# CVE-2018-13441: Null dereference in n/a

> A local attacker can cause a denial of service in Nagios Core by sending a crafted payload to the UNIX socket, triggering a NULL pointer dereference.

- **Severity:** Medium 5.5 (`CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 12 Jul 2018
- **Updated:** 5 Aug 2024
- **Also known as:** DEBIAN-CVE-2018-13441, GHSA-vcwh-ghpm-79h9

## What is CVE-2018-13441?

CVE-2018-13441 is a medium-severity vulnerability in n/a, published on 12 Jul 2018. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

qh_help in Nagios Core version 4.4.1 and earlier is prone to a NULL pointer dereference vulnerability, which allows attacker to cause a local denial-of-service condition by sending a crafted payload to the listening UNIX socket.

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2018-13441?

It affects 1 product.


Products: Nagios Nagios.

## How do I fix CVE-2018-13441?

Upgrade to a fixed version.

## Is CVE-2018-13441 being exploited?

There is no known exploitation of CVE-2018-13441 in the wild and no public exploit code.

Public exploit code:

- Nagios Core 4.4.1 - Denial of Service (exploitdb)

## Other vulnerabilities in n/a

- [CVE-2002-1959](https://insights.sbomify.com/CVE-2002-1959/): Command injection in n/a (critical 10.0)
- [CVE-2016-0726](https://insights.sbomify.com/CVE-2016-0726/): Hardcoded credentials in n/a (critical 9.8)
- [CVE-2008-7313](https://insights.sbomify.com/CVE-2008-7313/): Command injection in n/a (critical 9.8)
- [CVE-2014-5009](https://insights.sbomify.com/CVE-2014-5009/): Command injection in n/a (critical 9.8)
- [CVE-2016-9565](https://insights.sbomify.com/CVE-2016-9565/): Path traversal in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-13441 and fix it if it is affected.

What it is: CVE-2018-13441 is a medium-severity vulnerability in n/a, published on 12 Jul 2018. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2018-13441 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-2018-13441/ (Markdown: https://insights.sbomify.com/CVE-2018-13441/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-13441
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-13441
- OSV: https://osv.dev/vulnerability/CVE-2018-13441

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-13441/
Summaries are generated and may contain mistakes; the official description above is the record.