# CVE-2011-1409: Auth bypass in n/a

> Remote attackers can bypass authentication and upload arbitrary files to the F*EX server by omitting the authentication ID.

- **Severity:** Medium 5.0 (`AV:N/AC:L/Au:N/C:N/I:P/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 24 Jun 2011
- **Updated:** 6 Aug 2024
- **Also known as:** DEBIAN-CVE-2011-1409, DSA-2259-1, GHSA-5p42-9ww9-5p77

## What is CVE-2011-1409?

CVE-2011-1409 is a medium-severity authentication bypass vulnerability in n/a, published on 24 Jun 2011. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Frams's Fast File EXchange (F*EX, aka fex) 20100208, and possibly other versions before 20110610, allows remote attackers to bypass authentication and upload arbitrary files via a request that lacks an authentication ID.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2011-1409?

It affects 1 product.


Products: Ulli Horlacher Fex.

## How do I fix CVE-2011-1409?

Upgrade to a fixed version.

## Is CVE-2011-1409 being exploited?

There is no known exploitation of CVE-2011-1409 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2014-3875](https://insights.sbomify.com/CVE-2014-3875/): Cross-site scripting in n/a (medium 6.1)
- [CVE-2014-3876](https://insights.sbomify.com/CVE-2014-3876/): Cross-site scripting in n/a (medium 4.3)
- [CVE-2014-3877](https://insights.sbomify.com/CVE-2014-3877/): Cross-site scripting in n/a (medium 4.3)
- [CVE-2012-0869](https://insights.sbomify.com/CVE-2012-0869/): Cross-site scripting in n/a (medium 4.3)
- [CVE-2012-1293](https://insights.sbomify.com/CVE-2012-1293/): Cross-site scripting in n/a (medium 4.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2011-1409 and fix it if it is affected.

What it is: CVE-2011-1409 is a medium-severity authentication bypass vulnerability in n/a, published on 24 Jun 2011. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2011-1409 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-2011-1409/ (Markdown: https://insights.sbomify.com/CVE-2011-1409/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2011-1409
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2011-1409
- OSV: https://osv.dev/vulnerability/CVE-2011-1409

---
From sbomify Insights: https://insights.sbomify.com/CVE-2011-1409/
Summaries are generated and may contain mistakes; the official description above is the record.