# CVE-2020-28900: Code injection in n/a

> Attackers can execute arbitrary code as root by supplying a malicious update package to the upgrade script in Nagios Fusion and XI.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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:** No
- **Published:** 24 May 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-j8w7-pmfx-jm24

## What is CVE-2020-28900?

CVE-2020-28900 is a critical code injection vulnerability in Nagios Nagios Xi, published on 24 May 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Insufficient Verification of Data Authenticity in Nagios Fusion 4.1.8 and earlier and Nagios XI 5.7.5 and earlier allows for Escalation of Privileges or Code Execution as root via vectors related to an untrusted update package to upgrade_to_latest.sh.

Weakness: CWE-345 (Insufficient Verification of Data Authenticity)

## Which versions are affected by CVE-2020-28900?

It affects 2 products.


Products: Nagios Fusion, Nagios Nagios Xi.

## How do I fix CVE-2020-28900?

No fix has been published for CVE-2020-28900 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-28900 being exploited?

There is no known exploitation of CVE-2020-28900 in the wild and no public exploit code.

## Other vulnerabilities in Nagios Nagios Xi

- [CVE-2020-28901](https://insights.sbomify.com/CVE-2020-28901/): Command injection in n/a (critical 9.8)
- [CVE-2020-28902](https://insights.sbomify.com/CVE-2020-28902/): Command injection in n/a (critical 9.8)
- [CVE-2020-28904](https://insights.sbomify.com/CVE-2020-28904/): Privilege escalation in n/a (critical 9.8)
- [CVE-2020-28907](https://insights.sbomify.com/CVE-2020-28907/): Security feature bypass in n/a (critical 9.8)
- [CVE-2020-28908](https://insights.sbomify.com/CVE-2020-28908/): Command injection in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-28900 and fix it if it is affected.

What it is: CVE-2020-28900 is a critical code injection vulnerability in Nagios Nagios Xi, published on 24 May 2021. 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-2020-28900 in the wild and no public exploit code.

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-2020-28900/ (Markdown: https://insights.sbomify.com/CVE-2020-28900/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-28900
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-28900
- OSV: https://osv.dev/vulnerability/CVE-2020-28900

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-28900/
Summaries are generated and may contain mistakes; the official description above is the record.