://insights.sbomify.com/CVE-2021-41113/): Cross-Site-Request-Forgery in Backend URI Handling in Typo3 (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-14251 and fix it if it is affected.

What it is: CVE-2017-14251 is a high-severity vulnerability in Typo3 Typo3, published on 11 Sep 2017. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2017-14251 in the wild and no public exploit code.

Affected packages and fixed versions:
- typo3/cms (Packagist): affected from 7.6.0; fixed in 7.6.22
- typo3/cms (Packagist): affected from 7.6.0; fixed in 7.6.22
- typo3/cms (Packagist): affected from 8.0.0; fixed in 8.7.5
- typo3/cms (Packagist): affected from 8.0.0; fixed in 8.7.5

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-2017-14251/ (Markdown: https://insights.sbomify.com/CVE-2017-14251/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-14251
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-14251
- OSV: https://osv.dev/vulnerability/CVE-2017-14251

---
From sbomify Insights: https://insights.sbomify.com/CVE-2017-14251/
Summaries are generated and may contain mistakes; the official description above is the record.