# CVE-2018-8735: Command injection in n/a

> Attackers can execute arbitrary commands on Nagios XI servers via OS command injection, requiring an upgrade to secure the system.

- **Severity:** High 8.8 (`CVSS:3.0/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:** 18 Apr 2018
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-44xg-hr3w-5m39

## What is CVE-2018-8735?

CVE-2018-8735 is a high-severity command injection vulnerability in Nagios Nagios Xi, published on 18 Apr 2018. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Remote command execution (RCE) vulnerability in Nagios XI 5.2.x through 5.4.x before 5.4.13 allows an attacker to execute arbitrary commands on the target system, aka OS command injection.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command)

## Which versions are affected by CVE-2018-8735?

It affects 1 product.


Products: Nagios Nagios Xi.

## How do I fix CVE-2018-8735?

No fix has been published for CVE-2018-8735 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-8735 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2018-8735 exists.

Public exploit code:

- Nagios XI Chained Remote Code Execution (metasploit)
- Nagios XI Chained Remote Code Execution (metasploit)
- Nagios XI 5.2.6 < 5.2.9 / 5.3 / 5.4 - Chained Remote Root (exploitdb)
- Nagios XI 5.2.6 < 5.2.9 / 5.3 / 5.4 - Chained Remote Root (exploitdb)
- Nagios XI 5.2.6-5.4.12 - Chained Remote Code Execution (Metasploit) (exploitdb)
- Nagios XI 5.2.6-5.4.12 - Chained Remote Code Execution (Metasploit) (exploitdb)

## Other vulnerabilities in Nagios Nagios Xi

- [CVE-2021-25296](https://insights.sbomify.com/CVE-2021-25296/): Nagios XI OS Command Injection (high 8.8, exploited in the wild)
- [CVE-2021-25297](https://insights.sbomify.com/CVE-2021-25297/): Nagios XI OS Command Injection (high 8.8, exploited in the wild)
- [CVE-2021-25298](https://insights.sbomify.com/CVE-2021-25298/): Nagios XI OS Command Injection (high 8.8, exploited in the wild)
- [CVE-2019-15949](https://insights.sbomify.com/CVE-2019-15949/): Nagios XI Remote Code Execution (high 8.8, exploited in the wild)
- [CVE-2024-24401](https://insights.sbomify.com/CVE-2024-24401/): SQL injection in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-8735 and fix it if it is affected.

What it is: CVE-2018-8735 is a high-severity command injection vulnerability in Nagios Nagios Xi, published on 18 Apr 2018. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2018-8735 exists.

Affected product: Nagios Nagios Xi. 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-2018-8735/ (Markdown: https://insights.sbomify.com/CVE-2018-8735/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-8735
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-8735
- OSV: https://osv.dev/vulnerability/CVE-2018-8735

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-8735/
Summaries are generated and may contain mistakes; the official description above is the record.