# CVE-2018-21020: Auth bypass in n/a

> Attackers can bypass authentication in Centreon Web due to a PHP type juggling vulnerability in the authentication class.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 8 Oct 2019
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-2mc3-3j9x-hm83

## What is CVE-2018-21020?

CVE-2018-21020 is a high-severity authentication bypass vulnerability in Centreon Centreon Web, published on 8 Oct 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

In very rare cases, a PHP type juggling vulnerability in centreonAuth.class.php in Centreon Web before 2.8.27 allows attackers to bypass authentication mechanisms in place.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2018-21020?

It affects 1 product.


Products: Centreon Centreon Web.

## How do I fix CVE-2018-21020?

No fix has been published for CVE-2018-21020 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-21020 being exploited?

There is no known exploitation of CVE-2018-21020 in the wild and no public exploit code.

## Other vulnerabilities in Centreon Centreon Web

- [CVE-2024-32501](https://insights.sbomify.com/CVE-2024-32501/): SQL injection in n/a (critical 9.8)
- [CVE-2024-53923](https://insights.sbomify.com/CVE-2024-53923/): SQL injection in n/a (critical 9.1)
- [CVE-2024-55573](https://insights.sbomify.com/CVE-2024-55573/): SQL injection in n/a (critical 9.1)
- [CVE-2024-33852](https://insights.sbomify.com/CVE-2024-33852/): SQL injection in n/a (critical 9.1)
- [CVE-2024-33853](https://insights.sbomify.com/CVE-2024-33853/): SQL injection in n/a (critical 9.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-21020 and fix it if it is affected.

What it is: CVE-2018-21020 is a high-severity authentication bypass vulnerability in Centreon Centreon Web, published on 8 Oct 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-2018-21020 in the wild and no public exploit code.

Affected product: Centreon Centreon Web. 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-2018-21020/ (Markdown: https://insights.sbomify.com/CVE-2018-21020/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-21020
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-21020
- OSV: https://osv.dev/vulnerability/CVE-2018-21020

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-21020/
Summaries are generated and may contain mistakes; the official description above is the record.