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.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
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
Which versions are affected by CVE-2023-43798?
It affects 1 product.
Products include 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.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2023-43798 being exploited?
There is no known exploitation of CVE-2023-43798 in the wild and no public exploit code.