# CVE-2019-3931: Command injection in Crestron AirMedia

> Remote authenticated attackers can inject arguments into curl via crafted HTTP requests to upload files and execute code as root on Crestron AirMedia devices.

- **Severity:** High 8.8 (`CVSS:3.1/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:** No
- **Published:** 30 Apr 2019
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-2pjp-h3gv-vwcc

## What is CVE-2019-3931?

CVE-2019-3931 is a high-severity command injection vulnerability in Crestron AirMedia, published on 30 Apr 2019. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Crestron AM-100 with firmware 1.6.0.2 and AM-101 with firmware 2.7.0.2 are vulnerable to argumention injection to the curl binary via crafted HTTP requests to return.cgi. A remote, authenticated attacker can use this vulnerability to upload files to the device and ultimately execute code as root.

Weakness: CWE-88 (Improper Neutralization of Argument Delimiters in a Command)

## Which versions are affected by CVE-2019-3931?

It affects 2 products.


Products: Crestron Am-100 Firmware, Crestron Am-101 Firmware.

## How do I fix CVE-2019-3931?

No fix has been published for CVE-2019-3931 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-3931 being exploited?

There is no known exploitation of CVE-2019-3931 in the wild and no public exploit code.

## Other vulnerabilities in Crestron AirMedia

- [CVE-2019-3925](https://insights.sbomify.com/CVE-2019-3925/): Command injection in Crestron AirMedia (critical 9.8)
- [CVE-2019-3926](https://insights.sbomify.com/CVE-2019-3926/): Command injection in Crestron AirMedia (critical 9.8)
- [CVE-2019-3927](https://insights.sbomify.com/CVE-2019-3927/): Auth bypass in Crestron AirMedia (critical 9.8)
- [CVE-2019-3932](https://insights.sbomify.com/CVE-2019-3932/): Hardcoded credentials in Crestron AirMedia (critical 9.8)
- [CVE-2019-3939](https://insights.sbomify.com/CVE-2019-3939/): Hardcoded credentials in Crestron AirMedia (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-3931 and fix it if it is affected.

What it is: CVE-2019-3931 is a high-severity command injection vulnerability in Crestron AirMedia, published on 30 Apr 2019. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2019-3931 in the wild and no public exploit code.

Affected product: Crestron AirMedia. 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-2019-3931/ (Markdown: https://insights.sbomify.com/CVE-2019-3931/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-3931
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-3931
- OSV: https://osv.dev/vulnerability/CVE-2019-3931

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-3931/
Summaries are generated and may contain mistakes; the official description above is the record.