# CVE-2020-27603: Server-side request forgery in n/a

> Attackers can exploit unsafe JODConverter settings in BigBlueButton to access external files via LibreOffice document conversions.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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:** 21 Oct 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-6495-493q-rhcr

## What is CVE-2020-27603?

CVE-2020-27603 is a high-severity server-side request forgery vulnerability in n/a, published on 21 Oct 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

BigBlueButton before 2.2.27 has an unsafe JODConverter setting in which LibreOffice document conversions can access external files.

## Which versions are affected by CVE-2020-27603?

It affects 1 product.


Products: Bigbluebutton Bigbluebutton.

## How do I fix CVE-2020-27603?

No fix has been published for CVE-2020-27603 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-27603 being exploited?

There is no known exploitation of CVE-2020-27603 in the wild and no public exploit code.

Public exploit code:

- Proof of Concept of Libreoffice file exfiltration vulnerability in Big Blue Button (github_poc): https://github.com/hannob/CVE-2020-27603-bbb-libreoffice-poc

## Other vulnerabilities in n/a

- [CVE-2020-27602](https://insights.sbomify.com/CVE-2020-27602/): Other in n/a (critical 9.8)
- [CVE-2020-27605](https://insights.sbomify.com/CVE-2020-27605/): Code injection in n/a (critical 9.8)
- [CVE-2020-12443](https://insights.sbomify.com/CVE-2020-12443/): Path traversal in n/a (critical 9.8)
- [CVE-2020-27613](https://insights.sbomify.com/CVE-2020-27613/): Hardcoded credentials in n/a (high 8.4)
- [CVE-2021-4143](https://insights.sbomify.com/CVE-2021-4143/): Cross-site Scripting (XSS) - Generic in bigbluebutton/bigbluebutton (high 8.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-27603 and fix it if it is affected.

What it is: CVE-2020-27603 is a high-severity server-side request forgery vulnerability in n/a, published on 21 Oct 2020. 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-2020-27603 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-2020-27603/ (Markdown: https://insights.sbomify.com/CVE-2020-27603/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-27603
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-27603
- OSV: https://osv.dev/vulnerability/CVE-2020-27603

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-27603/
Summaries are generated and may contain mistakes; the official description above is the record.