CVE-2022-29236: Improper access control for pencil annotations in BigBlueButton
First published: Wed Jun 01 2022(Updated: )
BigBlueButton is an open source web conferencing system. Starting in version 2.2 and prior to versions 2.3.18 and 2.4-rc-6, an attacker can circumvent access restrictions for drawing on the whiteboard. The permission check is inadvertently skipped on the server, due to a previously introduced grace period. The attacker must be a meeting participant. The problem has been patched in versions 2.3.18 and 2.4-rc-6. There are currently no known workarounds.
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Bigbluebutton Bigbluebutton | >=2.2.0<2.3.18 | |
| 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
- https://github.com/bigbluebutton/bigbluebutton/pull/13803
- https://github.com/bigbluebutton/bigbluebutton/pull/14265
- https://github.com/bigbluebutton/bigbluebutton/releases/tag/v2.3.18
- https://github.com/bigbluebutton/bigbluebutton/releases/tag/v2.4-rc-6
- https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-p93g-r9gm-9v6r
Frequently Asked Questions
What is CVE-2022-29236?
CVE-2022-29236 is a vulnerability in BigBlueButton, an open source web conferencing system, that allows an attacker to bypass access restrictions for drawing on the whiteboard.
Which versions of BigBlueButton are affected by CVE-2022-29236?
BigBlueButton versions 2.2 up to 2.3.18 and 2.4-rc-6 are affected by CVE-2022-29236.
What is the severity of CVE-2022-29236?
The severity of CVE-2022-29236 is medium with a CVSS score of 4.3.
How can an attacker exploit CVE-2022-29236?
An attacker can exploit CVE-2022-29236 by circumventing access restrictions for drawing on the whiteboard in affected versions of BigBlueButton.
Has a fix been released for CVE-2022-29236?
Yes, a fix has been released for CVE-2022-29236. It is recommended to update to BigBlueButton version 2.3.18 or follow the provided patches in the GitHub references.
- collector/nvd-index
- agent/type
- agent/softwarecombine
- collector/mitre-cve
- source/MITRE
- agent/severity
- agent/references
- agent/remedy
- agent/title
- agent/author
- agent/last-modified-date
- agent/weakness
- agent/description
- agent/event
- agent/first-publish-date
- agent/tags
- collector/nvd-api
- source/NVD
- agent/software-canonical-lookup
- vendor/bigbluebutton
- canonical/bigbluebutton bigbluebutton
- version/bigbluebutton bigbluebutton/2.2.0
- 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