CVE-2022-41961 BigBlueButton subject to Ineffective user bans
Attackers can bypass user bans in BigBlueButton by joining meetings with alternative accounts linked to the same external ID.
- 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-2022-41961?
CVE-2022-41961 is a medium-severity vulnerability in bigbluebutton, published on 16 Dec 2022. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
BigBlueButton is an open source web conferencing system. Versions prior to 2.4-rc-6 are subject to Ineffective user bans. The attacker could register multiple users, and join the meeting with one of them. When that user is banned, they could still join the meeting with the remaining registered users from the same extId. This issue has been fixed by improving permissions such that banning a user removes all users related to their extId, including registered users that have not joined the meeting. This issue is patched in versions 2.4-rc-6 and 2.5-alpha-1. There are no workarounds.
Which versions are affected by CVE-2022-41961?
It affects 1 product.
Products include Bigbluebutton Bigbluebutton.
How do I fix CVE-2022-41961?
No fix has been published for CVE-2022-41961 yet. Limit exposure of the affected software until one is available.
Is CVE-2022-41961 being exploited?
There is no known exploitation of CVE-2022-41961 in the wild and no public exploit code.
Other vulnerabilities in bigbluebutton
Sources
Also known as GHSA-wxjp-h88g-7fqg.