CVE-2022-41961: BigBlueButton subject to Ineffective user bans
First published: Fri Dec 16 2022(Updated: )
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.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Bigbluebutton Bigbluebutton | <2.4 | |
| Bigbluebutton Bigbluebutton | =2.4-alpha1 | |
| Bigbluebutton Bigbluebutton | =2.4-alpha2 | |
| Bigbluebutton Bigbluebutton | =2.4-beta1 | |
| Bigbluebutton Bigbluebutton | =2.4-beta2 | |
| Bigbluebutton Bigbluebutton | =2.4-beta3 | |
| Bigbluebutton Bigbluebutton | =2.4-beta4 | |
| Bigbluebutton Bigbluebutton | =2.4-rc1 | |
| Bigbluebutton Bigbluebutton | =2.4-rc3 | |
| Bigbluebutton Bigbluebutton | =2.4-rc4 | |
| Bigbluebutton Bigbluebutton | =2.4-rc5 |
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Reference Links
Frequently Asked Questions
What is CVE-2022-41961?
CVE-2022-41961 is a vulnerability in BigBlueButton, an open source web conferencing system, that allows an attacker to join a meeting even after being banned.
What is the severity of CVE-2022-41961?
The severity of CVE-2022-41961 is medium with a CVSS score of 4.3.
What software versions are affected by CVE-2022-41961?
Versions prior to 2.4-rc-6 of BigBlueButton are affected by CVE-2022-41961.
How can an attacker exploit CVE-2022-41961?
An attacker can register multiple users and join the meeting with one of them, even after being banned.
Is there a fix for CVE-2022-41961?
Yes, the vulnerability has been fixed in version 2.4-rc-6 of BigBlueButton.
- collector/nvd-index
- agent/weakness
- agent/type
- agent/softwarecombine
- collector/mitre-cve
- source/MITRE
- agent/references
- agent/author
- agent/last-modified-date
- agent/remedy
- agent/severity
- agent/title
- agent/first-publish-date
- agent/tags
- agent/description
- agent/event
- vendor/bigbluebutton
- canonical/bigbluebutton bigbluebutton
- version/bigbluebutton bigbluebutton/2.4-alpha1
- version/bigbluebutton bigbluebutton/2.4-alpha2
- version/bigbluebutton bigbluebutton/2.4-beta1
- version/bigbluebutton bigbluebutton/2.4-beta2
- version/bigbluebutton bigbluebutton/2.4-beta3
- version/bigbluebutton bigbluebutton/2.4-beta4
- version/bigbluebutton bigbluebutton/2.4-rc1
- version/bigbluebutton bigbluebutton/2.4-rc3
- version/bigbluebutton bigbluebutton/2.4-rc4
- version/bigbluebutton bigbluebutton/2.4-rc5