# CVE-2023-43798: BigBlueButton Blind SSRF When Uploading Presentation (mitigation bypass)

> Attackers can bypass SSRF mitigations during presentation uploads to access internal resources or bypass security controls in BigBlueButton.

- **Severity:** Medium 5.6 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 30 Oct 2023
- **Updated:** 5 Sep 2024

## What is CVE-2023-43798?

CVE-2023-43798 is a medium-severity server-side request forgery vulnerability in bigbluebutton, published on 30 Oct 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

BigBlueButton is an open-source virtual classroom. BigBlueButton prior to versions 2.6.12 and 2.7.0-rc.1 is vulnerable to Server-Side Request Forgery (SSRF). This issue is a bypass of CVE-2023-33176. A patch in versions 2.6.12 and 2.7.0-rc.1 disabled follow redirect at `httpclient.execute` since the software no longer has to follow it when using `finalUrl`. There are no known workarounds. We recommend upgrading to a patched version of BigBlueButton.

Weakness: CWE-918 (Server-Side Request Forgery)

## Which versions are affected by CVE-2023-43798?

It affects 1 product.


Products: Bigbluebutton Bigbluebutton.

## How do I fix CVE-2023-43798?

No fix has been published for CVE-2023-43798 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-43798 being exploited?

There is no known exploitation of CVE-2023-43798 in the wild and no public exploit code.

## Other vulnerabilities in bigbluebutton

- [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-2023-43798 and fix it if it is affected.

What it is: CVE-2023-43798 is a medium-severity server-side request forgery vulnerability in bigbluebutton, published on 30 Oct 2023. 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-2023-43798 in the wild and no public exploit code.

Affected product: bigbluebutton. 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-2023-43798/ (Markdown: https://insights.sbomify.com/CVE-2023-43798/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-43798
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-43798
- OSV: https://osv.dev/vulnerability/CVE-2023-43798

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-43798/
Summaries are generated and may contain mistakes; the official description above is the record.