# CVE-2018-4056: SQL injection in coTURN

> SQL injection in coTURN admin portal allows authentication bypass and unauthorized access to the administrator interface.

- **Severity:** Critical 9.1 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 5 Feb 2019
- **Updated:** 17 Sep 2024
- **Also known as:** DEBIAN-CVE-2018-4056, GHSA-c3pf-948r-8592, UBUNTU-CVE-2018-4056

## What is CVE-2018-4056?

CVE-2018-4056 is a critical SQL injection vulnerability in Debian Debian Linux, published on 5 Feb 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An exploitable SQL injection vulnerability exists in the administrator web portal function of coTURN prior to version 4.5.0.9. A login message with a specially crafted username can cause an SQL injection, resulting in authentication bypass, which could give access to the TURN server administrator web portal. An attacker can log in via the external interface of the TURN server to trigger this vulnerability.

Weakness: CWE-89 (Improper Neutralization of Special Elements used in an SQL Command)

## Which versions are affected by CVE-2018-4056?

It affects 2 products.


Products: Coturn Project Coturn, Debian Debian Linux.

## How do I fix CVE-2018-4056?

Upgrade to a fixed version.

## Is CVE-2018-4056 being exploited?

There is no known exploitation of CVE-2018-4056 in the wild and no public exploit code.

## Other vulnerabilities in Debian Debian Linux

- [CVE-2026-43994](https://insights.sbomify.com/CVE-2026-43994/): Coturn: Stack buffer overflow in decode_oauth_token_gcm() (high 8.1)
- [CVE-2018-4058](https://insights.sbomify.com/CVE-2018-4058/): Server-side request forgery in coTURN (high 7.7)
- [CVE-2026-40613](https://insights.sbomify.com/CVE-2026-40613/): Coturn: Misaligned Memory Access in coturn STUN Attribute Parser (Remote DoS on ARM64) (high 7.5)
- [CVE-2026-53450](https://insights.sbomify.com/CVE-2026-53450/): Coturn: IPv4-mapped 127.0.0.1 bypasses default loopback peer protection (high 7.4)
- [CVE-2026-53448](https://insights.sbomify.com/CVE-2026-53448/): Coturn: SQL Injection in HTTPS Admin Panel Delete Operations (high 7.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-4056 and fix it if it is affected.

What it is: CVE-2018-4056 is a critical SQL injection vulnerability in Debian Debian Linux, published on 5 Feb 2019. 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-2018-4056 in the wild and no public exploit code.

Affected product: Debian Debian Linux. 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-2018-4056/ (Markdown: https://insights.sbomify.com/CVE-2018-4056/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-4056
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-4056
- OSV: https://osv.dev/vulnerability/CVE-2018-4056

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-4056/
Summaries are generated and may contain mistakes; the official description above is the record.