CVE-2023-42803 BigBlueButton Unrestricted File Upload vulnerability

Medium 5.3 Published 30 Oct 2023 Updated 6 Sep 2024

Attackers can upload malicious files via the insertDocument API due to missing extension validation, potentially leading to code execution.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2023-42803?

CVE-2023-42803 is a medium-severity vulnerability in bigbluebutton, published on 30 Oct 2023. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

BigBlueButton is an open-source virtual classroom. BigBlueButton prior to version 2.6.0-beta.2 is vulnerable to unrestricted file upload, where the insertDocument API call does not validate the given file extension before saving the file, and does not remove it in case of validation failures. BigBlueButton 2.6.0-beta.2 contains a patch. There are no known workarounds.

Weakness: CWE-434

Which versions are affected by CVE-2023-42803?

It affects 1 product.

Products include Bigbluebutton Bigbluebutton.

How do I fix CVE-2023-42803?

No fix has been published for CVE-2023-42803 yet. Limit exposure of the affected software until one is available.

Is CVE-2023-42803 being exploited?

There is no known exploitation of CVE-2023-42803 in the wild and no public exploit code.

Sources

Also known as GHSA-w98f-6x8w-xhjc.