# CVE-2021-23835: Path traversal in n/a

> An attacker with admin access can exploit a local file disclosure vulnerability in flatCore to read sensitive server files via the docs_file parameter.

- **Severity:** Medium 4.9 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 15 Jan 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-32wp-rjr7-9fg7

## What is CVE-2021-23835?

CVE-2021-23835 is a medium-severity path traversal vulnerability in n/a, published on 15 Jan 2021. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

An issue was discovered in flatCore before 2.0.0 build 139. A local file disclosure vulnerability was identified in the docs_file HTTP request body parameter for the acp interface. This can be exploited with admin access rights. The affected parameter (which retrieves the contents of the specified file) was found to be accepting malicious user input without proper sanitization, thus leading to retrieval of backend server sensitive files, e.g., /etc/passwd, SQLite database files, PHP source code, etc.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2021-23835?

It affects 1 product.


Products: Flatcore Flatcore.

## How do I fix CVE-2021-23835?

No fix has been published for CVE-2021-23835 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-23835 being exploited?

There is no known exploitation of CVE-2021-23835 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2019-13961](https://insights.sbomify.com/CVE-2019-13961/): Cross-site request forgery in n/a (high 8.8)
- [CVE-2020-17452](https://insights.sbomify.com/CVE-2020-17452/): File upload in n/a (high 7.2)
- [CVE-2019-10652](https://insights.sbomify.com/CVE-2019-10652/): File upload in n/a (high 7.2)
- [CVE-2021-23837](https://insights.sbomify.com/CVE-2021-23837/): SQL injection in n/a (medium 6.5)
- [CVE-2017-9451](https://insights.sbomify.com/CVE-2017-9451/): Cross-site scripting in n/a (medium 6.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-23835 and fix it if it is affected.

What it is: CVE-2021-23835 is a medium-severity path traversal vulnerability in n/a, published on 15 Jan 2021. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-23835 in the wild and no public exploit code.

Affected product: n/a. 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-2021-23835/ (Markdown: https://insights.sbomify.com/CVE-2021-23835/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-23835
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-23835
- OSV: https://osv.dev/vulnerability/CVE-2021-23835

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-23835/
Summaries are generated and may contain mistakes; the official description above is the record.